The Most Common Cause Of Sudden Cardiac Death Within One Hour After Onset Of First Symptoms In A 50-Year-Old Man Is

The Most Common Cause Of Sudden Cardiac Death Within One Hour After Onset Of First Symptoms In A 50-Year-Old Man Is

• A. Aortic Valve Stenosis
• B. Mitral Valve Prolapse
• C. Cardiomyopathy
• D. Myocardial Ischemia

Answer: (D)

The key idea is that sudden cardiac death within the first hour of symptoms in an adult with new chest pain is most often driven by acute myocardial ischemia from a sudden coronary occlusion. This ischemia creates electrical instability in the heart, leading to malignant arrhythmias such as ventricular fibrillation, which can cause rapid death. While valve problems like aortic stenosis or mitral valve prolapse and underlying cardiomyopathy can cause sudden death, they are less likely to be the immediate cause right at the onset of symptoms in this scenario. Aortic stenosis usually produces exertional symptoms and a progressive course; mitral valve prolapse can cause arrhythmias but is less common in a 50-year-old presenting with acute ischemic-type chest pain; cardiomyopathy predisposes to arrhythmias but the acute, ischemia-driven mechanism is more likely to produce death within an hour of symptom onset.

The key idea is that sudden cardiac death within the first hour of symptoms in an adult with new chest pain is most often driven by acute myocardial ischemia from a sudden coronary occlusion. This ischemia creates electrical instability in the heart, leading to malignant arrhythmias such as ventricular fibrillation, which can cause rapid death.

While valve problems like aortic stenosis or mitral valve prolapse and underlying cardiomyopathy can cause sudden death, they are less likely to be the immediate cause right at the onset of symptoms in this scenario. Aortic stenosis usually produces exertional symptoms and a progressive course; mitral valve prolapse can cause arrhythmias but is less common in a 50-year-old presenting with acute ischemic-type chest pain; cardiomyopathy predisposes to arrhythmias but the acute, ischemia-driven mechanism is more likely to produce death within an hour of symptom onset.