Objective: Despite modern methods of treatment and near-normal HbA(1c) levels, women with type 1 diabetes mellitus are still at risk of having an infant with a congenital malformation (CM). We hypothesised that HbA(1c) levels are too gross a measure of glycaemic control and used a continuous glucose monitoring system (CGMS) to determine the diurnal glucose profiles during the first trimester of pregnancy. We present three cases of infants with a CM.
Methods: Fifty-three women with type 1 diabetes used the CGMS for 48 h in the first trimester of pregnancy. Three of them gave birth to infants with a CM. HbA(1c) levels were determined at the time of the CGMS measurement and 6 to 8 weeks later.
Results: The HbA(1c) levels at the time of the CGMS measurement were 6.0, 6.5 and 7.8% (normal range 4.0-6.0%) in the three women. The 48-h diurnal glucose profiles of these women showed a large variability with frequent hyperglycaemic episodes.
Conclusions: HbA(1c) levels are too gross a measure of glycaemic control to identify women at risk of giving birth to an infant with a CM. Even in women with normal or near-normal HbA(1c) levels, the diurnal glucose profiles reveal intermittent hyperglycaemic episodes that may cause the CM.
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