28 Association of serum sodium concentration, fluid balance and weight loss with bronchopulmonary dysplasia in very preterm infants
Bibliographic record
Abstract
Abstract Background Bronchopulmonary dysplasia (BPD) affects 20% of very preterm infants born <33 weeks gestational age (GA). In this subgroup of neonates, postnatal fluid adaptation may be inefficient due to kidney immaturity, resulting in increased pulmonary interstitial fluid content, lung damage and impaired air-gas exchange. Early postnatal fluid status might contribute to the risk of developing BPD and requires further investigation. Objectives To investigate the association of three indicators of early postnatal fluid status (median serum sodium concentration, cumulative fluid balance and maximum percentage weight loss) measured over the first 10 days after delivery with death and/or BPD in infants born <33 weeks. Design/Methods This retrospective cohort study included infants born 23-32 weeks GA, admitted to the Montreal Children’s Hospital’s NICU from 2015-2018. Neonates moribund on admission, with any major congenital malformation and/or admitted to the NICU >1 day after birth were excluded. Data was collected from the Canadian Neonatal Network database and individual chart review. BPD was defined as oxygen therapy or respiratory support at 36 weeks’ corrected GA. Unadjusted comparisons were made using the Wilcoxon test. Associations between exposures (median serum sodium concentration, cumulative fluid balance and maximum percentage weight loss in the first 10 days after delivery) and outcomes (death and/or BPD) were assessed using multivariable logistic regression analyses adjusting for sex, steroid use, GA, small-for-gestational-age status, Apgar at 5 min<7, surfactant use and mode of delivery. Results Among 439 eligible infants, 125 died and/or developed BPD (29%). Median serum sodium concentration was 139 mmol/L (IQR 136-141) among BPD-free survivors and 136 mmol/L (IQR 134-139) among infants with death and/or BPD (p<0.001). Cumulative fluid balance was 4.09 dL/kg (IQR 2.98-4.78) among BPD-free survivors and 4.88 dL/kg (IQR 3.96-5.95) among infants with death and/or BPD (p<0.001). Maximum percentage weight loss was 8.5% (IQR 5.4-11.6) among BPD-free survivors and 9.2% (IQR 4.9-12.9) among infants with death and/or BPD (p=0.41). Adjusted odds ratios (95% confidence interval) are presented in Table 1. Conclusion Among very preterm infants, higher cumulative fluid balance in the first 10 days after delivery is associated with higher odds of death and/or BPD. Thus, targeting lower cumulative fluid balance may improve BPD-free survival.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".