2、缓慢型心律失常Cardiovascular disorder 心动过缓Bradycardia,S-A(sinoatrial node) blockade,A-V blockade by hyperfunction(机能亢进) of vagal nerves Attention: too large dose induce the increase of HR and oxygen consumption and increase the risk of ventricular(心蜜)fibrillation(纤维颜动).心动过缓Bradycardia， S-A(sinoatrial node ) blockade，A-V blockade by hyperfunction (机能亢进) of vagal nerves 2、缓慢型心律失常Cardiovascular disorder Attention: too large dose ：induce the increase of HR and oxygen consumption and increase the risk of ventricular(心室） fibrillation（纤维颤动）