Power spectral heart rate analysis demonstrates decreased activity of the sympathetic nervous system during low bupivacaine spinal anesthesia

Journal of Clinical Anesthesia
J E TetzlaffA Schubert

Abstract

To evaluate the onset of spinal anesthesia with power spectral heart rate analysis to determine the influence of the block on the autonomic nervous system. Prospective, clinical evaluation. Tertiary-care teaching hospital. 27 ASA physical status I and II patients scheduled for lower extremity orthopedic surgery and free of major cardiac disease or cardiac drugs with direct influence of heart rate (HR) or blood pressure (BP). Prior to anesthesia, a baseline power spectral heart rate reading was taken in the supine position. Spinal anesthesia was established in the sitting position with 15 mg of bupivacaine and 0.2 mg epinephrine introduced at the L3-L4 interspace with a 22-gauge Quincke needle. The patient was returned supine, and power spectral heart rate data were again collected at 5-minute intervals throughout the procedure. Level of the spinal block was checked at 5-minute intervals until 30 minutes and considered complete when two consecutive readings were unchanged. Heart rate and BP were recorded at baseline and at five-minute intervals after injection. Power spectral heart rate data included low-frequency activity (LFa), high-frequency activity (HFa), and the ratio (LFa/HFa). Spinal level achieved was recorded by thorac...Continue Reading

References

Dec 1, 1992·Journal of Cardiothoracic and Vascular Anesthesia·F G EstafanousC Ferrario
Jun 1, 1986·Anesthesia and Analgesia·J F ButterworthL H Cohn
Oct 1, 1995·Anesthesiology·R P IntronaR S Crumrine
Aug 1, 1994·Canadian Journal of Anaesthesia = Journal Canadien D'anesthésie·M Arakawa, F Goto

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