Post Lumbar Puncture Headaches

31 Mar
March 31, 2014

HeadacheLumbar puncture is a procedure that is commonly performed in the emergency department (ED) for both diagnostic and therapeutic reasons. Post lumbar puncture (LP) headache is one of the most common complications from LPs (6 – 36% incidence) and is essentially a clinical diagnosis based on a history of a dural puncture and the postural nature of the headache with associated symptoms.  Additionally, post LP headaches that are left untreated can cause impaired ability to perform activities of daily living and there are case reports of subdural hematoma, herniation, and death. In terms of the prevention and treatment of post-LP headaches, both are equally important in management. Following, is a discussion of which techniques and preventative measures are evidence based and which are not.

What is the pathophysiology behind post lumbar puncture headaches? (17099089)

There are two mechanisms which we believe are the cause of post LP headaches:

  1. Lumbar PunctureLPs are a traumatic procedure, in which a needle is inserted through the dura to access the dural space. After the needle is withdrawn from the dural space, there can be a persistent “hole” in the dura. If this “hole” is large enough, CSF fluid can leak out and cause a drop in CSF pressure. It is believed that this drop in pressure decreases the fluid supporting the brain causing traction on the brain which cause the resultant headache.
  2. It is also theorized that a drop in CSF volume will cause a direct activation of adenosine receptors. This activation leads to cerebral vasculature vasodilatation which can cause “cerebral stretching” and result in headaches.

What is the evidence for prevention of post LP headaches?

Needle Size: Size of the dural puncture site is directly proportional to the likelihood of headache development. Incidence of headache: (17099089)

  • Size Matters16 – 19G Needle ≈ 70%
  • 20 – 22G Needle ≈ 40%
  • 24 – 27G Needle ≈ 12%

Needle size must however be large enough to withdraw fluid safely, efficiently, and measure accurate opening pressures.  Spinal needles < 22G may give false opening pressure readings and take as long as 6 minutes to withdraw 2mL of CSF, therefore the smallest recommended size needle for diagnostic and therapeutic LPs is 22G (8710120)

Direction of Needle Bevel: Dural fibers run in a top to bottom longitudinal direction, therefore, a needle bevel passing parallel to these fibers will just push them apart rather than lacerate them right? (2316881):

  • Spinal Needle Bevel1021 lumbar punctures done
  • Perpendicular direction = 10.2% incidence of post LP headache
  • Parallel direction = 5.5% incidence of post LP headache
  • Conclusion: Parallel direction of needle bevel does decrease incidence of post LP headache

Stylet Replacement: Not replacing the stylet prior to spinal needle removal may cause increased post LP headache incidence. The theory is that a strand of arachnoid, which might enter the needle with the outflowing CSF during LP and upon removal of the needle, be threaded back through the dura to produce prolonged CSF leakage (9758296):

  • Replace Stylet600 LPs performed
  • 300 had stylet replaced vs not replaced before withdrawal of spinal needle
  • Incidence of post LP headache was 16% in the group not having stylet replaced vs 5% in group that did
  • Conclusion: Replacement of stylet before spinal needle withdrawal, decreases incidence of post LP headache

Bed rest after LP: Does bed rest post LP decrease incidence of post LP headache? (23846960)

  • Early AmbulationCochrane Review
  • 12 trials (1519 participants)
  • No beneficial effect on incidence of post LP headache with bed rest vs immediate mobilization (26.4% vs 20.5%; RR 1.30)
  • Conclusion: Patients do better with early ambulation after LP and not bed rest

Also a systematic review looking at bed rest vs early ambulation of LP looking at OR of post LP headache showed (21689866):

  • Any headache (11 studies; 1693 patients) = OR 1.1
  • Postural headache (8 studies; 1254 patients) = OR 1.2
  • Severe postural headache (8 studies; 1342 patients) = OR 1.1
  • Conclusion: Bed rest of any duration after LP does not decrease the incidence of post LP headache

Number of LP attempts: Pathophysiologically it makes sense that the more attempts made at LP the more likely a person is to suffer from post LP headaches. Since post-LP headaches are secondary to persistent CSF leaks, the more trauma caused by the provider, the more likely the patient is to leak CSF and suffer from headaches. What is the evidence?

  • No studies  to date have been conducted to compare one attempt versus multiple attempts (17099089)

Volume of CSF fluid removed: Is the volume of CSF removed a risk factor for headache after LP? (1407567)

  • 501 LPs performed
  • Questionnaire given to patients
  • Mean CSF removal 12.9mL with no post LP headache vs 12.4mL with post LP headache (Not statistically significant)
  • Conclusion: Volume of CSF was not a risk factor for post LP headache

Patient position: Does a sitting versus lateral decubitus position make a difference in incidence of post LP headache? (23846960)

  • Cochrane Review
  • 2 Trials with 120 patients
  • No difference between positions regarding incidence of post LP headache (RR 0.86)
  • Conclusion: The position that LP is performed does not make a difference in post LP headache

IVF prior to lumbar puncture: Does giving IVF prior to lumbar puncture decrease the incidence of post LP headache?  (152937)

  • 100 patients having CT myelography performed
  • 2 L of IVF 2 hours prior to procedure vs no IVF (RR 0.9)
  • Conclusion: IVF prior to LP does not decrease incidence of post LP headache, but may decrease duration of headache > 24 hours.

What is the evidence for the treatments of post lumbar puncture headaches?

Early hydration following LP: Does administration of fluids after LP decrease incidence of post LP headache?

Only one study looked at this: (3203698)

  • 100 patients having LP performed
  • Patients asked to drink oral fluids 1.5L vs 3.0L post LP
  • 64% had no post LP headache in both groups
  • Limitation: Oral hydration post LP evaluated only
  • Conclusion: Oral hydration post LP does not appear to decrease incidence of post LP headache

Caffeine: Does IV caffeine improve post LP headaches? (11788546) (16738291)

  • CoffeeIV caffeine given to 41 patients
  • Persistent headache at 1 – 2 hours post administration
  • Absolute Risk Reduction of 0.68  (NNT 1.6)
  • Limitation: High recurrence of headache (30%)
  • Conclusion: IV caffeine 500mg provides a temporary improvement in symptoms for post LP headache
  • One caveat: One cup of coffee contains about 50 – 100 mg of caffeine and soft drinks contain 35 – 50 mg

Prophylactic Blood Patch:

Blood PatchIt was noticed early on that patients with “traumatic taps” or “bloody taps” had a lower incidence of post-LP headaches. It has been theorized that this may be due to the patient’s own coagulation system helping form a patch over the hole created by the needle in the dura. Once the post-LP headache has already set in, a blood patch made by injecting 10-30 mLs of the patient’s blood into the epidural space can cause resolution of symptoms in 85-98% of cases if done in the first 24 hours (11788546). This is likely due to the coagulating effect of the blood over dural compromise. It makes sense that using prophylactic blood patching immediately after finishing the procedure would help prevent post-LP headaches. However, the data is conflicting. This is likely due to the fact that the studies that have looked at prophylactic blood patching have limited the amount of blood used to 2-3 mLs, which may be insufficient. Data is very supportive of blood patching once the headache has set in.

Conclusion: A blood patch of at least 10 – 30mL is quite effective in treating post LP headaches

Take Home Messages

What Helps Prevent Post LP Headaches:

  1. 20 – 22G needles seems to be the optimal size for diagnostic/therapeutic LPs in adults
  2. Needle bevel parallel to dural fibers
  3. Replacement of stylet before withdrawal of spinal needle
  4. Early ambulation, NOT laying flat post procedure
  5. Number of LP attempts (Never studied, but pathophysiologically makes sense)

What DOES NOT Help Prevent Post LP Headaches:

  1. Volume of CSF removed
  2. Patient Position
  3. IVF prior to LP, but may decrease duration of headache being > 24 hours

Treatment:

  1. Oral hydration after lumbar puncture does not improve treatment (would like to see a study with IVF)
  2. The evidence is weak, but IV or oral caffeine does improve post LP headache, but with a high recurrence rate
  3. Blood patch is an effective treatment for post LP headache

For More on This Topic Checkout:

Bibliography

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Nick Spampinato

PGY-1 Emergency Medicine Resident at University of Texas Health Science Center at San Antonio (UTHSCSA)
REBEL EM Guest Contributor and Author

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6 replies
  1. Justin Cook says:

    Nick, great review. I love the pearls about needle bevel direction and replacement of the stylet for minimizing post-LP headaches. But what about blunt-tipped needles? And has there been any literature on the stylet reinsertion if using blunt-tipped needles? I don’t know any of this literature off the top of my head, but my recollection is that the post-LP headache rate for blunt tipped needles in general is significantly lower than for cutting needles, so much so that I haven’t used a cutting needle in maybe 5 years (except for neonates, just because I’ve never seen a short blunt-tip). Although I’ve found the technique is a bit trickier with a blunt-tip (often have to push harder to get through ligamentum flavum sometimes, almost feels like bone), a 22 Ga Whitacre needle is my go-to in adults for LPs–and for many US-guided nerve blocks. I’d be curious to know what you or others have experienced with these.

    Reply
  2. Mark Culver says:

    Hey Nick – nice review you put together. I would like to point out that from a medication standpoint, IV Caffeine BENZOATE has been on national back order for a few years and IV Caff Citrate is only for neonates. There have been studies looking at oral and IV caffeine with IV being much more likely to work than the evidence for PO. There was one (weaker) study I found that utilized Theophylline. In my experience, we have basically had to utilize pain medications, fluids (no evidence, but we do) and strong coffee/NoDoz… but the best evidence I’ve seen medication-wise is definitely IV Caffeine Benzoate; maybe someday these national backorders will be resolved.

    Reply

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