The leading cause of sudden mortality following myocardial infarction is____________?
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Answer: B. Arrhythmias
Explanation
Ischemic myocardial tissue disrupts normal electrical conduction pathways within the heart ventricles. Ventricular fibrillation and other lethal arrhythmias frequently occur within the first hours after infarction. These sudden electrical instabilities prevent effective cardiac output and cause rapid mortality. Coronary artery occlusion deprives heart muscle cells of oxygen, triggering lethal electrophysiological disturbances. Malignant ventricular tachyarrhythmias are responsible for the majority of pre-hospital cardiac deaths. Rapid defibrillation is the single most effective intervention for restoring a normal cardiac rhythm.
Emergency medical services prioritize rapid transport and ECG monitoring to manage post-infarction arrhythmias. Public access defibrillators save lives by treating sudden cardiac arrest caused by ventricular fibrillation. Cardiologists utilize prophylactic medications to reduce electrical irritability in high-risk cardiac patients. Pulmonary embolism can cause sudden death, but it is less common than arrhythmias following myocardial infarction. Congestive heart failure develops over days to weeks rather than triggering immediate sudden mortality. None of the alternative complications match the rapid lethality of acute post-infarction ventricular arrhythmias.
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