Utility of reticulocyte hemoglobin as a new predictor of anemia in intensive care unit patients

TL;DR

This study shows that reticulocyte hemoglobin measures can better predict anemia in ICU patients compared to traditional markers like ferritin.

Contribution

The study introduces reticulocyte hemoglobin equivalent (RET-He) and Delta-He as novel, more reliable predictors of anemia in ICU patients.

Findings

RET-He and Delta-He remained stable initially but decreased over time, correlating with anemia risk.

Ferritin levels failed to predict anemia in ICU patients, unlike RET-He and Delta-He.

RET-He and Delta-He outperformed ferritin in predicting hemoglobin levels and anemia.

Abstract

Iron deficiency and anemia are common complications in critically ill patients, particularly in the Intensive Care Unit setting (ICU), where inflammation and infection are prevalent. Traditional markers like ferritin are unreliable in these contexts due to their behavior as acute-phase reactants. New hematimetric indices, such as Reticulocyte Hemoglobin Equivalent (RET-He) and Delta Hemoglobin Equivalent (Delta-He), may offer better predictive value for anemia in ICU patients.

This study aimed to evaluate the predictive utility of RET-He and Delta-He for anemia in critically ill patients and compare their performance with serum ferritin levels.

A pilot, observational, prospective study was conducted on 40 ICU patients admitted for burns or polytrauma. Hematological and hematimetric parameters were analyzed at admission, 48 h, 4 days, and 7 days post-admission. Mixed-effects regression models were used to assess the predictive value of RET-He, Delta-He, and ferritin for hemoglobin levels and anemia.

Significant reductions in hemoglobin and hematocrit were observed within the first 48 h of ICU admission, while RET-He and Delta-He remained stable. Over 4 and 7 days, decreases in RET-He and Delta-He were strongly associated with lower hemoglobin levels and increased risk of anemia (p < 0.01). Ferritin levels did not predict anemia in either period.

RET-He and Delta-He are valuable predictors of anemia in critically ill ICU patients, outperforming ferritin in this context. Their routine use could improve the early detection and management of iron deficiency and anemia in ICU settings.