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Trisomy 18 cases showed reduced maternal estrogen and fetal adrenal hypoplasia. These findings may explain complications like prolonged pregnancies and the need for obstetric intervention in infants with trisomy 18.
Area of Science:
- Genetics
- Perinatology
- Endocrinology
Background:
- Trisomy 18 (Edwards syndrome) is a severe genetic disorder associated with significant prenatal and neonatal complications.
- Fetoplacental function and fetal adrenal development are critical for successful pregnancy outcomes.
Observation:
- Three cases of trisomy 18 were analyzed, focusing on fetoplacental function and fetal adrenal development.
- Reduced 24-hour maternal urinary estrogen levels were observed in all three cases, indicating diminished fetoplacental function.
Findings:
- All infants diagnosed with trisomy 18 exhibited hypoplasia of the fetal adrenal cortical zone, both grossly and microscopically.
- This adrenal abnormality correlates with the observed diminished fetoplacental function.
Implications:
- The findings suggest a link between fetal adrenal hypoplasia, impaired fetoplacental function, and adverse outcomes in trisomy 18.
- Understanding these mechanisms may inform obstetric management and improve prognostication for trisomy 18 pregnancies.
Abstract:
Three cases of trisomy 18 are described, each with evidence of diminished fetoplacental function, specifically reduced 24-hour maternal urinary estrogen. All three infants died within three months and showed gross and microscopic evidence of hypoplasia of the fetal adrenal cortical zone. This abnormality is consistent with and helps explain the increased incidence of obstetric intervention and prolonged pregnancy in this syndrome.