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Respiratory Care, Vol. 37

Excerpt from Respiratory Care, Vol. 37: July, 1992 Volume-cycled Decelerating Flow: An Alternative Form of Mechan ical Ventilation - SA Ravenscraft, WC Burke, JJ Marini. Chest 1992; The linerly decelerating flow wave form for volume-cycled mechanical ventilation is an option on many modern ventilators. We have devel oped mathematical models for two available forms of volume-cycled decelerating- ow ventilation (v cdf). These equations use clinician-chosen ventilator settings as inputs (fre queney, u'dal volume, peak inspir atory flow or inspiratory time frac tion, and end-inspiratory pause), and patient-determined inputs that describe the patient's ventilatory impedance (inspiratory [ri] and expiratory [re] resistance and res piratory system compliance The equations predict key outcome variables: mean airway pressure; and peak, mean, and end-expiratory alve olar pressures. The mathematical expressions were validated in a mechanical lung analog. Values observed in the test lung were com pared to values predicted by the mathematical models for a wide range of ventilator settings and impedance combinations (ri and RE 5 to 40 cm H20 s/l; C to L/cm H30). The correspondence between observed and predicted val ues was generally excellent across the broad range of inputs tested (r2098). Outcome variables were quite sensitive to clinician-chosen inputs over certain critical ranges. Carefully applied, vcdf offers sev eral theoretic advantages for the clin ical setting; however, appropriate caution must be exercised to avoid the application of tissue-injuring pressure. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."
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