Commercially available ventilators offer combinations of ventilatory support modalities such as IMV+PSV, IMV+ATC, BiPAP+PSV, BiPAP+ATC, and PAV+ATC. Very few of these combinations of ventilatory modalities have been shown to be advantageous in the treatment of patients . In contrast, it remains doubtful whether simply combining different modalities of ventilation results in the addition of their positive effects . It cannot be ruled out that proven physiological effects of one mode of ventilation might be minimized or even abolished by combining it with another method.
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