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1?SVT????
  1????atrioventricularnodereentrytachycardiaAVNRT???????
    2???atrioventricularreentrytachycardiaAVRT???????accessorypathways?????????? ???Wolff-Parkinsion-WhitesyndromeW-P-W???Kent???90%?????10%??????QRS ??concealedpreexcitation?????? ?PR??????James?????????PR?? ??????Mahaim????????????? ?????permanentjunctionalreciprocatingtachycardiaPJRT?????????????????RP???RP???????????        3????sinusnodereentrytachycar...