Key result
Lowest hemoglobin glycation index linked to ~46% higher 30-day mortality in critically ill AF.
Why the study?
Does a low hemoglobin glycation index increase all-cause mortality in critically ill adult patients with atrial fibrillation?
Cohort (n=10,159)
No
Does a low hemoglobin glycation index increase all-cause mortality in critically ill adult patients with atrial fibrillation?
Hazard Ratio: 1.46 (95% CI 1.13–1.89)
Absolute Event Rate: 10.63% vs 7.27%
p-value: p=0.004
In critically ill patients with atrial fibrillation, a low hemoglobin glycation index is associated with significantly higher short- and long-term all-cause mortality, a relationship partially mediated by red blood cell distribution width.
Low HGI may identify higher-risk critically ill AF patients; extends observational data but should not yet change practice.
BACKGROUND: Effective risk stratification tools are scarce for intensive care unit patients with atrial fibrillation (AF). Although the hemoglobin glycation index (HGI) predicts poor outcomes in various conditions, its clinical utility for critically ill AF populations is undetermined. METHODS: Data from 10,159 ICU patients with AF were extracted from the MIMIC-IV database. The HGI was calculated as the residual difference between observed and predicted glycated hemoglobin based on fasting glucose levels. Associations with 30-, 90-, and 365-day mortality were assessed using Cox proportional hazards models and restricted cubic splines. Causal mediation analysis was performed to explore underlying pathways. RESULTS: The lowest HGI quartile (Q1) had significantly higher mortality risks versus Q2 (reference) across 30-day (HR = 1.46), 90-day (HR = 1.42), and 365-day (HR = 1.26) follow-ups. A non-linear, inverse association was confirmed, with risk concentrated at low HGI levels. This association was stronger in patients with elevated BMI (p-interaction < 0.01). Causal mediation analysis revealed that red blood cell distribution width (RDW) significantly mediated the risk of low HGI, explaining 3%-8% of the total effect. CONCLUSIONS: The study demonstrates a non-linear inverse association between HGI and mortality in critically ill AF patients, a relationship partially mediated by RDW and particularly strong in patients with elevated BMI. The findings highlight that the increased risk is primarily concentrated among patients with the lowest HGI values.
No takes yet. Share an insight, caveat, or question.
Long et al. (2026) conducted a cohort in Atrial fibrillation in critically ill patients (n=10,159). Lowest hemoglobin glycation index quartile (Q1, ≤ -0.608) vs. Second hemoglobin glycation index quartile (Q2, reference group) was evaluated on 30-day all-cause mortality (HR 1.46, 95% CI 1.13-1.89, p=0.004). Critically ill patients with atrial fibrillation in the lowest hemoglobin glycation index quartile had a 46% increased risk of 30-day mortality (HR 1.46) compared to those in the second quartile.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: