Spinal anesthesia (SA) is commonly used in surgery, but serious complications such as intracranial subdural hemorrhage (ICSH) are uncommon. A subdural hematoma (SDH) is a collection of blood below the dura's inner layer but outside of the brain and arachnoid membrane. Spinal anesthesia is a type of regional neuraxial anesthesia involving the injection of a local anesthetic or opioid into the subarachnoid area, typically through a fine needle, typically 9 cm in length. If necessary track with capnography.
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