患者，男，37岁，因急性高血压（220／120mm hg）和不稳定性室性心动过速（需要心脏电复律）而入院，患者既往无不适。1年前的经胸超声心动图检查（tte）显示：二尖瓣脱垂伴中度二尖瓣返流（mr），左心室（lv）大小和功能正常，右心室（rv）轻度扩大。完成机构：[1]department of anesthesiology and critical care, va boston healthcare system andmassachusetts general hospital, harvard medical school [2]department of anesthesia and critical care, beth israel deaconess medical center, harvard medical school [3]department of cardiology, va boston healthcare system and boston university medical center [4]department of anesthesiology, boston university medical center, boston university school of medicine boston, massachusetts [5]不详