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OBJECTIVE: We evaluated associations between early-pregnancy oral glucose tolerance test (OGTT) glucose and complications in the Treatment of Booking Gestational Diabetes Mellitus (TOBOGM) cohort to inform prognostic OGTT thresholds. RESEARCH DESIGN AND METHODS: Individuals with risk factors for hyperglycemia were recruited for an international, multicenter, randomized controlled gestational diabetes mellitus (GDM) (World Health Organization 2013 criteria) treatment trial. A 2-h 75-g OGTT was performed at <20 weeks' gestation. Individuals with early treated hyperglycemia in pregnancy were excluded from the primary analysis. Early OGTT glucose concentrations were analyzed continuously and in glycemic categories (normal, low band, and high band). RESULTS: Overall, 3,645 individuals had an OGTT at (mean ± SD) 15.6 ± 2.5 weeks. For each 1-SD increase in fasting, 1-h, and 2-h glucose values, there were continuous positive associations with late GDM: adjusted odds ratio (aOR) 2.04 (95% CI 1.82-2.27), 3.05 (2.72-3.43), and 2.21 (1.99-2.45), respectively. There were continuous positive associations between 1-h and 2-h glucose and the perinatal composite (birth <37 + 0 weeks, birth trauma, birth weight ≥4,500 g, respiratory distress, phototherapy requirement, stillbirth/neonatal death, and shoulder dystocia), with aOR 1.15 (95% CI 1.04-1.26) and 1.14 (1.04-1.25), respectively, and with large-for-gestational-age offspring, with aOR 1.18 (1.06-1.31) and 1.26 (1.01-1.25), respectively. Significant associations were also observed between 1-h glucose and cesarean section and between fasting and 2-h glucose and neonatal hypoglycemia. In categorical analysis, only the high-band 1-h glucose (≥10.6 mmol/L [191 mg/dL]) predicted the perinatal composite. CONCLUSIONS: There is a continuous positive association between early-pregnancy OGTT glucose and complications. In individuals with hyperglycemia risk factors, only the high-glycemic-band 1-h glucose corresponded to increased ris, Funding: This study was supported by grantsfrom the National Health and Medical Research Council (grants 1104231 and 2009326), the Region Örebro Research Committee (grants Dnr OLL-970566 and OLL-942177), Medical Scientific Fund of the Mayor of Vienna (project 15205), the South Western Sydney Local Health District Academic Unit (grant 2016), and a Western Sydney University Ainsworth Trust Grant (2019)

OBJECTIVE: To identify factors associated with neonatal respiratory distress (NRD) in early Gestational diabetes mellitus (eGDM). DESIGN: Nested case-control analysis of the TOBOGM trial. SETTING: Seventeen hospitals: Australia, Sweden, Austria and India. POPULATION: Pregnant women, <20 weeks' gestation, singleton, GDM risk factors. METHODS: Women with GDM risk factors completed an oral glucose tolerance test (OGTT) before 20 weeks: those with eGDM (WHO-2013 criteria) were randomised to immediate or deferred GDM treatment. Logistic regression compared pregnancies with/without NRD, and in pregnancies with NRD, those with/without high-dependency nursery admission for ≤24 h with those admitted for >24 h. Comparisons were adjusted for age, pre-pregnancy body mass index, ethnicity, smoking, primigravity, education and site. Adjusted odds ratios (95% CI) are reported. MAIN OUTCOME MEASURES: NRD definition: ≥4 h of respiratory support (supplemental oxygen or supported ventilation) postpartum. Respiratory distress syndrome (RDS): Supported ventilation and ≥24 h nursery stay. RESULTS: Ninety-nine (12.5%) of 793 infants had NRD; incidence halved (0.50, 0.31-0.79) if GDM treatment was started early. NRD was associated with Caesarean section (2.31, 1.42-3.76), large for gestational age (LGA) (1.83, 1.09-3.08) and shorter gestation (0.95, 0.93-0.97 per day longer). Among NRD infants, >24 h nursery-stay was associated with higher OGTT 1-h glucose (1.38, 1.08-1.76 per mmol/L). Fifteen (2.0%) infants had RDS. CONCLUSIONS: Identifying and treating eGDM reduces NRD risk. NRD is more likely with Caesarean section, LGA and shorter gestation. Further studies are needed to understand the mechanisms behind this eGDM complication and any long-term effects., This study is supported by the National Health and Medical Research Council (NHMRC grants 1104231 and 2009326), the Region Örebro Research Committee (grants Dnr OLL-970566 and OLL-942177), Medical Scientific Fund of the Mayor of Vienna (project numbers 15205 and 23026), the South Western Sydney Local Health District Academic Unit (grant 2016) and a Western Sydney University Ainsworth Trust Grant (2019).

OBJECTIVE: In most gestational diabetes mellitus (GDM) studies, cohorts have included women combined into study populations without regard to whether hyperglycemia was present earlier in pregnancy. In this study we sought to compare perinatal outcomes between groups: women with early GDM (EGDM group: diagnosis before 20 weeks but no treatment until 24-28 weeks if GDM still present), with late GDM (LGDM group: present only at 24-28 weeks), and with normoglycemia at 24-28 weeks (control subjects). RESEARCH DESIGN AND METHODS: This is a secondary analysis of a randomized controlled treatment trial where we studied, among women with risk factors, early (<20 weeks' gestation) GDM defined according to World Health Organization 2013 criteria. Those receiving early treatment for GDM treatment were excluded. GDM was treated if present at 24-28 weeks. The primary outcome was a composite of birth before 37 weeks' gestation, birth weight ≥4,500 g, birth trauma, neonatal respiratory distress, phototherapy, stillbirth/neonatal death, and shoulder dystocia. Comparisons included adjustment for age, ethnicity, BMI, site, smoking, primigravity, and education. RESULTS: Women with EGDM (n = 254) and LGDM (n = 467) had shorter pregnancy duration than control subjects (n = 2,339). BMI was lowest with LGDM. The composite was increased with EGDM (odds ratio [OR] 1.59, 95% CI 1.18-2.12)) but not LGDM (OR 1.19, 95% CI 0.94-1.50). Induction of labor was higher in both GDM groups. In comparisons with control subjects there were higher birth centile, higher preterm birth rate, and higher rate of neonatal jaundice for the EGDM group (but not the LGDM group). The greatest need for insulin and/or metformin was with EGDM. CONCLUSIONS: Adverse perinatal outcomes were increased with EGDM despite treatment from 24-28 weeks' gestation, suggesting the need to initiate treatment early, and more aggressively, to reduce the effects of exposure to the more severe maternal hyperglycemia from early pregnan

OBJECTIVE: To compare pregnancy outcomes among women with a normal oral glucose tolerance test (OGTT) before 20 weeks' gestation (early) and at 24-28 weeks' gestation (late) (no gestational diabetes mellitus, or No-GDM), those with early GDM randomized to observation with a subsequent normal OGTT (GDM-Regression), and those with GDM on both occasions (GDM-Maintained). RESEARCH DESIGN AND METHODS: Women at <20 weeks' gestation with GDM risk factors who were recruited for a randomized controlled early GDM treatment trial were included. Women with treated early GDM and late GDM (according to the World Health Organization's 2013 criteria) were excluded from this analysis. Logistic regression compared pregnancy outcomes. RESULTS: GDM-Regression (n = 121) group risk factor profiles and OGTT results generally fell between the No-GDM (n = 2,218) and GDM-Maintained (n = 254) groups, with adjusted incidences of pregnancy complications similar between the GDM-Regression and No-GDM groups. CONCLUSIONS: Women with early GDM but normal OGTT at 24-28 weeks' gestation had pregnancy outcomes that were similar to those of individuals without GDM. Identifying early GDM likely to regress would allow treatment to be avoided., Funding:The National Health and Medical Research Council (NHMRC) (grants 1104231 and 2009326)The Region Örebro Research Committee (grants Dnr OLL-970566 and OLL-942177)The Medical Scientific Fund of the Mayor of Vienna (project numbers 15205 and 23026)The South Western Sydney Local Health District Academic Unit (grant 2016)Western Sydney University Ainsworth Trust grant (2019)

(Abstracted from N Engl J Med 2023;388(23):2132-2144) Gestational diabetes mellitus is a common pregnancy complication. It is associated with adverse outcomes, including preeclampsia, obstetrical intervention, large-for-gestational-age neonates, shoulder dystocia, birth trauma, and neonatal hypoglycemia. Cohort studies have found that women with hyperglycemia before 20 weeks of gestation are more likely to experience accelerated fetal growth by 24 to 28 weeks than those diagnosed with GDM later in pregnancy.

Einleitung: Bei Diagnose eines Gestationsdiabetes (GDM) vor der 20.Schwangerschaftswoche (SSW) wird leitliniengemäß eine Therapie begonnen. Für diese Praxis liegt keine Evidenz vor, die eine Verbesserung der Gesundheit von Mutter oder Nachkommen bei GDM-Behandlung in der frühen Schwangerschaft belegt. Methoden: Frauen mit einem Risikofaktor für GDM wurden zwischen 4.−20.SSW bei Vorliegen einer GDM Diagnose nach WHO 2013 Kriterien randomisiert einer Behandlungsgruppe oder einer Kontrollgruppe zugeordnet. Die Behandlungs-gruppe erhielt sofortige GDM Behandlung, während die Kontrollgruppe je nach Ergebnissen eines erneuten oralen Glukosetoleranztests (OGTT) in der 24.−28.SSW eine verschobene oder keine Behandlung erhielt. Die Studie hatte drei primäre Endpunkte: eine Kombination ungünstiger neonataler Ereignisse (Geburt <37.SSW, Geburtstrauma, Geburtsgewicht ≥4500 g, RDS, Phototherapie, Totgeburt/neonataler Tod oder Schulterdystokie), schwangerschaftsbedingte Hypertonieerkrankungen (Präeklampsie, Eklampsie, gestationsbedingter Bluthochdruck) und neonatale fettfreie Körpermasse. Ergebnisse: Insgesamt wurden 802 Frauen randomisiert (406 Sofortbehandlung, 396 Kontrollgruppe). Die Erstvisite fand durchschnittlich in der 15,6 ± 2,5 SSW statt. Der neonatale Kombinationsendpunkt trat bei 94/378 Frauen (24,9 %) bei sofortiger Behandlung und bei 113/370 Frauen (30,5 %) in der Kontrollgruppe auf (adj. Risikounterschied −5,6 %;95 % KI,–10,1;−1,2, RR 0,82;0,68-0,98). Schwangerschaftsbedingter Bluthochdruck trat bei 40/378 Frauen (10,6 %) bei sofortiger Behandlung und bei 37/372 Frauen (9,9 %) in der Kontrollgruppe auf (0,7 %,95 % KI,–1,6;2,9, RR 1.08;0.85–1.38). Die fettfreie Körpermasse der Neugeborenen betrug 2,86 kg bei sofortiger Behandlung und 2,91 kg in der Kontrollgruppe (−0,04 kg; 95 % KI,–0,09;0,02). Untergruppenanalysen zeigten eine stärkere Wirkung der Intervention auf neonatale Ergebnisse bei Frauen mit höheren Blutzuckerwerten und bei OGTT Durchführung vor der 14.S

BACKGROUND: Whether treatment of gestational diabetes before 20 weeks' gestation improves maternal and infant health is unclear. METHODS: We randomly assigned, in a 1:1 ratio, women between 4 weeks' and 19 weeks 6 days' gestation who had a risk factor for hyperglycemia and a diagnosis of gestational diabetes (World Health Organization 2013 criteria) to receive immediate treatment for gestational diabetes or deferred or no treatment, depending on the results of a repeat oral glucose-tolerance test [OGTT] at 24 to 28 weeks' gestation (control). The trial included three primary outcomes: a composite of adverse neonatal outcomes (birth at <37 weeks' gestation, birth trauma, birth weight of ≥4500 g, respiratory distress, phototherapy, stillbirth or neonatal death, or shoulder dystocia), pregnancy-related hypertension (preeclampsia, eclampsia, or gestational hypertension), and neonatal lean body mass. RESULTS: A total of 802 women underwent randomization; 406 were assigned to the immediate-treatment group and 396 to the control group; follow-up data were available for 793 women (98.9%). An initial OGTT was performed at a mean (±SD) gestation of 15.6±2.5 weeks. An adverse neonatal outcome event occurred in 94 of 378 women (24.9%) in the immediate-treatment group and in 113 of 370 women (30.5%) in the control group (adjusted risk difference, -5.6 percentage points; 95% confidence interval [CI], -10.1 to -1.2). Pregnancy-related hypertension occurred in 40 of 378 women (10.6%) in the immediate-treatment group and in 37 of 372 women (9.9%) in the control group (adjusted risk difference, 0.7 percentage points; 95% CI, -1.6 to 2.9). The mean neonatal lean body mass was 2.86 g in the immediate-treatment group and 2.91 g in the control group (adjusted mean difference, -0.04 g; 95% CI, -0.09 to 0.02). No between-group differences were observed with respect to serious adverse events associated with screening and treatment. CONCLUSIONS: Immediate treatment of gestational diabetes