What is the difference between subarachnoid anesthesia and epidural anesthesia?

Subarachnoid anesthesia is the injection of anesthetic drugs into the subarachnoid space, while epidural anesthesia is the injection of drugs into the epidural space. The epidural is the outside of the dura mater, through the dura mater to the subdural, and then to the arachnoid, through the arachnoid to the subarachnoid space.

Epidural anesthesia mainly blocks the spinal nerve roots, while subarachnoid anesthesia directly blocks the spinal cord below the plane.

Epidurals are segmental, which means that you have a section of body sensation that is absent, while subarachnoid anesthesia is truncated, which means that there is no sensation below the level of the block.

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