Why it matters
The patient who returns to the PACU, or calls from home, with a headache after a spinal or an epidural is usually right about the diagnosis and occasionally catastrophically wrong. The 2023 multisociety consensus guideline gives the PACU three things it did not have in one place before: a window in which to suspect the diagnosis, a ladder of treatments with their grades, and the red flags that mean the headache is something else uppal-2023. The alternative diagnoses it names, subdural hematoma and cerebral venous sinus thrombosis, are the reason the red flags matter uppal-2023.
The consequence of getting this wrong is a blood patch placed in a patient whose headache was never postural.
Mechanism
A dural puncture leaves a hole through which cerebrospinal fluid leaks faster than it is produced. The fall in intracranial volume lets the brain sag when the patient is upright, stretching pain-sensitive structures, and provokes compensatory venous dilatation. That is why the headache is postural, why it can bring neck stiffness, hearing symptoms, visual disturbance and vertigo, and why sealing the leak with blood relieves it. It is also why a headache that does not change with posture, or that begins after the hole should have sealed, does not fit the mechanism and needs another explanation.
Evidence
The guideline’s diagnostic statement, at moderate certainty, is that post-dural puncture headache should be suspected if headache or neurological symptoms, which may be relieved when lying flat, occur within 5 days of a neuraxial procedure; inpatients who have received a neuraxial procedure should be reviewed and evaluated for symptoms, and outpatients instructed to report them (grade A, high certainty) uppal-2023. The typical accompanying features are neck stiffness, pain in the cervical, thoracic or lumbar spine, subjective hearing symptoms, visual disturbances and vertigo; the older definition the paper quotes is a headache within 5 days of lumbar puncture that remits spontaneously within 2 weeks or after sealing of the leak uppal-2023. Younger adults and female sex are associated with increased risk, at high certainty uppal-2023.
Conservative management: routine bed rest is not supported and may be used only as a temporizing measure (C, low); hydration should be maintained orally, intravenously only if oral intake cannot be maintained (C, low); abdominal binders and aromatherapy are not supported (D, low); regular multimodal analgesia including acetaminophen and NSAIDs is recommended for all unless contraindicated (B, low); short-term opioids may be used if multimodal analgesia is ineffective (C, low) and long-term opioids are not recommended (D, moderate); caffeine may be offered in the first 24 h, maximum 900 mg per day, 200 to 300 mg if breastfeeding (B, low); and hydrocortisone, theophylline, triptans, ACTH, neostigmine or atropine, piritramide, methergine and gabapentin are not supported (I, low) uppal-2023.
Procedures: sphenopalatine ganglion block is not supported (I, low); greater occipital nerve block may be offered after spinal anesthesia with a needle of 22 G or finer, though the headache may recur (C, moderate); epidural saline is temporary only; fibrin glue is reserved for refractory cases or when autologous blood is contraindicated (I, low) uppal-2023.
Epidural blood patch: recent series report complete remission in 33% to 91% (low); the most recommended volume is 15 to 20 mL (low) and more than 30 mL does not increase success (moderate); the patch should be considered when the headache is refractory to conservative therapy and impairs activities of daily living (B, moderate), and for severe neurological symptoms such as hearing loss and cranial neuropathies (C, moderate); if performed within 48 h of the puncture the patient should be counseled about a more likely need for a repeat (B, moderate); it is performed at or one space below the known puncture level (B, moderate); consent must include repeat dural puncture, backache and neurological complications (A, high); injection is slow and incremental and stops for substantial backache or headache (B, moderate); and epidural analgesia should not be withheld after a prior patch (C, low) uppal-2023.
Imaging: brain imaging may be considered when a non-orthostatic headache is present or develops after an initial orthostatic one, or when onset is more than 5 days after the suspected puncture (C, low); focal neurological deficits, visual changes, alterations in consciousness or seizures, especially postpartum, should prompt neuroimaging to evaluate alternative diagnoses, named as subdural hematoma and cerebral venous sinus thrombosis (B, moderate) uppal-2023. Follow-up continues until the headache resolves (B, moderate), with urgent imaging and referral for worsening symptoms despite a patch, new focal signs, or a change in the nature of the headache (B, moderate); inadvertent dural puncture and post-dural puncture headache are associated with chronic headache, backache, neck pain, depression, cranial nerve palsy, subdural hematoma and venous sinus thrombosis (moderate) uppal-2023.
The full-length guideline with 50 recommendations is the companion to the summary quoted here; it has not been read, and the day cites the summary uppal-2024-rapm.
What this does not show
The guideline is consensus with graded evidence, and most of the conservative-treatment grades are low certainty uppal-2023. What it establishes firmly is the shape: suspect within a window, treat conservatively, patch when refractory and disabling, image on red flags. What it does not establish is that any single conservative measure changes the course, and it says so with the grades.
Nothing here is specific to the PACU. The guideline is about the patient after any neuraxial procedure, and the PACU’s role is the first review and the first instruction to report symptoms uppal-2023.
Incidence by needle type and size, and the effect of needle choice on prevention, are in the full guideline and not in the summary quoted here: [NUMBER NEEDED: incidence of post-dural puncture headache by needle gauge and tip design].
At the bedside
Before a patient who has had a spinal or an epidural leaves the PACU, review them for headache and neurological symptoms, and if they are going home, tell them what to report and for how long: five days uppal-2023.
When the headache comes, ask whether it changes with posture and when it started. A headache that is not postural, that begins late, or that arrives with a focal sign, a visual change, altered consciousness or a seizure is imaged, not patched uppal-2023.
Start with analgesia and caffeine, not bed rest and a binder, and move to a blood patch when the headache is refractory and stops the patient living normally, counseling about a repeat if it is done within 48 h uppal-2023. [PRACTICE VARIES: who performs the blood patch, where, and after how long a trial of conservative treatment differ between institutions.]