Aims: A better understanding of the characteristics of obstetric patients admitted to an intensive care unit (ICU) could guide where the focus of obstetric training and awareness should be directed at to reduce further maternal mortality and morbidity. Methods: We retrospectively assessed the charts of all women admitted during pregnancy or postpartum to a tertiary ICU over a 12-year period. We retrieved whether women were followed locally or referred from another hospital and whether the ICU admission was prophylactic or therapeutic. Results: There were 190 admissions in 183 women. One-hundred and four admissions were in referred women and 86 in women cared for locally. Seventy-eight admissions (41.1%) were for direct obstetric causes (primarily postpartum hemorrhage (n = 14), hypertensive disorders of pregnancy (n = 12) and peripartum cardiomyopathy (n = 10)). Indirect obstetric admissions (n = 89; 46.8%) were primarily for cardiopathies (n = 35) and pulmonary diseases (n = 18). Among non-obstetric admissions, trauma (n = 6; 26.1%) and neurologic tumors (n = 6; 26.1%) were the most common. Conclusion: Pre-existing and acquired cardiopathies are the main reason for admission to an ICU in a developed country and have surpassed hypertensive disorders and hemorrhage. This should become a focus of obstetric care provider training.