CALIBRATION OF AN ELECTRONIC PHONOCARDIOGRAPH
نویسندگان
چکیده
منابع مشابه
Calibration of an electronic phonocardiograph.
Calibration of a phonocardiograph is more difficult than calibration of an electrocardiograph and the clinical value of the procedure is less obvious. The loudness of the heart sounds and murmurs at the front of the chest does not depend exclusively on cardiac activity but is influenced also by the position of the heart in the chest, by the nature and thickness of the chest wall, and by extrane...
متن کاملAn electronic phonocardiograph employing a double-beam cathode-ray oscillograph as the recording device.
A phonocardiograph employing a cathode-ray tube is the theoretical ideal since the natural frequency of the instrument is sufficiently high to avoid distortion of the vibrations to be recorded, the amplitude of the deflections is directly proportional to the movements which excite them, and the cathode-ray beam has minimal inertia and is fully damped. With any of the popular recording devices i...
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A study of the [C6 H6 Ir(PH3 )3 ]+ iridatropylium cation structure based on frontier orbital analysis, thermodynamic analysis, and natural bond orbital (NBO) theory is the main aim of the present research. Also, HOMO, LUMO energies, hardness, electrophilicity and chemical potential were calculated. Structural analysis indicated the optimized geometry shows a good agreement with the experimental...
متن کاملA multi-channel cathode-ray phonocardiograph.
The difficulties of recording the faint murmurs of early rheumatic valvulitis are well known, and for this reason it was considered advisable to develop a cathode-ray phonocardiograph. This is theoretically the ideal recording device owing to its minimal inertia and high sensitivity. This phonocardiograph is intended to provide objective confirmation of clinical findings on auscultation, record...
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Auscultation is used to evaluate heart health, and can indicate when it's needed to refer a patient to a cardiologist. Advanced phonocardiograph (PCG) signal processing algorithms are developed to assist the physician in the initial diagnosis but they are primarily designed and demonstrated with research quality equipment. Therefore, there is a need to demonstrate the applicability of those tec...
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ژورنال
عنوان ژورنال: Heart
سال: 1955
ISSN: 1355-6037
DOI: 10.1136/hrt.17.2.138