Hypertrophic Cardiomyopathy Risk Factors in Infants of diabetic mothers

Abstract Background Diabetes mellitus (DM) is a systemic chronic metabolic disorder characterized by increased insulin resistance and/or β- cell defects. Maternal DM significantly affects the fetal heart and fetal–placental circulation in both structure and function. Cardiac defects, myocardial hypertrophy are three times more prevalent in infants of diabetic mothers (IDMs). Objective Assess the frequency of hypertrophic cardiomyopathy (HCM) among infants of diabetic mothers and its relationship to the maternal glycemic control and the birth weight for the gestational age. Patients and Methods This was a cross-sectional study conducted on (50) neonates with gestational age ≥ 35 weeks born to diabetic mothers recruited from the delivery room and Neonatal Observation Unit, Obstetrics and Gynecology Hospital, Ain shams university. Detailed history was taken for the duration of maternal diabetes, glycemic control and any associated complications and the level of hemoglobin A1C (HbA1C) was assessed for all the enrolled mothers. Neonates were subjected to full clinical examination and echocardiographic evaluation in the first week of life. Results Forty % of mothers had gestational diabetes mellitus (GDM), (20%) were pre-gestational diabetes type 1 and 40% were pre-GDM type 2. There were 18 infants (36%) had HCM. HCM was highly statistically significant (p-value 0.001) more in cases with high maternal HbA1C (8.3 ± 0.9). The frequency of HCM among infants of pre-GDM mothers (15 patients, 50%) was significantly higher (p-value = 0.012) when compared to infants of GDM mothers (3 patients, 15%). But the frequency of HCM was equal in infants of pre-GDM type I mothers and those of pre-GDM type 2 mothers. HCM was more common with large for gestational age (LGA) infants (10 cases 55.6% of infants with HCM were LGA). Conclusion HCM is more frequent among infants of mothers with pre-GDM type 1 than infants of GDM. Poor maternal glycemic control and large for gestational age are associated with higher frequency of HCM among those infants.