What are the clinical presentation, investigation findings, and treatment outcomes of spontaneous intracranial hypotension?
This systematic review and meta-analysis of 144 articles provides a summary of the evidence on spontaneous intracranial hypotension and demonstrates that a significant minority of patients may have nonorthostatic headache, normal lumbar punctures, or normal imaging results. Treatment with 1 epidural blood patch is often successful, with large-volume blood patches giving better outcomes.
A diagnosis of spontaneous intracranial hypotension should not be excluded based on the absence of one of its typical features; large epidural blood patches should be attempted if conservative treatment has failed.
Spontaneous intracranial hypotension (SIH) is a highly disabling but often misdiagnosed disorder. The best management options for patients with SIH are still uncertain.
To provide an objective summary of the available evidence on the clinical presentation, investigations findings, and treatment outcomes for SIH.
Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) reporting guideline–compliant systematic review and meta-analysis of the literature on SIH. Three databases were searched from inception to April 30, 2020: PubMed/MEDLINE, Embase, and Cochrane. The following search terms were used in each database: spontaneous intracranial hypotension, low CSF syndrome, low CSF pressure syndrome, low CSF volume syndrome, intracranial hypotension, low CSF pressure, low CSF volume, CSF hypovolemia, CSF hypovolaemia, spontaneous spinal CSF leak, spinal CSF leak, and CSF leak syndrome.
Original studies in English language reporting 10 or more patients with SIH were selected by consensus.
Data Extraction and Synthesis
Data on clinical presentation, investigations findings, and treatment outcomes were collected and summarized by multiple observers. Random-effect meta-analyses were used to calculate pooled estimates of means and proportions.
Main Outcomes and Measures
The predetermined main outcomes were the pooled estimate proportions of symptoms of SIH, imaging findings (brain and spinal imaging), and treatment outcomes (conservative, epidural blood patches, and surgical).
Of 6878 articles, 144 met the selection criteria and reported on average 53 patients with SIH each (range, 10-568 patients). The most common symptoms were orthostatic headache (92% [95% CI, 87%-96%]), nausea (54% [95% CI, 46%-62%]), and neck pain/stiffness (43% [95% CI, 32%-53%]). Brain magnetic resonance imaging was the most sensitive investigation, with diffuse pachymeningeal enhancement identified in 73% (95% CI, 67%-80%) of patients. Brain magnetic resonance imaging findings were normal in 19% (95% CI, 13%-24%) of patients. Spinal neuroimaging identified extradural cerebrospinal fluid in 48% to 76% of patients. Digital subtraction myelography and magnetic resonance myelography with intrathecal gadolinium had high sensitivity in identifying the exact leak site. Lumbar puncture opening pressures were low, normal (60-200 mm H2O), and high in 67% (95% CI, 54%-80%), 32% (95% CI, 20%-44%), and 3% (95% CI, 1%-6%), respectively. Conservative treatment was effective in 28% (95% CI, 18%-37%) of patients and a single epidural blood patch was successful in 64% (95% CI, 56%-72%). Large epidural blood patches (>20 mL) had better success rates than small epidural blood patches (77% [95% CI, 63%-91%] and 66% [95% CI, 55%-77%], respectively).
Conclusions and Relevance
Spontaneous intracranial hypotension should not be excluded on the basis of a nonorthostatic headache, normal neuroimaging findings, or normal lumbar puncture opening pressure. Despite the heterogeneous nature of the studies available in the literature and the lack of controlled interventional studies, this systematic review offers a comprehensive and objective summary of the evidence on SIH that could be useful in guiding clinical practice and future research.
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CME Disclosure Statement: Unless noted, all individuals in control of content reported no relevant financial relationships. If applicable, all relevant financial relationships have been mitigated.
Corresponding Author: Manjit Singh Matharu, MD, PhD, Headache and Facial Pain Group, UCL Queen Square Institute of Neurology, The National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, United Kingdom (firstname.lastname@example.org).
Accepted for Publication: October 16, 2020.
Published Online: January 4, 2021. doi:10.1001/jamaneurol.2020.4799
Open Access: This is an open access article distributed under the terms of the CC-BY License. © 2021 D’Antona L et al. JAMA Neurology.
Author Contributions: Drs D’Antona and Matharu had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Concept and design: D’Antona, Vassiliou, Watkins, Toma, Matharu.
Acquisition, analysis, or interpretation of data: D’Antona, Jaime Merchan, Vassiliou, Watkins, Davagnanam, Matharu.
Drafting of the manuscript: D’Antona, Vassiliou, Davagnanam, Matharu.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: D’Antona, Vassiliou, Matharu.
Obtained funding: Watkins, Matharu.
Administrative, technical, or material support: Jaime Merchan, Vassiliou, Watkins, Matharu.
Supervision: Watkins, Davagnanam, Toma, Matharu.
Conflict of Interest Disclosures: Dr D’Antona is supported by a National Institute for Health Research Academic Clinical Fellowship and was the recipient of a research fellowship sponsored by B. Braun. Dr Watkins reports support research from B. Braun, personal fees from Codman for serving on educational courses and advisory boards, and personal fees from Medtronic for serving on advisory boards outside the submitted work. Mr Toma’s research time was supported by the National Institute for Health Research University College London Hospitals Biomedical Research Centre. Dr Matharu reports serving on the advisory boards of Allergan, Novartis, Eli Lilly and Company, Autonomic Technologies, and Teva Pharmaceuticals; payment for the development of educational presentations from Allergan, electroCore, Eli Lilly and Company, Novartis, and Teva Pharmaceuticals; grants from Abbott, Medtronic, Allergan, and electroCore; personal fees from Allergan, Eli Lilly and Company, and Teva Pharmaceuticals, outside the submitted work; and has a patent for WO2018051103A1 issued. No other disclosures were reported.
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