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Childbearing beyond maternal age 50 is associated with significantly increased risks for the fetus, suggest results of a study published on Friday in the journal Obstetrics and Gynecology.
Women in the 50+ age range who are thinking of becoming pregnant should receive "special counselling both before and after conception so that they become informed of the increased risks involved," Dr Hamisu M. Salihu and colleagues from the University of Alabama at Birmingham write.
There is a lack of reliable information on pregnant women in their fifties, Salihu told. He and his colleagues reviewed all 12,066,854 deliveries in the US between 1997 and 1999, categorising mothers as young (age 20-29), mature (age 30-39), very mature (age 40 to 49), and older (age 50 or more). There were 539 deliveries in the older group.
In this, the "first population-based nation-wide study, we found that fetal growth, fetal maturity and survival were significantly compromised among 50-year old mothers in comparison to their younger counterparts, including women in their forties," Salihu said. Older mothers were two to three times more likely to have infants that were growth-impaired, immature or stillborn.
"We were surprised with our findings," Salihu commented. "We had thought that 50-year-old moms would have the same level of risk as women in their forties."
"Pregnancy beyond age 50 may represent a distinct obstetric entity with a risk pattern that differs from that observed for mature and very mature mothers," the team writes.
While the researchers did not specifically address the use of assisted reproduction technologies in the study, most of the pregnancies in the 50+ group were artificially induced.
"Because of the risks, assisted reproduction technology clients need to be adequately informed of the possible implications of achieving pregnancy beyond age 50, so that they are well-equipped to make an informed decision," Salihu advised.
"Our study also highlights the need for a broad-based national policy discourse to generate guidelines that will eventually govern the use of assisted reproduction technologies among women in their fifties," he added.
Online

Copyright Associated Press of Pakistan, 2006

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