Most common cause of death in aoic stenosis patients is: March 2005
**Core Concept**
Aortic stenosis is a valvular heart disease characterized by the narrowing of the aortic valve opening, leading to increased resistance against which the left ventricle must pump blood. This condition can result in various complications, including heart failure, arrhythmias, and sudden cardiac death.
**Why the Correct Answer is Right**
The most common cause of death in patients with aortic stenosis is sudden cardiac death, often due to ventricular arrhythmias. This is thought to occur when the aortic valve is severely narrowed, leading to a significant increase in left ventricular end-diastolic pressure and a corresponding decrease in coronary blood flow. The resulting ischemia can trigger life-threatening arrhythmias, such as ventricular tachycardia or fibrillation. The risk of sudden cardiac death is particularly high in patients with severe aortic stenosis, especially those with symptoms such as angina or syncope.
**Why Each Wrong Option is Incorrect**
* **Option A:** Although heart failure is a common complication of aortic stenosis, it is not the most common cause of death in these patients. While heart failure can lead to sudden cardiac death, it is often a more gradual process.
* **Option B:** Myocardial infarction is a possible complication of aortic stenosis, but it is not the most common cause of death in these patients. The increased risk of myocardial infarction is thought to be related to the decreased coronary blood flow caused by the narrowed aortic valve.
* **Option C:** Sepsis is not a direct complication of aortic stenosis and is therefore not the most common cause of death in these patients.
**Clinical Pearl / High-Yield Fact**
In patients with aortic stenosis, the risk of sudden cardiac death is highest when symptoms such as angina or syncope are present. Clinicians should carefully assess these patients for signs of severe aortic stenosis and consider urgent intervention, such as aortic valve replacement.
**Correct Answer: B. Myocardial infarction is a possible complication of aortic stenosis, but it is not the most common cause of death in these patients. The increased risk of myocardial infarction is thought to be related to the decreased coronary blood flow caused by the narrowed aortic valve.**