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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Risk of minor and major fetal malformations in diabetics with high haemoglobin A1c values in early pregnancy.
British Medical Journal (1981-1988) 1984 August 12
Maternal haemoglobin A1c (HbA1c) values were measured before the end of the 15th week of gestation in 142 pregnancies in women with insulin dependent diabetes. In pregnancies complicated by fetal malformations (n = 17) the mean initial HbA1c value was 9.5 (SD 1.8)% of the total haemoglobin concentration, which was significantly (p less than 0.001) higher than in pregnancies without malformations (8.0 (SD 1.4)%; n = 125). HbA1c values did not differ between pregnancies complicated by minor and major fetal malformations, but the rate of malformations showed a positive relation to the HbA1c value in early pregnancy (chi 2 = 11.9; p = 0.001). Fetal malformations occurred in six out of 17 pregnancies (35.3%) in mothers whose initial HbA1c value was 10% or more, in eight out of 62 pregnancies (12.9%) in mothers with initial values between 8.0% and 9.9%, and in only three out of 63 pregnancies (4.8%) in mothers with an initial value below 8.0%. These data support the hypothesis that the increased incidence of fetal malformations in mothers with insulin dependent diabetes is associated with maternal hyperglycaemia during organogenesis. Hence diabetic women who are planning to have a child--especially those with a high HbA1c value--should receive intensified metabolic control.
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