Benedict Kingsley, M.Sc.; Edward Waxler, M.D.; Leonard Dreifus, M.D.; Bernard L. Segal, M.D.; Peter Green, M.T.
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A new noninvasive technique, octave band analysis, has been used for measuring objectively the sound level energy in decibels (db) and cutoff frequency in Hertz (Hz) of prosthetic valve sounds in 100 patients. The main components of this simple and portable system are a transducer, an octave band analyzer, a preamplifier, and an oscilloscope. The system is easily calibrated in decibels by using a vibration calibrator that applies to the transducer a mechanical force corresponding to an acceleration of 1 g at a frequency of 100 Hz. Frequency profiles (decibel versus frequency) have been plotted for normally functioning Starr-Edwards silastic
Kingsley B, Waxler E, Dreifus L, Segal BL, Green P. Electronic Evaluation of Prosthetic Cardiac Valve Performance.. Ann Intern Med. 1971;74:820. doi: 10.7326/0003-4819-74-5-820_3
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Published: Ann Intern Med. 1971;74(5):820.
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Print ISSN: 0003-4819 | Online ISSN: 1539-3704
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