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Abstract
1. For comparable blood pressures, plasma noradrenaline is disproportionately higher in patients with phaeochromocytoma than in those with essential hypertension. 2. The ‘pressor-dose’ of noradrenaline or its reciprocal, the reactivity index, were abnormal in patients with phaeochromocytoma before surgery and made normal by surgical removal of the phaeochromocytoma. 3. There was a significant correlation between blood pressures and the logarithm of plasma noradrenaline concentrations. 4. The higher dose of exogenous noradrenaline required in patients with phaeochromocytoma for a given rise in blood pressure seems to be the expression of the higher levels of endogenous noradrenaline rather than true decreased reactivity.
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