Which of the following ventilator modes is based on the equation of motion and delivers pres-sure, flow, and volume dependent on the patient's inspiratory effort?

a. Proportional assist ventilation
b. Mandatory minute ventilation
c. Airway pressure-release ventilation
d. Pressure-controlled continuous mandatory ventilation

ANS: A
The operation of proportional assist ventilation is based on the equation of motion. The amount of pressure generated by the patient's own respiratory muscles is used as an index of inspiration effort.