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Short systolic murmur in a child with a small muscular ventricular septal defect

Short systolic murmur in a child with a small muscular ventricular septal defect
Phonocardiogram recorded at the left lower sternal border in a 6-year-old child with a small apical muscular ventricular septal defect. The SM is short and does not extend to S2.
S1: first heart sound; S2: second heart sound; SM: systolic murmur.
Graphic 104799 Version 2.0