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- W1972123778 abstract "The adrenergic status was studied through evaluation of platelet alpha 2-adrenoceptor number [( 3H]yohimbine binding sites), plasma catecholamine levels and blood pressure response to noradrenaline infusion in three groups of subjects (1) Parkinsonians with orthostatic hypotension; (2) Parkinsonians without orthostatic hypotension; and (3) control subjects. In Parkinsonians with orthostatic hypotension, systolic and diastolic blood pressures significantly (P less than 0.05) decreased from 144 +/- 9 and 76 +/- 6 mmHg in the lying position to 95 +/- 12 and 60 +/- 7 mmHg after 5 min standing. In these patients, noradrenaline plasma levels were significantly low (62 +/- 11 pg ml-1, (P less than 0.05) when compared with controls (219 +/- 13 pg ml-1) whereas no difference was noticed in Parkinsonians without orthostatic hypotension (195 +/- 14 pg ml-1). The noradrenaline dose required for a 25 mmHg increase in systolic blood pressure was significantly (P less than 0.01) lower in Parkinsonians with orthostatic hypotension (0.19 +/- 0.03 microgram kg-1) when compared with Parkinsonians without orthostatic hypotension (0.86 +/- 0.11 microgram kg-1) or with controls (0.68 +/- 0.1 microgram kg-1). Platelet alpha 2-adrenoceptor number was higher in Parkinsonians with orthostatic hypotension (313 +/- 52 fmol mg-1 protein) than in Parkinsonians without orthostatic hypotension (168 +/- 9 fmol mg-1 protein) or in controls (175 +/- 4 fmol mg-1 protein) with no change in Kd. This study demonstrates that in patients with Parkinson's disease, orthostatic hypotension is associated with an increase in both vascular sensitivity to noradrenaline and platelet alpha 2-adrenoceptor number.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1972123778 date "2008-06-28" @default.
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- W1972123778 title "Adrenergic supersensitivity in Parkinsonians with orthostatic hypotension" @default.
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- W1972123778 doi "https://doi.org/10.1111/j.1365-2362.1990.tb01909.x" @default.
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