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Medical technologies may hinder rather than help newborn survival

This release is also available in German.

Medical interventions during pregnancy and childbirth may not be the best way to improve newborn survival in middle-income countries, suggests a study published online today by THE LANCET.

In Brazil neonatal mortality declined in the 1980's but rates have virtually remained unchanged since the 1990's. Fernando Barros (Hospital de Clinicas, Montevideo, Uruguay) and colleagues studied births in 1992, 1993, and 2004 in the Brazilian city of Pelotas. They found that important changes in maternal characteristics occurred over the 22 years covered by the study. Mothers were on average 4.5cm taller, 5.1kg heavier, smoked less and were more educated than those who gave birth in 1982. The women's mean number of antenatal visits increased as did the proportion whose initial visit was in their first trimester. 97% of all women had at least one ultrasound scan and 31% had three or more scans during pregnancy. Other antenatal procedures were less frequent: 23% (543 of 2373) of women had no vaginal examination and 68% (1189 of 1748) of women, not previously immunised against tetanus, reported receiving one or more doses of this vaccine. The percentage of induced deliveries increased from 2.5% (147 of 5914) in 1982 to 43% (1026 of 2386) in 2004. Rates of caesarean section increased greatly from 28% (1632 of 5914) in 1982 to 43% (1039 of 2403) in 2004, reaching 82% (374 of 456) of all private deliveries in 2004.

The mean birthweight of babies decreased and the proportion of children lighter than 2500g rose, primarily due to an increase in pre-term births. The prevalence of pre-term births increased from 8.5% (437 of 5139) of babies in 1993 to 13.5% (316 of 2340) in 2004. The authors suggest that the increase in preterm birth rates might have resulted from either acceleration of delivery thorough induction or caesarean section of foetuses
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Contact: Joe Santangelo
j.santangelo@elsevier.com
1-212-633-3810
Lancet
3-Mar-2005


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