title: Autonomic nervous function in Helicobacter pylori-infected patients with atypical chest pain studied by analysis of heart rate variability.
abstract: OBJECTIVE
  Cardiovascular autonomic nervous system (ANS) activity estimated by analysis of heart rate variability (HRV) was compared in Helicobacter pylori-positive and H. pylori-negative male patients suffering from atypical chest pain to verify the hypothesis that autonomic neural system might be the way linking chronic H. pylori infection with gastrointestinal tract disorders.
  
  
  METHODS
  We have analysed data obtained from 101 male patients examined in our clinic due to atypical chest pain, without evidence of serious cardiovascular, respiratory and digestive tract or metabolic diseases. In each patient, besides interview and physical examination, were performed: gastroscopy with mucosa biopsy (for urease test and histology), oesophageal pH-metry and manometry, ultrasound abdomen examination, chest X-ray, exercise test on running track, 24-h ECG Holter monitoring with time-domain and frequency-domain HRV analysis, and echocardiography.
  
  
  RESULTS
  In comparison with H. pylori-negative, in all H. pylori-infected patients (n = 63) a significantly greater low frequency power, an index of sympathetic activity, and higher values of vagal tone parameters [pNN50, percentage of differences between RR intervals that are greater than 50 ms; high-frequency power in HRV analysis (HF)] were observed. The relationship between H. pylori infection and the HF value was confirmed in multi-factorial analysis. The aforementioned ANS activity differences were accompanied by: significantly fewer gastro-oesophageal acid reflux episodes, lower gastric acidity and more effective and complete oesophageal peristalsis in H. pylori-positive patients.
  
  
  CONCLUSIONS
  H. pylori infection may affect ANS activity and via this way also contribute to gastro-oesophageal and cardiovascular pathology.
authors.affiliation: Department of Gastroenterology, Vascular Diseases and Internal Medicine, The Ludwik Rydygier Medical University, Bydgoszcz, Poland. budz@cps.pl
authors.forename: Jacek
authors.initials: J
authors.lastname: Budzyński
authors.forename: Maria
authors.initials: M
authors.lastname: Kłopocka
authors.forename: Robert
authors.initials: R
authors.lastname: Bujak
authors.forename: Maciej
authors.initials: M
authors.lastname: Swiatkowski
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Pulkowski
authors.forename: Władysław
authors.initials: W
authors.lastname: Sinkiewicz
mesh_terms: D000328:Adult; D001341:Autonomic Nervous System / Q000503:physiopathology*; D016022:Case-Control Studies; D002637:Chest Pain / Q000382:microbiology; D015716:Electrocardiography, Ambulatory; D004947:Esophagus / Q000503:physiopathology; D005080:Exercise Test; D005745:Gastric Acidity Determination; D005753:Gastric Mucosa / Q000473:pathology; D006339:Heart Rate / Q000502:physiology*; D016481:Helicobacter Infections / Q000473:pathology / Q000503:physiopathology*; D016480:Helicobacter pylori; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008365:Manometry; D008875:Middle Aged; D016016:Proportional Hazards Models; D012815:Signal Processing, Computer-Assisted