MRI Findings in Third-Trimester Opioid-Exposed Fetuses, With Focus on Brain Measurements: A Prospective Multicenter...

Area of Science:

• Neurology
• Obstetrics
• Pediatrics

Background:

• The opioid epidemic significantly impacts infants, with in utero opioid exposure increasing risks for cognitive and behavioral issues.
• Limited research exists on prenatal brain development in opioid-exposed fetuses.
• This study addresses the gap in understanding the effects of prenatal opioid exposure on fetal brain development.

Purpose of the Study:

• To compare fetal brain 2D biometric measurements between opioid-exposed and unexposed fetuses using MRI.
• To evaluate additional pregnancy-related assessments in opioid-exposed versus unexposed fetuses.
• To investigate the impact of prenatal opioid exposure on fetal brain development.

Main Methods:

• A prospective case-control study involving third-trimester fetal MRI.
• Comparison of 14 2D brain biometric measurements and four derived indexes between opioid-exposed (n=28) and unexposed (n=37) fetuses.
• Multivariable linear regression adjusted for gestational age, fetal sex, and nicotine exposure.

Main Results:

• Opioid-exposed fetuses showed significantly smaller measurements in seven brain areas, including cerebral frontooccipital diameter and corpus callosum length.
• A larger frontooccipital index was observed in opioid-exposed fetuses.
• Opioid-exposed fetuses had higher frequencies of breech position and increased amniotic fluid volume.

Conclusions:

• Fetuses exposed to opioids in utero exhibit smaller brain size compared to unexposed fetuses.
• Prenatal opioid exposure is associated with altered fetal physiology, including position and amniotic fluid volume.
• Findings provide crucial insights into the neurological impact of prenatal opioid exposure.