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Maternal hemoglobin A1c and left ventricular hypertrophy in infants of mothers with pre-gestational diabetes.

OBJECTIVE: Maternal hemoglobin A1c (HbA1c) has been suggested to be a predictor of left ventricular hypertrophy (LVH) in the offspring of mothers with pre-gestational diabetes mellitus, although there is little data supporting this contention. We aimed to assess the relationship between maternal HbA1c and postnatal LVH.

METHODS: We performed a retrospective cohort study of infants born to mothers with pre-gestational diabetes mellitus from 2015 to 2021 at our institution. The primary predictor was maternal HbA1c; neonatal left ventricular mass (LVM) z-score was the primary outcome; LVM z-score was considered as both a continuous variable and a binary variable by dichotomizing at 4 to define LVH. Additionally, we used linear regression to determine the relationship between maternal HbA1c and LVM z-score.

RESULTS: There were 116 infants who met inclusion (50% female). Mean maternal HbA1c was generally higher in infants with LVH compared to those without LVH (8.2% with LVH vs. 7.2% without LVH [ p  = 0.009] in the second trimester, and 7.8% vs. 7.0% [ p  = 0.025] in the third trimester; no significant difference for first trimester). A greater percentage of infants with LVH were intubated (36% vs. 6%, p  < 0.001) and had longer average days of hospitalization (9 vs. 5, p  = 0.044). Second and third trimester HbA1c was weakly associated with LVM z-score (R2 = 0.063, p  < 0.001 and R2 = 0.068, p  < 0.001, respectively); first trimester HbA1c was not significantly predictive of LVM z-score.

CONCLUSION: Second and third trimester HbA1c is modestly predictive of LVH in infants born to mothers with pre-gestational diabetes mellitus.

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