Medicine All of the following statements about third Hea sound (S3) are true, except A Occurs due to rapid filling of the ventricles during atrial systole B Seen in in constrictive pericarditis C Seen in Atrial Septal Defect (ASD) D Seen in Ventricular Septal Defect (VSD) 💡 Explanation All of the following statements about third Hea sound (S3) are true, except ✓ Correct Answer: A. Occurs due to rapid filling of the ventricles during atrial systole