OASIS risk up for nulliparous women with vacuum delivery

OASIS risk up for nulliparous women with vacuum delivery
For women whose infants are delivered by vacuum extraction, the risk of obstetric anal sphincter injury is significantly higher among nulliparous women than multiparous women, according to a study published online Aug. 13 in BJOG: An International Journal of Obstetrics and Gynaecology.

(HealthDay)—For women whose infants are delivered by vacuum extraction, the risk of obstetric anal sphincter injury (OASIS) is significantly higher among nulliparous women than multiparous women, according to a study published online Aug. 13 in BJOG: An International Journal of Obstetrics and Gynaecology.

Sari Räisänen, Ph.D., from the Savonia University of Applied Sciences in Iisalmi, Finland, and colleagues investigated the risks of OASIS in a sample of 16,802 nulliparous and multiparous women delivered by vacuum extraction, using a population-based register from Finland, where episiotomy is exclusively lateral. Nulliparous and multiparous women with OASIS were compared with women without OASIS using stepwise .

The researchers found the incidence of OASIS to be significantly higher among (3.4 percent) than multiparous women (1.4 percent), with an adjusted odds ratio of 2.44. In nulliparous women, lateral episiotomy correlated with a significantly decreased incidence of OASIS (adjusted odds ratio, 0.54), but there was no significant association for multiparous women. There was an increase in the OASIS incidence (2.10-fold for nulliparae and 2.83-fold for multiparae) for a 1,000 g increase in birth weight.

"The results of the present study on women delivered by vacuum extraction provide evidence that OASIS risk incrementally decreases with each ," the authors write. "Lateral episiotomy was associated with an approximately 50 percent decreased incidence of OASIS in nulliparous women, including women admitted for a first vaginal delivery after a previous for their first birth."

More information: Abstract
Full Text (subscription or payment may be required)

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

Eating disorders linked to adverse perinatal outcomes

Oct 22, 2014

(HealthDay)—Maternal eating disorders are associated with adverse pregnancy, obstetric, and perinatal health outcomes, according to a study published in the October issue of the American Journal of Obstetrics & ...

Large variation in cesarean rates across US hospitals

Oct 21, 2014

Cesarean delivery is the most common inpatient surgery in the United States. US cesarean rates increased from 20.7% in 1996 to 32.9% in 2009 but have since stabilized, with 1.3 million American women having had a cesarean ...

User comments