EBQ:Worst headache and subarachnoid hemorrhage

Complete Journal Club Article
Linn FH, Wijdicks EF, van der Graaf Y, Weerdesteyn-van Vliet FA, Bartelds AI, van Gijn J.. "Headache Characteristics in Subarachnoid Haemorrhage and Benign Thunderclap Headache". J Neurol Neurosurg Psychiatry. 1998. 65(5):791-793.
PubMed

Clinical Question

Can "worst headache of life" or specific headache characteristics reliably distinguish subarachnoid hemorrhage from benign thunderclap headache?

Conclusion

  • No single headache characteristic reliably distinguishes SAH from benign thunderclap headache
  • "Worst headache of life" alone has poor specificity for SAH
  • Further diagnostic workup (CT, LP) is required regardless of headache characteristics when SAH is suspected

Major Points

  • The study compared headache features in patients with confirmed SAH vs benign thunderclap headache
  • Headache severity, onset pattern (sudden vs gradual), associated symptoms (nausea, vomiting, LOC) overlapped significantly between groups
  • Approximately 12% of patients presenting with "worst headache" had SAH
  • Neither the location nor the quality of headache was discriminating
  • The study reinforced the need for objective diagnostic testing (CT followed by LP if CT negative) rather than relying on headache phenomenology

Study Design

  • Prospective cohort study
  • University Medical Center Utrecht, Netherlands
  • N = 148 patients with sudden severe headache
  • All patients underwent CT and lumbar puncture
  • Primary Outcome: headache characteristics that discriminate SAH from benign thunderclap headache

Population

Inclusion Criteria

  • Adults presenting with sudden onset severe headache (thunderclap headache)
  • Headache reaching maximal intensity within seconds to minutes

Exclusion Criteria

  • Headache with obvious secondary cause other than SAH (e.g., meningitis, trauma)
  • Recurrent primary headache disorders with typical pattern

Interventions

  • No therapeutic intervention; diagnostic accuracy study
  • All patients underwent standardized headache assessment, non-contrast CT head, and lumbar puncture
  • SAH was confirmed by CT findings or xanthochromia on CSF analysis

Outcomes

Primary Outcome

  • No headache characteristic was independently predictive of SAH vs benign thunderclap headache
  • Proportion with SAH: approximately 12% of patients with worst headache

Secondary Outcomes

  • Overlap in headache features between SAH and benign thunderclap headache:
    • Sudden onset: present in both groups
    • Occipital location: similar frequency
    • Associated neck stiffness: more common in SAH but present in benign thunderclap
    • Vomiting: more common in SAH but not discriminating

Criticisms

  • Relatively small sample size limits statistical power for subgroup analyses
  • Single-center study in a Dutch referral population
  • The definition of "thunderclap headache" may vary between practitioners
  • Selection bias: patients with milder headaches who may represent earlier SAH presentations may not have been included
  • The study did not evaluate modern risk stratification tools (e.g., Ottawa SAH Rule)

Funding

  • Netherlands Heart Foundation

See Also

References

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