Among environmental exposures, which is the most commonly associated with patent ductus arteriosus?

Among environmental exposures, which is the most commonly associated with patent ductus arteriosus?

• A. Nicotine
• B. Alcohol
• C. Caffeine
• D. Amphetamines

Answer: (D)

Patency of the ductus arteriosus after birth hinges on oxygen levels and prostaglandin signaling. When the fetus is exposed to factors that reduce placental blood flow and cause fetal hypoxia, the signals that keep the ductus arteriosus open are reinforced. Amphetamines cause marked maternal vasoconstriction and placental insufficiency, leading to fetal hypoxia and a higher likelihood that the ductus arteriosus remains open after birth. Among the options, this exposure has the strongest association with a patent ductus arteriosus. Nicotine exposure also raises risk through placental perfusion effects, but amphetamines show the stronger link in the literature. Alcohol and caffeine are less clearly connected to PDA.

Patency of the ductus arteriosus after birth hinges on oxygen levels and prostaglandin signaling. When the fetus is exposed to factors that reduce placental blood flow and cause fetal hypoxia, the signals that keep the ductus arteriosus open are reinforced. Amphetamines cause marked maternal vasoconstriction and placental insufficiency, leading to fetal hypoxia and a higher likelihood that the ductus arteriosus remains open after birth. Among the options, this exposure has the strongest association with a patent ductus arteriosus. Nicotine exposure also raises risk through placental perfusion effects, but amphetamines show the stronger link in the literature. Alcohol and caffeine are less clearly connected to PDA.