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- Mar 29, 2015
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I feel like an idiot for asking this, but I cant seem to find the answer.
I know that sensory block duration is longer than motor block, due to difference in nerve fiber diameters. But why is the RECOVERY of of the motor and sensory block go in opposite fashion? Why I mean by that is the following:
- Sensory block lasts longer for the lower sacral segments (you start getting sensation back from thoracic, then lumbar then sacral segments).
- Motor block recovery starts with the feet (sacral segments), and lasts longer in the hip muscles (lumbar segments).
I thought it was about the lumbar segments having higher concentration of bupivacaine, but then it should be the same for sensory and motor. What am I missing? :/
I know that sensory block duration is longer than motor block, due to difference in nerve fiber diameters. But why is the RECOVERY of of the motor and sensory block go in opposite fashion? Why I mean by that is the following:
- Sensory block lasts longer for the lower sacral segments (you start getting sensation back from thoracic, then lumbar then sacral segments).
- Motor block recovery starts with the feet (sacral segments), and lasts longer in the hip muscles (lumbar segments).
I thought it was about the lumbar segments having higher concentration of bupivacaine, but then it should be the same for sensory and motor. What am I missing? :/
