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The value of phonomechanographic recordings has been contested in recent years. This seems to be the result of the upsurge in other non-invasive methods of investigating cardiac diseases and left ventricular function such as those based on ultrasound, pulsed Doppler or radioisotopes. Far from opposing these techniques, phonocardiography has benefited from their comparison and association which have validated the systolic time and amplitude indices previously used empirically.
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