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  • 1
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    Alterations in left ventricular volumes induced by Valsalva manoeuvre (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Five patients were studied with left ventriculography during different phases of the Valsalva manoeuvre. Small doses of contrast medium allowed adequate repetitive visualization of the left ventricle for volume calculation. During strain phase, the volume of the left ventricle decreased by nearly 50 per cent in each case, and stroke volume and cardiac output also dropped strikingly. Release of straining was attended by a sharp rebound of left ventricular volume to control levels, with a transient surge of increased cardiac output 42 per cent above that of the resting state.
    Keywords: BIOSCIENCES
    Type: British Heart Journal; 36; July 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Evaluation of the pulse-contour method of determining stroke volume in man. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The pulse-contour method for determining stroke volume has been employed as a continuous rapid method of monitoring the cardiovascular status of patients. Twenty-one patients with ischemic heart disease and 21 patients with mitral valve disease were subjected to a variety of hemodynamic interventions. The pulse-contour estimations, using three different formulas derived by Warner, Kouchoukos, and Herd, were compared with indicator-dilution outputs. A comparison of the results of the two methods for determining stroke volume yielded correlation coefficients ranging from 0.59 to 0.84. The better performing Warner formula yielded a coefficient of variation of about 20%. The type of hemodynamic interventions employed did not significantly affect the results using the pulse-contour method. Although the correlation of the pulse-contour and indicator-dilution stroke volumes is high, the coefficient of variation is such that small changes in stroke volume cannot be accurately assessed by the pulse-contour method. However, the simplicity and rapidity of this method compared to determination of cardiac output by Fick or indicator-dilution methods makes it a potentially useful adjunct for monitoring critically ill patients.
    Keywords: BIOSCIENCES
    Type: Circulation; 46; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Clinical application of a light-pen computer system for quantitative angiography (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The important features in a clinical system for quantitative angiography were examined. The human interface for data input, whether an electrostatic pen, sonic pen, or light-pen must be engineered to optimize the quality of margin definition. The computer programs which the technician uses for data entry and computation of ventriculographic measurements must be convenient to use on a routine basis in a laboratory performing multiple studies per day. The method used for magnification correction must be continuously monitored.
    Keywords: AEROSPACE MEDICINE
    Type: Soc. of Photo-Opt. Instrumentation Engrs. Cardiovascular Imaging and Image Processing; p 209-216
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Clinical application of a light-pen computer system for quantitative angiography (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The paper describes an angiographic analysis system which uses a video disk for recording and playback, a light-pen for data input, minicomputer processing, and an electrostatic printer/plotter for hardcopy output. The method is applied to quantitative analysis of ventricular volumes, sequential ventriculography for assessment of physiologic and pharmacologic interventions, analysis of instantaneous time sequence of ventricular systolic and diastolic events, and quantitation of segmental abnormalities. The system is shown to provide the capability for computation of ventricular volumes and other measurements from operator-defined margins by greatly reducing the tedium and errors associated with manual planimetry.
    Keywords: AEROSPACE MEDICINE
    Type: Conference on Cardiovascular imaging and image processing: Theory and practice - 1975; Jul 10, 1975 - Jul 12, 1975; Stanford, CA
    Format: text
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    NASA TECHNICAL REPORTS
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