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      ?????,P-R ??0.24s,??0.65%~1.1%,50 ??1.3%.
 ?,?????8.7%.???,?,?,,????,??,??P-R ?.
??P-R ????,??.?.
???????,????,????4%~15%,??.??,??????,?,.???,??????.????????,???.

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