RN Nursing · Critical Cardiac Dysrhythmias · Practice question
How should a nurse interpret the finding of an asystolic rhythm in a patient?
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As equivalent to ventricular fibrillation.
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✓
As a terminal rhythm requiring immediate action.
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As an indication for immediate defibrillation.
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As a sign of mild cardiac electrical dysfunction.
Answer & explanation
Correct: As a terminal rhythm requiring immediate action.
Asystole is the complete absence of electrical activity in the heart, appearing as a flat or nearly flat line on the cardiac monitor. It represents cardiac standstill and is considered a terminal rhythm because it indicates the heart has ceased all electrical and mechanical activity. It requires immediate action, including high-quality CPR and administration of epinephrine per ACLS protocol, along with identification and treatment of reversible causes (the Hs and Ts). Asystole is not equivalent to ventricular fibrillation; ventricular fibrillation involves chaotic electrical activity and is treated with defibrillation. Critically, asystole is not an indication for defibrillation — shocking a flat line will not produce a beneficial result and is contraindicated. The mistaken belief that defibrillation is appropriate for asystole is a common and dangerous error students make. Asystole is also not a sign of mild cardiac electrical dysfunction; it is the most severe rhythm possible, indicating complete cardiac arrest. Recognizing asystole correctly and responding with CPR plus vasopressors rather than defibrillation is essential knowledge for any nurse working in clinical settings where cardiac monitoring is used.
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