Influence of Long-Term Beta-Mimetic Therapy on the Lecithin Content of Amniotic Fluid

Abstract
The lecithin content of 157 amniotic fluid samples taken from 60 patients who had been treated with Fenoterol over a long period of time (longer than 30 mg/daily per os for 14 days; intravenous infusion for longer than 7 days) was calculated thin-layer chromatographically according to Kynast and Saling. These lecithin levels were statistically compared with the levels in a control group (Wilcoxon test). It emerged that the lecithin levels in the long-term Β-mimetic therapy group were significantly lower, i.e., from 33/0 to 39/6 (33/0–34/6, p < 0.05; 35/0–39/6, p < 0.01). The answer to the question how often levels occur in the long-term group which are below the as critical described level of 3 mg Lec/100 ml amniotic fluid appears to be clinically important. It is shown that values below the critical level from 33/0 to 39/6 are much more frequent in the long-term /Β-mimetics therapy group than in the control group. There is no known explanation for this. It was concluded that the application of /Β-mimetics in cases of long-term tocolysis should only be discontinued when the lecithin content of the amniotic fluid lies above the critical limit of 3 mg Lec/100 ml.

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