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??I.II????

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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?,?????8.7%.???,?,?,,????,??,??P-R ?.
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????????????? ???V1rSR\'?V5V6S?QRS??0.11???????????????????????????????????

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