Rat neonates renal function after beta-receptors and adrenoceptors blockade during pregnancy

Pregnant Wistar rats were given by subcutaneous route 1 of 3 different adrenoreceptor blockers, 2 of them mainly beta-blockers. P5 and P7 group received propranolol (5 and 7 mg/kg respectively), L10 and L20 groups received labetalol (10 and 20 mg/kg) and B5 group received betaxolol (5 mg/kg). Drugs were given daily from the 7th to the 16th day of gestation. A control group received saline injections. 16 out 24 treated mothers delivered prematurely on the 21st day of gestation. Functional renal parameters were studied in neonates on the first day of life. Renal function of the full term rats prenatally exposed were compared with controls. Average body weight was higher in P5 but lower in L10-L20-B5 groups. Diuresis increased in L20. Creatinine clearance, urinary/plasmatic creatinine ratio and urea clearance decreased in L10-L20 groups and fractional excretion of H2O increased in L20. Thus these adreno- and beta-blockers given to pregnant rats induced a shorter gestation. Moderate functional renal effects were observed in all neonates.