a1 Departments of Medicine, Vancouver, BC, Canada
a2 Obstetrics and Gynaecology, Vancouver, BC, Canada
a3 Health Care and Epidemiology, Vancouver, BC, Canada
a4 Child and Family Research Institute of British Columbia, University of British Columbia, Vancouver, BC, Canada
a5 British Columbia's Women's Hospital and Health Centre, Vancouver, BC, Canada
a6 Department of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
a7 Department of Nephrology, University of Sherbrooke, Sherbrooke, Quebec, Canada.
Cardiovascular disease is the leading cause of death in women. The hypertensive disorders of pregnancy (HDP) are the most common medical complication of pregnancy, complicating up to 10% of pregnancies worldwide. They represent a leading cause of maternal mortality and morbidity in pregnancy. The most common of these disorders is gestational hypertension (5–6%). Using population-based data, approximately 1% of pregnancies are complicated by pre-existing hypertension, 5–6% by gestational hypertension without proteinuria, and 1–2% by pre-eclampsia.