THE MERCK MANUAL: The Merck Manual of Diagnosis and Therapymultimedia

Location(s)

  • Cardiovascular Examination
  • Split 2nd Heart Sound

    Sound is that of S1-S2 at rest (“out”) and S1-A2-P2 with inspiration (“in”). S2 splits with inspiration because intrathoracic pressure decreases, drawing more blood into the right ventricle and postponing pulmonic valve closure.

    Recording provided by Jules Constant, MD.

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