These 20 pregnancies occurred in i8 patients who
between them experienced a total of 25 attacks.
Twenty attacks occurred during pregnancy and 5 in
the puerperium. Sixteen of the i8 patients had pure
mitral stenosis. In 2, the dominant lesion was aortic
regurgitation, but there were important associated
disorders in both cases: hypertensive toxaemia
and hemichorea, respectively