Characteristics of electrocardiographic parameters of the right heart in 75 cases of early newborns with varying gestational age / 中华实用儿科临床杂志

ABSTRACT

Objective To observe the characteristics of electrocardiographic parameters of the right heart in the early newborns with different gestational age.Methods Seventy-five cases of early newborns from January 2014 to January 2015 were selected.They were divided into 4 groups according to gestational age,15 cases in group A (28-30 weeks),18 cases in group B (＞30-33 weeks),17 cases in group C (＞33-37 weeks) and 25 cases in group D (＞ 37-40 weeks).All newborns were examined by the synchronous 12-lead ECG machine,and the changes in ECG time limit detection results,QRS amplitude and RV1 amplitude were compared among groups.Results (1) There was a significant difference in P-R intervals among group A [(0.090 ± 0.011) s],group B [(0.095 ± 0.012) s],group C [(0.098 ± 0.013) s] and group D [(0.105 ± 0.014) s] (F =7.458,P ＜ 0.05).The P-R intervals of group A,group B and group C were much shorter than those of group D (P ＜ 0.05);the comparison of QRS duration and QTc among groups had no statistical significance (F =1.626,1.569,all P ＞ 0.05).(2) In group A:QRS amplitude was:(4.430 ± 1.380) mV,RV1 amplitude:(0.850 ± 0.420) mV;in group B:QRS amplitude was:(4.800 ± 1.350) mV,RV1 amplitude:(1.012 ± 0.425) mV;in group C:QRS amplitude was:(5.200 ± 1.600) mV,RV1 amplitude:(1.210 ± 0.520) mV;in group D:QRS amplitude was:(5.800 ± 1.800) mV,RV1 amplitude:(1.509 ± 0.525) mV.There were significant differences in QRS and RV1 amplitude among 4 groups (F =7.002,16.870,all P ＜ 0.05).The QRS amplitude changes in group A and group C were far less than those in group D (P ＜ 0.05),the RV1 amplitude changes in group A,group B,and group C were far less than those in group D (P ＜ 0.05),and there was no difference between among other groups (all P ＞ 0.05).Conclusions There are correlations between the electrocardiographic parameters of right heart and the gestational age of newborn infants.These parameters,including the P-R intervals,the amplitude of QRS and RV1,increase with the gestational age.