The cent of diagnosis and optimal m...

The cent of diagnosis and optimal management of cluster headache remain challenging. This principally painful of primary headaches affects 01 per-adults. (1) The male-to-female ratio has diminished from 62 to 1 in the 1960 to 21 to 1 in the 1990 (2) Men may first experience cluster headache in their early 20 with peak attack in their 40s. In the same study, (3) the most oft-repeated age at onset for women was in their 60 Cluster headache may be underdiagnosed in black women (4) however ethnic differences in prevalence have not been studied. Having a family history of headaches, smoking, head injury, or shift work has been associated with cluster headache.

Clinical Features and Classification

In 2004 the International Headache Society published of recent origin criteria for diagnosing cluster headache. To fulfill criteria for diagnosis, patients must have had at least five attacks occurring from united every other day to eight by day; and attributable to no other disorder. (5) In addition, headaches must cause plain or very severe unilateral orbital, supraorbital, or temporal pain lasting 15 to 180 minutes if untreated, and be accompanied on one or more of the following: ipsilateral conjunctival injection or lacrimation, ipsilateral nasal congestion or rhinorrhea, ipsilateral eyelid edema, ipsilateral forehead and facial sweating, ipsilateral miosis or ptosis, or a faculty of perception of restlessness or agitation. (5) Episodic cluster headache is defined as at least pair cluster periods lasting seven to 365 days and separated on pain-free remission periods of common month or longer. Chronic attacks run in the mind over more than one year without remission or with remission lasting les than undivided month. (5)

Called "suicide headache" because of its severity and "alarm clock" headache because of its periodicity, cluster headache is characterized on unilateral excruciating pain (a hot-poker or stabbing sensation) in the ocular, frontal, or temporal areas. Pain frequently radiates to the upper teeth jaw, and neck Associated signs include ptosis, ipsilateral lacrimation, conjunctival injection, and rhinorrhea. The pain usually is unilateral, with 60 percent of patients reporting headaches forward the right side, but 14 percent of patients report a side shift during an attack, and 18 percent report involvement of different sides in following attacks. (6)

Other symptoms include facial flushing or pallor, tendernes forward palpation of the ipsilateral carotid artery, bradycardia, and abnormal feeling of scalp hairs. The absence of aura, nausea, or vomiting has helped distinguish cluster from migraine headaches, still recent studies indicate that 14 percent of patients with cluster headache experience aura, 51 percent have a personal or family history of migraine, 56 percent report photophobia, 43 percent report phonophobia, and 23 percent report osmophobia. (7) Thus, the demeanor of aura, nausea, vomiting, or photophobia should not empire out a diagnosis of cluster headache. (8) A characteristic feature of cluster headache, noted by the agency of 93 percent of patients in single in kind study, (7) is restlessness, with behaviors as it was as pacing and rocking the head and stock with head in hands. (9) principally of these headaches last 15 minutes to three hours and run in the mind at the same time of day, frequently at night. Many attacks begin during the first rapid-eye-movement be dead phase. Patients may report a seasonal pattern, with spring and autumn peaks.

Cluster headache is diagnosed at history, and the key feature is a pattern of intermittent bouts of near-daily attacks lasting for days, weeks, or month Patients fearing an attack may be afraid to fare to sleep. Precipitants of cluster headache include hypoxia, which may come about with sleep apnea. Vasodilators as it is as nitroglycerin, alcohol, and carbon dioxide may trigger a headache during a cluster period. (10)

Although similar to cluster headache, paroxysmal hemicrania headaches are briefer and are treated effectively with indomethacin. (5) Orbital myositis may mimic cluster headache, unless the headache has a longer duration.

Etiology

Positron emission tomographic (PET) scanning and functional magnetic resonance imaging are helping to clarify the poorly understood etiology of cluster headache. The basic pathophysiology is in the hypothalamic gray matter. (11) In a certain families, an autosomal dominant gene may be involved, moreover calcium channel activity or nitric oxide sensitivity alleles have not been identified. (12) Carotid and ophthalmic artery vasodilation and an increased sensitivity to vasodilator stimuli during an attack may be triggered by dint of trigeminal parasympathetic reflexes. Abnormal heart rate variability and increased nocturnal lipolysis during attacks and in remission reinforce the theory of an autonomic function abnormality with increased parasympathetic drive and decreased sympathetic function. Attacks frequently begin during sleep, implicating a disorder of circadian periodical emphasis (13) An increased incidence of lie in the grave apnea in patients with cluster headache proposes that periods of reduced oxygenation of explanation tissues may trigger an attack. (14)