Hypertension in pregnancy can be broadly classified as chronic hypertension, pregnancy-induced hypertension (or gestational hypertension), and pre-eclampsia / eclampsia.  All of these conditions are the source of significant maternal morbidity and mortality.
Cardiac disease in pregnancy and hypertension
Cardiac disease in pregnancy and arrhythmias
Cardiac disease in pregnancy and pulmonary hypertension
Cardiac disease in pregnancy and valvular heart disease
Cardiac disease in pregnancy and acute myocardial infarction
Cardiac disease in pregnancy and congenital heart disease
Cardiac disease in pregnancy and peripartum cardiomyopathy
Cardiac disease in pregnancy and connective tissue disorders