[The study of AutoFlow role in volume controlled ventilation].

Objective: To evaluate the efficacy and safety of automatic variable flow rate (AutoFlow) for volume control ventilation through monitoring the number of ventilator alarm.

Methods: Forty-eight adult patients receiving the Drager Evita 4 ventilator with an expectation of more than 2 days duration were divided into two groups by randomly digital methods, each n=24. The patients in control group were received routinely mode with synchronized intermittent mandatory ventilation (SIMV), and the others in observation group were given SIMV and assist with AutoFlow.