What does a widened pulse pressure indicate in aortic regurgitation?

What does a widened pulse pressure indicate in aortic regurgitation?

• A. Large difference between systolic and diastolic pressures due to regurgitant flow causing diastolic drop and systolic rise.
• B. Narrowing of pulse pressure due to decreased stroke volume.
• C. High diastolic pressure with low systolic.
• D. No change in pulse pressure.

Answer: (D)

Widened pulse pressure in aortic regurgitation happens because the regurgitant flow causes a large gap between systolic and diastolic pressures. During diastole, blood leaks backward from the aorta into the left ventricle, pulling the aortic diastolic pressure down. At the same time, the ventricle responds by increasing stroke volume, which can raise the systolic pressure. The combination is a high systolic pressure paired with a low diastolic pressure, producing a noticeably widened pulse pressure. This pattern isn’t seen with a narrowed pulse pressure, which occurs when stroke volume is reduced or systemic vascular resistance is high. It also doesn’t fit a scenario where diastolic pressure remains high with low systolic, or where there’s no change at all.

Widened pulse pressure in aortic regurgitation happens because the regurgitant flow causes a large gap between systolic and diastolic pressures. During diastole, blood leaks backward from the aorta into the left ventricle, pulling the aortic diastolic pressure down. At the same time, the ventricle responds by increasing stroke volume, which can raise the systolic pressure. The combination is a high systolic pressure paired with a low diastolic pressure, producing a noticeably widened pulse pressure.

This pattern isn’t seen with a narrowed pulse pressure, which occurs when stroke volume is reduced or systemic vascular resistance is high. It also doesn’t fit a scenario where diastolic pressure remains high with low systolic, or where there’s no change at all.