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  • What is Optimal...

What is Optimal pre-pregnancy BMI cut-off point for pregnant women with maternal cardiometabolic conditions?

Written By : Dr Nirali Kapoor |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 8 Oct 2024 3:30 PM  |  Updated On 9 Oct 2024 7:28 AM
What is Optimal pre-pregnancy BMI cut-off point for pregnant women with maternal cardiometabolic conditions?
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The escalating prevalence of obesity is acknowledged as a worldwide public health concern that impacts individuals of all ages and genders. Particularly among women of childbearing age, the increasing incidence of obesity in Brazil has significant implications for maternal health during pregnancy.

The body mass index (BMI) is a widely utilized measure for assessing the nutritional status of populations, determined by measuring an individual’s weight and height. The World Health Organization (WHO) has proposed BMI thresholds of 30.0 kg/m2 to classify individuals as obese and 25.0 kg/m2 for categorizing adults as overweight.

Similarly, the Institute of Medicine (IOM) guidelines categorize body weight based on BMI values, classifying women as overweight (25.0-29.9 kg/m2 ) or obese (30.0 kg/ m2 ), regardless of age, parity, smoking history, or ethnic background. These BMI categories have been utilized to establish recommended guidelines for gestational weight gain. However, it remains uncertain whether these recommendations from the WHO and IOM adequately reflect the risk of adverse maternal and perinatal outcomes among pregnant women. Moreover, a rise in the BMI of pregnant women is linked to an elevated risk during pregnancy, including cesarean sections (both elective and emergency), gestational diabetes, postpartum hemorrhage, preeclampsia, preterm rupture of membranes, and other associated issues.

Additionally, infants born to mothers with higher BMI values face an increased likelihood of scoring below 7 on the 5-minute APGAR scale. Therefore, using traditional adult BMI to predict adverse maternal or fetal outcomes among pregnant women has shown inaccuracies. Consequently, this study aimed at suggesting new BMI cut-off points based on cardiometabolic conditions in pregnancy using a low-risk outpatient sample. The objective is to identify pregnant women at risk early on, allowing them to receive adequate prenatal care, ultimately leading to improved maternal and perinatal outcomes.

In this prospective study, singleton pregnant women from the fetal medicine service of the Brazilian Unified Health System were included. The pregnancy, perinatal, and newborn data were obtained from the clinical medical records. Maternal anthropometry included an assessment of weight and height and the prepregnancy BMI evaluation categorized according to the World Health Organization cut-off points. The area under the curve and confidence interval values from receiver operator curves were generated to identify the optimal cut-off points using prepregnancy BMI with better sensitivity and specificity.

Data on 218 pregnancies were analyzed, with 57.9% (n = 124) being classified as overweight/obese, 11% (n = 24) with GDM, 6.9% (n = 15) with preeclampsia, and 11.0% (n = 24) with gestational hypertension. The BMI cut-off points for predicting cardiometabolic conditions were 27.52 kg/m2 (S: 66.7%; E: 63.8%) for women with GDM; 27.40 kg/m2 (S: 73.3%; E: 62.4%; S: 79.2%; E: 64.9%; S: 70.3%; E: 66.3%) for women with preeclampsia, gestational hypertension, and gestational hypertension plus preeclampsia, respectively; and 27.96 kg/m2 (S: 69.6%; E: 65.6%) for women with preeclampsia plus GDM.

The main finding was that the best prepregnancy BMI threshold associated with cardiometabolic conditions during pregnancy was around 27 kg/m2 . Sensitivity, considered the most significant parameter in diagnostic evaluation, achieved an approximate rate of 80% for gestational hypertension and 73% for preeclampsia outcomes. Furthermore, the ROC curve performance achieved a high AUC for gestational hypertension using a prepregnancy BMI threshold of 27.4 kg/m2 .

In summary, the present study suggests that the use of adult BMI thresholds among pregnant women may not be universally applicable to all scenarios. Instead, adopting 27 kg/m2 as a cut-off point threshold appears to be more effective in predicting adverse pregnancy-related outcomes, achieving a better balance between sensitivity and specificity. This allows for early identification of pregnant women at risk for common metabolic outcomes of pregnancy with superior accuracy. Ultimately, early implementation of rigorous clinical and nutritional care will lead to better maternal and perinatal outcomes.

Source: Renata O. Neves , 1 Alexandre da S. Rocha , 2 Bruna O. de Vargas; Hindawi Journal of Pregnancy Volume 2023, Article ID 6669700, 7 pages https://doi.org/10.1155/2023/6669700

Pre-pregnancy BMIpregnant women healthcardiometabolic condition
Source : Hindawi Journal of Pregnancy
Dr Nirali Kapoor
Dr Nirali Kapoor

    MBBS, MD Obstetrics and Gynecology

    Dr Nirali Kapoor has completed her MBBS from GMC Jamnagar and MD Obstetrics and Gynecology from AIIMS Rishikesh. She underwent training in trauma/emergency medicine non academic residency in AIIMS Delhi for an year after her MBBS. Post her MD, she has joined in a Multispeciality hospital in Amritsar. She is actively involved in cases concerning fetal medicine, infertility and minimal invasive procedures as well as research activities involved around the fields of interest.

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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