???

1????P-R>0.20??P?QRS?.

2???????P?QRS??2:1;3:2;4:3????????????????

(1)???-P-R??P?R-R??P;?PR-R?P-P???

(2)???????P-R???QRS???????1:1;2:1;3:1;3:2;4:3??QRS????

????????????QRS?;?????????QRS??

??,?????.???:?`??`?.???,`????.????`???`?`?`?.,???.?????,.
????????,??????,???.
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1.??????????????????????????
2.???I???50/???????????
3.???????: (1)???????????? (2)?-??
4.???????
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????????

?????????????????????????0.3mg23 /d ??100200mg23 /d ??P-R ?????P-R ???????-????????????????????????????????????????????????????????P-R ????H-V ?(60ms)???.
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??????????????????????????????????????????????????????????????????,?????????
????????????Y??????

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??N????????????????????????????