Adherence to medical treatment in relation to pregnancy, birth outcome & breastfeeding behavior among women with Crohn's disease.

BACKGROUND

Crohn's disease (CD) is common among women of fertile age, and it often requires maintenance medical treatment. Adherence to medical treatment among women with CD prior to, during, and after pregnancy has, however, never been examined. Although CD women have increased risk of adverse pregnancy outcomes, little is known about predictors for these outcomes in women with CD. In addition, the impact of breastfeeding on disease activity remains controversial.

AIMS

The aims of this PhD thesis were to determine adherence to treatment and to investigate predictors for and prevalence rates of non-adherence to maintenance medical treatment among women with CD prior to, during, and after pregnancy; to assess pregnancy outcomes among women with CD, taking medical treatment, smoking status, and disease activity into account; to assess breastfeeding rates and the impact of breastfeeding on the risk of relapse.

METHODS

We conducted a population-based prevalence study including 154 women with CD who had given birth within a six-year period. We combined questionnaire data, data from medical records, and medical register data.

RESULTS

Among 105 (80%) respondents, more than half reported taking medication with an overall high adherence rate of 69.8%. Counselling, previous pregnancy, and planned pregnancy seemed to decrease the likelihood of non-adherence, whereas smoking seemed to predict non-adherence prior to pregnancy, although our sample size prevented any firm conclusions. During pregnancy, the vast majority (95%) of CD women were in remission. The children's birth weight did not differ in relation to maternal medical treatment, but mean birth weight in children of smokers in medical treatment was 274 g lower than that of children of non-smokers in medical treatment. In our relatively small study CD women in medical treatment were not at increased risk of adverse pregnancy outcomes compared with untreated women with CD. In total, 87.6% of CD women were breastfeeding, and rates did not vary by medical treatment. Smoking and non-adherence seemed to predict relapse in CD during the postpartum period, whereas breastfeeding seemed protective against relapse.

CONCLUSIONS

Although we generally had low statistical precision this thesis suggests that counselling regarding medical treatment may be an important factor for medical adherence among CD women of fertile age. In addition CD women in medical treatment did not seem at increased risk of adverse pregnancy outcome, but smoking predicted lower birth weight. Breastfeeding did not seem to increase the risk of relapse in CD.