Cheng Wang
Central South University, China
Title: The ventricular late potentials in children with vasodepressor response of vasovagal syncope
Biography
Biography: Cheng Wang
Abstract
Objectives: The objective is to discuss ventricular late potentials (VLPs) in children with vasodepressor response of vasovagal syncope (VVS-V).
Methods: 184 children diagnosed as VVS-V by head-up tilt test (HUTT) were enrolled as VVS-V group, 105 age and gender matched healthy individuals without syncope were used as control group, then signal-averaged electrocardiogram were measured.
Results: Heart rate was decreased [(83.98±12.27) vs. (87.28±13.75) bpm, P<0.05] in VVS-V group compared with control group. The prevalence of positive VLPs was not significantly different between the two groups. However, the absolute value of TQRS [(84.89±12.05) vs. (81.21±8.23) ms, P<0.01], RMS40 [(28.73±7.23) vs. (26.89±7.36) μV, P<0.05] and LAS40 [(62.43±19.17) vs. (56.79±1.83) ms, P<0.05] were significantly prolonged in VVS-V group compared with control group, and more patients in VVS-V group had abnormal prolonged LAS40 (94.57% vs. 83.80%, P<0.01).
Conclusions: The prevalence of positive VLPs was not significantly different, TQRS, RMS40, LAS40 were longer in children with VVS-V in comparison with healthy individuals, and the abnormal LAS40 occurred in a higher proportion of VVS-V group.