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Oxygen therapy

August 22, 2023

Oxygen therapy, also referred to as supplemental oxygen, is the use of oxygen as medical treatment.[1] Supplemental oxygen can also refer to the use of oxygen enriched air at altitude. Acute indications for therapy include hypoxemia (low blood oxygen levels), carbon monoxide toxicity and cluster headache. It may also be prophylactically given to maintain blood oxygen levels during the induction of anesthesia.[2] Oxygen therapy is often useful in chronic hypoxemia caused by conditions such as severe COPD or cystic fibrosis.[3][1] Oxygen can be delivered via nasal cannula, face mask, or endotracheal intubation at normal atmospheric pressure, or in a hyperbaric chamber.[4][5] It can also be given through bypassing the airway, such as in ECMO therapy.

Oxygen therapy
A person wearing a simple face mask
Clinical data
Other namessupplemental oxygen, enriched air
AHFS/Drugs.comFDA Professional Drug Information
Routes of
administration		inhaled
Drug classmedical gas
ATC code
Identifiers
CAS Number
  • 7782-44-7
ChemSpider
  • none
UNII
  • S88TT14065
Chemical and physical data
FormulaO2

Oxygen is required for normal cellular metabolism.[6] However, excessively high concentrations can result in oxygen toxicity, leading to lung damage and respiratory failure.[2][7] Higher oxygen concentrations can also increase the risk of airway fires, particularly while smoking.[1] Oxygen therapy can also dry out the nasal mucosa without humidification.[1] In most conditions, an oxygen saturation of 94–96% is adequate, while in those at risk of carbon dioxide retention, saturations of 88–92% are preferred.[1][8] In cases of carbon monoxide toxicity or cardiac arrest, saturations should be as high as possible.[1][8] While air is typically 21% oxygen by volume, oxygen therapy can increase O2 content of air up to 100%.[7]

The medical use of oxygen first became common around 1917, and is the most common hospital treatment in the developed world.[1][9][10][11] It is currently on the World Health Organization's List of Essential Medicines.[11] Home oxygen can be provided either by oxygen tanks or oxygen concentrator.[1]

Medical uses

 
Oxygen piping and regulator with flow meter, for oxygen therapy, mounted in an ambulance

Oxygen is widely used by hospitals, EMS, and first-aid providers in a variety of conditions and settings. A few indications frequently requiring high-flow oxygen include resuscitation, major trauma, anaphylaxis, major bleeding, shock, active convulsions, and hypothermia.[12][13]

Acute conditions

In context of acute hypoxemia, oxygen therapy should be titrated to a target level based on pulse oximetry (94–96% in most patients, or 88–92% in people with COPD).[12][8] This can be performed by increasing oxygen delivery, described as FIO2(fraction of inspired oxygen). In 2018, the British Medical Journal recommended that oxygen therapy be stopped for saturations greater than 96% and not started for saturations above 90 to 93%.[14] This may be due to an association between excessive oxygenation in the acutely ill and increased mortality.[8] Exceptions to these recommendations include carbon monoxide poisoning, cluster headaches, sickle cell crisis, and pneumothorax.[14]

Oxygen therapy has also been used as emergency treatment for decompression sickness for years.[15] Recompression in a hyperbaric chamber with 100% oxygen is the standard treatment for decompression illness.[15][16][17] The success of recompression therapy is greatest if given within four hours after resurfacing, with earlier treatment associated with a decreased number of recompression treatments required for resolution.[18] It has been suggested in literature that heliox may be a better alternative to oxygen therapy.[19]

In the context of stroke, oxygen therapy may be beneficial as long as hyperoxic environments are avoided.[20]

People receiving outpatient oxygen therapy for hypoxemia following acute illness or hospitalization should be re-assessed by a physician prior to prescription renewal to gauge the necessity of ongoing oxygen therapy.[21] If the initial hypoxemia has resolved, additional treatment may be an unnecessary use of resources.[21]

Chronic conditions

Common conditions which may require a baseline of supplementary oxygen include chronic obstructive pulmonary disease (COPD), chronic bronchitis, and emphysema. Patients may also require additional oxygen during acute exacerbations. Oxygen may also be prescribed for breathlessness, end-stage cardiac failure, respiratory failure, advanced cancer, or neurodegenerative disease in spite of relatively normal blood oxygen levels. Physiologically, it may be indicated in people with arterial oxygen partial pressure PaO
2 ≤ 55mmHg (7.3kPa) or arterial oxygen saturation SaO
2 ≤ 88%.[22][23][24]

Careful titration of oxygen therapy should be considered in patients with chronic conditions predisposing them to carbon dioxide retention (e.g., COPD, emphysema). In these instances, oxygen therapy may decrease respiratory drive, leading to accumulation of carbon dioxide (hypercapnia), acidemia, and increased mortality secondary to respiratory failure.[25] Improved outcomes have been observed with titrated oxygen treatment largely due to gradual improvement of the ventilation/perfusion ratio.[26] The risks associated with loss of respiratory drive are far outweighed by the risks of withholding emergency oxygen, so emergency administration of oxygen is never contraindicated. Transfer from the field to definitive care with titrated oxygen typically occurs long before significant reductions to the respiratory drive are observed.

Contraindications

There are certain situations in which oxygen therapy has been shown to negatively impact a person's condition.[27]

  • Oxygen therapy can exacerbate the effects of paraquat poisoning and should be withheld unless severe respiratory distress or respiratory arrest is present. Paraquat poisoning is rare, with about 200 deaths globally from 1958 to 1978.[28]
  • Oxygen therapy is not recommended for people with pulmonary fibrosis or bleomycin-associated lung damage.[29]
  • ARDS caused by acid aspiration may be exacerbated with oxygen therapy according to some animal studies.[30][31]
  • Hyperoxic environments should be avoided in cases of sepsis.[20]
     
    Pin-indexed Oxygen Regulator for portable D-Cylinder, usually carried in an ambulance's resuscitation kit

Adverse effects

In some instances, oxygen delivery can lead to particular complications in population subsets.

  • In infants with respiratory failure, administration of high levels of oxygen can sometimes promote overgrowth of new blood vessels in the eye leading to blindness. This phenomenon is known as retinopathy of prematurity (ROP).
  • In rare instances, people receiving hyperbaric oxygen therapy have had seizures, which has been previously attributed to oxygen toxicity.[32][33]
  • There is some evidence that extended HBOT can accelerate development of cataracts.

Alternative medicine

Some practitioners of alternative medicine have promoted "oxygen therapy" as a cure for many human ailments including AIDS, Alzheimer's disease and cancer. According to the American Cancer Society, "available scientific evidence does not support claims that putting oxygen-releasing chemicals into a person's body is effective in treating cancer", and some of these treatments can be dangerous.[34]

Physiologic Effects

Oxygen supplementation has a variety of physiologic effects on the human body. Whether or not these effects are adverse to a patient is dependent upon clinical context. Cases in which an excess amount of oxygen is available to organs is known as hyperoxia.[35] While the following effects may observed with noninvasive high-dose oxygen therapy (i.e., not ECMO), delivery of oxygen at higher pressures is associated with exacerbation of the following associated effects.

Absorption atelectasis

It has been hypothesized that oxygen therapy may promote accelerated development of atelectasis (partial or complete lung collapse), as well as denitrogenation of gas cavities (e.g., pneumothorax, pneumocephalus).[36][37] This concept is based on the idea that oxygen is more quickly absorbed compared to nitrogen within the body, leading oxygen-rich areas that are poorly ventilated to be rapidly absorbed, leading to atelectasis.[36] It is thought that higher fractions of inhaled oxygen (FIO2) are associated with increasing rates of atelectasis in the clinical scenario.[38] In clinically healthy adults, it is believed that absorption atelectasis typically does not have any significant implications when managed properly.[39]

Airway inflammation

In regard to the airway, both tracheobronchitis and mucositis have been observed with high levels of oxygen delivery (typically >40% O2).[40] Within the lungs, these elevated concentrations of oxygen have been associated with increased alveolar toxicity (coined the Lorrain-Smith effect).[35] Mucosal damage is observed to increase with elevated atmospheric pressure and oxygen concentrations, which may result in the development of ARDS and possibly death.[41][42]

Central nervous system effects

Decreased cerebral blood flow and intracranial pressure (ICP) have been reported in hyperoxic conditions, with mixed results regarding impact on cognition.[43][44][45][46] Hyperoxia as also been associated with seizures, cataract formation, and reversible myopia.[47]

Hypercapnea

Among CO2 retainers, excess exposure to oxygen in context of the Haldane effect causes decreased binding of deoxyhemoglobin to CO2 in the blood.[48] This unloading of CO2 may contribute to the development of acid-base disorders due to the associated increase in PaCO2 (hypercapnea). Patients with underlying lung disease such as COPD may not be able to adequately clear the additional CO2 produced by this effect, worsening their condition.[49] In addition, oxygen therapy has also been shown to decrease respiratory drive, further contributing to possible hypercapnea.[37]

Immunological effects

Hyperoxic environments have been observed to decrease granulocyte rolling and diapedesis in specific circumstances in humans.[50] In regard to anaerobic infections, cases of necrotizing fasciitis have been observed to require fewer debridement operations and have improvement in regard to mortality in patients treated with hyperbaric oxygen therapy.[51] This may stem from oxygen intolerance of otherwise anaerobic microorganisms.

Oxidative Stress

Sustained exposure to oxygen may overwhelm the body's capacity to deal with oxidative stress.[52]  Rates of oxidative stress appears to be influenced by both oxygen concentration and length of exposure, with general toxicity observed to occur within hours in certain hyperoxic conditions.[53]

Reduction in erythropoiesis

Hyperoxia is observed to result in a serum reduction in erythropoietin, resulting in reduced stimulus for erythropoiesis.[54] Hyperoxia at normobaric environments does not appear to be able to halt erythropoiesis completely.[54]

Pulmonary vasodilation

Within the lungs, hypoxia is observed to be a potent pulmonary vasoconstrictor, due to inhibition of an outward potassium current and activation of inward sodium current leading to pulmonary vascular muscular contraction.[55] However, the effects of hyperoxia do not seem to have a particularly strong vasodilatory effect from the few studies that have been performed on patients with pulmonary hypertension.[56][57] As a result, an effect appears to be present but minor.[56][57]

Systemic vasoconstriction

In the systemic vasculature, oxygen serves as a vasoconstrictor, leading to mildly increased blood pressure and decreased cardiac output and heart rate. Hyperbaric conditions do not seem to have a significant impact on these overall physiologic effects.[58][46] Clinically, this may lead to increased left-to-right shunting in certain patient populations, such as those with atrial septal defect. While the mechanism of the vasoconstriction is unknown, one proposed theory is that increased reactive oxygen species from oxygen therapy accelerates the degradation of endothelial nitric oxide, a vasodilator.[59][46] These vasoconstrictive effects are thought to be the underlying mechanism helping to abort cluster headaches.[60]

Dissolved oxygen in hyperoxic conditions may make also a significant contribution to total gas transport.[61]

 
High pressure gas cylinders containing oxygen to be used at home. When in use, a regulator is connected to the cylinder valve and delivers gas at a constant low pressure through a hose to a mask that fits over a person's nose and mouth.

Storage and sources

 
A home oxygen concentrator for a person with emphysema
 
Nasal cannula
 
Non-rebreather mask

Oxygen can be separated by a number of methods (e.g., chemical reaction, fractional distillation) to enable immediate or future use. The main methods utilized for oxygen therapy include:

  1. Liquid storage – Liquid oxygen is stored in insulateded tanks at low temperature and allowed to boil (at a temperature of 90.188 K (−182.96 °C)) during use, releasing gaseous oxygen. This method is widely utilized at hospitals due to high oxygen requirements. See Vacuum Insulated Evaporator for more information on this method of storage.
  2. Compressed gas storage – Oxygen gas is compressed in a gas cylinder, which provides a convenient storage method (refrigeration not required). Large oxygen cylinders hold a volume of 6,500 litres (230 cu ft) and can last about two days at a flow rate of 2 litres per minute (LPM). A small portable M6 (B) cylinder holds 164 or 170 litres (5.8 or 6.0 cu ft) and weighs about 1.3 to 1.6 kilograms (2.9 to 3.5 lb).[62] These tanks can last 4–6 hours with a conserving regulator,[clarification needed] which adjust flow based on a person's breathing rate. Conserving regulators may not be effective for patients who breathe through their mouth.[clarification needed]
  3. Instant usage – The use of an electrically powered oxygen concentrator[63] or a chemical reaction based unit[64] can create sufficient oxygen for immediate personal use. These units (especially the electrically powered versions) are widely used for home oxygen therapy as portable personal oxygen. One particular advantage includes continuous supply without need for bulky oxygen cylinders.

Hazards and risk

Highly concentrated sources of oxygen also increase risk for rapid combustion. Oxygen itself is not flammable, but the addition of concentrated oxygen to a fire greatly increases its intensity, and can aid the combustion of materials that are relatively inert under normal conditions. Fire and explosion hazards exist when concentrated oxidants and fuels are brought together in close proximity, although an ignition event (e.g., heat or spark) is needed to trigger combustion.[65]

Concentrated oxygen will allow combustion to proceed rapidly and energetically.[65] Steel pipes and storage vessels used to store and transmit both gaseous and liquid oxygen will act as a fuel; and therefore the design and manufacture of oxygen systems requires special training to ensure that ignition sources are minimized.[65] Highly concentrated oxygen in a high-pressure environment can spontaneously ignite hydrocarbons such as oil and grease, resulting in a fire or explosion. The heat caused by rapid pressurization serves as the ignition source. For this reason, storage vessels, regulators, piping and any other equipment used with highly concentrated oxygen must be "oxygen-clean" prior to use to ensure the absence of potential fuels. This does not only apply to pure oxygen; any concentration significantly higher than atmospheric (approximately 21%) carries a potential ignition risk.

Some hospitals have instituted "no-smoking" policies which can help keep ignition sources away from medically piped oxygen. These policies do not eliminate the risk of injury among patients with portable oxygen systems, especially among smokers.[66] Other potential sources of ignition include candles, aromatherapy, medical equipment, cooking, and deliberate vandalism.

Delivery

Various devices are used for oxygen administration. In most cases, the oxygen will first pass through a pressure regulator, used to control the high pressure of oxygen delivered from a cylinder (or other source) to a lower pressure. This lower pressure is then controlled by a flowmeter (which may be preset or selectable) which controls the flow at a measured rate (e.g., litres per minute [LPM]). The typical flowmeter range for medical oxygen is between 0 and 15 LPM with some units capable of obtaining up to 25 LPM. Many wall flowmeters using a Thorpe tube design are able to be dialed to "flush" oxygen which is beneficial in emergency situations.

Low-dose oxygen

Many people only require slight increases in inhaled oxygen, rather than pure or near-pure oxygen.[67] These requirements can be met through a number of devices dependent on situation, flow requirements, and personal preference.

A nasal cannula (NC) is a thin tube with two small nozzles inserted into a person's nostrils. It can provide oxygen at low flow rates, 1–6 litres per minute (LPM), delivering an oxygen concentration of 24–40%.[68]

There are also a number of face mask options, such as the simple face mask, often used at between 5 and 10 LPM, capable of delivering oxygen concentrations between 35% and 55%.[68] This is closely related to the more controlled air-entrainment masks, also known as Venturi masks, which can accurately deliver a predetermined oxygen concentration from 24 to 50%.[68]

In some instances, a partial rebreathing mask can be used, which is based on a simple mask, but features a reservoir bag, which can provide oxygen concentrations of 40–70% at 5–15 LPM.

Demand oxygen delivery systems (DODS) or oxygen resuscitators deliver oxygen only when the person inhales or the caregiver presses a button on the mask (e.g., nonbreathing patient).[69] These systems greatly conserve oxygen compared to steady-flow masks, and are useful in emergency situations when a limited supply of oxygen is available and there is a delay in transporting the person to higher care.[69] Due to utilization of a variety of methods for oxygenation requirements performance differences arise.[70] They are very useful in CPR, as the caregiver can deliver rescue breaths composed of 100% oxygen with the press of a button. Care must be taken not to over-inflate the person's lungs, for which some systems employ safety valves. These systems may not be appropriate for people who are unconscious or in respiratory distress because of the required respiratory effort.

High flow oxygen delivery

For patients requiring high concentrations of oxygen, a number of devices are available. The most commonly utilized device is the non-rebreather mask (or reservoir mask). Non-rebreather masks draw oxygen from attached reservoir bags with one-way valves that direct exhaled air out of the mask. If flow rate is not sufficient (~10L/min), the bag may collapse on inspiration.[68] This type of mask is indicated for acute medical emergencies. The delivered FIO2 (Inhalation volumetric fraction of molecular oxygen) of this system is 60–80%, depending on oxygen flow and breathing pattern.[71][72]

Another type of device is a humidified high flow nasal cannula which enables flows exceeding a person's peak inspiratory flow demand to be delivered via nasal cannula, thus providing FIO2 of up to 100% because there is no entrainment of room air.[73] This also allows the person to continue to talk, eat, and drink while still receiving therapy.[74] This type of delivery method is associated with greater overall comfort, improved oxygenation, respiratory rates and reduced sputumstatis compared with face mask oxygen.[75][76]

In specialist applications such as aviation, tight-fitting masks can be used. These masks also have applications in anaesthesia, carbon monoxide poisoning treatment and in hyperbaric oxygen therapy.

Positive pressure delivery

Patients who are unable to breathe on their own will require positive pressure to move oxygen into their lungs for gaseous exchange to take place. Systems for delivery vary in complexity and cost, starting with a basic pocket mask adjunct which can be used to manually deliver artificial respiration with supplemental oxygen delivered through a mask port.

Many emergency medical service members, first aid personnel, and hospital staff may use a bag-valve-mask (BVM), which is a malleable bag attached to a face mask (or invasive airway such as an endotracheal tube or laryngeal mask airway), usually with a reservoir bag attached, which is manually manipulated by the healthcare professional to push oxygen (or air) into the lungs. This is the only procedure allowed for initial treatment of cyanide poisoning in the UK workplace.[77]

 
Pin-indexed Oxygen Regulator for portable D-Cylinder, usually carried in an ambulance's resuscitation kit

Automated versions of the BVM system, known as a resuscitator or pneupac can also deliver measured and timed doses of oxygen directly to people through a facemask or airway. These systems are related to the anaesthetic machines used in operations under general anaesthesia that allow a variable amount of oxygen to be delivered, along with other gases including air, nitrous oxide and inhalational anaesthetics.

Drug delivery

Oxygen and other compressed gases are used in conjunction with a nebulizer to allow delivery of medications to the upper and/or lower airways. Nebulizers use compressed gas to propel liquid medication into therapeutically sized aerosol droplets for deposition to the appropriate portion of the airway. A typical compressed gas flow rate of 8–10 L/min is used to nebulize medications, saline, sterile water, or a combination these treatments into a therapeutic aerosol for inhalation. In the clinical setting, room air (ambient mix of several gasses), molecular oxygen, and Heliox[citation needed] are the most common gases used to nebulize a bolus treatment or a continuous volume of therapeutic aerosols.

Exhalation filters for oxygen masks

Filtered oxygen masks have the ability to prevent exhaled particles from being released into the surrounding environment. These masks are normally of a closed design such that leaks are minimized and breathing of room air is controlled through a series of one-way valves. Filtration of exhaled breaths is accomplished either by placing a filter on the exhalation port or through an integral filter that is part of the mask itself. These masks first became popular in the Toronto (Canada) healthcare community during the 2003 SARS Crisis. SARS was identified as being respiratory based, and it was determined that conventional oxygen therapy devices were not designed for the containment of exhaled particles.[78][79][80] In 2003, the HiOx80 oxygen mask was released for sale. The HiOx80 mask is a closed design mask that allows a filter to be placed on the exhalation port. Several new designs have emerged in the global healthcare community for the containment and filtration of potentially infectious particles. Other designs include the ISO-O
2 oxygen mask, the Flo2Max oxygen mask, and the O-Mask.

Typical oxygen masks allow a person to breathe in a mixture of room air and therapeutic oxygen. However, as filtered oxygen masks use a closed design that minimizes or eliminates the person's contact with and ability to inhale room air, delivered oxygen concentrations in such devices have been found to be elevated, approaching 99% using adequate oxygen flows.[citation needed] Because all exhaled particles are contained within the mask, nebulized medications are also prevented from releasing into the surrounding atmosphere, decreasing the occupational exposure to healthcare staff and other people.[citation needed]

Aircraft

In the United States, most airlines restrict the devices allowed on board an aircraft. As a result, passengers are restricted in what devices they can use. Some airlines will provide cylinders for passengers with an associated fee. Other airlines allow passengers to carry on approved portable concentrators. However, the lists of approved devices varies by airline so passengers may need to check with any airline they are planning to fly on. Passengers are generally not allowed to carry on personal cylinders. In all cases, passengers need to notify the airline in advance of their equipment.

Effective May 13, 2009, the Department of Transportation and FAA ruled that a select number of portable oxygen concentrators are approved for use on all commercial flights.[81] FAA regulations require larger airplanes to carry D-cylinders of oxygen for use in case of an emergency.

Oxygen conserving devices

Since the 1980s, devices have been available which conserve stored oxygen by delivering it during the portion of the breathing cycle when it is more effectively used. This has the effect of stored oxygen lasting longer, or a smaller, and therefore lighter, portable oxygen delivery system being practicable. This class of device can also be used with portable oxygen concentrators, making them more efficient.[82]

The delivery of supplemental oxygen is most effective if it is made at a point in the breathing cycle when it will be inhaled to the alveoli, where gas transfer occurs. oxygen delivered later in the cycle will be inhaled into physiological dead space, wher it serves no useful purpose as it cannot diffuse into the blood. Oxygen delivered during stages of the breathing cycle in which it is not inhaled is also wasted.[82]

A continuous constant flow rate uses a simple regulator, but is inefficient as a high percentage of the delivered gas does not reach the alveoli, and over half is not inhaled at all. A system which accumulates free-flow oxygen during resting and exhalation stages, (reservoir cannulas) makes a larger part of the oxygen available for inhalation, and it will be selectively inhaled during the initial part of inhalation, which reaches furthest into the lungs. A similar function is provided by a mechanical demand regulator which provides gas only during inhalation, but requires some physical effort by the user, and also ventilates dead space with oxygen. A third class of system (pulse dose oxygen conserving device, or demand pulse devices) senses the start of inhalation and provides a metered bolus, which if correctly matched to requirements, will be sufficient and effectively inhaled into the alveoli.Such systems can be pneumatically or electrically controlled.[82]

Adaptive demand systems[82] A development in pulse demand delivery are devices that automatically adjust the volume of the pulsed bolus to suit the activity level of the user. This adaptive response in intended to reduce desaturation responses caused by exercise rate variation.

Pulsed delivery devices are available as stand alone modules or integrated into a system specifically designed to use compressed gas, liquid oxygen or oxygen concentrator sources. Integrated design usually allows optimisation of the system for the source type at the cost of versatility.[82]

Transtracheal oxygen catheters are inserted directly into the trachea through a small opening in the front of the neck for that purpose. The opening is directed downward, towards the bifurcation of the bronchi. Oxygen introduced through the catheter bypasses the dead spaces of the nose, pharynx and upper trachea during inhalation, and during continuous flow, will accumulate in the anatomic dead space at the end of exhalation and be available for immediate inhalation to the alveoli on the following inhalation. This reduces wastage and provides efficiency roughly three times greater than with external continuous flow. This is roughly equivalent to a reservoir cannula. Transtracheal catheters have been found to be effective during rest, exercise and sleep.[82]

Long term oxygen therapy

See also

References

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Further reading

  • Kallstrom TJ (June 2002). "AARC Clinical Practice Guideline: oxygen therapy for adults in the acute care facility--2002 revision & update". Respiratory Care. 47 (6): 717–20. PMID 12078655.
  • Cahill Lambert AE (November 2005). "Adult domiciliary oxygen therapy: a patient's perspective". The Medical Journal of Australia. 183 (9): 472–3. doi:10.5694/j.1326-5377.2005.tb07125.x. PMID 16274348.

August 22, 2023
oxygen, therapy, also, referred, supplemental, oxygen, oxygen, medical, treatment, supplemental, oxygen, also, refer, oxygen, enriched, altitude, acute, indications, therapy, include, hypoxemia, blood, oxygen, levels, carbon, monoxide, toxicity, cluster, heada. Oxygen therapy also referred to as supplemental oxygen is the use of oxygen as medical treatment 1 Supplemental oxygen can also refer to the use of oxygen enriched air at altitude Acute indications for therapy include hypoxemia low blood oxygen levels carbon monoxide toxicity and cluster headache It may also be prophylactically given to maintain blood oxygen levels during the induction of anesthesia 2 Oxygen therapy is often useful in chronic hypoxemia caused by conditions such as severe COPD or cystic fibrosis 3 1 Oxygen can be delivered via nasal cannula face mask or endotracheal intubation at normal atmospheric pressure or in a hyperbaric chamber 4 5 It can also be given through bypassing the airway such as in ECMO therapy Oxygen therapyA person wearing a simple face maskClinical dataOther namessupplemental oxygen enriched airAHFS Drugs comFDA Professional Drug InformationRoutes ofadministrationinhaledDrug classmedical gasATC codeV03AN01 WHO IdentifiersCAS Number7782 44 7ChemSpidernoneUNIIS88TT14065Chemical and physical dataFormulaO2Oxygen is required for normal cellular metabolism 6 However excessively high concentrations can result in oxygen toxicity leading to lung damage and respiratory failure 2 7 Higher oxygen concentrations can also increase the risk of airway fires particularly while smoking 1 Oxygen therapy can also dry out the nasal mucosa without humidification 1 In most conditions an oxygen saturation of 94 96 is adequate while in those at risk of carbon dioxide retention saturations of 88 92 are preferred 1 8 In cases of carbon monoxide toxicity or cardiac arrest saturations should be as high as possible 1 8 While air is typically 21 oxygen by volume oxygen therapy can increase O2 content of air up to 100 7 The medical use of oxygen first became common around 1917 and is the most common hospital treatment in the developed world 1 9 10 11 It is currently on the World Health Organization s List of Essential Medicines 11 Home oxygen can be provided either by oxygen tanks or oxygen concentrator 1 Contents 1 Medical uses 1 1 Acute conditions 1 2 Chronic conditions 1 3 Contraindications 1 4 Adverse effects 1 5 Alternative medicine 2 Physiologic Effects 2 1 Absorption atelectasis 2 2 Airway inflammation 2 3 Central nervous system effects 2 4 Hypercapnea 2 5 Immunological effects 2 6 Oxidative Stress 2 7 Reduction in erythropoiesis 2 8 Pulmonary vasodilation 2 9 Systemic vasoconstriction 3 Storage and sources 3 1 Hazards and risk 4 Delivery 4 1 Low dose oxygen 4 2 High flow oxygen delivery 4 3 Positive pressure delivery 4 4 Drug delivery 4 5 Exhalation filters for oxygen masks 4 6 Aircraft 4 7 Oxygen conserving devices 5 Long term oxygen therapy 6 See also 7 References 8 Further readingMedical uses Edit Oxygen piping and regulator with flow meter for oxygen therapy mounted in an ambulanceOxygen is widely used by hospitals EMS and first aid providers in a variety of conditions and settings A few indications frequently requiring high flow oxygen include resuscitation major trauma anaphylaxis major bleeding shock active convulsions and hypothermia 12 13 Acute conditions Edit In context of acute hypoxemia oxygen therapy should be titrated to a target level based on pulse oximetry 94 96 in most patients or 88 92 in people with COPD 12 8 This can be performed by increasing oxygen delivery described as FIO2 fraction of inspired oxygen In 2018 the British Medical Journal recommended that oxygen therapy be stopped for saturations greater than 96 and not started for saturations above 90 to 93 14 This may be due to an association between excessive oxygenation in the acutely ill and increased mortality 8 Exceptions to these recommendations include carbon monoxide poisoning cluster headaches sickle cell crisis and pneumothorax 14 Oxygen therapy has also been used as emergency treatment for decompression sickness for years 15 Recompression in a hyperbaric chamber with 100 oxygen is the standard treatment for decompression illness 15 16 17 The success of recompression therapy is greatest if given within four hours after resurfacing with earlier treatment associated with a decreased number of recompression treatments required for resolution 18 It has been suggested in literature that heliox may be a better alternative to oxygen therapy 19 In the context of stroke oxygen therapy may be beneficial as long as hyperoxic environments are avoided 20 People receiving outpatient oxygen therapy for hypoxemia following acute illness or hospitalization should be re assessed by a physician prior to prescription renewal to gauge the necessity of ongoing oxygen therapy 21 If the initial hypoxemia has resolved additional treatment may be an unnecessary use of resources 21 Chronic conditions Edit Common conditions which may require a baseline of supplementary oxygen include chronic obstructive pulmonary disease COPD chronic bronchitis and emphysema Patients may also require additional oxygen during acute exacerbations Oxygen may also be prescribed for breathlessness end stage cardiac failure respiratory failure advanced cancer or neurodegenerative disease in spite of relatively normal blood oxygen levels Physiologically it may be indicated in people with arterial oxygen partial pressure PaO2 55mmHg 7 3kPa or arterial oxygen saturation SaO2 88 22 23 24 Careful titration of oxygen therapy should be considered in patients with chronic conditions predisposing them to carbon dioxide retention e g COPD emphysema In these instances oxygen therapy may decrease respiratory drive leading to accumulation of carbon dioxide hypercapnia acidemia and increased mortality secondary to respiratory failure 25 Improved outcomes have been observed with titrated oxygen treatment largely due to gradual improvement of the ventilation perfusion ratio 26 The risks associated with loss of respiratory drive are far outweighed by the risks of withholding emergency oxygen so emergency administration of oxygen is never contraindicated Transfer from the field to definitive care with titrated oxygen typically occurs long before significant reductions to the respiratory drive are observed Contraindications Edit There are certain situations in which oxygen therapy has been shown to negatively impact a person s condition 27 Oxygen therapy can exacerbate the effects of paraquat poisoning and should be withheld unless severe respiratory distress or respiratory arrest is present Paraquat poisoning is rare with about 200 deaths globally from 1958 to 1978 28 Oxygen therapy is not recommended for people with pulmonary fibrosis or bleomycin associated lung damage 29 ARDS caused by acid aspiration may be exacerbated with oxygen therapy according to some animal studies 30 31 Hyperoxic environments should be avoided in cases of sepsis 20 Pin indexed Oxygen Regulator for portable D Cylinder usually carried in an ambulance s resuscitation kitThis section needs expansion with where possible explain why these contraindications exist that would be also be encyclopedic knowledge You can help by adding to it December 2022 Adverse effects Edit In some instances oxygen delivery can lead to particular complications in population subsets In infants with respiratory failure administration of high levels of oxygen can sometimes promote overgrowth of new blood vessels in the eye leading to blindness This phenomenon is known as retinopathy of prematurity ROP In rare instances people receiving hyperbaric oxygen therapy have had seizures which has been previously attributed to oxygen toxicity 32 33 There is some evidence that extended HBOT can accelerate development of cataracts Alternative medicine Edit Some practitioners of alternative medicine have promoted oxygen therapy as a cure for many human ailments including AIDS Alzheimer s disease and cancer According to the American Cancer Society available scientific evidence does not support claims that putting oxygen releasing chemicals into a person s body is effective in treating cancer and some of these treatments can be dangerous 34 Physiologic Effects EditOxygen supplementation has a variety of physiologic effects on the human body Whether or not these effects are adverse to a patient is dependent upon clinical context Cases in which an excess amount of oxygen is available to organs is known as hyperoxia 35 While the following effects may observed with noninvasive high dose oxygen therapy i e not ECMO delivery of oxygen at higher pressures is associated with exacerbation of the following associated effects Absorption atelectasis Edit It has been hypothesized that oxygen therapy may promote accelerated development of atelectasis partial or complete lung collapse as well as denitrogenation of gas cavities e g pneumothorax pneumocephalus 36 37 This concept is based on the idea that oxygen is more quickly absorbed compared to nitrogen within the body leading oxygen rich areas that are poorly ventilated to be rapidly absorbed leading to atelectasis 36 It is thought that higher fractions of inhaled oxygen FIO2 are associated with increasing rates of atelectasis in the clinical scenario 38 In clinically healthy adults it is believed that absorption atelectasis typically does not have any significant implications when managed properly 39 Airway inflammation Edit In regard to the airway both tracheobronchitis and mucositis have been observed with high levels of oxygen delivery typically gt 40 O2 40 Within the lungs these elevated concentrations of oxygen have been associated with increased alveolar toxicity coined the Lorrain Smith effect 35 Mucosal damage is observed to increase with elevated atmospheric pressure and oxygen concentrations which may result in the development of ARDS and possibly death 41 42 Central nervous system effects Edit Decreased cerebral blood flow and intracranial pressure ICP have been reported in hyperoxic conditions with mixed results regarding impact on cognition 43 44 45 46 Hyperoxia as also been associated with seizures cataract formation and reversible myopia 47 Hypercapnea Edit Among CO2 retainers excess exposure to oxygen in context of the Haldane effect causes decreased binding of deoxyhemoglobin to CO2 in the blood 48 This unloading of CO2 may contribute to the development of acid base disorders due to the associated increase in PaCO2 hypercapnea Patients with underlying lung disease such as COPD may not be able to adequately clear the additional CO2 produced by this effect worsening their condition 49 In addition oxygen therapy has also been shown to decrease respiratory drive further contributing to possible hypercapnea 37 Immunological effects Edit Hyperoxic environments have been observed to decrease granulocyte rolling and diapedesis in specific circumstances in humans 50 In regard to anaerobic infections cases of necrotizing fasciitis have been observed to require fewer debridement operations and have improvement in regard to mortality in patients treated with hyperbaric oxygen therapy 51 This may stem from oxygen intolerance of otherwise anaerobic microorganisms Oxidative Stress Edit Sustained exposure to oxygen may overwhelm the body s capacity to deal with oxidative stress 52 Rates of oxidative stress appears to be influenced by both oxygen concentration and length of exposure with general toxicity observed to occur within hours in certain hyperoxic conditions 53 Reduction in erythropoiesis Edit Hyperoxia is observed to result in a serum reduction in erythropoietin resulting in reduced stimulus for erythropoiesis 54 Hyperoxia at normobaric environments does not appear to be able to halt erythropoiesis completely 54 Pulmonary vasodilation Edit Within the lungs hypoxia is observed to be a potent pulmonary vasoconstrictor due to inhibition of an outward potassium current and activation of inward sodium current leading to pulmonary vascular muscular contraction 55 However the effects of hyperoxia do not seem to have a particularly strong vasodilatory effect from the few studies that have been performed on patients with pulmonary hypertension 56 57 As a result an effect appears to be present but minor 56 57 Systemic vasoconstriction Edit In the systemic vasculature oxygen serves as a vasoconstrictor leading to mildly increased blood pressure and decreased cardiac output and heart rate Hyperbaric conditions do not seem to have a significant impact on these overall physiologic effects 58 46 Clinically this may lead to increased left to right shunting in certain patient populations such as those with atrial septal defect While the mechanism of the vasoconstriction is unknown one proposed theory is that increased reactive oxygen species from oxygen therapy accelerates the degradation of endothelial nitric oxide a vasodilator 59 46 These vasoconstrictive effects are thought to be the underlying mechanism helping to abort cluster headaches 60 Dissolved oxygen in hyperoxic conditions may make also a significant contribution to total gas transport 61 High pressure gas cylinders containing oxygen to be used at home When in use a regulator is connected to the cylinder valve and delivers gas at a constant low pressure through a hose to a mask that fits over a person s nose and mouth Storage and sources Edit A home oxygen concentrator for a person with emphysema Nasal cannula Non rebreather maskOxygen can be separated by a number of methods e g chemical reaction fractional distillation to enable immediate or future use The main methods utilized for oxygen therapy include Liquid storage Liquid oxygen is stored in insulateded tanks at low temperature and allowed to boil at a temperature of 90 188 K 182 96 C during use releasing gaseous oxygen This method is widely utilized at hospitals due to high oxygen requirements See Vacuum Insulated Evaporator for more information on this method of storage Compressed gas storage Oxygen gas is compressed in a gas cylinder which provides a convenient storage method refrigeration not required Large oxygen cylinders hold a volume of 6 500 litres 230 cu ft and can last about two days at a flow rate of 2 litres per minute LPM A small portable M6 B cylinder holds 164 or 170 litres 5 8 or 6 0 cu ft and weighs about 1 3 to 1 6 kilograms 2 9 to 3 5 lb 62 These tanks can last 4 6 hours with a conserving regulator clarification needed which adjust flow based on a person s breathing rate Conserving regulators may not be effective for patients who breathe through their mouth clarification needed Instant usage The use of an electrically powered oxygen concentrator 63 or a chemical reaction based unit 64 can create sufficient oxygen for immediate personal use These units especially the electrically powered versions are widely used for home oxygen therapy as portable personal oxygen One particular advantage includes continuous supply without need for bulky oxygen cylinders Hazards and risk Edit Highly concentrated sources of oxygen also increase risk for rapid combustion Oxygen itself is not flammable but the addition of concentrated oxygen to a fire greatly increases its intensity and can aid the combustion of materials that are relatively inert under normal conditions Fire and explosion hazards exist when concentrated oxidants and fuels are brought together in close proximity although an ignition event e g heat or spark is needed to trigger combustion 65 Concentrated oxygen will allow combustion to proceed rapidly and energetically 65 Steel pipes and storage vessels used to store and transmit both gaseous and liquid oxygen will act as a fuel and therefore the design and manufacture of oxygen systems requires special training to ensure that ignition sources are minimized 65 Highly concentrated oxygen in a high pressure environment can spontaneously ignite hydrocarbons such as oil and grease resulting in a fire or explosion The heat caused by rapid pressurization serves as the ignition source For this reason storage vessels regulators piping and any other equipment used with highly concentrated oxygen must be oxygen clean prior to use to ensure the absence of potential fuels This does not only apply to pure oxygen any concentration significantly higher than atmospheric approximately 21 carries a potential ignition risk Some hospitals have instituted no smoking policies which can help keep ignition sources away from medically piped oxygen These policies do not eliminate the risk of injury among patients with portable oxygen systems especially among smokers 66 Other potential sources of ignition include candles aromatherapy medical equipment cooking and deliberate vandalism Delivery EditVarious devices are used for oxygen administration In most cases the oxygen will first pass through a pressure regulator used to control the high pressure of oxygen delivered from a cylinder or other source to a lower pressure This lower pressure is then controlled by a flowmeter which may be preset or selectable which controls the flow at a measured rate e g litres per minute LPM The typical flowmeter range for medical oxygen is between 0 and 15 LPM with some units capable of obtaining up to 25 LPM Many wall flowmeters using a Thorpe tube design are able to be dialed to flush oxygen which is beneficial in emergency situations Low dose oxygen Edit Many people only require slight increases in inhaled oxygen rather than pure or near pure oxygen 67 These requirements can be met through a number of devices dependent on situation flow requirements and personal preference A nasal cannula NC is a thin tube with two small nozzles inserted into a person s nostrils It can provide oxygen at low flow rates 1 6 litres per minute LPM delivering an oxygen concentration of 24 40 68 There are also a number of face mask options such as the simple face mask often used at between 5 and 10 LPM capable of delivering oxygen concentrations between 35 and 55 68 This is closely related to the more controlled air entrainment masks also known as Venturi masks which can accurately deliver a predetermined oxygen concentration from 24 to 50 68 In some instances a partial rebreathing mask can be used which is based on a simple mask but features a reservoir bag which can provide oxygen concentrations of 40 70 at 5 15 LPM Demand oxygen delivery systems DODS or oxygen resuscitators deliver oxygen only when the person inhales or the caregiver presses a button on the mask e g nonbreathing patient 69 These systems greatly conserve oxygen compared to steady flow masks and are useful in emergency situations when a limited supply of oxygen is available and there is a delay in transporting the person to higher care 69 Due to utilization of a variety of methods for oxygenation requirements performance differences arise 70 They are very useful in CPR as the caregiver can deliver rescue breaths composed of 100 oxygen with the press of a button Care must be taken not to over inflate the person s lungs for which some systems employ safety valves These systems may not be appropriate for people who are unconscious or in respiratory distress because of the required respiratory effort High flow oxygen delivery Edit For patients requiring high concentrations of oxygen a number of devices are available The most commonly utilized device is the non rebreather mask or reservoir mask Non rebreather masks draw oxygen from attached reservoir bags with one way valves that direct exhaled air out of the mask If flow rate is not sufficient 10L min the bag may collapse on inspiration 68 This type of mask is indicated for acute medical emergencies The delivered FIO2 Inhalation volumetric fraction of molecular oxygen of this system is 60 80 depending on oxygen flow and breathing pattern 71 72 Another type of device is a humidified high flow nasal cannula which enables flows exceeding a person s peak inspiratory flow demand to be delivered via nasal cannula thus providing FIO2 of up to 100 because there is no entrainment of room air 73 This also allows the person to continue to talk eat and drink while still receiving therapy 74 This type of delivery method is associated with greater overall comfort improved oxygenation respiratory rates and reduced sputumstatis compared with face mask oxygen 75 76 In specialist applications such as aviation tight fitting masks can be used These masks also have applications in anaesthesia carbon monoxide poisoning treatment and in hyperbaric oxygen therapy Positive pressure delivery Edit Patients who are unable to breathe on their own will require positive pressure to move oxygen into their lungs for gaseous exchange to take place Systems for delivery vary in complexity and cost starting with a basic pocket mask adjunct which can be used to manually deliver artificial respiration with supplemental oxygen delivered through a mask port Many emergency medical service members first aid personnel and hospital staff may use a bag valve mask BVM which is a malleable bag attached to a face mask or invasive airway such as an endotracheal tube or laryngeal mask airway usually with a reservoir bag attached which is manually manipulated by the healthcare professional to push oxygen or air into the lungs This is the only procedure allowed for initial treatment of cyanide poisoning in the UK workplace 77 Pin indexed Oxygen Regulator for portable D Cylinder usually carried in an ambulance s resuscitation kitAutomated versions of the BVM system known as a resuscitator or pneupac can also deliver measured and timed doses of oxygen directly to people through a facemask or airway These systems are related to the anaesthetic machines used in operations under general anaesthesia that allow a variable amount of oxygen to be delivered along with other gases including air nitrous oxide and inhalational anaesthetics Drug delivery Edit Oxygen and other compressed gases are used in conjunction with a nebulizer to allow delivery of medications to the upper and or lower airways Nebulizers use compressed gas to propel liquid medication into therapeutically sized aerosol droplets for deposition to the appropriate portion of the airway A typical compressed gas flow rate of 8 10 L min is used to nebulize medications saline sterile water or a combination these treatments into a therapeutic aerosol for inhalation In the clinical setting room air ambient mix of several gasses molecular oxygen and Heliox citation needed are the most common gases used to nebulize a bolus treatment or a continuous volume of therapeutic aerosols Exhalation filters for oxygen masks Edit Filtered oxygen masks have the ability to prevent exhaled particles from being released into the surrounding environment These masks are normally of a closed design such that leaks are minimized and breathing of room air is controlled through a series of one way valves Filtration of exhaled breaths is accomplished either by placing a filter on the exhalation port or through an integral filter that is part of the mask itself These masks first became popular in the Toronto Canada healthcare community during the 2003 SARS Crisis SARS was identified as being respiratory based and it was determined that conventional oxygen therapy devices were not designed for the containment of exhaled particles 78 79 80 In 2003 the HiOx80 oxygen mask was released for sale The HiOx80 mask is a closed design mask that allows a filter to be placed on the exhalation port Several new designs have emerged in the global healthcare community for the containment and filtration of potentially infectious particles Other designs include the ISO O2 oxygen mask the Flo2Max oxygen mask and the O Mask Typical oxygen masks allow a person to breathe in a mixture of room air and therapeutic oxygen However as filtered oxygen masks use a closed design that minimizes or eliminates the person s contact with and ability to inhale room air delivered oxygen concentrations in such devices have been found to be elevated approaching 99 using adequate oxygen flows citation needed Because all exhaled particles are contained within the mask nebulized medications are also prevented from releasing into the surrounding atmosphere decreasing the occupational exposure to healthcare staff and other people citation needed Aircraft Edit In the United States most airlines restrict the devices allowed on board an aircraft As a result passengers are restricted in what devices they can use Some airlines will provide cylinders for passengers with an associated fee Other airlines allow passengers to carry on approved portable concentrators However the lists of approved devices varies by airline so passengers may need to check with any airline they are planning to fly on Passengers are generally not allowed to carry on personal cylinders In all cases passengers need to notify the airline in advance of their equipment Effective May 13 2009 the Department of Transportation and FAA ruled that a select number of portable oxygen concentrators are approved for use on all commercial flights 81 FAA regulations require larger airplanes to carry D cylinders of oxygen for use in case of an emergency Oxygen conserving devices Edit Since the 1980s devices have been available which conserve stored oxygen by delivering it during the portion of the breathing cycle when it is more effectively used This has the effect of stored oxygen lasting longer or a smaller and therefore lighter portable oxygen delivery system being practicable This class of device can also be used with portable oxygen concentrators making them more efficient 82 The delivery of supplemental oxygen is most effective if it is made at a point in the breathing cycle when it will be inhaled to the alveoli where gas transfer occurs oxygen delivered later in the cycle will be inhaled into physiological dead space wher it serves no useful purpose as it cannot diffuse into the blood Oxygen delivered during stages of the breathing cycle in which it is not inhaled is also wasted 82 A continuous constant flow rate uses a simple regulator but is inefficient as a high percentage of the delivered gas does not reach the alveoli and over half is not inhaled at all A system which accumulates free flow oxygen during resting and exhalation stages reservoir cannulas makes a larger part of the oxygen available for inhalation and it will be selectively inhaled during the initial part of inhalation which reaches furthest into the lungs A similar function is provided by a mechanical demand regulator which provides gas only during inhalation but requires some physical effort by the user and also ventilates dead space with oxygen A third class of system pulse dose oxygen conserving device or demand pulse devices senses the start of inhalation and provides a metered bolus which if correctly matched to requirements will be sufficient and effectively inhaled into the alveoli Such systems can be pneumatically or electrically controlled 82 Adaptive demand systems 82 A development in pulse demand delivery are devices that automatically adjust the volume of the pulsed bolus to suit the activity level of the user This adaptive response in intended to reduce desaturation responses caused by exercise rate variation Pulsed delivery devices are available as stand alone modules or integrated into a system specifically designed to use compressed gas liquid oxygen or oxygen concentrator sources Integrated design usually allows optimisation of the system for the source type at the cost of versatility 82 Transtracheal oxygen catheters are inserted directly into the trachea through a small opening in the front of the neck for that purpose The opening is directed downward towards the bifurcation of the bronchi Oxygen introduced through the catheter bypasses the dead spaces of the nose pharynx and upper trachea during inhalation and during continuous flow will accumulate in the anatomic dead space at the end of exhalation and be available for immediate inhalation to the alveoli on the following inhalation This reduces wastage and provides efficiency roughly three times greater than with external continuous flow This is roughly equivalent to a reservoir cannula Transtracheal catheters have been found to be effective during rest exercise and sleep 82 Long term oxygen therapy EditThis section is empty You can help by adding to it December 2022 See also EditBreathing gas Gas used for human respiration Nebulizer Drug delivery device Mechanical ventilation Method to mechanically assist or replace spontaneous breathing Hyperbaric oxygen therapy Medical treatment at raised ambient pressurePages displaying short descriptions of redirect targets Oxygen bar Establishment that sells oxygen for on site recreational use Emergency medical services Services providing acute medical care Respiratory therapist Practitioner in cardio pulmonary medicine Oxygen tent Canopy over a patient to provide supplemental oxygen Oxygen firebreak Safety mechanism designed to extinguish a fire in a medical oxygen delivery tube Bottled oxygen climbing Equipment which allows the user to breathe at hypoxic altitudesPages displaying short descriptions of redirect targets Redento D Ferranti Early use of oxygen therapy in the U S as an effective approach to rehabilitation for COPD patients References Edit a b c d e f g h British national formulary BNF 69 69 ed British Medical Association 2015 pp 217 218 302 ISBN 9780857111562 a b World Health Organization 2009 Stuart MC Kouimtzi M Hill SR eds WHO Model Formulary 2008 World Health Organization p 20 hdl 10665 44053 ISBN 9789241547659 Jamison DT Breman JG Measham AR Alleyne G Claeson M Evans DB Jha P Mills A Musgrove P eds 2006 Disease Control Priorities in Developing Countries World Bank Publications p 689 ISBN 9780821361801 Archived from the original on 2017 05 10 Macintosh M Moore T 1999 Caring for the Seriously Ill Patient 2E 2 ed CRC Press p 57 ISBN 9780340705827 Archived from the original on 2017 01 18 Dart RC 2004 Medical 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114 doi 10 1177 1479972308090691 PMID 18539725 S2CID 6141420 Further reading EditKallstrom TJ June 2002 AARC Clinical Practice Guideline oxygen therapy for adults in the acute care facility 2002 revision amp update Respiratory Care 47 6 717 20 PMID 12078655 Cahill Lambert AE November 2005 Adult domiciliary oxygen therapy a patient s perspective The Medical Journal of Australia 183 9 472 3 doi 10 5694 j 1326 5377 2005 tb07125 x PMID 16274348 Portal Medicine Retrieved from https en wikipedia org w index php title Oxygen therapy amp oldid 1170470983, wikipedia, wiki, book, books, library,

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