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  Indian J Med Microbiol
 

Figure 3: “Simultaneous recording of the heart sounds (phonocardiogram), carotid arterial pulse tracing, and the electrocardiogram in a normal subject (paper speed, 100 mm/s; time markers, 0.02 s). QS2 = Total electromechanical systole; SlS2 = Heart sound interval; LVET = Left ventricular ejection time; and PEP = Preejection period” (adapted from: Circulation, Volume XXXVII, February 1968)

Figure 3:  “Simultaneous recording of the heart sounds (phonocardiogram), carotid arterial pulse tracing, and the electrocardiogram in a normal subject (paper speed, 100 mm/s; time markers, 0.02 s). QS2 = Total electromechanical systole; SlS2 = Heart sound interval; LVET = Left ventricular ejection time; and PEP = Preejection period” (adapted from: Circulation, Volume XXXVII, February 1968)