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Methacholine induced headache.
  1. C Carratala,
  2. J G Gea,
  3. M C Aguar,
  4. S Grau,
  5. J M Espadaler-Medina,
  6. J M Broquetas
  1. Department of Pneumology, Hospital del Mar, IMIM Universitat Autònoma de Barcelona, Spain.


    A lung function technician developed episodes of headache, probably related to the use of methacholine. The headache disappeared with breathing 100% oxygen. Cholinergic agents are known to induce headaches but the mechanism remains unclear. Vascular factors could be implicated.

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