"Hemicrania continua". An indomethacin responsive headache. II. Autonomic function studies.

Various autonomic parameters have been studied in two patients with "hemicrania continua", a newly described unilateral headache which is aborted by indomethacin. Striking findings were made on pupillometry: In both patients, isocoria was present when untreated. Bilateral instillation of tyramine in the conjunctival sac resulted in a late appearing anisocoria, with the smaller pupil on the symptomatic side. Indomethacin medication corrected this anomaly. These findings add further evidence to our firm belief that "hemicrania continua" differs fundamentally from chronic paroxysmal hemicrania, where such pupillometric changes are not found. There thus seem to be at least two different types of hemicranias with an absolute indomethacin effect.