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Normal Heart Sound
Manage episode 313651257 series 3279691
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The main normal heart sounds are the S1 and the S2 heart sound. The S3 can be normal, at times, but may be pathological. The first heart sound (S1) results from the closing of the mitral and tricuspid valves. The sound produced by the closure of the mitral valve is termed M1, and the sound produced by closure of the tricuspid valve is termed T1. The M1 sound is much louder than the T1 sound due to higher pressures in the left side of the heart; thus, M1 radiates to all cardiac listening posts (loudest at the apex), and T1 is usually only heard at the left lower sternal border. This makes the M1 sound the main component of S1.
The second heart sound is produced by the closure of the aortic and pulmonic valves. The sound produced by the closure of the aortic valve is termed A2, and the sound produced by the closure of the pulmonic valve is termed P2. The A2 sound is normally much louder than the P2 due to higher pressures in the left side of the heart
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