Sinoatrial arrest is a medical condition wherein the sinoatrial node of the heart transiently ceases to generate the electrical impulses that normally stimulate the myocardial tissues to contract and thus the heart to beat. It is defined as lasting from 2.0 seconds to several minutes.[1] Since the heart contains multiple pacemakers, this interruption of the cardiac cycle generally lasts only a few seconds before another part of the heart, such as the atrio-ventricular junction or the ventricles, begins pacing and restores the heart action. This condition can be detected on an electrocardiogram (ECG) as a brief period of irregular length with no electrical activity before either the sinoatrial node resumes normal pacing, or another pacemaker begins pacing. If a pacemaker other than the sinoatrial node is pacing the heart, this condition is known as an escape rhythm. If no other pacemaker begins pacing during an episode of sinus arrest it becomes a cardiac arrest. This condition is sometimes confused with sinoatrial block, a condition in which the pacing impulse is generated, but fails to conduct through the myocardium. Differential diagnosis of the two conditions is possible by examining the exact length of the interruption of cardiac activity. If the next available pacemaker takes over, it is in the following order:
Atrial escape (rate 60–80): originates within atria, not sinus node (normal P morphology is lost).
Junctional escape (rate 40–60): originates near the AV node; a normal P wave is not seen, may occasionally see a retrograde P wave.
David Da Costa; et al. (2002-03-02). "ABC of clinical electrocardiography". BMJ (Clinical Research Ed.). 324 (7336): 535–538. doi:10.1136/bmj.324.7336.535. PMC1122450. PMID 11872557. Retrieved 2008-04-28.
January 01, 1970
sinoatrial, arrest, medical, condition, wherein, sinoatrial, node, heart, transiently, ceases, generate, electrical, impulses, that, normally, stimulate, myocardial, tissues, contract, thus, heart, beat, defined, lasting, from, seconds, several, minutes, since. Sinoatrial arrest is a medical condition wherein the sinoatrial node of the heart transiently ceases to generate the electrical impulses that normally stimulate the myocardial tissues to contract and thus the heart to beat It is defined as lasting from 2 0 seconds to several minutes 1 Since the heart contains multiple pacemakers this interruption of the cardiac cycle generally lasts only a few seconds before another part of the heart such as the atrio ventricular junction or the ventricles begins pacing and restores the heart action This condition can be detected on an electrocardiogram ECG as a brief period of irregular length with no electrical activity before either the sinoatrial node resumes normal pacing or another pacemaker begins pacing If a pacemaker other than the sinoatrial node is pacing the heart this condition is known as an escape rhythm If no other pacemaker begins pacing during an episode of sinus arrest it becomes a cardiac arrest This condition is sometimes confused with sinoatrial block a condition in which the pacing impulse is generated but fails to conduct through the myocardium Differential diagnosis of the two conditions is possible by examining the exact length of the interruption of cardiac activity If the next available pacemaker takes over it is in the following order Atrial escape rate 60 80 originates within atria not sinus node normal P morphology is lost Junctional escape rate 40 60 originates near the AV node a normal P wave is not seen may occasionally see a retrograde P wave Ventricular escape rate 20 40 originates in ventricular conduction system no P wave wide abnormal QRS Sinoatrial arrestOther namesSinuatrial arrest sinus arrest sinus pauseSpecialtyCardiology Treatment includes stop medications that suppress the sinus node beta blocker calcium channel blocker digitalis may need pacing References edit UpToDate David Da Costa et al 2002 03 02 ABC of clinical electrocardiography BMJ Clinical Research Ed 324 7336 535 538 doi 10 1136 bmj 324 7336 535 PMC 1122450 PMID 11872557 Retrieved 2008 04 28 Retrieved from https en wikipedia org w index php title Sinoatrial arrest amp oldid 1197868274, wikipedia, wiki, book, books, library,
