Background: Severe inflammation causes poor outcomes in coronary care unit (CCU) patients. The neutrophil-lymphocyte ratio (NLR), a biomarker used to monitor inflammation and the immune response, can predict a poor prognosis in various diseases. However, it remains unclear whether the NLR is associated with all-cause mortality in CCU patients. This study investigated the association between the NLR and CCU outcomes.
Methods: Clinical data were extracted from the Multiparameter Intelligent Monitoring in Intensive Care III (MIMIC-III) database, which contains health data for over 50,000 patients. The primary outcome was 30-day mortality and the secondary outcome was 90-day mortality. Cox proportional hazard models were used to reveal the associations between NLR and outcomes. Multivariate analyses were used to control for confounders.
Results: We enrolled 3563 CCU patients. For 30-day mortality, the hazard ratio (HR) (95% confidence interval [CI]) for the second (NLR 4.80-10.08) and the third (NLR ≥ 10.09) tertiles were 1.57 (1.24, 1.97) and 2.76 (2.23, 3.41), respectively, compared to the first tertile (NLR < 4.80). In the model adjusted for multiple confounders, the fifth quintile (NLR ≥ 14.17) showed a slightly lower mortality risk [HR (95% CI) 1.44 (1.07, 1.94)] compared to the fourth (NLR 8.82-14.16) [HR (95% CI) 1.55 (1.15, 2.10)]. A similar trend was observed for 90-day mortality. The interactions between the acute kidney injury, respiratory failure, and pneumonia subgroups and 30-day mortality were significant.
Conclusions: The NLR was an independent predictor of 30- and 90-day mortality for CCU patients. The NLR is a promising clinical biomarker as an integrated, readily available predictor of CCU mortality.
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