Valsalva's maneuver

例句：

1. 1. During the operation, the surgeon used a Valsalva maneuver to control bleeding.
   手术期间，外科医生使用瓦萨瓦尔操作来控制出血。
2. 2. After the heart attack, he underwent a Valsalva maneuver to stabilize his heart rhythm.
   心脏病发作后，他接受了瓦萨瓦尔操作以稳定他的心律。
3. 3. The anesthesiologist performed a Valsalva maneuver during the procedure to prevent air from entering the patient's lungs.
   麻醉师在手术过程中执行了瓦萨瓦尔操作，以防止空气进入患者的肺部。