Children with prenatal alcohol exposure showed significant nailfold microvascular abnormalities compared to unexposed peers, supporting nailfold capillaroscopy as 'a potential early biomarker of cardiometabolic risk' in this population.
Children with prenatal alcohol exposure (PAE) had significantly lower capillary density compared to unexposed controls after adjusting for age and sex.
Children with PAE had greater average inter-capillary distance compared to unexposed controls.
Children with PAE had greater average capillary width compared to unexposed controls.
Children with PAE had a significantly higher percentage of enlarged capillaries compared to unexposed controls.
Child age was negatively associated with capillary density independent of PAE status.
This study represents the first characterization of nailfold microvascular morphology in children and adolescents with prenatal alcohol exposure.
This research suggests that children who were exposed to alcohol before birth show measurable differences in tiny blood vessels visible at the base of their fingernails compared to children who were not exposed. Using a non-invasive technique called nailfold capillaroscopy — essentially a high-resolution video microscope aimed at the skin near the fingernail — researchers found that children with prenatal alcohol exposure had fewer capillaries per area, larger spaces between those capillaries, wider individual capillaries, and a higher proportion of abnormally enlarged capillaries. These differences were seen even after accounting for the children's age and sex. These types of microvascular changes — abnormalities in the smallest blood vessels — are known in other conditions to appear before more serious heart or metabolic diseases become clinically apparent. This research suggests that prenatal alcohol exposure may affect the development of the microvascular system in ways that could put children at greater long-term cardiometabolic risk. The authors note this is the first study to characterize these capillary features specifically in children with prenatal alcohol exposure. The study was small, with 27 children in the exposed group and 10 in the comparison group, and used a cross-sectional (single point in time) design, so it cannot establish cause and effect or predict individual health outcomes. However, the findings support nailfold capillaroscopy as a potentially useful, non-invasive tool for identifying early signs of cardiovascular or metabolic risk in children with prenatal alcohol exposure, and point to the need for larger follow-up studies.
Anunziata F, Kable J, Castañeda M, Koslosky M, Pickering B, Beach D, et al.. (2026). Nailfold Capillary Morphology as a Potential Biomarker of Cardiovascular or Metabolic Risk in Children Aged 3-17 Years Prenatally Exposed to Alcohol.. Alcohol, clinical & experimental research. https://doi.org/10.1111/acer.70408