Risk of Subsequent Hypertension and Diabetes in Women With Hypertension During Pregnancy and Gestational Diabetes.

OBJECTIVE: To assess risks of postpartum hypertension and diabetes mellitus (DM) for women with hypertension during pregnancy (HDP) with and without gestational DM (GDM).

PATIENTS AND METHODS: From insurance data of 15- to 44-year-old women with pregnancy in 2000-2011, we established an HDP/GDM cohort (n=1270), an HDP/non-GDM cohort (n=5077), and a comparison cohort without either disorder (n=12,594), frequency matched by age and year of pregnancy. Postpartum hypertension and DM were assessed before 2012.

RESULTS: The postpartum hypertension incidence increased with age in all cohorts, with overall rates of 13.1, 8.82, and 0.79 per 1000 person-years in the HDP/GDM, HDP/non-GDM, and comparison cohorts, respectively. The adjusted hazard ratios (aHRs) of hypertension were 16.8 (95% CI, 11.8-24.1) for the HDP/GDM cohort and 11.2 (95% CI, 8.19-15.2) for the HDP/non-GDM cohort relative to the comparison cohort. The corresponding incident DM rates were 41.9 and 8.06 vs 2.55 per 1000 person-years in the 3 cohorts, respectively, with aHRs of 16.2 (95% CI, 13.2-19.9) for the HDP/GDM cohort and 3.15 (95% CI, 2.55-3.89) for the HDP/non-GDM cohort relative to the comparison cohort. Incident DM in the HDP/GDM cohort was 44% greater in 15- to 29-year-old women vs 40- to 44-year-old women (49.1 vs 34.2 per 1000 person-years), with aHRs of 39.2 (95% CI, 24.5-62.7) and 5.52 (95% CI, 2.92-10.4), respectively, relative to comparisons of respective age groups.

CONCLUSION: Subsequent hypertension and DM risks are greater in women with HDP/GDM than in women with HDP only compared with women without these complications. Younger women with HDP/GDM should be particularly cautious.