![]() Given that all cases resulting in cardiac arrest that do not achieve ROSC will eventually result in asystole, PEA can appear like nothing more than a warning sign. Pulseless electrical activity, or more commonly referred to as PEA, can seem like a pre-emptive factor to asystole. What Exactly Is Pulseless Electrical Activity If the heart’s electrical system cannot be moved into a rhythm capable of defibrillation or if it fails to achieve ROSC, the person dies. It provides a path for health professionals to encourage ROSC. Health professionals dealing with someone in cardiac arrest tend to view medications and electrical stimulation (defibrillation) as the best ways to encourage return of spontaneous circulation (ROSC). What does that mean? Consider the reason asystole is an unshockable rhythm. The most common pathway to this form of asystole is hypoxia with metabolic acidosis.īoth types of asystole may also occur untreated ventricular fibrillation and before attempts to defibrillate. In other words, the heart’s electrical system still functions, but it does not have the power to generate an action potential. This results in a failure to generate any depolarization of cardiac tissue. Secondary asystole occurs when factors outside of the nerve system and the heart’s electrical conduction system fail. For example, these conditions may contribute to asystole:Įach of these conditions involves damage to the nerves surrounding the neck, face, and head. ![]() It may result from multiple forms of trauma, says. With that in mind, primary systole may result from a unique type of bradycardia, bradyarrhythmia. ![]() When asystole occurs, the blockage of an action potential results in a loss of rhythm and heartbeat. As the pulse moves downward, the right ventricle contracts pulsing blood back up through the pulmonary artery and to the lungs. In this case, the SA node begins the depolarization process, triggering the depolarization of the right atrium. Remember that an action potential describes the depolarization of a cell in response to a stimulus.
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