was effective in 1 out of 8 cases. Oxygen therapy was not used in our patients.
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Discussion
Cluster headache is often misdiagnosed and confused with other neurological disorders. Klapper et al6 reported an average delay of 6.6 years in the diagnosis of cluster headache. The authors also showed that 87% of the investigated cluster headache patients met the International Classification of Headache Disorders–II criteria for cluster headache, and should have been diagnosed by the first physician seen. An average of 4.3 physicians was seen and an average of 3.9 incorrect diagnoses was made before the diagnosis of cluster headache. Before the final correct diagnosis, patients consulted other medical specialists, such as dentists and otolaryngologists. Childhood onset, presence of nausea, vomiting, and photophobia during cluster headache attacks, alternating side of attack and episodic type of attacks were the main causes of initial misdiagnosis.