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Regional cerebral blood flow in acute hypertension induced by adrenaline, noradrenaline and phenylephrine in the conscious rat

1989; Wiley; Volume: 137; Issue: 1 Linguagem: Inglês

10.1111/j.1748-1716.1989.tb08725.x

1365-201X

Tageldin Sokrab, Berit Johansson,

Optical Imaging and Spectroscopy Techniques

Hypertension was induced in conscious rats by intravenous infusion of phenylephrine (3, 6 or 12 μg kg ‐1 min ‐1 ), noradrenaline (3 μg min ‐1 ) or adrenaline (3 μg kg ‐1 min ‐1 ). Local cerebral blood flow was measured autoradiographically in 24 defined brain structures using [ 14 C]iodoantipyrine as the diffusible tracer. The mean arterial pressure induced by adrenaline, noradrenaline and the two higher doses of phenylephrine was 158–168 mmHg with no significant differences between the groups. Only adrenaline significantly increased local cerebral blood flow in nine of the 24 structures studied. The smaller capacity for autoregulation after adrenaline compared with other drugs might be related to a β‐adrenoreceptor‐stimulating effect.