Additional Pulmonary Valve Closure Caused by the Catheter and Demonstrated by the Intracardiac Phonocardiogram.


Simultaneous recording of intracardiac pressures and heart sounds has been made possible by the introduction of a high-frequency micromanometer developed by Soulie et al. (1954). Using this technique Soulie et al. (1961) have reported their findings in congenital and acquired heart disease. Analysing the second heart sound in recordings from the pulmonary… (More)

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