Efectos hemodinámicos de la supresión del propranolol en ratas

the effect of the suppression of the treatment with propranolol (0,5 mg/100 g rat/day) in aquous solution on blood volume and other hemodynamic variables was studied in 20 white rats. at the same time 20 con-trols were carried out to which distilled water was administered. the systolic arterial pressure was measured 20 days after the beginning of treatment, and 20 and 45 days after its suppression. 45 days after the drug's suppression, blood volume was measured in a subgroup of ten, using evans' blue as an indicator substance. mean arterial pressure, mean circulatory pressure, and central venous pressure were measured in the other subgroup by using a 4-channel polygraph. as a result, a marked increase of blood volume, plasma volume, and heart frequency was obtained. a highly significant rise of mean arterial pressure, systolic arterial pressure, central venous pressure, and mean circulatory pressure was also observed. according to the results, it is concluded that propranolol's suppression causes hydrosaline retention resulting from tubular hypertrophy, which could make even more clear the role of kidney in essential arterial hypertension.