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Related Experiment Video

Updated: Sep 9, 2025

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

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Inflammatory pathways in transfusion-associated circulatory overload.

RoseAnn E Vik¹, Esther B Bulle^2,3, Wilmore C Webley¹

¹Department of Microbiology, University of Massachusetts Amherst, Amherst, MA.

Blood Vessels, Thrombosis & Hemostasis

|September 2, 2025

Summary

This summary is machine-generated.

Transfusion-associated circulatory overload (TACO) may involve inflammation, not just fluid overload. Elevated IL-6 and IL-8 cytokines were found in TACO patients, suggesting inflammatory pathways contribute to this transfusion complication.

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Area of Science:

Transfusion Medicine
Immunology
Critical Care Medicine

Background:

Transfusion-associated circulatory overload (TACO) is a major cause of transfusion-related mortality.
Historically attributed to hydrostatic forces, recent evidence suggests inflammatory processes may also play a role.
Understanding TACO's pathophysiology is crucial for improving patient outcomes.

Purpose of the Study:

To investigate the presence and extent of inflammation in patients experiencing TACO.
To differentiate inflammatory profiles between conventional TACO (cTACO) and institutional TACO (iTACO) cases.
To explore potential overlaps between TACO and transfusion-related acute lung injury (TRALI).

Main Methods:

Retrospective study of three red blood cell transfusion cohorts: cTACO (n=33), iTACO (n=33), and uncomplicated transfusions (n=6).
Analysis of serum inflammatory markers (cytokines, adhesion molecules, biomarkers) pre- and post-transfusion.
Clinical data including vital signs and temperature were collected and compared across groups.

Main Results:

Patients with cTACO and iTACO exhibited post-transfusion fever, tachycardia, and decreased oxygen saturation.
Elevated levels of proinflammatory cytokines IL-6 and IL-8 were observed in both cTACO and iTACO groups.
Intercellular adhesion molecule 1 (ICAM-1) was elevated post-transfusion specifically in the iTACO group.

Conclusions:

Inflammatory pathways appear to be involved in the development of TACO.
The distinct inflammatory profile in iTACO patients suggests a potential overlap or intermediate state between TACO and TRALI.
Further research is warranted to elucidate the role of inflammation in TACO pathogenesis.