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Pericardial friction rub in a child following cardiac surgery

Pericardial friction rub in a child following cardiac surgery
Phonocardiogram recorded along left sternal border 1 day after cardiac surgery in an 8-year-old child. There is a pericardial friction rub present in both systole and diastole.
S1: first heart sound; S2: second heart sound.
Graphic 104793 Version 3.0