Korean J Anesthesiol.  1990 Aug;23(4):568-572. 10.4097/kjae.1990.23.4.568.

The Different Inspiratory Pressure Waves in Variuos I:E Ratio : Comparison of the Oxygenation and Ventilation in F1O2 1.0

  • 1Department of Anesthesiology, College of Mediciene, Seoul National University, Seoul, Korea.


The effect of alterations in the respiratory pressure wave forms in various I:E ratio during mechanical ventilation were studied in 9 children who had received open heart surgery. The patients were ventilated at I:E ratio of 1:3, 1:2, 1:1, 2:1 and 3:1 and wave forms of aeeelerating triangular, rectangular and decelerating triangular at random order. The minute ventilation and peak inspiratory pressure were remained constant. The F was 1.0. In this study, the only positive findings were that the use of rectangular and decelerating triangular wave form in I:E ratio of 1:2 resulted in decreased alveolar-arterial oxygen difference, 23.6% and 21. 1%, respectively, compared with the wave form of accelerating triangular.


Pressure Wave; I:E Ratio; Oxygenation; Ventilation
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