Why should a spinal anesthesia patient remain flat post-op?

• A. To prevent infection
• B. Prevention of headache
• C. To avoid dehydration
• D. To improve breathing

Answer: (B)

After spinal anesthesia, the needle creates a small hole in the dura, allowing cerebrospinal fluid to leak. This can lower CSF pressure and cause a post-dural puncture headache, which is often made worse when you sit up or stand and relieved when you lie flat. Keeping the patient flat in the early postoperative period helps maintain CSF pressure and reduces the traction on pain-sensitive meninges, lowering both the risk and severity of this headache. This is especially pertinent in the first day when PDPH commonly occurs. The other reasons—preventing infection, avoiding dehydration, or improving breathing—don’t address the CSF leak mechanism that leads to PDPH. If headache develops despite staying flat, other treatments may be needed, but the flat position mainly targets preventing PDPH.