Neutrophilic myeloperoxidase index and mean light absorbance in neonatal septic and nonseptic foals.

The study aims to explore the use of indices, neutrophilic myeloperoxidase index (MPXI) and mean light absorbance (neutrophil X mean [NXM]), as markers for neutrophil activation, which indicates systemic inflammatory diseases in horses and people. The research specifically focuses on their use in differentiating among healthy, nonseptic sick, and septic sick foals.

Research Objectives

• The study seeks to assess whether conditions likely to activate neutrophils trigger reductions in MPXI and NXM, using data collected from neutropenic and non-neutropenic foals with and without septicemia.

Research Methodology

• The researchers employed a retrospective study design,
  utilizing previously collected complete blood count (CBC) data from 61 neonatal foals brought to the Equine Teaching Hospital of Barcelona.
• The data was assessed for potential correlations between the indices MPXI and NXM, and the percentage of large unstained cells, neutrophil counts, and percentage of band neutrophils.
• The obtained results from septic (32 subjects), nonseptic sick (22 subjects), and healthy foals (7 subjects) were contrasted. Additional comparisons were drawn among a broader set of categories, including septic/neutropenic (12 subjects), septic/non-neutropenic (20 subjects), nonseptic/neutropenic (8 subjects), nonseptic/non-neutropenic (14 subjects), and healthy foals (7 subjects).

Research Findings

• The analysis discovered a minimal negative correlation between MPXI and neutrophil count, as well as NXM and percentage of band neutrophil.
• Septic/neutropenic foals exhibited significantly elevated MPXI values, compared to both septic/non-neutropenic and nonseptic/neutropenic/non-neutropenic groups.
• There was no significant difference in the MPXI values between septic/neutropenic foals and healthy controls.
• While there were no notable differences in NXM or MPXI across all disease groups in comparison with healthy controls, septic/neutropenic foals showed significantly higher median MPXI in contrast with other groups of sick foals.

Conclusions and Future Research

• The findings inherently suggest that septic/neutropenic foals exhibit uniquely high MPXI values, despite the overall lack of significant variation in NXM and MPXI across different groups when compared to healthy control.
• Additional prospective studies are recommended to further determine whether this observed MPXI elevation in septic/neutropenic foals is tied to reduced neutrophil function or activation.