Objective: to expound the mechanism of Valsalva maneuver to treat supraventricular tachycardia.
目的：为阐明瓦氏动作在终止室上速过程的作用机制。
Instruct clients with history of cardiovascular disease to exhale during defecation (Valsalva maneuver can cause cardiac arrest).
嘱有心脏病史病人排便时呼气(瓦尔·萨尔瓦操作会导致心脏停博)。
It often presents as a soft painless mass, especially in pediatric populations and its appearance may sometimes be altered by position and when performing the Valsalva maneuver.
尤其是在儿童中，通常表现为无痛性软组织肿块，当做瓦尔·萨尔瓦动作或者姿势改变时，可以发生形态的改变。
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