The study of the changes of QT dispersion and heart rate variability in children with ventricular contraction
10.3969/j.issn.1006-5725.2014.20.016
- VernacularTitle:儿童室性期前收缩QT间期离散度和心率变异性的研究
- Author:
Kun SHI
;
Tingting CHEN
;
Wenqi NIU
;
Yu FANG
;
Yilin LIU
;
Yan LI
;
Yonghong GUO
;
Xianmin WANG
- Publication Type:Journal Article
- Keywords:
Ventricular contraction;
QT dispersion;
Heart rate variability
- From:
The Journal of Practical Medicine
2014;(20):3252-3255
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the changes of QT dispersion and heart rate variability in children with ventricular contraction. Methods 50 healthy children who came for medical examinations at Chengdu Women′s and Children′s Central Hospital from January 2012 to January 2014 were selected as control group. 147 children with ventricular contraction admitted in Pediatric Intracardiac Department of Chengdu Women′s and Children′s Central Hospital from January 2012 to January 2014 were divided them into Benign Group (LownⅠ&LownⅡ) and Malignant Group(LownⅢ, LownⅣA, LownⅣB&LownⅤ) according to the results of Lown classification. Benign Group contained 90 cases while Malignant Group contained 57 cases. Difference in QT dispersion and indices of heart rate variability of the three groups were compared. Results There were no statistically differences between control group and benign group in QT dispersion (P > 0.05). QT dispersion of malignant group was much longer than that of control group and the differences had statistically meaning(P<0.001). SDNN(standard deviation of NN intervals) , SDANN (standard deviation of the averages of RR intervals ), SDNN index (index of standard deviation of the averages of NN intervals), rMSSD(root mean square of successive differences) and PNN50(percentage of successive normal sinus RR intervals>50 ms) of malignant group was much shorter than that of control group and benign group and the differences had statistically meaning (P< 0.01). SDNN, SDANN and SDNN index of benign group was shorter than that of control group and the differences had statistically meaning (P<0.05). Conclusions Heart rate variability of children with malignant ventricular contraction becomes significantly shorter and QT dispersion becomes significantly longer. Detection of QT dispersion and heart rate variability can effectively predict the risky degree of ventricular contraction in children.
