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《Journal of Liaoning Medical University》 2008-01
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The Investigation of the PJ Intervals in Patients with the Preexcitation Syndrome Combining with AVB or BBB

LIU Renguang XU Zhaolong SUN Kai ZHANG Yingjie LU Zhao The Cardiovascular Institute of the First Affiliated Hospital,Liaoning Medical University,Jinzhou 121001 China  
Objective This thesis aims to investigate the affected PJ intervals in patients with the preexcitation syndrome when combining with BBB or AVB.Methods The manifestation of ECGs compared between the occurrence of the typical preexcitation syn- drome and the period after receiving ablation accessory pathway(AP)were retrospectively reviewed in 12 patients with preexcitation syndrome combining with BBB or AVB(10 individuals received ablation AP and 2 individuals with intermittent preexcitation).The PJ intervals influenced by the conduction and location of AP were investigated by measuring the duration of PR intervals,QRS complexes (morphologies)and PJ intervals.Results(1)The duration of PJ intervals of all 12 patients(8 and 4 individuals in combination with BBB and the first degree AVB respectively)were prolonged after ablation AP(0.28~0.36s).(2)When the typical preexcita- tion occurred,the duration of the PJ intervals of 12 patients after ablation AP were shortened to differential extents(0.02~0.12s) and that of 4 patients remained more than 0.24 s after the shortened PJ intervals(0.28~0.30s)in the first degree AVB.The preex- citation syndrome combining with BBB was concerned with the location of AP.The duration of PJ intervals was shortened to the normal range(0.22~0.25s)when AP and BBB(6 individuals)were homolateral and 0.27s(an individual)and 0.25s(an individual) when they are antarafacial.Conclusions(1)The preexcitation syndrome for descending by AP may mask the manifestation of BBB and AVB and simultaneously shorten the prolonged PJ intervals to variable extents.(2)The prolonged PJ intervals in patients with the preexcitation syndrome indicate its combination with AVB or BBB but we can not exclude the possibility of its combination with BBB if the duration of PJ interval is in the normal range.
【Fund】: 辽宁省教育厅基金(编号:20072105)
【CateGory Index】: R541.7
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