Abstract
The effect of PTH infusion on PRA was evaluated in 22 normotensive subjects. Intravenous infusion of PTH produced an increase in PRA in studied subjects. This increase in PRA was dose dependent from 1.505 +/- 0.226 to 2.500 +/- 0.346 nmol/l/hour after administration of 100 units of PTH and from 1.648 +/- 0.189 to 4.294 +/- 0.614 nmol/l/hour after 200 units of PTH and was markedly decreased by a beta blocking drug from 1.660 +/- 0.259 to 2.498 +/- 0.485 nmol/l/hour. These responses were observed without any significant changes in plasma calcium and blood pressure. From our results we can conclude that PTH increases PRA in normotensive controls. This effect is partly blocked by beta adrenergic blockers.
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