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Losartan and fetal toxic effects.
Lancet (London, England)
|February 24, 2001
Summary
Maternal losartan exposure during pregnancy caused severe fetal toxicity, including oligohydramnios and hypoplastic development, leading to fetal death. These effects mirror those of angiotensin-converting-enzyme (ACE) inhibitors.
Area of Science:
- Pharmacology
- Teratology
- Obstetrics
Background:
- Antihypertensive medications are frequently prescribed during pregnancy.
- The safety profile of specific antihypertensive agents, such as losartan, requires ongoing evaluation.
- Understanding drug effects on fetal development is crucial for prenatal care.
Observation:
- A case of maternal losartan exposure between 20-31 weeks of gestation is presented.
- The fetus exhibited significant toxic effects, including oligohydramnios (reduced amniotic fluid).
- Further abnormalities included pulmonary hypoplasia and hypoplastic skull bones, culminating in fetal demise.
Findings:
- Maternal losartan exposure during the second and third trimesters was associated with severe fetal toxicity.
- The observed pattern of congenital abnormalities is consistent with known teratogenic effects of angiotensin-converting-enzyme (ACE) inhibitors.
- Losartan, an angiotensin II receptor blocker (ARB), likely mediated these adverse fetal outcomes.
Implications:
- This case highlights potential risks associated with losartan use in pregnant patients.
- Clinicians should exercise caution when prescribing ARBs during pregnancy.
- Further research is warranted to elucidate the teratogenic potential of ARBs and inform clinical guidelines.
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