AMNIOTIC-FLUID EPIDERMAL GROWTH-FACTOR CONCENTRATIONS - THE EFFECT OFINTRAAMNIOTIC THYROXINE FOR ACCELERATION OF FETAL MATURATION

Intra-amniotic thyroxine (200-500 ug) was administered weekly to 29 wo men in the third trimester to enhance fetal maturation. Lecithin-sphin gomyelin ratio (L/S) and epidermal growth factor (EGF) were measured i n amniotic fluid (AF) before (n = 58) and after (n = 92) administratio n of thyroxine. The AF L/S ratio and EGF concentration increased linea rly with increasing gestational age both before (r = 0.76, p < 0.0001; r = 0.41, p < 0.001, respectively) and after (r = 0.62, p < 0.0001; r = 0.43, p < 0.001 respectively) initiation of thyroxine treatment. Th e slopes of gestational age vs L/S (0.07) and EGF (0.004) before T4 in creased significantly after initiation of T4 therapy (L/S:0.23, p < 0. 001; EGF:0.015, p < 0.01, respectively). L/S ratios correlated with AF EGF levels before (r = 0.77, p < 0.001) and after (r = 0.63, p < 0.00 1) initiation of T4 therapy. These results demonstrate that intra-amni otic thyroxine accelerates not only the progression of the amniotic fl uid L/S ratio, but the appearance of EGF.