Skip to main content

Intravenous clonidine prolongs bupivacaine spinal anesthesia

Buy Article:

$43.00 plus tax (Refund Policy)


Prolongation of spinal anesthesia by oral clonidine premedication has been known. We hypothesized that intravenous clonidine administered after the spinal block may prolong spinal anesthesia. Methods: 

To assess the prolongation of spinal anesthesia by intravenous clonidine, we designed a double-blind, placebo-controlled, prospective study. Patients scheduled for orthopedic surgery received 12 mg of 0.5% hyperbaric bupivacaine and were randomly divided into three groups (n = 26 in each group). In the clonidine 10-min group, 3 µg kg−1 of clonidine was administered for 10 min immediately after the spinal block. In the clonidine 60-min group, 3 µg kg−1 of clonidine was administered for 10 min, 50 min after the spinal block. The control group received normal saline. Sensory block was evaluated by pinprick and the duration was defined as the time for sensory block to regress to L1 dermatome. Duration of motor block was defined as the time required for the patient to flex his or her knee. Results: 

The duration of sensory block was longer in both the clonidine 10-min and clonidine 60-min groups compared with the control group (196 ± 42 min, 179 ± 41 min vs. 125 ± 25 min, P < 0.05). The duration of motor block was longer in the clonidine 10-min group than in the control group (153 ± 26 min vs. 131 ± 29 min, P < 0.05). The lowest heart rate and mean blood pressure were not different among groups. Conclusions: 

Intravenous clonidine administration within 1 h after the spinal block prolonged bupivacaine spinal anesthesia for approximately 1 h without adverse effects.
No References
No Citations
No Supplementary Data
No Data/Media
No Metrics

Keywords: Anesthesia; bupivacaine; clonidine; spinal

Document Type: Research Article

Affiliations: Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, Korea

Publication date: 2003-09-01

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more