—Excuse me. How much is the shirt?

— _______.

A．Extra Large

B．50 each

C．It sells well

D．Altogether there are 5

患者女性，46岁。诊断为风湿性心脏病、二尖瓣关闭不全、心功能3级，拟行二尖瓣替换术。

术中判断心功能最有意义的监测是()

A．热稀释漂浮导管

B．血气分析

C．收缩压

D．气道阻力

E．CVP