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Ultrasound in Obstetrics & Gynecology

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Vol 43 (12 Issues in 2014)
Print ISSN: 0960-7692 Online ISSN: 1469-0705
Impact Factor: 3.557

April 06, 2011

Progesterone reduces rate of early preterm birth in at risk women

NIH study finds progesterone benefits women with short cervix 

A new study published online in the journal Ultrasound in Obstetrics and Gynecology has found that progesterone, a naturally occurring hormone, reduced the rate of preterm birth before the 33rd week of pregnancy by 45 percent among one category of at risk women.

The women in the study had a short cervix, which is known to increase the risk for preterm birth. The cervix is the part of the uterus that opens and shortens during labor.

The study also found that infants born to women who had received progesterone were less likely to develop respiratory distress syndrome, a breathing complication occurring in preterm infants.

The study was undertaken by physicians of the Perinatology Research Branch at NIH’s Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) along with 44 medical centers around the world (including Asia, Africa, Europe, North and South America). The study was a collaboration between the NIH and Columbia Laboratories, Inc., in Livingston, N.J.

“Our study demonstrates that progesterone gel reduces the rate of early preterm delivery—less than 33 weeks— in women with a short cervix,” said Roberto Romero, M.D., program head for Perinatology Research and Obstetrics and chief of the Perinatology Research Branch. “Women with a short cervix can be identified through routine ultrasound screening. Once identified, they could be offered treatment with progesterone.”

Dr. Romero explained that progesterone is a naturally occurring hormone which is essential to maintain pregnancy and that a short cervix is thought to be a sign of a possible shortage of progesterone.

The study authors reasoned that by giving progesterone to women with a short cervix, they could, in many cases, prolong pregnancy.

A total of 458 women with a short cervix (10-20 millimeters) were randomly assigned to receive either a vaginal gel progesterone preparation or a placebo between the 19th and 23rd week of pregnancy.

Progesterone treatment was associated with a lower rate of preterm delivery at less than 33 weeks (8.9 percent in the progesterone group versus 16.1 percent in the placebo group). Differences in the rate of preterm birth were also seen in births before 28 and 35 weeks of pregnancy.

Infants born to women who received progesterone had a lower rate of respiratory distress syndrome than those in the placebo group (3 percent versus 7.6 percent).

 

Full citation: Hassan SS et al Vaginal progesterone reduces the rate of preterm birth in women with a sonographic short cervix: a multicenter, randomized, double-blind, placebo-controlled trial. Ultrasound in Obstetrics and Gynecology; Published Online: April 6, 2011. URL upon publication: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1469-0705/accepted