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Factors contributing to the maintenance of arterial blood pressure in adult rats treated neonatally with guanethidine

Factors contributing to the maintenance of arterial blood pressure in adult rats treated neonatally with guanethidine

Clinical and Experimental Hypertension. Part A Theory and Practice 8(8): 1373-1394

ISSN/ISBN: 0730-0077

PMID: 2949895

DOI: 10.3109/10641968609044093

Adult rats treated neonatally with guanethidine had normal arterial blood pressures, but these were more dependent on the renin-angiotensin system than in control animals. Antagonism of V1-receptors (with d(CH2)5DAVP) enhanced the depressor effects of captopril in guanethidine-treated animals, but blood pressure was unaffected by this manouevre in control animals. Although there is evidence that sympathetic efferent vasomotor function is abolished following the schedule of neonatal guanethidine treatment used, pentolinium had a hypotensive effect in the presence of d(CH2)5DAVP and captopril, indicating that the adrenal medulla could have been contributing to the maintenance of blood pressure. This is consistent with the finding of marked supersensitivity to exogenous adrenaline in guanethidine-treated rats.

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Accession: 005441147

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