title: Orthostatic heart rate variability analysis in idiopathic Parkinson's disease.
abstract: OBJECTIVE
  We evaluated time and spectral analyses of 24-h heart rate variability (HRV) and the heart rate responses to passive tilt in patients with idiopathic Parkinson's disease (IPD) in order to investigate cardiovascular autonomic functions.
  
  
  METHODS
  Twenty-three subjects with IPD without autonomic symptoms and 15 age-matched healthy controls were enrolled. Frequency- and time-domain HRV parameters were studied during resting and passive head-up tilt (HUT) test.
  
  
  RESULTS
  All time-domain parameters were found to be low in patients with IPD. In patients with IPD, both low frequency (LF) and high frequency (HF) decreased during HUT period and no significant change in LF to HF ratio was noted. Both time- and frequency-domain HRV indices showed no correlation with age, disease severity and duration, and with l-dopa medication.
  
  
  CONCLUSIONS
  The results indicate that impairment of autonomic nervous system function in IPD without autonomic symptoms is frequent, and does not show clear association with clinical stage and the age of the patients.
authors.affiliation: Department of Neurology, Akdeniz University School of Medicine, Antalya, Turkey. ebrumihci@akdeniz.edu.tr
authors.forename: E
authors.initials: E
authors.lastname: Mihci
authors.forename: F
authors.initials: F
authors.lastname: Kardelen
authors.forename: B
authors.initials: B
authors.lastname: Dora
authors.forename: S
authors.initials: S
authors.lastname: Balkan
mesh_terms: D000367:Age Factors; D000978:Antiparkinson Agents / Q000008:administration & dosage; D001341:Autonomic Nervous System / Q000503:physiopathology; D016022:Case-Control Studies; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D007980:Levodopa / Q000008:administration & dosage; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000188:drug therapy / Q000503:physiopathology*; D012720:Severity of Illness Index; D018667:Tilt-Table Test; D013997:Time Factors
chemical_list: D000978:Antiparkinson Agents; D007980:Levodopa