Lymphocyte-to-white blood cells ratio in older patients experiencing a first acute heart failure hospitalization

Low lymphocyte counts are related to poor health results in heart failure (HF) patients. We assess whether a low lymphocyte-to-white blood cells ratio (LWR) is related to 1-year mortality in older patients experiencing a first hospitalization for acute HF.

We evaluated 859 patients > 75 years of age admitted within a 33-month period because of a first episode of acute HF. Patients were divided into four groups according to LWR quartiles.

Patients' mean age was 83.5 ± 5.5 years and their median LWR was 16.7%. After 1 year of follow-up 270 patients (31.43%) died. Mean LWR values were significatively lower in the group of patients who died (15.1 vs. 17.4%; p = 0.001). Mortality rates were significantly higher in the lower LWR quartile either at 1 month, 3 months, and 1 year after the index acute HF episode. The univariate logistic regression analysis identified the LWR (either as quartiles or continuous variable) to be independently associated with higher risk of 1-year post-discharge mortality. Multivariate analysis confirmed this association (HR for LWR as a quartiles variable 1.525; 95% CI 1.161-2.003 and for LWR as a continuous variable 1.145; 95% CI 1.069-1854) besides older age, a higher comorbidity and higher admission potassium.

As is the case in other HF scenarios, a simple routine admission laboratory test such as lymphocyte count can independently predict 1-year mortality for older patients hospitalized for first time due to acute HF.