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Hyperbaric bupivacaine affects the doses of midazolam required for sedation after spinal anaesthesia

Published online by Cambridge University Press:  25 November 2005

H. İ. Toprak ,
Z. Ozpolat ,
E. Ozturk ,
M. H. Ulger ,
O. Sagir  and
M. O. Ersoy
H. İ. Toprak
Affiliation:
Medical School of Inonu University, Department of Anaesthesiology, Malatya, Turkey
Z. Ozpolat
Affiliation:
Medical School of Inonu University, Department of Anaesthesiology, Malatya, Turkey
E. Ozturk
Affiliation:
Medical School of Inonu University, Department of Anaesthesiology, Malatya, Turkey
M. H. Ulger
Affiliation:
Medical School of Inonu University, Department of Anaesthesiology, Malatya, Turkey
O. Sagir
Affiliation:
Medical School of Inonu University, Department of Anaesthesiology, Malatya, Turkey
M. O. Ersoy
Affiliation:
Medical School of Inonu University, Department of Anaesthesiology, Malatya, Turkey
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Summary

Background and objective: Patients having spinal anaesthesia with hyperbaric bupivacaine may become sensitive to sedative drugs but no data exists about any dose-related effect of the local anaesthetic on the sedative requirement. We aimed to investigate whether hyperbaric bupivacaine dose in spinal anaesthesia has any effect on midazolam requirements. Methods: Sixty unpremedicated patients were allocated to three equal groups. Patients in Groups I and II received hyperbaric bupivacaine 0.5% 10 and 17.5 mg respectively for spinal anaesthesia and Group III was a control group without spinal anaesthesia. In Groups I and II, after the evaluation of sensory block, patients received intravenous midazolam 1 mg per 30 s until the Ramsay sedation score reached 3 (drowsy but responsive to command). In Group III, general anaesthesia was induced after sedation score had reached 3 using midazolam. The total dose of midazolam (mg kg−1) given to each patient, the level of sensory block and complications were recorded. Results: The level of sensory block was higher in Group II (T7) than Group I (T9) (P < 0.01). The doses of midazolam were 0.063 mg kg−1 in Group I, 0.065 mg kg−1 in Group II and 0.101 mg kg−1 in Group III (P < 0.001). There was no correlation between level of sensory block and dose of midazolam in Group I (r = −0.293, P = 0.21) and Group II (r = 0.204, P = 0.39). Conclusions: Different doses of hyperbaric bupivacaine for spinal anaesthesia do not affect the midazolam requirements for sedation. However, spinal anaesthesia with hyperbaric bupivacaine with a maximum spread in the middle thoracic dermatomes may be associated with sedative effects and thus a reduced need for further sedation with midazolam.

Keywords

ANAESTHETIC TECHNIQUES, spinalANAESTHETIC LOCAL, bupivacaineSEDATIVE AGENTS, midazolamSEDATION
Type
Original Article
Information
European Journal of Anaesthesiology , Volume 22 , Issue 12 , December 2005 , pp. 904 - 906
Copyright
© 2005 European Society of Anaesthesiology

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