Data Collection
Baseline clinical data for cases and controls were obtained through
electronic chart review. For all women, the following data were
recorded: maternal age, parity, pre-pregnancy height and weight,
baseline pre-pregnancy or early pregnancy vital signs (blood pressure,
heart rate), anatomic details of cardiovascular disease (study group),
cardiac surgical/interventional history, baseline New York Heart
Association functional class and medication history. When available,
obstetric and labour/delivery information was also collected.