Systolic pressure gradient across aoic valve is elevated in –
The question is asking when the systolic pressure gradient across the aortic valve is elevated. I remember that aortic stenosis is a condition where the aortic valve becomes narrowed, which causes increased resistance to blood flow from the left ventricle into the aorta. This would result in a higher pressure gradient during systole because the ventricle has to generate more pressure to push blood through the narrowed valve.
Other possibilities might include conditions like aortic regurgitation, but in that case, the gradient might not be elevated during systole because the valve is incompetent, leading to backflow rather than obstruction. Hypertension could increase afterload but not necessarily create a gradient across the valve itself. Hypertrophic cardiomyopathy might cause a dynamic gradient, but that's more during systole due to outflow tract obstruction, which is different from aortic stenosis.
So the correct answer is likely aortic stenosis. Now, I need to structure the explanation according to the user's guidelines. The core concept here is the pathophysiology of aortic stenosis leading to a pressure gradient. The explanation should detail how the stenosis causes the gradient, and why other options are incorrect. The clinical pearl could be that a systolic ejection murmur is a classic sign of aortic stenosis. Finally, confirm the correct answer as option C, assuming that's where the answer was intended to be.
**Core Concept**
The systolic pressure gradient across the aortic valve is elevated in conditions causing left ventricular outflow tract obstruction. Aortic stenosis, characterized by narrowing of the aortic valve orifice, creates a significant pressure gradient during systole due to increased resistance to blood flow.
**Why the Correct Answer is Right**
In **aortic stenosis**, the narrowed aortic valve orifice (often 50 mmHg with symptoms (e.g., angina, syncope) indicates severe disease requiring intervention.