What is the dupp sound of a heart contraction?

First heart sound (S1): The first heart sound, also known as the "lubb" sound, is caused by the closure of the mitral and tricuspid valves at the beginning of systole. It is louder at the apex of the heart and is best heard with the stethoscope placed at the mitral area. The first heart sound is associated with the onset of ventricular contraction and the ejection of blood into the aorta and pulmonary artery.

Second heart sound (S2): The second heart sound, also known as the "dup" sound, is caused by the closure of the aortic and pulmonary valves at the end of systole. It is louder at the base of the heart and is best heard with the stethoscope placed at the aortic and pulmonary areas. The second heart sound is associated with the end of ventricular contraction and the recoil of the great arteries.

The dupp sound of a heart contraction refers to the second heart sound (S2).