心率过快时,心输出量减少的主要原因是
2023-05-30
A.心房收缩期缩短
B.等容收缩期缩短
C.等容舒张期缩短
D.心室充盈期缩短
参考答案:D
B.等容收缩期缩短
C.等容舒张期缩短
D.心室充盈期缩短
参考答案:D
生理P97。心率在一定范围内变化时,每分输出量与心率成正比;但当心率超过160 ~180次/分时,将使心室舒张期明显缩短,心室舒张期充盈量明显减少,因此搏出量也明显减少,从而导致心输出量下降。
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