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  • BIOSCIENCES  (11)
  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (3)
  • INSTRUMENTATION AND PHOTOGRAPHY  (2)
  • 1975-1979  (3)
  • 1970-1974  (13)
Collection
Keywords
Years
Year
  • 1
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    Alterations in left ventricular volumes induced by Valsalva manoeuvre (1974)
    In:  Other Sources
    Details
    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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    A diode-quad bridge circuit for use with capacitance transducers (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 44; Oct. 197
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  • 3
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    Evaluation of the pulse-contour method of determining stroke volume in man. (1972)
    In:  Other Sources
    Details
    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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  • 4
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    Action of acetylstrophanthidin on experimental myocardial infarction. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An experimental animal model with acute myocardial infarction of a size insufficient to produce profound heart failure or shock was used to study the effects of acute infarction on digitalis tolerance and the hemodynamic changes produced by moderate and large doses of acetylstrophanthidin. With acute myocardial infarction, digitalis toxic arrhythmias could be precipitated with significantly lower doses of digitalis than in animals without myocardial infarction. There was no precise correlation between the size of infarction and the toxic dose of glycoside. Coronary artery ligation produced a stable but relatively depressed circulatory state, as evidenced by lowered cardiac output and stroke volume and elevated systemic vascular resistance and left atrial mean pressure. When digitalis was infused, the following significant changes were observed at nontoxic doses: (1) elevation of aortic and left ventricular pressures; (2) further decline in cardiac output; and (3) decreased left atrial mean pressure.
    Keywords: BIOSCIENCES
    Type: American Journal of Physiology; 222; Feb. 197
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  • 5
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    Circulatory responses to hypoxia in experimental myocardial infarction. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Three levels of decreased arterial oxygen saturation elicited a graded circulatory response in dogs, manifested by stepwise increases in cardiac output, left ventricular dp/dt, and stroke volume, and decreases in systemic vascular resistance. Responses to similar hypoxia challenges after experimental myocardial infarction were qualitatively similar but quantitatively less. Although the circulatory compensation for hypoxia was less effective after myocardial infarction, no further deterioration of the haemodynamics was noted.
    Keywords: BIOSCIENCES
    Type: Cardiovascular Research; 5; Oct. 197
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  • 6
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    Diagnostic accuracy of an ultrasonic multiple transducer cardiac imaging system (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An ultrasonic multiple-transducer imaging system for intracardiac structure visualization is developed in order to simplify visualization of the human heart in vivo without radiation hazard or invasion of the body. Results of the evaluation of the diagnostic accuracy of the devised system in a clinical setting for adult patients are presented and discussed. Criteria are presented for recognition of mitral valva prolapse, mitral stenosis, pericardial effusion, atrial septal defect, and left ventricular dyssynergy. The probable cause for false-positive and false-negative diagnoses is discussed. However, hypertrophic myopathy and congestive myopathy were unable to be detected. Since only qualitative criteria were used, it was not possible to differentiate patients with left ventricular volume overload from patients without cardiac pathology.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: American Heart Journal; 90; Sept
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  • 7
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    Assessment of the synergistic relationship between serum calcium and digitalis (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Serum calcium-digitalis synergism effect on dogs heart excitability, noting hypoxia role in arrhythmia production
    Keywords: BIOSCIENCES
    Type: ; STITUTION OF ENGINEE
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  • 8
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    Action of pharmacologic agents in experimental cardiac tamponade (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Isoproterenol, atrial pacing, ouabain and methoxamine effects on dogs during experimental cardiac tamponade, observing arterial pressure, cardiac output and heart rate changes
    Keywords: BIOSCIENCES
    Type: ; ANSPORTURI AUTO, NAV
    Format: text
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  • 9
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    Cardiac chamber size and volume - Echographic measurement of cardiac chamber dimensions, volume and ventricular function (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
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  • 10
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    An improved method for echographic detection of left atrial enlargement (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Echographic dimensions of the aortic root and left atrium were compared in 170 patients in order to assess dilation of the left atrium with reference to the relatively nondistensible fibrous aortic root. In 50 patients without cause for left atrial or aortic enlargement, the ratio of left atrial/aortic root dimensions was 0.87 to 1.11. In 80 patients with known cause for left atrial enlargement, the left atrial/aortic root ratio was greater than or equal to 1.17. In 40 patients with isolated valve disease, dilation of both the aortic root and the left atrium resulted in a left atrial/aortic root dimension ratio less than 1.17 in some patients. Despite this consideration, the comparison of left atrial and aortic root dimension appears to be as specific as, and more sensitive than, previously proposed methods for the evaluation of left atrial enlargement.
    Keywords: BIOSCIENCES
    Type: Circulation; 50; July 197
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