When is a diastolic murmur typically heard in relation to the pulse?

When is a diastolic murmur typically heard in relation to the pulse?

• A. Before the pulse
• B. After the pulse
• C. During systole
• D. Throughout respiration

Answer: (B)

A diastolic murmur is typically heard after the pulse because it reflects the blood flow dynamics during the diastolic phase of the cardiac cycle, which occurs when the heart is in relaxation and filling with blood. During this time, as the aortic valve closes, any regurgitation through the mitral or tricuspid valves, or turbulence through the great vessels, can produce a sound identifiable as a diastolic murmur. In comparison, the systolic phase precedes diastole, thus a murmur heard during this phase would not classify as a diastolic murmur. It is also important to note that murmurs are not consistently heard throughout respiration; rather, they correlate more specifically with the heart's filling phases, which occur after the pulse has been felt due to the closure of valves and flow dynamics in the heart and vessels. Therefore, recognizing that a diastolic murmur is a result of events in the cardiac cycle directly following the end of the pulse helps clarify why it is heard after the pulse occurs.

A diastolic murmur is typically heard after the pulse because it reflects the blood flow dynamics during the diastolic phase of the cardiac cycle, which occurs when the heart is in relaxation and filling with blood. During this time, as the aortic valve closes, any regurgitation through the mitral or tricuspid valves, or turbulence through the great vessels, can produce a sound identifiable as a diastolic murmur.

In comparison, the systolic phase precedes diastole, thus a murmur heard during this phase would not classify as a diastolic murmur. It is also important to note that murmurs are not consistently heard throughout respiration; rather, they correlate more specifically with the heart's filling phases, which occur after the pulse has been felt due to the closure of valves and flow dynamics in the heart and vessels. Therefore, recognizing that a diastolic murmur is a result of events in the cardiac cycle directly following the end of the pulse helps clarify why it is heard after the pulse occurs.