Pediatrics C.V.S e64bc315 Widely split S1 is heard in A Right bundle branch block (RBBB) B Mitral regurgitation (MR) C Atrial septal defect (ASD) D Ventricular septal defect (VSD) High-Yield Explanation In ASD there Will be widely fixed split S2. Ref : Ghai essential of pediatrics, eighth edition, p.no:413