first sound: closure of AV valves, indicates the beginning of ventricular systole
ejection sound:
systolic ejection click: this is an early systolic high pitched sound heard over the aortic area - may occur in cases of congenital sclerosis where the aortic valve remains mobile
non-ejection systolic click: high pitched sound heard during systle and best heard over the mitral area; may occur in mitral valve prolapse
second sound: closure of semilunar valves, marks the beginning of diastole, which is generally longer than systole
opening snap: opening of abnormal AV valves; occurs at a variable distance after the second sound
third sound: ventricular filling (beginning); mid - diastolic heart sound
fourth sound: ventricular filling with atrial contraction; late diastolic heart sound
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