The pressor responses to oral and intravenous tyramine were not different from controls in migrainous patients with or without a history of attacks triggered by foods. However, patients who reported a dietary trigger were more likely to develop headache after tyramine administration than those without such a dietary history. Pressor responses to intravenous tyramine in patients with cluster headache were indistinguishable from controls. A group of five males with platelet monoamine oxidase activity one standard deviation or more below that of male controls required less intravenous tyramine to raise blood pressure by 30 mm Hg than males with monoamine oxidase levels within one standard deviation of the controls. This finding suggests that platelet monoamine oxidase activity to some extent reflects that of total body monoamine oxidase A plus B.
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