Understanding Heart Sounds! As doctors, mastering auscultation is key to early diagnosis. Let's quickly review the normal and abnormal heart sounds: S1 (Lub): Marks the closure of the mitral and tricuspid valves, signifying the start of systole. S2 (Dub): Marks the closure of the aortic and pulmonary valves, signifying the start of diastole. 🚨 Now, for the pathological ones: S3 (Ventricular Gallop): In adults, often a sign of left ventricular failure, caused by rapid ventricular filling in earl