Korean J Anesthesiol.  2005 Nov;49(5):606-611. 10.4097/kjae.2005.49.5.606.

Extraction of Parameters for the Depth of Anesthesia Using Frequency Analysis Method

Affiliations
  • 1Department of Anesthesia and Pain Medicine, Wallace Memorial Boptist Hospital, Busan, Korea. nonpain@paran.com
  • 2Department of Anesthesia and Pain Medicine, College of Medicine, Pusan National University, Busan, Korea.

Abstract

BACKGROUND: General anesthesia alters autonomic nervous system activity. Evaluation of the autonomic nervous system activity using heart rate variability and so, evaluating the anesthetic depth was tried.
METHODS
In thirty patients undergoing gynecological surgery under general inhalational anesthesia with enflurane, a 10-minute EKG was perioperatively acquired during main incidents. The heart rate variability was analyzed and expressed as 5-minute signals.
RESULTS
In an analysis of the frequency area adopting the heart rate variability, both low and high frequencies represented the effects of the autonomic nervous system, but the low and high frequencies, their ratio and 1/f noise were not valuable in estimating the depth of anesthesia before, during and after the operation. The detrended fluctuation analysis also proved unsuitable for the estimation of the anesthetic depth during an operation.
CONCLUSIONS
The signal using heart rate variability reflects the parameter of the autonomic nervous system during operations.

Keyword

anesthetic depth; frequency analysis; heart rate variability

MeSH Terms

Anesthesia*
Anesthesia, General
Autonomic Nervous System
Electrocardiography
Enflurane
Female
Gynecologic Surgical Procedures
Heart Rate
Humans
Noise
Enflurane
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