INVERSED RATIO VENTILATION (IRV) - ROLE OF INSPIRATORY EXSPIRATORY RATIO IN ARDS

  • 1 January 1980
    • journal article
    • research article
    • Vol. 29  (11) , 592-596
Abstract
Inverse ratio ventilation (IRV) was attempted in patients with ARDS [adult respiratory distress syndrome] and in postoperative cardiac surgical patients. An obvious improvement of gas transfer in the lung is seen and becomes better with increased duration of this type of ventilation. A better filling of various parts of the lung with longer time constants is achieved with prolonged inspiration. An effect similar to PEEP [positive end-expiratory pressure], caused by an air trapping mechanism, is seen with the shortening of expiration time. This air trapping mechanism is followed by autonomous adaption of PEEP for the local situation in various parts of the lung. A higher PEEP in poorly ventilated areas is automatically adjusted with IRV; this does not occur in areas with a short time constant (individual PEEP).

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