体外循环先天性心脏病纠治术对QT离散度的影响及意义

目的 研究体外循环心脏不停姚心内直视术纠治先天性心脏病对ＱＴ离散度（ＱＴｄ）的影响及其意义。方法 记录２０例先天性心脏病纠治术患者术前、术终和术后７天内同步１２导联心电图，测定各时间点ＱＴｄ值和ＱＴ离散校正值（ＱＴｃｄ）。结果 术终及术后ＱＴｄ、ＱＴｃｄ明显升高（Ｐ〈０．０５）。术后第２天达最高值，虽然术后第７天仍未能恢复至术前水平，但总体表现为一个缓慢回落的趋势。１例术后频发室性早搏患者及１例术

The Effects of Surgical Correction on QT Dispersion in Patients with Congenital Heart Diseases Undergoing Extracorporeal Circulation

Objective The effects of surgical correction on QT dispersion(QTd) were studied in patients with congenital heart disease undergoing cardiac surgery on beating heart during extracorporeal circulation. Methods Electrocardiograms were recorded before, during and 7 days after operation. QTd and corrected value of QT dispersion(QTcd) were measured at each points. Results The value of QTd and QTcd were obviously rising and came to the peak 2nd day after operation. Although there was a descendant of tendency, the value were still higher than that of the preoperative period( P<0.05) . In one patient who died of arrhythmia and one who suffered from frequent ventricular premature beats, QTd and QTcd were higher than those who recovered smoothly. Conclusion (1)QTd in patients with congenital heart disease undergoing cardiac surgery on beating heart rises obviously and perhaps relates to anesthesia and operative damage. (2) QTd may be an useful and valuable indicator in evaluating postoperative arrhythmia and the course of recovery.