The nurse is using a stethoscope to listen to a patient's heart sounds. The nurse recognizes that the "dupp" of the characteristic "lubb-dupp" heart sound indicates what part of the cardiac cycle?

Question

Quizplus · Accepted Answer

The "dupp" sound of the "lubb-dupp" heart sound indicates the closure of the aortic and pulmonary semilunar valves, which occurs at the end of systole (contraction phase) when the ventricles are emptying blood into the aorta and pulmonary artery. This closure of the valves prevents backflow of blood into the ventricles.

The Nurse Is Using a Stethoscope to Listen to a Patient's