In Vitro Venous Catheter Material Comparison: Microbial Adhesion in a Thrombotic Blood Flow Model.
Kristen LeRoy, Daniel Donahue
PMID 41192349WHAT IT FOUND
In lab blood-flow tests, hydrophilic biomaterial catheters showed more than 96.3% less clot and more than 99.99% less microbial adhesion than thermoplastic polyurethane catheters.
Key findings
01In the blood-flow model, hydrophilic biomaterial catheters showed average thrombus reductions greater than 96.3% versus thermoplastic polyurethane catheters for all microbes tested.
02Hydrophilic biomaterial catheters averaged more than a 4-log reduction, or greater than 99.99% reduction, in microbial adhesion compared with thermoplastic polyurethane catheters for all 7 microbes tested.
03No microbial growth was observed on hydrophilic biomaterial catheters in 29 of 48 samples, or 60% of the samples studied, while all thermoplastic polyurethane catheter samples contained live microbes.
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
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What it does not show
The study tested catheter surfaces in a laboratory blood-flow model, not in patients, so it does not show whether catheter-related bloodstream infections or occlusions change in clinical care. Bovine blood and polymer surfaces activate platelets and clotting proteins more than they do in a patient's blood vessel. Two authors are employees of the company that makes the hydrophilic biomaterial catheters tested. The study compared materials under controlled conditions; it did not test insertion technique, patient factors, care practices, or long-term device safety.
Declared interests
Two authors, Kristen LeRoy and Daniel Donahue, are full-time paid employees of Access Vascular, Inc., the manufacturer of the HydroMID and HydroPICC catheters. The assays were conducted by an independent laboratory, Thrombodyne MDEC, LLC.
The easy way to misread this
Do not conclude that hydrophilic biomaterial catheters reduce bloodstream infections or catheter occlusions in patients. The study measured clot and microbial adhesion on catheter surfaces in a lab blood-flow model, not clinical outcomes.