ANTIHYPERTENSIVE EFFECTS OF β-BLOCKERS IN HYPERTENSIVE RATS

Abstract
Wister-Imamichi rats of either sex, weighing between 180 and 350 g were used to induce renal and dihydroxycorticosterone acetate [DOCA]-hypertension. SHR [spontaneously hypertensive rats] were also studied. DOCA (50 mg/kg) was injected s.c. once a week, as 25 mg/ml suspension in 4% gum arabic after unilateral nephrectomy (left kidney). Instead of tap water 1% NaCl was given as drinking water. Renal hypertension was produced, by placing a clamp made from silver ribbon around the left renal artery (slit width, 0.2 mm), without contralateral nephrectomy. Administration of .beta.-blockers was started 2 days after operation in these 2 types of experiments. Neither pindolol nor propranolol produced antihypertensive effects.

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