title: R-wave peak time at lead II in Chinese healthy adults.
abstract: BACKGROUND
  Wide QRS complex tachycardia (WCT) is a common arrhythmia. How to differentiate between WCTs is a challenge in clinical practice. Recently R-wave peak time (RWPT) at lead II was reported to be a helpful and simple tool for differentiating WCTs. However, it has remained unknown about the reference range of RWPT at lead II. In present study, we aimed to investigate the reference range of RWPT at lead II in Chinese healthy adults.
  
  
  METHODS
  A retrospective study was conducted in the First Affiliated Hospital of Shantou University Medical College in Southern China. Two thousand four hundred healthy adults aged 21-80 years with no history of structural heart diseases were included. RWPT at lead II was determined.
  
  
  RESULTS
  Of 2400 healthy adults, 1200 men and 1200 women were included. The differences of age, mean heart rate and mean QRS duration at lead II between male and female were not significant. RWPT ranged from 16 to 42 ms in male while from 16 to 44 ms in female. The 95 % reference range of RWPT in normal male and female are 19.91 ~ 39.55 ms and 21.75 ~ 37.67 ms, respectively. Compared with the female, the male had a significantly longer RWPT at lead II (29.73 ± 5.01 ms vs 29.71 ± 4.06 ms in female, P = 0.000).
  
  
  CONCLUSIONS
  Our study showed that RWPT at lead II is different between male and female. The male had a significantly longer RWPT at lead II than the female.
authors.affiliation: Mianyang Central Hospital, Mianyang, Sichuan, 621000, China.
authors.forename: Jinhua
authors.initials: J
authors.lastname: Deng
authors.affiliation: Department of Cardiology, the First Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Chen
authors.affiliation: Department of Cardiology, the First Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Chujuan
authors.initials: C
authors.lastname: Zeng
authors.affiliation: Department of Cardiology, the First Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Lu
authors.affiliation: Department of Cardiology, the First Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Zhou
authors.affiliation: Department of Cardiology, the First Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Xuerui
authors.initials: X
authors.lastname: Tan
authors.affiliation: Department of Cardiology, the First Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong, 515041, China. 717146@sina.com.
authors.forename: Min
authors.initials: M
authors.lastname: Yu
mesh_terms: D000200:Action Potentials; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D002681:China; D004562:Electrocardiography / Q000592:standards; D005260:Female; D054624:Health Status Disparities; D064368:Healthy Volunteers; D006329:Heart Conduction System / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012016:Reference Values; D012189:Retrospective Studies; D012737:Sex Factors; D013617:Tachycardia, Supraventricular / Q000175:diagnosis / Q000208:ethnology / Q000503:physiopathology; D017180:Tachycardia, Ventricular / Q000175:diagnosis / Q000208:ethnology / Q000503:physiopathology; D013997:Time Factors; D055815:Young Adult
keywords: Electrocardiography; Supraventricular tachycardia; Ventricular tachycardia; Wide QRS complex tachycardia