The 24-hour urinary excretion of prostaglandins (PGs) E2 and F2(α) (which reflects the renal synthesis of these substances) was measured by radioimmunoassay in normal nonpregnant women (NW, n = 23), nonpregnant women suffering from essential hypertension (HW, n = 23), normal pregnant women (NP, n = 24) and women with hypertension in pregnancy (HP, n = 14). All pregnant women were in the third trimester of their pregnancy (week 24-40). The excretion of both PGE2 and PGF2(α) was increased in NP as compared to NW. PGF2(α) was relatively more elevated leading to a decreased PGE2/PGF2(α) ratio. In HP, PGE2 and PGF2(α) excretions were even greater, and the PGE2/PGF2(α) ratio was even lower than in NP. This contrasted with the lowered PGE2 excretion in HW. The increased renal PGs synthesis in normal pregnancy could be related to the effects on the kidney of several hormonal changes peculiar to pregnancy. In addition, the lowered PGE2/PGF2(α) ratio suggests the possibility of an increased activity of the PGE2-9-ketoreductase, which could be related to the changes in renal sodium handling observed in pregnancy. The pattern of PGE2 excretion in HP is opposite to that observed in HW (i.e. increase rather than decrease). However, both groups share the lowered PGE2/PGF2(α) ratio with respect to the normotensive counterparts. The causes of altered PG synthesis in pregnant women with hypertension are presently unclear.
|Number of pages||5|
|State||Published - 1982|