Consensus statement on diabetes control in preparation for pregnancy

To the Editor: The “Consensus statement on diabetes control in preparation for pregnancy”1 presents a counsel of perfection that is, regrettably, a cry in the wilderness in this most imperfect of all imperfect worlds. None will deny that the glycaemic target specified would represent a wonderful achievement in a woman attending in early pregnancy. Unfortunately, we are far from achieving this goal, for a variety of reasons.

Firstly, and most importantly, “preparation for pregnancy” is unusual. At our clinic (King Edward Memorial Hospital, Perth), where we see up to 90 women each year whose diabetes (types 1 and 2) antedated pregnancy, fewer than 15% have been seen for preconceptional counselling, and a similar proportion have an HbA1c level below 7%. Moreover, at the same hospital, the rate of unplanned pregnancy in the general antenatal clinic exceeds 50%. Studies elsewhere have shown that the rate of unplanned pregnancy in women with diabetes is the same or greater,2 and this figure accords with our own observations. Finally, in many women of reproductive age with diabetes, glycaemic targets as recommended by the Diabetes Control and Complications Trial Research Group3 and the recent consensus statement1 are infrequently met. One study of young adults in a type 1 diabetes clinic4 revealed that “. . . only 3.4% . . . achieved an average HbA1c of less than 7% during 11 years of study . . . despite regular specialist physician, specialist diabetes nurse and dietitian input and repeatedly following up failed appointments”. Australian findings are probably not substantially better in this group.

Unfortunately, levels espoused by the above authorities are difficult to attain outside the sequestered environment of a clinical trial. Thus, the realisation of the St Vincent declaration,5 which sought to normalise obstetric outcome for women with diabetes, has proven elusive. Statements that recommend ideal levels of glycaemic control before pregnancy, while laudable, are unlikely to improve the high rates of miscarriage, congenital abnormality, preterm birth and perinatal mortality that we observe.

What, then, can we do? The most important intervention in the care of fertile women with diabetes is effective contraception, with the aim of preventing pregnancy until adequate control of diabetes has been achieved. Numerous studies have shown that women who plan their pregnancy and attend for preconceptional care demonstrate better periconceptional glycaemic control and, accordingly, lower rates of adverse events in pregnancy.6 Only by raising the matter of family planning repeatedly with all our younger female patients can we hope to avoid the disappointing observation of an unplanned pregnancy, with all its adverse consequences for the woman with diabetes and her baby.