Obstetric patients were studied after the onset of epidural analgesia using bupivacaine. Sympathetic blockade was assessed using liquid crystal contact thermography. Cold sensory blockade was assessed using ethyl chloride spray. A differential zone of blockade was observed with cold sensory block three to four segments cephalad to the corresponding sympathetic level at 30 and 45 minutes post-block.
- Anesthetic technique
- sympathetic blockade
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