Duration of spinal with dexmed
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dexmedetomidine AND spinal anesthesia
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intrathecal dexmedetomidine spinal anesthesia duration systematic review
With intrathecal dexmedetomidine added to bupivacaine spinal anesthesia, the block is usually prolonged:
- Sensory block: about 2 to 2.5 hours longer on average
- Motor block: about 1.5 to 2 hours longer
- Postoperative analgesia: commonly prolonged by 3 to 5 hours, depending on the local anesthetic, dose, and surgery.
For example, 5 micrograms intrathecal dexmedetomidine with bupivacaine increased sensory-block duration by about 134 minutes versus bupivacaine alone in a meta-analysis (review result).
The exact duration cannot be predicted from dexmedetomidine alone. It depends especially on bupivacaine dose/baricity, intrathecal dexmedetomidine dose, patient factors, and surgical context. Intrathecal dexmedetomidine use is generally off-label, and bradycardia/hypotension should be anticipated.
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