A Computerized Method for Instantaneous and Continuous Measurements of Expired Nitrogen PDF Download
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Author: John Abajian
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Author: John Abajian
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Author: Richard A. Anderson
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Category :
Languages : en
Pages : 66
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Current research applications of a computerized method for instantaneous and continuous measurements of expired nitrogen are presented. Projects already completed, now in progress and being implemented include: (1) evaluation of intrapulmonary gas distribution in patients with various types of pulmonary disease; (2) definition and classification of nitrogen washout patterns in patients with various types of cardiac disease; (3) study of intrapulmonary distribution of respired gas and pulmonary mechanics during induced pulmonary vascular congestion in the rabbit; (4) investigation of pulmonary mechanics and washout patterns in the rabbit following papain destruction of the lung's parenchymal meshwork; (5) delineation of changes in washout patterns during ventilation with varying tidal volume, respiratory frequency and inspiratory flow rates; (6) definition of newborn infants' nitrogen washout patterns and lung volumes; the defects of intrapulmonary gas distribution encountered in the respiratory distress syndrome of the newborn; and (7) longitudinal study of washout characteristics in a group of patients with chronic bronchitis with particular reference to development of chronic obstructive emphysema. (Author).
Author: John Abajian
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ISBN:
Category : Nitrogen
Languages : en
Pages : 70
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The basis for the on-line study of pulmonary nitrogen washout by hybrid computer is presented. The instrument produces a semilogarithmic plot of nitrogen concentration in expired gas versus cumulative alveolar ventilatory volume. Simultaneous measurements of functional residual capacity and main conducting airway volume are also recorded. Comparison of conventional washout methods and computer technique proved the validity of the computer. Secondly, a new index of intrapulmonary gas distribution is devised. The index (IDI or Inspired Gas Distribution Index) is quite sensitive to any change of the gas distribution in the lung and has a very small physiological variation (1.8 plus or minus 0.2). As one application of this computer in research, the effect of expiratory obstruction in normal subjects is studied. A 5 mm. diameter obstruction does not affect the gas distribution in the supine position, whereas the obstruction has a striking effect on gas distribution when a subject is exercising in the upright position. (Author).
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Category : Aeronautics
Languages : en
Pages : 334
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Category : Medicine
Languages : en
Pages : 928
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Category : Aviation medicine
Languages : en
Pages : 524
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Category : Aviation medicine
Languages : en
Pages : 72
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ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 750
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 670
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Author:
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ISBN:
Category : Nuclear science abstracts
Languages : en
Pages : 1492
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