患者，男，37歲，因急性高血壓（220／120mm hg）和不穩(wěn)定性室性心動過速（需要心臟電復(fù)律）而入院，患者既往無不適。1年前的經(jīng)胸超聲心動圖檢查（tte）顯示：二尖瓣脫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）輕度擴(kuò)大。完成機(jī)構(gòu)：[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]不詳