Daily Ards Research Analysis
Analyzed 1 papers and selected 1 impactful papers.
Summary
A large multicenter, propensity score–matched ICU cohort study found that obesity (BMI 30–44.9 kg/m^2) is associated with higher early and late mortality, greater need for hemodialysis, and increased VV-ECMO use. Notably, there were no significant differences in cardiac arrest or ARDS occurrence, challenging the 'obesity paradox' in modern critical care.
Research Themes
- Obesity and critical care outcomes
- Renal replacement therapy risk in ICU
- ECMO utilization patterns and timing
Selected Articles
1. Temporal Trends in ICU Outcomes by BMI: A Retrospective Propensity-Score Matched Study.
In a propensity score–matched analysis of 29,617 ICU patients, obesity (BMI 30–44.9 kg/m^2) was associated with higher all-cause mortality in both early and late ICU periods. Obesity also increased early and late initiation of hemodialysis and was linked to higher VV-ECMO use, while no significant differences were seen in cardiac arrest or ARDS occurrence.
Impact: This large, multicenter analysis challenges the obesity paradox in modern ICU care, showing consistent mortality and renal replacement risks associated with obesity. The time-stratified results inform resource planning (e.g., VV-ECMO) and risk stratification.
Clinical Implications: ICU teams should not assume protective effects of obesity; instead, they should anticipate higher mortality and renal replacement needs in obese patients. Early renal-protective strategies, vigilant fluid/AKI management, and proactive VV-ECMO readiness may be warranted.
Key Findings
- Higher early ICU mortality in obese patients: HR 1.213 (95% CI 1.16–1.267).
- Higher late ICU mortality in obese patients: HR 1.213 (95% CI 1.16–1.267).
- Increased hemodialysis initiation early (HR 1.49, 95% CI 1.387–1.6) and late (HR 1.537, 95% CI 1.352–1.747).
- VV-ECMO use increased early (HR 1.4, 95% CI 1.022–1.916) and late (HR 2.206, 95% CI 1.14–4.161).
- No significant differences in cardiac arrest, ARDS, or ECMO overall.
Methodological Strengths
- Large multicenter cohort with 29,617 propensity-matched patients.
- Propensity score matching on demographic and clinical variables.
- Time-stratified assessment (early vs late ICU weeks) of outcomes.
Limitations
- Retrospective design with potential residual confounding despite matching.
- BMI assessed as admission category, without dynamic changes or body composition measures.
- Limited detail on ventilatory/renal support protocols may affect comparability across centers.
Future Directions: Prospective studies to validate these associations, integrate body composition metrics, and test targeted renal-protective and ECMO triage strategies in obese ICU patients.
IMPORTANCE: Obesity has been associated with adverse outcomes in critical illness, including increased mortality, organ dysfunction, and prolonged ventilation. The "obesity paradox," suggesting improved survival in obese patients, remains controversial in ICU populations. The independent role of body mass index (BMI) on outcomes with modern organ support remains uncertain. OBJECTIVE: To evaluate whether a BMI of 30-44.9 kg/m DESIGN: Retrospective multicenter cohort study using a real-world data platform. Patients were stratified by BMI and matched using propensity scores for demographic and clinical factors. EXPOSURE: BMI category at ICU admission (30-44.9 vs 18.5-29,9kg/m MAIN OUTCOMES AND MEASURES: Outcomes were assessed during early and late weeks of ICU stay. Primary outcomes were all-cause mortality; secondary outcomes included cardiac arrest, hemodialysis initiation, ARDS, and use of ECMO. RESULTS: Among 29,617 matched patients, obesity was associated with higher early (HR 1.213 [95% CI 1.16-1.267]) and late (HR 1.213 [95% CI 1.16-1.267]) mortality. Hemodialysis use was more frequent early (HR 1.49 [95% CI 1.387-1.6]) and late (HR 1.537 [95% CI 1.352-1.747]). VV-ECMO was also higher early (HR 1.4 [95% CI 1.022-1.916]) and late (HR 2.206 [95% CI 1.14-4.161]). No significant differences were observed in cardiac arrest, ARDS, or ECMO. CONCLUSIONS AND RELEVANCE: Obesity independently increased ICU mortality and need for renal hemodialysis, underscoring the need for targeted preventive and management strategies in this high-risk population.