Related Experiment Videos
Intravenous clonidine prolongs bupivacaine spinal anesthesia
1Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, Korea. dream@anesthesia.or.kr
Acta Anaesthesiologica Scandinavica
|August 9, 2003
Summary
Intravenous clonidine administered after spinal anesthesia significantly prolongs its duration. This method offers an extended anesthetic effect for approximately one hour without adverse cardiovascular effects.
Area of Science:
- Anesthesiology
- Pharmacology
Background:
- Oral clonidine is known to prolong spinal anesthesia.
- The effect of intravenous clonidine on spinal anesthesia duration is less understood.
Purpose of the Study:
- To investigate the potential of intravenous clonidine to prolong spinal anesthesia when administered after the block.
- To evaluate the impact of timing of intravenous clonidine administration on spinal anesthesia duration.
Main Methods:
- A double-blind, placebo-controlled, prospective study was conducted.
- Patients received hyperbaric bupivacaine spinal anesthesia and were randomized into three groups: immediate intravenous clonidine, delayed intravenous clonidine, or placebo.
- Sensory and motor block durations were assessed.
Main Results:
- Both immediate and delayed intravenous clonidine groups showed significantly prolonged sensory block duration compared to placebo.
- The immediate clonidine group also demonstrated a significantly longer motor block duration.
- No significant differences in heart rate or mean blood pressure were observed among groups.
Conclusions:
- Intravenous clonidine administered within one hour after spinal block effectively prolongs bupivacaine spinal anesthesia.
- The anesthetic prolongation achieved is approximately one hour.
- This intervention appears safe, with no observed adverse cardiovascular effects.