Cardiovascular teratogenicity of ephedrine in chick embryos

Area of Science:

• Developmental toxicology
• Cardiovascular embryology
• Teratology

Background:

• Ephedrine is a sympathomimetic amine with known stimulant effects.
• Understanding the developmental toxicity of commonly used substances is crucial for public health.
• Chick embryos offer a valuable model for studying early cardiovascular development and teratogenesis.

Purpose of the Study:

• To investigate the cardiovascular teratogenicity and embryotoxicity of ephedrine.
• To determine the critical developmental window for ephedrine-induced heart malformations.
• To establish the dose-response relationship for ephedrine's teratogenic effects.

Main Methods:

• Chick embryos were exposed to ephedrine at developmental stages 17-28 (2.5-6 days of incubation).
• Embryos were examined on day 14 of incubation for cardiovascular malformations.
• A range of ephedrine doses, down to 1 mumol/egg, were tested.

Main Results:

• Cardiovascular malformations were observed in 29% of ephedrine-treated embryos.
• Complex heart anomalies, including double-outlet right ventricle (DORV), truncus arteriosus communis (TAC), and overriding aorta with ventricular septal defect (VSD), were frequently noted.
• Malformations were induced by ephedrine at doses as low as 1 mumol/egg, indicating high sensitivity.

Conclusions:

• Ephedrine is a potent cardiovascular teratogen in chick embryos.
• Early embryonic exposure to ephedrine during critical heart development stages leads to significant malformations.
• The findings suggest a potential risk of congenital heart defects associated with ephedrine exposure during pregnancy.