title: [Predicative significance of HRV and HRT to premature beat on patients with coal worker's pneumoconiosis].
abstract: OBJECTIVE
  To determine the predicative significance of HRV and HRT to premature beat on patients with coal-worker's pneumoconiosis.
  
  
  METHODS
  100 coal-worker's pneumoconiosis patients with premature beat (including 44 cases of occasional ventricular premature contraction and 56 cases of frequent ventricular premature contraction) were chosen as CWP group, and 50 healthy coal workers were chosen as control group. 24 h DCG was used to monitor and analyze the change of premature beat and to calculate HRV. Index: SDNN, SDANN, HFLF, HRT: TO, TS, compare HRV of CWP group and control group and the changes of HRT of both occasional and frequent ventricular premature contraction.
  
  
  RESULTS
  The incidence of CWP at night (66.1%, 37 cases) is higher than that during daytime (33.9%, 19 cases), and the difference is statistically significant with P < 0.05. HRV (SDNN SDANN HF HL) indexes of CWP group are lower than control group, and the difference is statistically significant with P < 0.05. HRV indexes of control group at night are higher than that during daytime, and the difference is statistically significant with P < 0.05. Comparison of CWP group HRV indexes between day and night is statistically insignificant with P > 0.05. Compared with control group, TO of CWP group is higher while TS is lower, and the difference is statistically significant with P < 0.05. Compared with occasional ventricular premature contraction patients in CWP group, TO of frequent ventricular premature contraction patients is higher while TS is lower, and the difference is statistically significant with P < 0.05.
  
  
  CONCLUSIONS
  Frequent ventricular premature contraction group in CWP group suffer from severe impaired autonomic nervous function injury, and abnormal HRV and HRT can be prognostic indicator of frequent ventricular premature contraction among coal-worker's pneumoconiosis patients.
authors.affiliation: Cardiovascular Function Department of TaiAn Central Hospital.
authors.forename: Ying
authors.initials: Y
authors.lastname: Bao
authors.forename: Dejun
authors.initials: D
authors.lastname: Wang
authors.forename: Zhenlan
authors.initials: Z
authors.lastname: Du
authors.forename: Shuhen
authors.initials: S
authors.lastname: Liu
mesh_terms: D000368:Aged; D055008:Anthracosis / Q000150:complications*; D016022:Case-Control Studies; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D018879:Ventricular Premature Complexes / Q000175:diagnosis* / Q000209:etiology