title: Heart rate variability during chemical thoracic sympathectomy.
abstract: BACKGROUND
  Chemical thoracic sympathectomy (CTS) resulted in profound bradycardia in a patient with severe post-therapeutic neuralgia. To clarify the cause of this bradycardia, the authors evaluated heart rate variability using a Poincaré plot, which is a scatter diagram of the current R-R interval plotted against the R-R interval immediately preceding it, in this patient and in others scheduled for CTS or mandibular block (MB).
  
  
  METHODS
  Twenty-three patients were scheduled for CTS (n = 13, CTS group) and for MB (n = 10, MB group). Heart rate and the SD of the R-R interval variabilities spreading along the x axis (SDRR) and perpendicularly along the diagonal line of the Poincaré plot (SDdeltaRR) were evaluated before, just after, and 1 h after the block.
  
  
  RESULTS
  Neither group had significant changes in heart rate. The MB group showed no significant change in the SD(RR):SDdeltaRR ratio. In the CTS group, however, the SD(RR):SDdeltaRR ratio decreased significantly from 1.72+/-0.20 to 1.23+/-0.11 just after CTS. The previous patient, who had a high SD(RR):SDdeltaRR ratio of 3.45 before CTS, exhibited severe bradycardia (22 beats/min).
  
  
  CONCLUSIONS
  The SD(RR):SDdeltaRR ratio decreased after CTS without any significant concomitant change in heart rate. The decrease in the SD(RR):SDdeltaRR. ratio indicates a reduction of cardiac sympathetic activity. However, CTS in patients having high SD(RR):SDdeltaRR ratios can result in profound bradycardia.
authors.affiliation: Department of Anesthesiology, Kyoto Prefectural University of Medicine, Japan. hirose@koto.kpu-m.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Hirose
authors.forename: H
authors.initials: H
authors.lastname: Imai
authors.forename: M
authors.initials: M
authors.lastname: Ohmori
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: F
authors.initials: F
authors.lastname: Amaya
authors.forename: T
authors.initials: T
authors.lastname: Hosokawa
authors.forename: Y
authors.initials: Y
authors.lastname: Tanaka
mesh_terms: D000328:Adult; D000368:Aged; D001794:Blood Pressure; D001919:Bradycardia / Q000209:etiology; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D013563:Sympathectomy, Chemical