Abstract
The prototype of a fully computerized servoventilator monitor was successfully used to support ventilation in 25 adult patients during a total of 2030 patient hours. This prototype is volume-cycled in active inspiration and time-cycled in the inspiratory pause. During time-cycled expiration, it functions as a constant atmospheric pressure generator, or constant positive-pressure generator if positive end-expiratory pressure is applied. From the information received through a pneumotachometer placed near the patient's airway, a microprocessor controls the mode of ventilation, and monitors and processes the ventilatory data. This computerized device has a high-security keyboard and a visual display screen. Ventilatory data are stored in a timed memory and presented on the screen. By measuring compliance and airway resistance with a standardized cycle, it is possible to define the patient's ventilatory mechanics by a mathematical model and predict the result of any proposed change in preset variables.
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