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Benign prostatic hyperplasia

Benign prostatic hyperplasia (BPH), also called prostate enlargement, is a noncancerous increase in size of the prostate gland.[1] Symptoms may include frequent urination, trouble starting to urinate, weak stream, inability to urinate, or loss of bladder control.[1] Complications can include urinary tract infections, bladder stones, and chronic kidney problems.[2]

Benign prostatic hyperplasia
Other namesBenign enlargement of the prostate (BEP, BPE), adenofibromyomatous hyperplasia, benign prostatic hypertrophy,[1] benign prostatic obstruction[1]
Diagram of a normal prostate (left) and benign prostatic hyperplasia (right)
SpecialtyUrology
SymptomsFrequent urination, trouble starting to urinate, weak stream, inability to urinate, loss of bladder control[1]
ComplicationsUrinary tract infections, bladder stones, kidney failure[2]
Usual onsetAge over 40[1]
CausesUnclear[1]
Risk factorsFamily history, obesity, type 2 diabetes, not enough exercise, erectile dysfunction[1]
Diagnostic methodBased on symptoms and examination after ruling out other possible causes[2]
Differential diagnosisHeart failure, diabetes, prostate cancer[2]
TreatmentLifestyle changes, medications, a number of procedures, surgery[1][2]
MedicationAlpha blockers such as terazosin, 5α-reductase inhibitors such as finasteride[1]
Frequency105 million affected globally (2015)[3]

The cause is unclear.[1] Risk factors include a family history, obesity, type 2 diabetes, not enough exercise, and erectile dysfunction.[1] Medications like pseudoephedrine, anticholinergics, and calcium channel blockers may worsen symptoms.[2] The underlying mechanism involves the prostate pressing on the urethra and thereby making it difficult to pass urine out of the bladder.[1] Diagnosis is typically based on symptoms and examination after ruling out other possible causes.[2]

Treatment options include lifestyle changes, medications, a number of procedures, and surgery.[1][2] In those with mild symptoms, weight loss, exercise, and decreasing caffeine intake are recommended, although the quality of the evidence for exercise is low.[2][4] In those with more significant symptoms, medications may include alpha blockers such as terazosin or 5α-reductase inhibitors such as finasteride.[1] Surgical removal of part of the prostate may be carried out in those who do not improve with other measures.[2] Some herbal medicines that have been studied, such as saw palmetto, have not been shown to help.[2] Other herbal medicines somewhat effective at improving urine flow include beta-sitosterol[5] from Hypoxis rooperi (African star grass), pygeum (extracted from the bark of Prunus africana),[6] pumpkin seeds (Cucurbita pepo), and stinging nettle (Urtica dioica) root.[7]

About 105 million men are affected globally.[3] BPH typically begins after the age of 40.[1] Half of males age 50 and over are affected.[2] After the age of 80, that figure climbs to as high as about 90% of males affected.[8][9][1] Although prostate specific antigen levels may be elevated in males with BPH, the condition does not increase the risk of prostate cancer.[10]

Signs and symptoms edit

 

BPH is the most common cause of lower urinary tract symptoms (LUTS), which are divided into storage, voiding, and symptoms which occur after urination.[11] Storage symptoms include the need to urinate frequently, waking at night to urinate, urgency (compelling need to void that cannot be deferred), involuntary urination, including involuntary urination at night, or urge incontinence (urine leak following a strong sudden need to urinate).[12] Voiding symptoms include urinary hesitancy (a delay between trying to urinate and the flow actually beginning), intermittency (not continuous),[13] involuntary interruption of voiding, weak urinary stream, straining to void, a sensation of incomplete emptying, and uncontrollable leaking after the end of urination.[14][15][16] These symptoms may be accompanied by bladder pain or pain while urinating, called dysuria.[17]

Bladder outlet obstruction (BOO) can be caused by BPH.[18] Symptoms are abdominal pain, a continuous feeling of a full bladder, frequent urination, acute urinary retention (inability to urinate), pain during urination (dysuria), problems starting urination (urinary hesitancy), slow urine flow, starting and stopping (urinary intermittency), and nocturia.[19]

BPH can be a progressive disease, especially if left untreated. Incomplete voiding results in residual urine or urinary stasis, which can lead to an increased risk of urinary tract infection.[20]

Causes edit

Hormones edit

Most experts consider androgens (testosterone and related hormones) to play a permissive role in the development of BPH. This means that androgens must be present for BPH to occur, but do not necessarily directly cause the condition. This is supported by evidence suggesting that castrated boys do not develop BPH when they age. In an unusual study of 26 eunuchs from the palace of the Qing dynasty still living in Beijing in 1960, the prostate could not be felt in 81% of the studied eunuchs.[21] The average time since castration was 54 years (range, 41–65 years). On the other hand, some studies suggest that administering exogenous testosterone is not associated with a significant increase in the risk of BPH symptoms, so the role of testosterone in prostate cancer and BPH is still unclear. Further randomized controlled trials with more participants are needed to quantify any risk of giving exogenous testosterone.[22]

Dihydrotestosterone (DHT), a metabolite of testosterone, is a critical mediator of prostatic growth. DHT is synthesized in the prostate from circulating testosterone by the action of the enzyme 5α-reductase, type 2. DHT can act in an autocrine fashion on the stromal cells or in paracrine fashion by diffusing into nearby epithelial cells. In both of these cell types, DHT binds to nuclear androgen receptors and signals the transcription of growth factors that are mitogenic to the epithelial and stromal cells. DHT is ten times more potent than testosterone because it dissociates from the androgen receptor more slowly. The importance of DHT in causing nodular hyperplasia is supported by clinical observations in which an inhibitor of 5α-reductase such as finasteride is given to men with this condition. Therapy with a 5α-reductase inhibitor markedly reduces the DHT content of the prostate and, in turn, reduces prostate volume and BPH symptoms.[23][24]

Testosterone promotes prostate cell proliferation,[25] but relatively low levels of serum testosterone are found in patients with BPH.[26][27] One small study has shown that medical castration lowers the serum and prostate hormone levels unevenly, having less effect on testosterone and dihydrotestosterone levels in the prostate.[28]

Besides testosterone and DHT, other androgens are also known to play a crucial role in BPH development. C
21
11-oxygenated steroids (pregnanes) have been identified are precursors to 11-oxygenated androgens which are also potent agonists for the androgen receptor.[29] Specifically, steroids like 11β-hydroxyprogesterone and 11-ketoprogesterone can be converted to 11-ketodihydrotestosterone, an 11-oxo form of DHT with the same potency. These precursors have also been detected in tissue biopsy samples from patients with BPH, as well as in their serum levels.[30][31][32] Besides that, androgens biosythnesized via a backdoor pathway can contribute to the development of BPH.[30]

While there is some evidence that estrogen may play a role in the cause of BPH, this effect appears to be mediated mainly through local conversion of androgens to estrogen in the prostate tissue rather than a direct effect of estrogen itself.[33] In canine in vivo studies castration, which significantly reduced androgen levels but left estrogen levels unchanged, caused significant atrophy of the prostate.[34] Studies looking for a correlation between prostatic hyperplasia and serum estrogen levels in humans have generally shown none.[27][35]

In 2008, Gat et al. published evidence that BPH is caused by failure in the spermatic venous drainage system resulting in increased hydrostatic pressure and local testosterone levels elevated more than 100 fold above serum levels.[36] If confirmed, this mechanism explains why serum androgen levels do not seem to correlate with BPH and why giving exogenous testosterone would not make much difference.

Diet edit

Studies indicate that dietary patterns may affect development of BPH, but further research is needed to clarify any important relationship.[37] Studies from China suggest that greater protein intake may be a factor in development of BPH. Men older than 60 in rural areas had very low rates of clinical BPH, while men living in cities and consuming more animal protein had a higher incidence.[38][39] On the other hand, a study in Japanese-American men in Hawaii found a strong negative association with alcohol intake, but a weak positive association with beef intake.[40] In a large prospective cohort study in the US (the Health Professionals Follow-up Study), investigators reported modest associations between BPH (men with strong symptoms of BPH or surgically confirmed BPH) and total energy and protein, but not fat intake.[41] There is also epidemiological evidence linking BPH with metabolic syndrome (concurrent obesity, impaired glucose metabolism and diabetes, high triglyceride levels, high levels of low-density cholesterol, and hypertension).[42]

Degeneration edit

Benign prostatic hyperplasia is an age-related disease. Misrepair-accumulation aging theory[43] suggests that development of benign prostatic hyperplasia is a consequence of fibrosis and weakening of the muscular tissue in the prostate.[44] The muscular tissue is important in the functionality of the prostate, and provides the force for excreting the fluid produced by prostatic glands. However, repeated contractions and dilations of myofibers will unavoidably cause injuries and broken myofibers. Myofibers have a low potential for regeneration; therefore, collagen fibers need to be used to replace the broken myofibers. Such misrepairs make the muscular tissue weak in functioning, and the fluid secreted by glands cannot be excreted completely. Then, the accumulation of fluid in glands increases the resistance of muscular tissue during the movements of contractions and dilations, and more and more myofibers will be broken and replaced by collagen fibers.[45]

Pathophysiology edit

 
Benign prostate hyperplasia

As men age, the enzymes aromatase and 5-alpha reductase increase in activity. These enzymes are responsible for converting androgen hormones into estrogen and dihydrotestosterone, respectively. This metabolism of androgen hormones leads to a decrease in testosterone but increased levels of DHT and estrogen.

Both the glandular epithelial cells and the stromal cells (including muscular fibers) undergo hyperplasia in BPH.[2] Most sources agree that of the two tissues, stromal hyperplasia predominates, but the exact ratio of the two is unclear.[46]: 694 

Anatomically the median and lateral lobes are usually enlarged, due to their highly glandular composition. The anterior lobe has little in the way of glandular tissue and is seldom enlarged. (Carcinoma of the prostate typically occurs in the posterior lobe – hence the ability to discern an irregular outline per rectal examination). The earliest microscopic signs of BPH usually begin between the age of 30 and 50 years old in the PUG, which is posterior to the proximal urethra.[46]: 694  In BPH, the majority of growth occurs in the transition zone (TZ) of the prostate.[46]: 694  In addition to these two classic areas, the peripheral zone (PZ) is also involved to a lesser extent.[46]: 695  Prostatic cancer typically occurs in the PZ. However, BPH nodules, usually from the TZ are often biopsied anyway to rule out cancer in the TZ.[46]: 695  BPH can be a progressive growth that in rare instances leads to exceptional enlargement.[47] In some males, the prostate enlargement exceeds 200 to 500 grams.[47] This condition has been defined as giant prostatic hyperplasia (GPH).[47]

Diagnosis edit

The clinical diagnosis of BPH is based on a history of LUTS (lower urinary tract symptoms), a digital rectal exam, and exclusion of other causes of similar signs and symptoms. The degree of LUTS does not necessarily correspond to the size of the prostate. An enlarged prostate gland on rectal examination that is symmetric and smooth supports a diagnosis of BPH.[2] However, if the prostate gland feels asymmetrical, firm, or nodular, this raises concern for prostate cancer.[2]

Validated questionnaires such as the American Urological Association Symptom Index (AUA-SI), the International Prostate Symptom Score (I-PSS), and more recently the UWIN score (urgency, weak stream, incomplete emptying, and nocturia) are useful aids to making the diagnosis of BPH and quantifying the severity of symptoms.[2][48][49]

Laboratory investigations edit

Urinalysis is typically performed when LUTS are present and BPH is suspected to evaluate for signs of a urinary tract infection, glucose in the urine (suggestive of diabetes), or protein in the urine (suggestive of kidney disease).[2] Bloodwork including kidney function tests and prostate specific antigen (PSA) are often ordered to evaluate for kidney damage and prostate cancer, respectively.[2] However, checking blood PSA levels for prostate cancer screening is controversial and not necessarily indicated in every evaluation for BPH.[2] Benign prostatic hyperplasia and prostate cancer are both capable of increasing blood PSA levels and PSA elevation is unable to differentiate these two conditions well.[2] If PSA levels are checked and are high, then further investigation is warranted. Measures including PSA density, free PSA, rectal examination, and transrectal ultrasonography may be helpful in determining whether a PSA increase is due to BPH or prostate cancer.[2]

Imaging and other investigations edit

Uroflowmetry is done to measure the rate of urine flow and total volume of urine voided when the subject is urinating.[50]

Abdominal ultrasound examination of the prostate and kidneys is often performed to rule out hydronephrosis and hydroureter. Incidentally, cysts, tumours, and stones may be found on ultrasound. Post-void residual volume of more than 100 ml may indicate significant obstruction.[51] Prostate size of 30 cc or more indicates enlargement of the prostate.[52]

Prostatic calcification can be detected through transrectal ultrasound (TRUS). Calcification is due to solidification of prostatic secretions or calcified corpora amylacea (hyaline masses on the prostate gland). Calcification is also found in a variety of other conditions such as prostatitis, chronic pelvic pain syndrome, and prostate cancer.[53][54] For those with elevated levels of PSA, TRUS guided biopsy is performed to take a sample of the prostate for investigation.[55] Although MRI is more accurate than TRUS in determining prostate volume, TRUS is less expensive and almost as accurate as MRI. Therefore, TRUS is still preferred to measure prostate volume.[56]

Differential diagnosis edit

Medical conditions edit

The differential diagnosis for LUTS is broad and includes various medical conditions, neurologic disorders, and other diseases of the bladder, urethra, and prostate such as bladder cancer, urinary tract infection, urethral stricture, urethral calculi (stones), chronic prostatitis, and prostate cancer.[2] Neurogenic bladder can cause urinary retention and cause symptoms similar to those of BPH. This may occur as a result of uncoordinated contraction of the bladder muscle or impairment in the timing of bladder muscle contraction and urethral sphincter relaxation.[2] Notable causes of neurogenic bladder include disorders of the central nervous system such as Parkinson's disease, multiple sclerosis, and spinal cord injuries as well as disorders of the peripheral nervous system such as diabetes mellitus, vitamin B12 deficiency, and alcohol-induced nerve damage.[2] Individuals affected by heart failure often experience nighttime awakenings to urinate due to redistribution of fluid accumulated in swollen legs.[2]

Medications edit

Certain medications can increase urination difficulties by increasing bladder outlet resistance due to increased smooth muscle tone at the prostate or bladder neck and contribute to LUTS.[2] Alpha-adrenergic agonist medications, such as decongestants with pseudoephedrine can increase bladder outlet resistance.[2] In contrast, calcium channel blockers and anticholinergic medications can worsen urinary retention by promoting bladder muscle relaxation.[2] Diuretic medications such as loop diuretics (e.g., furosemide) or thiazides (e.g., chlorthalidone) can cause or worsen urinary frequency and nighttime awakenings to urinate.[2]

Management edit

When treating and managing benign prostatic hyperplasia, the aim is to prevent complications related to the disease and improve or relieve symptoms.[57] Approaches used include lifestyle modifications, medications, catheterisation and surgery.

Lifestyle edit

Lifestyle alterations to address the symptoms of BPH include physical activity,[58] decreasing fluid intake before bedtime, moderating the consumption of alcohol and caffeine-containing products and following a timed voiding schedule.

Patients can also attempt to avoid products and medications with anticholinergic properties that may exacerbate urinary retention symptoms of BPH, including antihistamines, decongestants, opioids, and tricyclic antidepressants; however, changes in medications should be done with input from a medical professional.[59]

Physical activity edit

Physical activity has been recommended as a treatment for urinary tract symptoms. A 2019 Cochrane review of six studies involving 652 men assessing the effects of physical activity alone, physical activity as a part of a self-management program, among others. However, the quality of evidence was very low and therefore it remains uncertain whether physical activity is helpful in men experiencing urinary symptoms caused by benign prostatic hyperplasia.[60]

Voiding position edit

Voiding position when urinating may influence urodynamic parameters (urinary flow rate, voiding time, and post-void residual volume).[61] A meta-analysis found no differences between the standing and sitting positions for healthy males, but that, for elderly males with lower urinary tract symptoms, voiding in the sitting position-- [62]

  • decreased the post void residual volume;
  • increased the maximum urinary flow, comparable with pharmacological intervention; and
  • decreased the voiding time.

This urodynamic profile is associated with a lower risk of urologic complications, such as cystitis and bladder stones.

Medications edit

The two main medication classes for BPH management are alpha blockers and 5α-reductase inhibitors.[63]

Alpha blockers edit

Selective α1-blockers are the most common choice for initial therapy.[64][65][66] They include alfuzosin,[67][68] doxazosin,[69] silodosin, tamsulosin, terazosin, and naftopidil.[57] They have a small to moderate benefit at improving symptoms.[70][57][71] Selective alpha-1 blockers are similar in effectiveness but have slightly different side effect profiles.[70][57][71] Alpha blockers relax smooth muscle in the prostate and the bladder neck, thus decreasing the blockage of urine flow. Common side effects of alpha blockers include orthostatic hypotension (a head rush or dizzy spell when standing up or stretching), ejaculation changes, erectile dysfunction,[72] headaches, nasal congestion, and weakness. For men with LUTS due to an enlarged prostate, the effects of naftopidil, tamsulosin and silodosin on urinary symptoms and quality of life may be similar.[57] Naftopidil and tamsulosin may have similar levels of unwanted sexual side effects but fewer unwanted side effects than silodosin.[57]

Tamsulosin and silodosin are selective α1 receptor blockers that preferentially bind to the α1A receptor in the prostate instead of the α1B receptor in the blood vessels. Less-selective α1 receptor blockers such as terazosin and doxazosin may lower blood pressure. The older, less selective α1-adrenergic blocker prazosin is not a first line choice for either high blood pressure or prostatic hyperplasia; it is a choice for patients who present with both problems at the same time. The older, broadly non-selective alpha blocker medications such as phenoxybenzamine are not recommended for control of BPH.[73] Non-selective alpha blockers such as terazosin and doxazosin may also require slow dose adjustments as they can lower blood pressure and cause syncope (fainting) if the response to the medication is too strong.

5α-reductase inhibitors edit

The 5α-reductase inhibitors finasteride and dutasteride may also be used in people with BPH.[74] These medications inhibit the 5α-reductase enzyme, which, in turn, inhibits production of DHT, a hormone responsible for enlarging the prostate. Effects may take longer to appear than alpha blockers, but they persist for many years.[75] When used together with alpha blockers, no benefit was reported in short-term trials, but in a longer-term study (3–4 years) there was a greater reduction in BPH progression to acute urinary retention and surgery than with either agent alone, especially in people with more severe symptoms and larger prostates.[76][77][78] Other trials have confirmed reductions in symptoms, within 6 months in one trial, an effect that was maintained after withdrawal of the alpha blocker.[77][79] Side effects include decreased libido and ejaculatory or erectile dysfunction.[80][81] The 5α-reductase inhibitors are contraindicated in pregnant women because of their teratogenicity due to interference with fetal testosterone metabolism, and as a precaution, pregnant women should not handle crushed or broken tablets.[82]

Phosphodiesterase inhibitors (PDE) edit

A 2018 Cochrane review of studies on men over 60 with moderate to severe lower urinary tract symptoms analyzed the impacts of phosphodiesterase inhibitors (PDE) in comparison to other drugs.[83] These drugs may improve urinary symptoms slightly and reduce urinary bother but may also cause more side effects compared to placebo. The evidence in this review found that there is probably no difference between PDE and alpha blockers, however when used in combination they may provide a greater improvement in symptoms (with more side effects). PDE also likely improves symptoms when used in combination with 5-alpha reductase inhibitors.

Several phosphodiesterase-5 inhibitors are also effective, but may require multiple doses daily to maintain adequate urine flow.[84][85] Tadalafil, a phosphodiesterase-5 inhibitor, was considered then rejected by NICE in the UK for the treatment of symptoms associated with BPH.[86] In 2011, the U.S. Food and Drug Administration approved tadalafil to treat the signs and symptoms of benign prostatic hyperplasia, and for the treatment of BPH and erectile dysfunction (ED), when the conditions occur simultaneously.[87]

Others edit

Antimuscarinics such as tolterodine may also be used, especially in combination with alpha blockers.[88] They act by decreasing acetylcholine effects on the smooth muscle of the bladder, thus helping control symptoms of an overactive bladder.[89]

Self-catheterization edit

Intermittent urinary catheterization is used to relieve the bladder in people with urinary retention. Self-catheterization is an option in BPH when it is difficult or impossible to completely empty the bladder.[90] Urinary tract infection is the most common complication of intermittent catheterization.[91] Several techniques and types of catheter are available, including sterile (single-use) and clean (multiple use) catheters, but, based on current information, none is superior to others in reducing the incidence of urinary tract infection.[92]

Surgery edit

 
Transurethral resection of the prostate (TURP)

If medical treatment is not effective, surgery may be performed. Surgical techniques used include the following:

Other less invasive surgical approaches (requiring spinal anesthesia) include:

  • Holmium laser ablation of the prostate (HoLAP)
  • Holmium laser enucleation of the prostate (HoLeP)
  • Thulium laser transurethral vaporesection of the prostate (ThuVARP)
  • Photoselective vaporization of the prostate (PVP)
  • Aquablation therapy: a type of surgery using a water jet to remove prostatic tissue.

Minimally invasive procedures edit

Some less invasive procedures are available according to patients' preferences and co-morbidities. These are performed as outpatient procedures with local anesthesia.

  • Prostatic artery embolization: an endovascular procedure performed in interventional radiology.[95] Through catheters, embolic agents are released in the main branches of the prostatic artery, in order to induce a decrease in the size of the prostate gland, thus reducing the urinary symptoms.[96]
  • Water vapor thermal therapy (marketed as Rezum): This is a newer office procedure for removing prostate tissue using steam aimed at preserving sexual function.
  • Prostatic urethral lift (marketed as UroLift): This intervention consists of a system of a device and an implant designed to pull the prostatic lobe away from the urethra.[97]
  • Transurethral microwave thermotherapy (TUMT) is an outpatient procedure that is less invasive compared to surgery and involves using microwaves (heat) to shrink prostate tissue that is enlarged.[93]
  • Temporary implantable nitinol device (TIND and iTIND): is a device that is placed in the urethra that, when released, is expanded, reshaping the urethra and the bladder neck.[98]

Alternative medicine edit

While herbal remedies are commonly used, a 2016 review found the herbs studied to be no better than placebos.[99] Particularly, several reviews found that saw palmetto extract, while one of the most commonly used, is no better than a placebo both in symptom relief and in decreasing prostate size.[100][101][102]

Epidemiology edit

 
Disability-adjusted life year for benign prostatic hyperplasia per 100,000 inhabitants in 2004[103]
  no data
  less than 20
  20–28
  28–36
  36–44
  44–52
  52–60
  60–68
  68–76
  76–84
  84–92
  92–100
  more than 100

Globally, benign prostatic hyperplasia affects about 210 million males as of 2010 (6% of the population).[104]

The prostate gets larger in most men as they get older. For a symptom-free man of 46 years, the risk of developing BPH over the next 30 years is 45%. Incidence rates increase from 3 cases per 1000 man-years at age 45–49 years, to 38 cases per 1000 man-years by the age of 75–79 years. While the prevalence rate is 2.7% for men aged 45–49, it increases to 24% by the age of 80 years.[105]

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External links edit

    benign, prostatic, hyperplasia, also, called, prostate, enlargement, noncancerous, increase, size, prostate, gland, symptoms, include, frequent, urination, trouble, starting, urinate, weak, stream, inability, urinate, loss, bladder, control, complications, inc. Benign prostatic hyperplasia BPH also called prostate enlargement is a noncancerous increase in size of the prostate gland 1 Symptoms may include frequent urination trouble starting to urinate weak stream inability to urinate or loss of bladder control 1 Complications can include urinary tract infections bladder stones and chronic kidney problems 2 Benign prostatic hyperplasiaOther namesBenign enlargement of the prostate BEP BPE adenofibromyomatous hyperplasia benign prostatic hypertrophy 1 benign prostatic obstruction 1 Diagram of a normal prostate left and benign prostatic hyperplasia right SpecialtyUrologySymptomsFrequent urination trouble starting to urinate weak stream inability to urinate loss of bladder control 1 ComplicationsUrinary tract infections bladder stones kidney failure 2 Usual onsetAge over 40 1 CausesUnclear 1 Risk factorsFamily history obesity type 2 diabetes not enough exercise erectile dysfunction 1 Diagnostic methodBased on symptoms and examination after ruling out other possible causes 2 Differential diagnosisHeart failure diabetes prostate cancer 2 TreatmentLifestyle changes medications a number of procedures surgery 1 2 MedicationAlpha blockers such as terazosin 5a reductase inhibitors such as finasteride 1 Frequency105 million affected globally 2015 3 The cause is unclear 1 Risk factors include a family history obesity type 2 diabetes not enough exercise and erectile dysfunction 1 Medications like pseudoephedrine anticholinergics and calcium channel blockers may worsen symptoms 2 The underlying mechanism involves the prostate pressing on the urethra and thereby making it difficult to pass urine out of the bladder 1 Diagnosis is typically based on symptoms and examination after ruling out other possible causes 2 Treatment options include lifestyle changes medications a number of procedures and surgery 1 2 In those with mild symptoms weight loss exercise and decreasing caffeine intake are recommended although the quality of the evidence for exercise is low 2 4 In those with more significant symptoms medications may include alpha blockers such as terazosin or 5a reductase inhibitors such as finasteride 1 Surgical removal of part of the prostate may be carried out in those who do not improve with other measures 2 Some herbal medicines that have been studied such as saw palmetto have not been shown to help 2 Other herbal medicines somewhat effective at improving urine flow include beta sitosterol 5 from Hypoxis rooperi African star grass pygeum extracted from the bark of Prunus africana 6 pumpkin seeds Cucurbita pepo and stinging nettle Urtica dioica root 7 About 105 million men are affected globally 3 BPH typically begins after the age of 40 1 Half of males age 50 and over are affected 2 After the age of 80 that figure climbs to as high as about 90 of males affected 8 9 1 Although prostate specific antigen levels may be elevated in males with BPH the condition does not increase the risk of prostate cancer 10 Contents 1 Signs and symptoms 2 Causes 2 1 Hormones 2 2 Diet 2 3 Degeneration 3 Pathophysiology 4 Diagnosis 4 1 Laboratory investigations 4 2 Imaging and other investigations 4 3 Differential diagnosis 4 3 1 Medical conditions 4 3 2 Medications 5 Management 5 1 Lifestyle 5 1 1 Physical activity 5 1 2 Voiding position 5 2 Medications 5 2 1 Alpha blockers 5 2 2 5a reductase inhibitors 5 2 3 Phosphodiesterase inhibitors PDE 5 2 4 Others 5 3 Self catheterization 5 4 Surgery 5 5 Minimally invasive procedures 5 6 Alternative medicine 6 Epidemiology 7 References 8 External linksSigns and symptoms edit nbsp BPH is the most common cause of lower urinary tract symptoms LUTS which are divided into storage voiding and symptoms which occur after urination 11 Storage symptoms include the need to urinate frequently waking at night to urinate urgency compelling need to void that cannot be deferred involuntary urination including involuntary urination at night or urge incontinence urine leak following a strong sudden need to urinate 12 Voiding symptoms include urinary hesitancy a delay between trying to urinate and the flow actually beginning intermittency not continuous 13 involuntary interruption of voiding weak urinary stream straining to void a sensation of incomplete emptying and uncontrollable leaking after the end of urination 14 15 16 These symptoms may be accompanied by bladder pain or pain while urinating called dysuria 17 Bladder outlet obstruction BOO can be caused by BPH 18 Symptoms are abdominal pain a continuous feeling of a full bladder frequent urination acute urinary retention inability to urinate pain during urination dysuria problems starting urination urinary hesitancy slow urine flow starting and stopping urinary intermittency and nocturia 19 BPH can be a progressive disease especially if left untreated Incomplete voiding results in residual urine or urinary stasis which can lead to an increased risk of urinary tract infection 20 Causes editHormones edit Most experts consider androgens testosterone and related hormones to play a permissive role in the development of BPH This means that androgens must be present for BPH to occur but do not necessarily directly cause the condition This is supported by evidence suggesting that castrated boys do not develop BPH when they age In an unusual study of 26 eunuchs from the palace of the Qing dynasty still living in Beijing in 1960 the prostate could not be felt in 81 of the studied eunuchs 21 The average time since castration was 54 years range 41 65 years On the other hand some studies suggest that administering exogenous testosterone is not associated with a significant increase in the risk of BPH symptoms so the role of testosterone in prostate cancer and BPH is still unclear Further randomized controlled trials with more participants are needed to quantify any risk of giving exogenous testosterone 22 Dihydrotestosterone DHT a metabolite of testosterone is a critical mediator of prostatic growth DHT is synthesized in the prostate from circulating testosterone by the action of the enzyme 5a reductase type 2 DHT can act in an autocrine fashion on the stromal cells or in paracrine fashion by diffusing into nearby epithelial cells In both of these cell types DHT binds to nuclear androgen receptors and signals the transcription of growth factors that are mitogenic to the epithelial and stromal cells DHT is ten times more potent than testosterone because it dissociates from the androgen receptor more slowly The importance of DHT in causing nodular hyperplasia is supported by clinical observations in which an inhibitor of 5a reductase such as finasteride is given to men with this condition Therapy with a 5a reductase inhibitor markedly reduces the DHT content of the prostate and in turn reduces prostate volume and BPH symptoms 23 24 Testosterone promotes prostate cell proliferation 25 but relatively low levels of serum testosterone are found in patients with BPH 26 27 One small study has shown that medical castration lowers the serum and prostate hormone levels unevenly having less effect on testosterone and dihydrotestosterone levels in the prostate 28 Besides testosterone and DHT other androgens are also known to play a crucial role in BPH development C21 11 oxygenated steroids pregnanes have been identified are precursors to 11 oxygenated androgens which are also potent agonists for the androgen receptor 29 Specifically steroids like 11b hydroxyprogesterone and 11 ketoprogesterone can be converted to 11 ketodihydrotestosterone an 11 oxo form of DHT with the same potency These precursors have also been detected in tissue biopsy samples from patients with BPH as well as in their serum levels 30 31 32 Besides that androgens biosythnesized via a backdoor pathway can contribute to the development of BPH 30 While there is some evidence that estrogen may play a role in the cause of BPH this effect appears to be mediated mainly through local conversion of androgens to estrogen in the prostate tissue rather than a direct effect of estrogen itself 33 In canine in vivo studies castration which significantly reduced androgen levels but left estrogen levels unchanged caused significant atrophy of the prostate 34 Studies looking for a correlation between prostatic hyperplasia and serum estrogen levels in humans have generally shown none 27 35 In 2008 Gat et al published evidence that BPH is caused by failure in the spermatic venous drainage system resulting in increased hydrostatic pressure and local testosterone levels elevated more than 100 fold above serum levels 36 If confirmed this mechanism explains why serum androgen levels do not seem to correlate with BPH and why giving exogenous testosterone would not make much difference Diet edit Studies indicate that dietary patterns may affect development of BPH but further research is needed to clarify any important relationship 37 Studies from China suggest that greater protein intake may be a factor in development of BPH Men older than 60 in rural areas had very low rates of clinical BPH while men living in cities and consuming more animal protein had a higher incidence 38 39 On the other hand a study in Japanese American men in Hawaii found a strong negative association with alcohol intake but a weak positive association with beef intake 40 In a large prospective cohort study in the US the Health Professionals Follow up Study investigators reported modest associations between BPH men with strong symptoms of BPH or surgically confirmed BPH and total energy and protein but not fat intake 41 There is also epidemiological evidence linking BPH with metabolic syndrome concurrent obesity impaired glucose metabolism and diabetes high triglyceride levels high levels of low density cholesterol and hypertension 42 Degeneration edit Benign prostatic hyperplasia is an age related disease Misrepair accumulation aging theory 43 suggests that development of benign prostatic hyperplasia is a consequence of fibrosis and weakening of the muscular tissue in the prostate 44 The muscular tissue is important in the functionality of the prostate and provides the force for excreting the fluid produced by prostatic glands However repeated contractions and dilations of myofibers will unavoidably cause injuries and broken myofibers Myofibers have a low potential for regeneration therefore collagen fibers need to be used to replace the broken myofibers Such misrepairs make the muscular tissue weak in functioning and the fluid secreted by glands cannot be excreted completely Then the accumulation of fluid in glands increases the resistance of muscular tissue during the movements of contractions and dilations and more and more myofibers will be broken and replaced by collagen fibers 45 Pathophysiology edit nbsp Benign prostate hyperplasia As men age the enzymes aromatase and 5 alpha reductase increase in activity These enzymes are responsible for converting androgen hormones into estrogen and dihydrotestosterone respectively This metabolism of androgen hormones leads to a decrease in testosterone but increased levels of DHT and estrogen Both the glandular epithelial cells and the stromal cells including muscular fibers undergo hyperplasia in BPH 2 Most sources agree that of the two tissues stromal hyperplasia predominates but the exact ratio of the two is unclear 46 694 Anatomically the median and lateral lobes are usually enlarged due to their highly glandular composition The anterior lobe has little in the way of glandular tissue and is seldom enlarged Carcinoma of the prostate typically occurs in the posterior lobe hence the ability to discern an irregular outline per rectal examination The earliest microscopic signs of BPH usually begin between the age of 30 and 50 years old in the PUG which is posterior to the proximal urethra 46 694 In BPH the majority of growth occurs in the transition zone TZ of the prostate 46 694 In addition to these two classic areas the peripheral zone PZ is also involved to a lesser extent 46 695 Prostatic cancer typically occurs in the PZ However BPH nodules usually from the TZ are often biopsied anyway to rule out cancer in the TZ 46 695 BPH can be a progressive growth that in rare instances leads to exceptional enlargement 47 In some males the prostate enlargement exceeds 200 to 500 grams 47 This condition has been defined as giant prostatic hyperplasia GPH 47 Diagnosis editThe clinical diagnosis of BPH is based on a history of LUTS lower urinary tract symptoms a digital rectal exam and exclusion of other causes of similar signs and symptoms The degree of LUTS does not necessarily correspond to the size of the prostate An enlarged prostate gland on rectal examination that is symmetric and smooth supports a diagnosis of BPH 2 However if the prostate gland feels asymmetrical firm or nodular this raises concern for prostate cancer 2 Validated questionnaires such as the American Urological Association Symptom Index AUA SI the International Prostate Symptom Score I PSS and more recently the UWIN score urgency weak stream incomplete emptying and nocturia are useful aids to making the diagnosis of BPH and quantifying the severity of symptoms 2 48 49 Laboratory investigations edit Urinalysis is typically performed when LUTS are present and BPH is suspected to evaluate for signs of a urinary tract infection glucose in the urine suggestive of diabetes or protein in the urine suggestive of kidney disease 2 Bloodwork including kidney function tests and prostate specific antigen PSA are often ordered to evaluate for kidney damage and prostate cancer respectively 2 However checking blood PSA levels for prostate cancer screening is controversial and not necessarily indicated in every evaluation for BPH 2 Benign prostatic hyperplasia and prostate cancer are both capable of increasing blood PSA levels and PSA elevation is unable to differentiate these two conditions well 2 If PSA levels are checked and are high then further investigation is warranted Measures including PSA density free PSA rectal examination and transrectal ultrasonography may be helpful in determining whether a PSA increase is due to BPH or prostate cancer 2 Imaging and other investigations edit Uroflowmetry is done to measure the rate of urine flow and total volume of urine voided when the subject is urinating 50 Abdominal ultrasound examination of the prostate and kidneys is often performed to rule out hydronephrosis and hydroureter Incidentally cysts tumours and stones may be found on ultrasound Post void residual volume of more than 100 ml may indicate significant obstruction 51 Prostate size of 30 cc or more indicates enlargement of the prostate 52 Prostatic calcification can be detected through transrectal ultrasound TRUS Calcification is due to solidification of prostatic secretions or calcified corpora amylacea hyaline masses on the prostate gland Calcification is also found in a variety of other conditions such as prostatitis chronic pelvic pain syndrome and prostate cancer 53 54 For those with elevated levels of PSA TRUS guided biopsy is performed to take a sample of the prostate for investigation 55 Although MRI is more accurate than TRUS in determining prostate volume TRUS is less expensive and almost as accurate as MRI Therefore TRUS is still preferred to measure prostate volume 56 Differential diagnosis edit Medical conditions edit The differential diagnosis for LUTS is broad and includes various medical conditions neurologic disorders and other diseases of the bladder urethra and prostate such as bladder cancer urinary tract infection urethral stricture urethral calculi stones chronic prostatitis and prostate cancer 2 Neurogenic bladder can cause urinary retention and cause symptoms similar to those of BPH This may occur as a result of uncoordinated contraction of the bladder muscle or impairment in the timing of bladder muscle contraction and urethral sphincter relaxation 2 Notable causes of neurogenic bladder include disorders of the central nervous system such as Parkinson s disease multiple sclerosis and spinal cord injuries as well as disorders of the peripheral nervous system such as diabetes mellitus vitamin B12 deficiency and alcohol induced nerve damage 2 Individuals affected by heart failure often experience nighttime awakenings to urinate due to redistribution of fluid accumulated in swollen legs 2 Medications edit Certain medications can increase urination difficulties by increasing bladder outlet resistance due to increased smooth muscle tone at the prostate or bladder neck and contribute to LUTS 2 Alpha adrenergic agonist medications such as decongestants with pseudoephedrine can increase bladder outlet resistance 2 In contrast calcium channel blockers and anticholinergic medications can worsen urinary retention by promoting bladder muscle relaxation 2 Diuretic medications such as loop diuretics e g furosemide or thiazides e g chlorthalidone can cause or worsen urinary frequency and nighttime awakenings to urinate 2 nbsp Micrograph showing nodular hyperplasia left off center of the prostate from a transurethral resection of the prostate TURP H amp E stain nbsp Microscopic examination of different types of prostate tissues stained with immuno histochemical techniques A Normal non neoplastic prostatic tissue NNT B Benign prostatic hyperplasia C High grade prostatic intraepithelial neoplasia D Prostatic adenocarcinoma PCA Management editWhen treating and managing benign prostatic hyperplasia the aim is to prevent complications related to the disease and improve or relieve symptoms 57 Approaches used include lifestyle modifications medications catheterisation and surgery Lifestyle edit Lifestyle alterations to address the symptoms of BPH include physical activity 58 decreasing fluid intake before bedtime moderating the consumption of alcohol and caffeine containing products and following a timed voiding schedule Patients can also attempt to avoid products and medications with anticholinergic properties that may exacerbate urinary retention symptoms of BPH including antihistamines decongestants opioids and tricyclic antidepressants however changes in medications should be done with input from a medical professional 59 Physical activity edit Physical activity has been recommended as a treatment for urinary tract symptoms A 2019 Cochrane review of six studies involving 652 men assessing the effects of physical activity alone physical activity as a part of a self management program among others However the quality of evidence was very low and therefore it remains uncertain whether physical activity is helpful in men experiencing urinary symptoms caused by benign prostatic hyperplasia 60 Voiding position edit Voiding position when urinating may influence urodynamic parameters urinary flow rate voiding time and post void residual volume 61 A meta analysis found no differences between the standing and sitting positions for healthy males but that for elderly males with lower urinary tract symptoms voiding in the sitting position 62 decreased the post void residual volume increased the maximum urinary flow comparable with pharmacological intervention and decreased the voiding time This urodynamic profile is associated with a lower risk of urologic complications such as cystitis and bladder stones Medications edit The two main medication classes for BPH management are alpha blockers and 5a reductase inhibitors 63 Alpha blockers edit Selective a1 blockers are the most common choice for initial therapy 64 65 66 They include alfuzosin 67 68 doxazosin 69 silodosin tamsulosin terazosin and naftopidil 57 They have a small to moderate benefit at improving symptoms 70 57 71 Selective alpha 1 blockers are similar in effectiveness but have slightly different side effect profiles 70 57 71 Alpha blockers relax smooth muscle in the prostate and the bladder neck thus decreasing the blockage of urine flow Common side effects of alpha blockers include orthostatic hypotension a head rush or dizzy spell when standing up or stretching ejaculation changes erectile dysfunction 72 headaches nasal congestion and weakness For men with LUTS due to an enlarged prostate the effects of naftopidil tamsulosin and silodosin on urinary symptoms and quality of life may be similar 57 Naftopidil and tamsulosin may have similar levels of unwanted sexual side effects but fewer unwanted side effects than silodosin 57 Tamsulosin and silodosin are selective a1 receptor blockers that preferentially bind to the a1A receptor in the prostate instead of the a1B receptor in the blood vessels Less selective a1 receptor blockers such as terazosin and doxazosin may lower blood pressure The older less selective a1 adrenergic blocker prazosin is not a first line choice for either high blood pressure or prostatic hyperplasia it is a choice for patients who present with both problems at the same time The older broadly non selective alpha blocker medications such as phenoxybenzamine are not recommended for control of BPH 73 Non selective alpha blockers such as terazosin and doxazosin may also require slow dose adjustments as they can lower blood pressure and cause syncope fainting if the response to the medication is too strong 5a reductase inhibitors edit The 5a reductase inhibitors finasteride and dutasteride may also be used in people with BPH 74 These medications inhibit the 5a reductase enzyme which in turn inhibits production of DHT a hormone responsible for enlarging the prostate Effects may take longer to appear than alpha blockers but they persist for many years 75 When used together with alpha blockers no benefit was reported in short term trials but in a longer term study 3 4 years there was a greater reduction in BPH progression to acute urinary retention and surgery than with either agent alone especially in people with more severe symptoms and larger prostates 76 77 78 Other trials have confirmed reductions in symptoms within 6 months in one trial an effect that was maintained after withdrawal of the alpha blocker 77 79 Side effects include decreased libido and ejaculatory or erectile dysfunction 80 81 The 5a reductase inhibitors are contraindicated in pregnant women because of their teratogenicity due to interference with fetal testosterone metabolism and as a precaution pregnant women should not handle crushed or broken tablets 82 Phosphodiesterase inhibitors PDE edit A 2018 Cochrane review of studies on men over 60 with moderate to severe lower urinary tract symptoms analyzed the impacts of phosphodiesterase inhibitors PDE in comparison to other drugs 83 These drugs may improve urinary symptoms slightly and reduce urinary bother but may also cause more side effects compared to placebo The evidence in this review found that there is probably no difference between PDE and alpha blockers however when used in combination they may provide a greater improvement in symptoms with more side effects PDE also likely improves symptoms when used in combination with 5 alpha reductase inhibitors Several phosphodiesterase 5 inhibitors are also effective but may require multiple doses daily to maintain adequate urine flow 84 85 Tadalafil a phosphodiesterase 5 inhibitor was considered then rejected by NICE in the UK for the treatment of symptoms associated with BPH 86 In 2011 the U S Food and Drug Administration approved tadalafil to treat the signs and symptoms of benign prostatic hyperplasia and for the treatment of BPH and erectile dysfunction ED when the conditions occur simultaneously 87 Others edit Antimuscarinics such as tolterodine may also be used especially in combination with alpha blockers 88 They act by decreasing acetylcholine effects on the smooth muscle of the bladder thus helping control symptoms of an overactive bladder 89 Self catheterization edit Intermittent urinary catheterization is used to relieve the bladder in people with urinary retention Self catheterization is an option in BPH when it is difficult or impossible to completely empty the bladder 90 Urinary tract infection is the most common complication of intermittent catheterization 91 Several techniques and types of catheter are available including sterile single use and clean multiple use catheters but based on current information none is superior to others in reducing the incidence of urinary tract infection 92 Surgery edit Main article Surgery for benign prostatic hyperplasia nbsp Transurethral resection of the prostate TURP If medical treatment is not effective surgery may be performed Surgical techniques used include the following Transurethral resection of the prostate TURP the gold standard 93 TURP is thought to be the most effective approach for improving urinary symptoms and urinary flow however this surgical procedure may be associated with complications in up to 20 of men 93 Surgery carries some risk of complications such as retrograde ejaculation most commonly erectile dysfunction urinary incontinence urethral strictures 94 Transurethral incision of the prostate TUIP rarely performed the technique is similar to TURP but less definitive Open prostatectomy not usually performed nowadays due to its high morbidity even if results are very good Other less invasive surgical approaches requiring spinal anesthesia include Holmium laser ablation of the prostate HoLAP Holmium laser enucleation of the prostate HoLeP Thulium laser transurethral vaporesection of the prostate ThuVARP Photoselective vaporization of the prostate PVP Aquablation therapy a type of surgery using a water jet to remove prostatic tissue Minimally invasive procedures edit Some less invasive procedures are available according to patients preferences and co morbidities These are performed as outpatient procedures with local anesthesia Prostatic artery embolization an endovascular procedure performed in interventional radiology 95 Through catheters embolic agents are released in the main branches of the prostatic artery in order to induce a decrease in the size of the prostate gland thus reducing the urinary symptoms 96 Water vapor thermal therapy marketed as Rezum This is a newer office procedure for removing prostate tissue using steam aimed at preserving sexual function Prostatic urethral lift marketed as UroLift This intervention consists of a system of a device and an implant designed to pull the prostatic lobe away from the urethra 97 Transurethral microwave thermotherapy TUMT is an outpatient procedure that is less invasive compared to surgery and involves using microwaves heat to shrink prostate tissue that is enlarged 93 Temporary implantable nitinol device TIND and iTIND is a device that is placed in the urethra that when released is expanded reshaping the urethra and the bladder neck 98 Alternative medicine edit While herbal remedies are commonly used a 2016 review found the herbs studied to be no better than placebos 99 Particularly several reviews found that saw palmetto extract while one of the most commonly used is no better than a placebo both in symptom relief and in decreasing prostate size 100 101 102 Epidemiology edit nbsp Disability adjusted life year for benign prostatic hyperplasia per 100 000 inhabitants in 2004 103 no data less than 20 20 28 28 36 36 44 44 52 52 60 60 68 68 76 76 84 84 92 92 100 more than 100 Globally benign prostatic hyperplasia affects about 210 million males as of 2010 6 of the population 104 The prostate gets larger in most men as they get older For a symptom free man of 46 years the risk of developing BPH over the next 30 years is 45 Incidence rates increase from 3 cases per 1000 man years at age 45 49 years to 38 cases per 1000 man years by the age of 75 79 years While the prevalence rate is 2 7 for men aged 45 49 it increases to 24 by the age of 80 years 105 References edit a b c d e f g h i j k l m n o p q Prostate Enlargement Benign Prostatic Hyperplasia NIDDK September 2014 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European Expert Panel October 2002 Incidence and prevalence of lower urinary tract symptoms suggestive of benign prostatic hyperplasia in primary care the Triumph project European Urology 42 4 323 8 doi 10 1016 S0302 2838 02 00354 8 PMID 12361895 External links edit nbsp Medicine portal nbsp Wikimedia Commons has media related to Benign prostatic hyperplasia Extrinsic Compression by Prostate Retrieved from https en wikipedia org w index php title Benign prostatic hyperplasia amp oldid 1216874422, wikipedia, wiki, book, books, library,

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