ObjectiveTo investigate whether exposure to hyperemesis gravidarum (HG) is associated with increased maternal long‐term mortality.DesignPopulation‐based cohort study.SettingMedical Birth Registry of Norway (1967–2002) linked to the Cause of Death Registry.PopulationWomen in Norway with singleton births in the period 1967–2002, with and without HG. Women were followed until 2009 or death.MethodsCox proportional hazard regression model was applied to estimate hazard ratios (HRs) with 95% confidence interval (CI).Main outcome measuresThe primary outcome was all‐cause mortality during follow up. Secondary outcomes were cause‐specific mortality (cardiovascular mortality, deaths due to cancer, external causes or mental and behavioural disorders).ResultsOf 999 161 women with singleton births, 13 397 (1.3%) experienced HG. During a median follow up of 26 years (25 902 036 person‐years), 43 470 women died (4.4%). Women exposed to HG had a lower risk of long‐term all‐cause mortality compared with women without HG (crude HR 0.82; 95% CI 0.75–0.90). When adjusting for confounders, this reduction was no longer significant (adjusted HR 0.92; 95% CI 0.84–1.01). Women exposed to HG had a similar risk of cardiovascular death as women not exposed (adjusted HR 1.04; 95% CI 0.83–1.29), but a lower long‐term risk of death from cancer (adjusted HR 0.86; 95% CI 0.75–0.98).ConclusionIn this large population‐based cohort study, HG was not associated with an increased risk of long‐term all‐cause mortality. Women exposed to HG had no increase in mortality due to cardiovascular disease, but had a reduced risk of death from cancer.Tweetable abstractPopulation‐based cohort study: Hyperemesis was not associated with an increased risk of long‐term mortality.

Women with hypertensive disorders in pregnancy seemed to have an unfavorable cardiovascular risk profile in midlife compared to women with uncomplicated pregnancies. In contrast there was no consistent evidence of increased risk subsequent to hyperemesis gravidarum. The proportion of daily smokers was lower in women with either of the two pregnancy complications.

Objective To investigate whether exposure to hyperemesis gravidarum (hyperemesis) is associated with subsequent maternal cardiovascular morbidity. Design Nationwide cohort study. Setting Medical Birth Registry of Norway (1967–2002) linked to the nationwide Cardiovascular Disease in Norway project 1994–2009 (CVDNOR) and the Cause of Death Registry. Population Women in Norway with singleton births from 1967 to 2002, with and without hyperemesis, were followed up with respect to cardiovascular outcomes from 1994 to 2009. Methods Cox proportional hazards regression model was applied to estimate hazard ratios (HRs) with 95% confidence interval (CI). Main outcome measures The first hospitalisation due to nonfatal stroke, myocardial infarction or angina pectoris, or cardiovascular death. Results Among 989 473 women with singleton births, 13 212 (1.3%) suffered from hyperemesis. During follow-up, a total of 43 482 (4.4%) women experienced a cardiovascular event. No association was found between hyperemesis and the risk of a fatal or nonfatal cardiovascular event (adjusted HR 1.08; 95% CI 0.99–1.18). Women with hyperemesis had higher risk of hospitalisation due to angina pectoris (adjusted HR 1.28; 95% CI 1.15–1.44). The risk of cardiovascular death was lower among hyperemetic women in age-adjusted analysis (HR 0.73; 95% CI 0.59–0.91), but the association was no longer significant when adjusting for possible confounders. Conclusion Women with a history of hyperemesis did not have increased risk of a cardiovascular event (nonfatal myocardial infarction or stroke, angina pectoris or cardiovascular death) compared to women without.