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目的 探讨Q T离散度 (Q Td)及校正Q T离散度 (Q Tcd)对判断小儿扩张型心肌病 (DCM)预后的价值。方法 检测 2 9例DCM患儿 (其中好转者 16例定为Ⅰ组 ,恶化、死亡者 13例定为Ⅱ组 )及 30例同年龄组正常儿童的心电图Q T间期、校正Q T(Q Tc)间期及Q Td、Q Tcd。结果 ①Ⅰ组心功能分级主要为Ⅱ级 ,占 6 3% ,Ⅱ组均为Ⅳ级 ,占 10 0 % ;ST T下移及室性心律失常Ⅰ组分别占 31%、0 ,Ⅱ组分别占 10 0 %、38%。②Ⅰ组、Ⅱ组与对照组Q Td、Q Tcd分别比较均有显著差异 (P <0 0 1) ;Ⅱ组比Ⅰ组Q Td增大 ,但无统计学意义 (P >0 0 5 ) ;Ⅱ组与Ⅰ组Q Tcd比较有显著差异 (P <0 0 5 )。结论 DCM患儿Q Td、Q Tcd增大 ;Q Tcd比Q Td能更准确地反映心肌复极离散程度 ;DCM患儿Q Td、Q Tcd增加显著者可能与其预后不良有关
Objective To investigate the value of Q Td (Q Td) and corrected Q T dispersion (Q T cd) in judging the prognosis of children with dilated cardiomyopathy (DCM). Methods Twenty-nine patients with DCM (QI), QT (QTc) and QT (QTc) were measured in 29 children with DCM (among whom 16 were improved, Group I was deteriorated, and 13 died as Group II) and 30 normal children of the same age group. Interval and Q Td, Q Tcd. Results ① The grade of cardiac function in group Ⅰ was grade Ⅱ, accounting for 63%, grade Ⅱ in group Ⅱ was grade Ⅳ, accounting for 100%; group Ⅰ in ST T down and ventricular arrhythmia respectively accounting for 31%, group 0 and group Ⅱ respectively 10 0%, 38%. ② There were significant differences in Q Td and Q Tcd between Ⅰ group, Ⅱ group and control group (P <0.01). Ⅱ T group was higher than that of Ⅰ group, but there was no statistical significance (P> 0.05). There was a significant difference in Q Tcd between group Ⅱ and group Ⅰ (P <0 05). Conclusions The Q Td and Q Tcd of DCM children are increased. Q Tdc can reflect the degree of myocardial repolarization more accurately than Q Td. The significant increase of Q Td and Q Tcd in DCM children may be related to their poor prognosis