The IMV Controversy: Full VS Partial Ventilatory Support
Following World War 2, the design of most positive pressure ventilators was such that the patient was unable to spontaneously breathe and ventilation was totally controlled by the machine. Such control mode ventilation (CMV) often required heavy sedation and paralysis to stabilize cardio-pulmonary function. The development of assist mode ventilation (AMV) allowed the patient to initiate the positive pressure breaths and in most circumstances required less sedation and paralysis. With both CMV and AMV, the ventilator provides all the energy required to maintain effective alveolar ventilation — a circumstance that may be termed “full ventilatory support”.
KeywordsContinuous Positive Airway Pressure Tidal Volume Ventilatory Support Positive Pressure Ventilator Adult Respiratory Distress Syndrome
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