ABSTRACT
Profound changes take place in the maternal cardiovascular system during pregnancy, beginning after conception and continuing as gestation advances. Most changes are reversible within weeks to months after delivery. Maternal tolerance to twin pregnancies, however, is different from that of singleton pregnancies. The earlier onset of asthenia, the subjective difficulty in leading a normal, active life and the need for more rest all point to what extent the maternal cardiovascular system must adapt in multiple compared with singleton pregnancies. This chapter reviews the available data on why and to what extent the maternal cardiovascular system adapts to twin pregnancy.
