Circadian effects on neural blockade of intrathecal hyperbaric bupivacaine.

Korean J Pain

Department of Anesthesiology and Pain Medicine, Wonkwang University School of Medicine, Iksan, Korea.

Published: September 2010

Background: Circadian variations in the absorption, distribution, protein binding, elimination and metabolism of drugs account for many of the administration-time-dependent differences in their pharmacokinetics. The aim of this study is to determine whether the time of intrathecal injection influences spinal anesthesia.

Methods: Ninety patients scheduled for orthopedic surgery were randomly assigned to three groups. Each group received spinal anesthesia with 0.5% bupivacaine 10 mg at different times; group AM (8 am to 12:00), group Noon (12:00 to 4:00 pm) and group PM (4:00 pm to 8:00 pm). Sensory and motor blockade were assessed by pinprick and a four-point modified Bromage scale. Time to first postoperative analgesic requirement and side effects such as hypotension, bradycardia, nausea, and shivering were recorded.

Results: No significant differences were found among the three groups in peak sensory blockade, duration of motor block to Bromage 1 or side effects, but time to first postoperative analgesic requirement (P = 0.008), and recovery time of S1 sensation to pinprick were significantly prolonged in group Noon compared with the other groups (P = 0.03).

Conclusions: The tine of administration of spinal local anesthetics influences the duration of local anesthesia.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2935980PMC
http://dx.doi.org/10.3344/kjp.2010.23.3.186DOI Listing

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