From the Journals

Gestational weight outside guidelines adversely affects mothers, babies

Publish date: September 26, 2018
By
Heidi Splete

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Don’t underestimate the importance of patient counseling

“We are struggling with an obesity epidemic in this country, and pregnancy accounts for a risk time for women to gain excessive weight,” Martina L. Badell, MD, said in an interview. “This is a very well-designed large study which attempted to systematically evaluate the adverse perinatal outcomes associated with inappropriate weight gain in pregnancy across a diverse group of women.”

Dr. Martina L. Badell is an assistant professor of gynecology and obstetrics in the division of maternal-fetal medicine at Emory University in Atlanta.

Dr. Martina L. Badell

Dr. Badell said she was not surprised by the results because they support findings from previous studies and reflect “what we as clinicians taking care of patients see on a regular basis.”

She emphasized that “the take home message is the importance of counseling regarding weight gain in pregnancy and monitoring it closely in real time as the associated risks are significant and potentially avoidable. The first step to solving a problem is adequately quantifying it, and this study does just that. The next step is giving this information to pregnant women along with making weight gain a part of the discussion prior to pregnancy and at every prenatal visit.”

Dr. Badell added, “Ideally, the weight gain for an individual pregnant women would be tracked and discussed with her during each prenatal visit. If she is below or above the recommendations, the risks associated with this could be discussed along with strategies to get/stay on track. In an ideal world, women struggling with weight gain goals in pregnancy would have access to a dietitian. However, in reality, ob.gyn. offices will likely need to come up with patient education handouts or staff education.”

Another useful avenue for research would be assessing the effects of patient education, Dr. Badell said. “The next best step would be implementing a study to assess if education of women during pregnancy about their individual weight gain at each visit and discussion regarding perinatal risks affects ultimate weight gain and reduces risks. Additionally, education could begin in the preconception phase as this knowledge is likely important even prior to pregnancy. Finally, studies are needed on interventions such as working with dietitians or patient education classes once a woman has been identified as not being within weight gain goals to evaluate if these can alter weight gain and improve outcomes.”

Dr. Badell is a maternal-fetal medicine specialist in the department of gynecology and obstetrics at Emory University, Atlanta. She was asked to comment on the findings of Kominiarek MA et al. Dr. Badell had no relevant financial conflicts to disclose.


 

FROM OBSTETRICS & GYNECOLOGY

Gestational weight gain above or below the level recommended by the Institute of Medicine (IOM) guidelines resulted in significantly worse outcomes for mothers and babies, according to data from nearly 30,000 women.

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Previous studies of the relationship between gestational weight gain and maternal and neonatal outcomes have been limited by “small sample sizes, single sites, restricted reporting of outcomes, and a lack of racial-ethnic diversity,” Michelle A. Kominiarek, MD, of Northwestern University in Chicago and her colleagues wrote . To determine the effects of gestational weight gain on a large and more diverse population, the researchers conducted a secondary analysis of the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) Maternal-Fetal Medicine Units Network’s Assessment of Perinatal Excellence study. The findings were published in Obstetrics & Gynecology.

Gestational weight gain above the amount recommended by IOM guidelines was significantly associated with adverse outcomes in neonates, including macrosomia (adjusted odds ratio, 2.66), shoulder dystocia (aOR, 1.74), and neonatal hypoglycemia (aOR, 1.60).

In further multivariate analysis, adverse maternal outcomes associated with gestational weight gain above that recommended by the guidelines included hypertensive diseases of pregnancy for any parity (aOR, 1.84) and increased risk of cesarean delivery in nulliparous and multiparous women (aORs, 1.44 and 1.26, respectively).

Gestational weight gain below the recommended amount was associated with both spontaneous (aOR, 1.50) and indicated (aOR, 1.34) preterm birth. Weight gain above the guidelines was associated with a greater risk of indicated preterm birth only (aOR, 1.24).

The study population included 29,861 women at 25 hospitals over a 3-year period. Of these, 51% had gestational weight gains above the amount recommended by the IOM guidelines and 21% had gestational weight gains below it. The researchers calculated gestational weight gain by subtracting prepregnancy weight from delivery weight or, if prepregnancy weight was not available, by subtracting weight at the first prenatal visit at 13 weeks of gestation or earlier from delivery weight.

The study findings were limited by the use of self-reported prepregnancy weight and the possible effects of changes to the guidelines with respect to obese patients, the researchers said. However, the results support those from previous studies, and the “noted strengths include analysis of 29,861 women representative of the United States with rigorous ascertainment of outcomes and calculation of gestational weight gain to account for the wide range of gestational ages at delivery,” Dr. Kominiarek and her associates wrote.

Overall, the data support efforts to educate women on health behaviors and how gestational weight gain affects them and their infants, and additional research is needed to help women meet their goals for appropriate gestational weight, the researchers concluded.

SOURCE: Kominiarek MA et al. Obstet Gynecol. 2018 Oct;132(4):875-81.

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