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The mechanism of splitting of the second heart sound in atrial septal defect
1977
Circulation
The mechanism underlying the width of splitting of the second heart sound (S,) was investigated in 27 patients with ostium secundum atrial septal defect (ASD), all of whom had significant left to right shunting. Micromanometer catheters were used to record simultaneous high fidelity right ventricular (RV) and pulmonary arterial (PA) pressures. Electrocardiogram and external phonocardiograms were recorded simultaneously with pressures. QP" QA, and Q-RV intervals were measured from the onset of
doi:10.1161/01.cir.56.6.1047
pmid:923043
fatcat:57x7jtrh2ngq3ptfgrrctgjf54