True about third hea sound is-
The third hea sound (S 3 ) occurs during the rapid filling phaseof ventricular diastole. It can be a normal finding in children,adolescents, and young adults; however, in older patients it signifieshea failure. A left-sided S 3 is a low-pitched sound best heard overthe left ventricular (LV) apex. A right-sided S 3 is usually betterheard over the lower left sternal border and becomes louder withinspiration. A left-sided S 3 in patients with chronic hea failure ispredictive of cardiovascular morbidity and moality. Interestingly,an S 3 is equally prevalent among hea failure patients with andwithout LV systolic dysfunction.Harrison's principle of internal medicine,20edition,pg no.1554
Present in constrictive pericariditis
Absent in aoic aneurysm
Absent in MS
Present in cardiac yamponade
C.V.S