title: The ventricular late potentials in children with vasodepressor response of vasovagal syncope.
abstract: OBJECTIVE
  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 was measured.
  
  
  RESULTS
  HR 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 values 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.
authors.affiliation: Department of Pediatric Cardiovasology, Children's Medical Center, The Second Xiangya Hospital, Central South University; Institute of Pediatrics, Central South University, Changsha, Hunan, 410011, China.
authors.forename: Runmei
authors.initials: R
authors.lastname: Zou
authors.affiliation: Department of Pediatric Cardiovasology, Children's Medical Center, The Second Xiangya Hospital, Central South University; Institute of Pediatrics, Central South University, Changsha, Hunan, 410011, China.
authors.forename: Yunli
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Pediatric Cardiovasology, Children's Medical Center, The Second Xiangya Hospital, Central South University; Institute of Pediatrics, Central South University, Changsha, Hunan, 410011, China.
authors.forename: Lijia
authors.initials: L
authors.lastname: Wu
authors.affiliation: Department of Pediatric Cardiovasology, Children's Medical Center, The Second Xiangya Hospital, Central South University; Institute of Pediatrics, Central South University, Changsha, Hunan, 410011, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Li
authors.affiliation: Department of Pediatric Cardiovasology, Children's Medical Center, The Second Xiangya Hospital, Central South University; Institute of Pediatrics, Central South University, Changsha, Hunan, 410011, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Li
authors.affiliation: Department of Pediatric Cardiovasology, Children's Medical Center, The Second Xiangya Hospital, Central South University; Institute of Pediatrics, Central South University, Changsha, Hunan, 410011, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Lin
authors.affiliation: Department of Pediatric Cardiovasology, Children's Medical Center, The Second Xiangya Hospital, Central South University; Institute of Pediatrics, Central South University, Changsha, Hunan, 410011, China.
authors.forename: Zhenwu
authors.initials: Z
authors.lastname: Xie
authors.affiliation: Department of Pediatric Cardiovasology, Children's Medical Center, The Second Xiangya Hospital, Central South University; Institute of Pediatrics, Central South University, Changsha, Hunan, 410011, China. Electronic address: wangcheng2nd@126.com.
authors.forename: Cheng
authors.initials: C
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D019462:Syncope, Vasovagal / Q000175:diagnosis* / Q000503:physiopathology*; D018667:Tilt-Table Test / Q000379:methods*
keywords: Head-up tilt test; Vasodepressor response; Vasovagal syncope; Ventricular late potentials