MS: Heart Sound
Heart Sounds: Stethoscope Listening Overview of Heart Sounds (lub-du ; lub, dub ) · lub - closure of AV valves, onset of ventricular systole · dub - closure of semilunar valves, onset of diastole Ø Tricuspid valve (lub) - RT 5th intercostal, medial Ø Mitral valve (lub) - LT 5th intercostal, lateral Ø Aortic semilunar valve (dub) - RT 2nd intercostal Ø Pulmonary semilunar valve (dub) - LT 2nd intercostals S1 - due to closure of the AV(mitral/tricuspid) valves - timing: beginning of systole - loudest at the apex S2 - due to the closure of the semi-lunar (pulmonic/aortic) valves - timing: diastole - loudest at the base S3 – Ventricular Diastolic Gallop...