Hemicrania continua (HC) is a primary headache syndrome marked by a continuous one-sided headache typically of low-grade intensity with exacerbation periods of increased pain intensity and associated migrainous and autonomic symptoms (1). HC is one of the indomethacin-responsive headache disorders and is part of the trigeminalautonomic spectrum of headaches. The response to indomethacin is fast and dramatic and helps to define the syndrome. Very few other agents have demonstrated any response in HC. Recently, positron emission tomography (PET) imaging has shed some light on the possible pathogenesis of HC (2). Activation was noted in the contralateral posterior hypothalamus and ipsilateral dorsal rostral pons in seven patients with indomethacin-sensitive HC. In several recent case reports HC has been observed to occur in patients with a concomitant history of migraine (3) or cluster headache (4). As both the hypothalamus (possible cluster headache generator) and pons (possible migraine generator or modulator) are activated in HC, it would seem likely that we should be seeing more of these dual headache presentations.A patient is presented who had a history of verapamil-responsive episodic cluster headache and who began to develop a new continuous headache contralateral to her cluster headache side. This headache was indomethacin responsive and a diagnosis of HC was made. Verapamil was tried as a HC preventive and the patient became pain free on verapamil with a very small dose of concomitant daily indomethacin. This case suggests that HC may respond to non-indomethacin treatments when it occurs in individuals with other trigeminalautonomic cephalgias (TAC). This is an important observation, when the long-term possible sideeffects of daily indomethacin are considered.
Case reportA 24-year-old woman presented with a 6-year history of episodic cluster headache. The headaches always occurred on the left side. They were severe in intensity, caused retro-orbital pain, lasted 45 min and were associated with unilateral ptosis, conjunctival injection, lacrimation, nasal congestion and rhinorrhoea. During the headache she would pace, press her hand into her left temple region and shake her legs. She would experience two attacks per day and her typical cluster period lasted 2-3 months. She had some response to valproic acid as a preventive but was never pain free on medication during a cluster cycle. At her first visit (1 month into a cluster headache cycle), verapamil was begun and at a dose of 480 mg/day she became pain free. Since that time with every subsequent cluster headache cycle verapamil has allowed the patient to become pain free during a cluster period. While in a cluster headache remission period she began to develop a new type of headache. This was right-sided, behind her eye with some occipito-nuchal discomfort. The pain was constantly present with no pain-free moments but was of low-grade intensity. Almost daily around noontime the pain intensity would rise to severe and was associated with migrainous featur...