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IRE Transactions on Medical Electronics

Date Dec. 1957

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Displaying Results 1 - 25 of 25
  • [Front cover]

    Publication Year: 1957, Page(s): c1
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  • IRE Professional Group on Medical Electronics

    Publication Year: 1957, Page(s): nil1
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  • [Breaker page]

    Publication Year: 1957, Page(s): nil1
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  • [Table of contents]

    Publication Year: 1957, Page(s): 1
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  • History and Present Status of Phonocardiography

    Publication Year: 1957, Page(s):2 - 3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (399 KB)

    Phonocardiography originated in an attempt to time the occurrence of heart sounds in the cardiac cycle in relation to the mechanical activity of the heart, as recorded in the apex beat or in arterial pulsations. The method evolved from an era when the observer manually inserted a signal in a pulse tracing at the time he heard the sounds. Later, this was done by mechanical synchronous record, then ... View full abstract»

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  • Physiological Auscultatory Correlations: Heart Sounds and Pressure Pulses

    Publication Year: 1957, Page(s):4 - 5
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    Our knowledge of the cause of sounds arising in the heart has depended on indirect evidence of events of the cardiac cycle in man and direct observations made in other animals. The accessibility of the human heart for study in this era of cardiac surgery now permits the direct observation made in animals to be repeated in man and the indirect correlations to be confirmed. View full abstract»

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  • Discussion of Session I-A

    Publication Year: 1957, Page(s):6 - 7
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  • Does Cavitation Contribute to Cardiovascular Sounds?

    Publication Year: 1957, Page(s):8 - 10
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  • The Genesis of Musical Murmurs

    Publication Year: 1957, Page(s):11 - 12
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (445 KB)

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  • Transients in Heart Sounds and Murmurs

    Publication Year: 1957, Page(s):12 - 14
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    A new approach to the analysis of heart sounds and murmurs has been developed. These acoustic phenomena are considered to be generated by a series of transient sounds which because of the long persistence of the low-frequency components of the sounds, tend ordinarily to fuse into a single sound. The separate events such as valve closures which produce discrete clicks, therefore tend to fuse, and t... View full abstract»

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  • Discussion of Session I-B

    Publication Year: 1957, Page(s):15 - 16
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  • Quantitative Auscultation of Heart Sounds with Internal Calibration

    Publication Year: 1957, Page(s): 16
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  • Absolute vs Acoustic Standardization in Electrostethography and the Need for Studying Cardiac Vibrations As Transients

    Publication Year: 1957, Page(s):17 - 18
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (430 KB)

    The marked variations in the audiograms of the individuals and the wide variation in frequency response of different flexible stethoscopes preclude the possibility of any widespread system of standardization. Phonocardiography has well recognized teaching and clinical value but is limited in usefulness as a clinical tool. Electrostethography eliminates the use of auditory recordings and is a direc... View full abstract»

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  • Newer Studies of Selective Phonocardiography Including a New Method for the Identification of the Frequency Range of Extra Sounds

    Publication Year: 1957, Page(s):19 - 21
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    Problems dealing with the registration of either apical or basal diastolic murmurs of poor magnitude are discussed. Current methods of phonocardiography are reviewed. Eight normal subjects and thirty abnormal cases were studied by means of a variable band-pass filter with additional amplification. The various frequencies of the cardiac murmurs were analyzed. A band between 60 and 110 vibrations pe... View full abstract»

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  • Discussion of Session II-A

    Publication Year: 1957, Page(s):22 - 25
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  • Part I--Phonocatheters: Their Design and Application

    Publication Year: 1957, Page(s):25 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4891 KB)

    A miniature cylindrical barium titanate tubular element has been designed as an acoustic pickup and placed at the distal end of a specially designed catheter. The catheter is, in fact, an extension of the general design technique used to evolve underwater sound transducers used in antisubmarine warfare. Catheters have been designed in both single and double-lumen types, with provisions in the latt... View full abstract»

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  • Part II--Intracardiac Phonocardiography

    Publication Year: 1957, Page(s):31 - 34
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    Using specially designed catheters and amplifying equipment, studies of intracardiac sounds have been carried out in man at the time of cardiac catheterization. The catheters, either single- or double-lumen, are passed into the lesser circulation under fluoroscopic guidance. The first and second heart sounds are heard in the heart and in the great vessels leading to and from the heart. The first s... View full abstract»

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  • High-Sensitivity Capacitance Pickup for Heart Sounds and Murmurs

    Publication Year: 1957, Page(s):35 - 40
    Cited by:  Papers (1)
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    Exploration of heart murmur frequencies requires a pickup and associated electronics having great sensitivity and a wide range. Such a system, employing a capacitance principle, has been applied to reproduction of sounds from the precordium. The pickup is of the direct contact type, is relatively insensitive to extraneous noise, and is capable of recording murmurs of extremely low intensity. View full abstract»

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  • Evaluation of the Spectral Phonocardiographic Analysis

    Publication Year: 1957, Page(s):41 - 43
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    Heart sounds can be divided into three classes: short duration pulses (first and second heart sounds); broadband long duration noise (murmur); and long duration sounds having distinct harmonic pattern (musical murmurs). The characteristics of the analysis of these classes are illustrated, and the timing, duration, and filtering artifacts are discussed. A comparison between phase and amplitude filt... View full abstract»

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  • Instrumentation Problems in a High-Frequency Heart Sound Analyzer

    Publication Year: 1957, Page(s):44 - 47
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3761 KB)

    It is accepted generally in medical practice that the low-frequency vibrations (up to 600 cps) of heart sounds and murmurs contain virtually all the available information. Newer concepts have been proposed that these signals actually consist of irregularly occurring transients which comprise the important information regarding heart action. These transients can be analyzed by recording the frequen... View full abstract»

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  • Discussion of Session II-B

    Publication Year: 1957, Page(s): 48
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  • Evening Panel Discussion

    Publication Year: 1957, Page(s):49 - 53
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  • Standardization of Phonocardiography

    Publication Year: 1957, Page(s): 54
    Cited by:  Papers (2)
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  • Standardization of Phonocardiography: Efforts in the Netherlands

    Publication Year: 1957, Page(s): 55
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  • [Front cover]

    Publication Year: 1957, Page(s): c2
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Aims & Scope

This Transactions ceased publication in 1960. The current retitled publication is Biomedical Engineering, IEEE Transactions on

Full Aims & Scope