Conclusion The hypothermia,extracorporeal circulation,clamp of aorta and drugs,etc.can lead to decrease of HRV in cardiac surgery.The resume of autonomic cardioneural system was a slow process.
结论
手术、体外循环、低温、主动脉阻断及药物因素可导致率变异性下降，而术
自主
经系
复是一个缓慢过程。
经
Conclusion The hypothermia,extracorporeal circulation,clamp of aorta and drugs,etc.can lead to decrease of HRV in cardiac surgery.The resume of autonomic cardioneural system was a slow process.
结论手术、体外循环、低温、主动脉阻断及药物因素可导致率变异性下降，而术自主经系复是一个缓慢过程。
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