Update on new developments in the study of human teratogens

Area of Science:

• Teratology
• Reproductive Toxicology
• Maternal-Fetal Medicine

Background:

• Identifying teratogenic agents is crucial for maternal and infant health.
• Annual reviews synthesize new information on pregnancy-related risks.

Purpose of the Study:

• To review new and significant information on agents potentially teratogenic in pregnant women.
• To provide an overview of current knowledge on drug and environmental exposures during pregnancy.

Main Methods:

• Comprehensive review of online and printed information sources.
• Analysis of epidemiological data and case studies.
• Synthesis of findings on specific agents and outcomes.

Main Results:

• Lithium medication shows a decreased risk estimate.
• Cigarette smoking and specific genotypes are linked to oral-facial clefts and clubfoot.
• Other discussed agents include trimethoprim, methimazole, glucocorticoids, binge drinking, valproate, and carbamazepine.

Conclusions:

• Maternal exposures such as smoking and medications (lithium, trimethoprim, methimazole, corticosteroids) are associated with small increases in birth defect rates.
• Weak teratogenic effects are often identified through associations between uncommon treatments and unusual birth defects.
• Prospective multicenter studies and modern epidemiologic techniques strengthen evidence for teratogenicity, aiding risk communication to healthcare providers and patients.