Korean J Anesthesiol Search

CLOSE


Korean J Anesthesiol > Volume 34(6); 1998 > Article
Korean Journal of Anesthesiology 1998;34(6):1186-1192.
DOI: https://doi.org/10.4097/kjae.1998.34.6.1186   
Changes of Heart Rate Variability during Anesthesia in Hypertensive Patients by Nonlinear Dynamics.
Young Jin Lim, Hee Soo Kim, Jong Hoon Yeom, Woo Jong Shin, Yong Chul Kim, Dong Ho Lee, Myoung Gul Yum
1Department of Anesthesiology, Seoul City Boramae Hospital, Seoul, Korea.
2Department of Anesthesiology, College of Medicine, Hanyang University, Kuri, Korea.
3Department of Pediatrics, College of Medicine, Hanyang University, Kuri, Korea.
Abstract
BACKGROUND
Heart rate variability (HRV) is characterized by a variety of linear, non-linear, periodic and non-periodic oscillations. The aim of the present study was mainly to investigate the characteristics of nonlinear dynamics of HRV of the hypertensive patients by anesthesia comparing with the normotensive patients.
METHODS
With informed consent, unpremedicated normotensive (n=20) and the hypertensive patients (n=22) were included in this study. ECG data were collected from 10 minutes before induction to 15 minutes after induction. Collected ECG data were stored into computer binary files. We calculated correlation dimensions (CD, degree of freedom of system), 1/f noise (beta, nonlinearity) and Hurst exponents (HE, roughness of signals) from the collected ECG data.
RESULTS
During resting state, CD of the hypertensive patients was significantly lower than that of the normotensive patients (P<0.05). During maintenance of anesthesia, there was no difference of CD between the two groups. CD of two groups were decreased significantly after anesthesia (P<0.001). The values of and HE of two groups were not different during resting state and maintenance of anesthesia. But the values of and HE of two groups were increased significantly after anesthesia (P<0.001).
CONCLUSION
As the CD of the hypertensive patients is lower than of the normotensive patients during resting state, the degree of freedom of heart rate control system of the hypertensive patients is more smaller than that of the normotensive patients. Decreasing of CD after anesthesia in two groups means that degree of freedom of heart rate control system is decreased by anesthesia. Increasing of 1/f noise after anesthesia in two groups means that nonlinearity of heart rate variability is decreased by anesthesia. Increasing of HE after anesthesia in two groups means that roughness of heart rate variability is decreased by anesthesia.
Key Words: Anesthesia: hypertension; Heart: heart rate variability; correlation dimension
TOOLS
Share :
Facebook Twitter Linked In Line it
METRICS Graph View
  • 0 Crossref
  •    
  • 997 View
  • 4 Download


ABOUT
ARTICLE CATEGORY

Browse all articles >

BROWSE ARTICLES
AUTHOR INFORMATION
Editorial Office
101-3503, Lotte Castle President, 109 Mapo-daero, Mapo-gu, Seoul 04146, Korea
Tel: +82-2-792-5128    Fax: +82-2-792-4089    E-mail: journal@anesthesia.or.kr                

Copyright © 2023 by Korean Society of Anesthesiologists.

Developed in M2PI

Close layer
prev next