A message from the minefield.
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Biomedical subjects
Publications and source records attributed to J Edmeads.
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Neck disorders implicated as causes of headache fall into two groups: a) those in which the cervical lesions are unequivocally demonstrable, and in which treatment of those lesions helps the headache; these are widely accepted as causes of headache, and include: congenital and acquired craniovertebral junction disorders, rheumatoid arthritis and ankylosing spondylitis of the upper cervical spine, and dissection or trauma to the carotid or vertebral arteries; b) those in which the neck disorder is either banal or not objectively demonstrable, and which seldom improve following treatment of the neck; these are not widely accepted as causes of headache; they include whiplash syndrome, segmental hypomobility-hypermobility syndrome, the posterior cervical sympathetic syndrome, cervical migraine, third occipital nerve headache, and cervicogenic headache. Features of a headache suggesting its cervical origin are: 1) abrupt onset following sudden excessive movement of the head; 2) persistent unilateral suboccipital or occipital pain; 3) consistent reproduction by neck movements and by nothing else; 4) abnormal postures of head and neck; 5) significant painful limitation of movement of upper cervical spine; 6) abnormal mobility at craniovertebral junction; 7) C2 sensory abnormalities or lower medulla or upper cervical cord signs.
Dizziness is a common but often nonspecific symptom. Through careful history taking and physical examination, primary care physicians can usually determine the type of sensation (vertigo or light-headedness) and its source. Although most causes of dizziness are benign, disorders of the central nervous system tend to be ominous and require immediate referral to a specialist.
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The first step in management of migraine is convincing the patient of the diagnosis. Once this has been accomplished, the physician needs to identify precipitating factors. Common migraine triggers include stress, menstruation, use of oral contraceptives, and certain foods. The next step is choosing appropriate therapy. Analgesics are most commonly prescribed in North America; nonsteroidal antiinflammatory drugs, ergotamine, narcotics, corticosteroids, and other drugs are also useful. Prophylactic therapy should be considered when treatment of individual attacks fails, causes adverse effects, or leads to dependence.
Headache is always a challenging diagnostic exercise but is especially so in patients who have "the worst headache ever." Such a headache should never be automatically dismissed as merely a severe but benign one. A thorough history and careful physical examination are necessary to find evidence of serious disease. If such evidence is present, immediate, aggressive, and thorough evaluation are essential to avoid severe consequences.
In most cases, patients presenting with "the worst headache ever" are found to have a benign condition, notably migraine, toxic vascular headache, or exertion-induced headache. However, ominous causes first must be excluded by appropriate investigation, such as computed tomographic or magnetic resonance imaging scans and lumbar puncture. When an ominous cause has been ruled out, appropriate therapy can be started.
In some forms of cerebrovascular disease, such as intracranial hemorrhage, headaches are well known as a prominent symptom and often are a valuable clue to diagnosis. There are difficulties, sometimes, in distinguishing between a small subarachnoid hemorrhage and a severe migraine headache, but these can be resolved using clinical observations, CT scan, and lumbar puncture. It seems less well known that headaches may accompany or precede cerebral thrombosis and embolism. When these headaches are recognized as a forerunner to stroke, they may allow an opportunity for preventive treatment.
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