一个主动脉瓣狭窄母亲坚持想要孩子, 然而几乎所有医生都建议她要堕胎然后接受主动脉瓣替换手术. 关于保大保小的老问题:The ethical principles pertaining to pregnancy are straightforward. The doctor's first responsibility is to the mother, and while a baby may be sacrificed _in utero_ to sustain the mother's health, it's not acceptable to put a mother at risk for the sake of an unborn child. A baby will normally survive if delivered after thirty weeks, even twenty-eight weeks. But only rarely have dying mothers been kept alive with the sole objective of sustaining a fetus.