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Asystole (New Latin, from Greek privative a "not, without" + systolē "contraction" [1] [2]) is the absence of ventricular contractions in the context of a lethal heart arrhythmia (in contrast to an induced asystole on a cooled patient on a heart-lung machine and general anesthesia during surgery necessitating stopping the heart).
Defibrillation is often an important step in cardiopulmonary resuscitation (CPR). [6] [7] CPR is an algorithm-based intervention aimed to restore cardiac and pulmonary function. [6] Defibrillation is indicated only in certain types of cardiac dysrhythmias, specifically ventricular fibrillation (VF) and pulseless ventricular tachycardia.
An automated external defibrillator or automatic electronic defibrillator (AED) is a portable electronic device that automatically diagnoses the life-threatening cardiac arrhythmias of ventricular fibrillation (VF) and pulseless ventricular tachycardia, [1] and is able to treat them through defibrillation, the application of electricity which stops the arrhythmia, allowing the heart to re ...
Defibrillation cannot be applied to asystole and CPR must be initiated first in this case. A similar concept, cardioversion, utilizes the same defibrillation machine but is used for other rhythms such as atrial fibrillation and supraventricular tachycardia. In these rhythms, the machine is "synchronized" to the QRS complex to avoid shocking on ...
While defibrillation is often portrayed as a common treatment option in popular media, since asystole is an unshockable rhythm defibrillation is not a recommended course of treatment. Successful resuscitation is generally unlikely and is inversely related to the length of time spent attempting resuscitation.
Defibrillation is effective only for certain heart rhythms, namely ventricular fibrillation or pulseless ventricular tachycardia, rather than asystole or pulseless electrical activity, which usually requires the treatment of underlying conditions to restore cardiac function. Early shock, when appropriate, is recommended.
There are multiple factors during cardiopulmonary resuscitation (CPR) and defibrillation that are associated with success of achieving return of spontaneous circulation. One of the factors in CPR is the chest compression fraction, which is a measure of how much time during cardiac arrest are chest compressions performed.
Defibrillation [21] — Defibrillation is the definitive treatment step for those cases of cardiac arrest that involve a shockable rhythm, or one correctable by defibrillation (pulseless unstable ventricular tachycardia, coarse or fine ventricular fibrillation; it will not work for asystole or pulseless electrical activity)
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