Dramatic physiologic changes are part of normal human pregnancy. The p
hysiologic alterations of pregnancy have the potential to affect chron
ic diseases, to unmask subclinical conditions, or to alter the present
ation and course of newly acquired illnesses. An update in selected to
pics of obstetric medicine follows, focusing on clinical entities in w
hich there have been significant advances in diagnosis or management.
Additionally, reviews of selected medical disorders, such as I-W infec
tion and asthma, that are rising in incidence in women of reproductive
age are included.