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Spinal Epidural Hematoma After Neuraxial Anesthesia
Spinal and epidural anesthesia are used every day for joint replacement, cesarean delivery, labor analgesia, and many other procedures. A spinal or epidural hematoma, meaning bleeding into the spinal canal that presses on the spinal cord or nerve roots, is one of the rarest complications of these techniques. It is also one of the most serious, because permanent weakness, numbness, or bowel and bladder dysfunction can follow.
These cases tend to raise three groups of questions. The first is the decision to place the block, especially in a patient taking blood thinners. The second is whether early signs were recognized and acted on in time. The third is whether the neuraxial procedure caused the hematoma at all. This article sets out how a physician expert approaches each one.
Why a rare complication gets close scrutiny
The American Society of Regional Anesthesia and Pain Medicine (ASRA) describes hemorrhagic complications of regional anesthesia as extremely rare and potentially catastrophic. Because they are so rare, large randomized trials are not feasible. Much of the guidance therefore comes from case series, pharmacology, and expert consensus. Vandermeulen and colleagues' review Anticoagulants and spinal-epidural anesthesia (Anesthesia & Analgesia, 1994) is a foundational early paper on this question.
The guidelines that frame the standard-of-care discussion
ASRA publishes evidence-based guidelines on regional anesthesia in patients receiving antithrombotic or thrombolytic therapy.
- Fourth edition (Horlocker and colleagues, 2018) in Regional Anesthesia and Pain Medicine.
- Fifth edition (Kopp and colleagues, 2025) in the same journal. The authors describe it as reviewing the evidence published since 2018 and keeping an "antihemorrhagic" approach that puts patient safety first. Where the evidence is limited, it proposes conservative times for stopping these medications before neural blockade. It replaces the terms "prophylactic" and "therapeutic" with "low dose" and "high dose." It also suggests when drug-specific laboratory assays may be helpful.
For obstetric patients, the Society for Obstetric Anesthesia and Perinatology (SOAP) published a consensus statement on anesthetic management of pregnant and postpartum women receiving thromboprophylaxis or higher-dose anticoagulants (Leffert and colleagues, Anesthesia & Analgesia, 2018).
Two points matter when care is reviewed. First, guidance has changed over time. An expert should identify which edition, and which institutional policy, was in place on the date of care, rather than judging earlier care against later recommendations. Second, guidelines support clinical judgment but do not replace it. Departing from a guideline with a documented rationale is different from not considering it at all.
Low platelet counts raise a related question. Dr. Urits co-authored Thrombocytopenia and neuraxial anesthesia: Are there platelet count thresholds? (Herman and colleagues, Journal of Clinical Anesthesia, 2020). It examines whether a single platelet number can define when neuraxial anesthesia is safe.
Standard-of-care questions before the block
- Was a complete medication history obtained, including anticoagulants, antiplatelet drugs, and over-the-counter agents, and was the timing of the last dose documented?
- Were relevant laboratory values available and reviewed where indicated?
- Were the risks and benefits of a neuraxial technique weighed against alternatives such as general anesthesia or a peripheral block?
- Did the informed consent discussion cover bleeding and neurologic risk?
- Were placement, any catheter, and later catheter removal timed appropriately against anticoagulant doses given before and after surgery?
Recognition and response after the block
Timing often matters most in these cases. In their meta-analysis of 613 patients with spinal hematoma, Kreppel and colleagues (Neurosurgical Review, 2003) found that 39.6% recovered completely. They identified MRI as the examination of first choice and surgical decompression as the treatment of choice. They also reported that patients with less severe symptoms before surgery, and those decompressed sooner, had better chances of complete recovery.
Typical record-review questions:
- Were neurologic checks ordered and performed at reasonable intervals, particularly with an epidural catheter in place or anticoagulation resumed?
- Was new or worsening weakness or numbness assessed promptly, rather than assumed to be the expected effect of the local anesthetic?
- When concern arose, how long did it take to stop the infusion, obtain imaging, and consult a spine surgeon?
- Was communication among anesthesia, nursing, and surgical teams documented?
A time-stamped reconstruction of the nursing flowsheets, medication administration record, imaging orders, and consult notes is often the core of the analysis.
Causation: not every spinal hematoma comes from the needle
Spinal hematomas also occur in patients who never had a neuraxial procedure. In Kreppel's series, no cause could be identified in up to 29.7% of cases. Hematomas linked to anticoagulant therapy and to vascular malformations were the second and third most common groups. Spinal and epidural procedures combined with anticoagulation ranked fifth. Causation analysis therefore considers:
- the location and level of the hematoma relative to the puncture site;
- the timing of symptoms relative to needle placement, catheter removal, and anticoagulant doses;
- patient factors such as coagulopathy, kidney function, spinal anatomy, and vascular abnormalities; and
- whether earlier recognition would likely have changed the neurologic outcome.
Dr. Urits has also written on spinal epidural hematoma outside the anesthesia setting. He is the author of a case report on the diagnosis and spontaneous resolution of an epidural hematoma after a cervical epidural steroid injection (Pain Management Case Reports, 2018).
Records that usually matter
- Medication reconciliation and anticoagulant/antiplatelet administration records, with exact times
- Coagulation and platelet results
- Anesthesia record, neuraxial procedure note, and catheter insertion and removal documentation
- Epidural infusion orders and pump records
- Nursing neurologic assessments and PACU or labor and delivery flowsheets
- MRI and CT orders and results with timestamps, plus neurosurgical consult and operative notes
- The institution's neuraxial and anticoagulation policy in effect on the date of care
Key takeaways
- Spinal epidural hematoma is rare. Safety questions usually center on anticoagulant timing, monitoring, and how quickly a new deficit was acted on.
- ASRA's antithrombotic guidelines (fourth edition, 2018; fifth edition, 2025) and the SOAP obstetric consensus statement are central references. The version in effect on the date of care matters.
- Causation requires separating procedure-related bleeding from spontaneous or anticoagulant-related hematomas, and analyzing whether timing affected the outcome.
References
- Vandermeulen EP, Van Aken H, Vermylen J. Anticoagulants and spinal-epidural anesthesia. Anesth Analg. 1994;79(6):1165-1177. Abstract: https://pubmed.ncbi.nlm.nih.gov/7978443/
- Horlocker TT, Vandermeuelen E, Kopp SL, et al. Regional Anesthesia in the Patient Receiving Antithrombotic or Thrombolytic Therapy: American Society of Regional Anesthesia and Pain Medicine Evidence-Based Guidelines (Fourth Edition). Reg Anesth Pain Med. 2018;43(3):263-309. Abstract: https://pubmed.ncbi.nlm.nih.gov/29561531/
- Kopp SL, Vandermeulen E, McBane RD, Perlas A, Leffert L, Horlocker T. Regional anesthesia in the patient receiving antithrombotic or thrombolytic therapy: American Society of Regional Anesthesia and Pain Medicine Evidence-Based Guidelines (fifth edition). Reg Anesth Pain Med. 2025. doi:10.1136/rapm-2024-105766. Abstract: https://pubmed.ncbi.nlm.nih.gov/39880411/
- Leffert L, Butwick A, Carvalho B, et al. The Society for Obstetric Anesthesia and Perinatology Consensus Statement on the Anesthetic Management of Pregnant and Postpartum Women Receiving Thromboprophylaxis or Higher Dose Anticoagulants. Anesth Analg. 2018;126(3):928-944. Abstract: https://pubmed.ncbi.nlm.nih.gov/29099429/
- Kreppel D, Antoniadis G, Seeling W. Spinal hematoma: a literature survey with meta-analysis of 613 patients. Neurosurg Rev. 2003;26(1):1-49. Abstract: https://pubmed.ncbi.nlm.nih.gov/12520314/
- Herman JA, Urits I, Kaye AD, Urman RD, Viswanath O. Thrombocytopenia and neuraxial anesthesia: Are there platelet count thresholds? J Clin Anesth. 2020;63:109751. Abstract: https://pubmed.ncbi.nlm.nih.gov/32145501/
- Urits I. Diagnosis and spontaneous resolution of an epidural hematoma in a patient presenting after cervical epidural steroid injection. Pain Management Case Reports. 2018. doi:10.36076/pmcr.2018/2/213. DOI: https://doi.org/10.36076/pmcr.2018/2/213 (not indexed in PubMed)
Related: Regional Anesthesia and Nerve Block Cases
Educational information only. Not legal or medical advice.
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