The Study
Vitamin K antagonism aggravates chronic kidney disease-induced neointimal hyperplasia and calcification in arterialized veins: role of vitamin K treatment?
This study looked at rats and a few human vein pieces to see what happens when you block vitamin K. It found that blocking vitamin K made blood vessels get thicker and calcify more, and adding vitamin K2 helped a little — but only in healthy rats. We can't say it will work the same way in people.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
When blood vessels get turned into artificial access points for dialysis, they often get clogged or calcified. Some medicines used to prevent blood clots make this worse. This study found that giving a specific vitamin (K2) helps unclog the calcified parts but doesn't fix the tissue overgrowth.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 546 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — reducing calcification could help dialysis patients avoid fistula failure and need for repeat surgeries, even if it doesn't stop tissue overgrowth.
- 2Vitamin K2 reduced calcification in rats with and without kidney disease.
- 3It did not reduce tissue overgrowth in rats with kidney disease.
- 4Human vein samples showed inactive vitamin K-dependent proteins at calcified spots.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Kidney international
Year
2016
Authors
Emma Zaragatski, J. Grommes, L. Schurgers, S. Langer, L. Kennes, M. Tamm, T. Koeppel, Jennifer Kranz, T. Hackhofer, K. Arakelyan, M. Jacobs, M. Kokozidou
Related Content
Claims (6)
Taking vitamin K2 supplements is associated with a lower rate of calcium buildup in the arteries.
In human arterialized veins with vascular calcification and neointimal hyperplasia, Matrix Gla protein is found in an inactive form, which reflects a local deficiency of vitamin K in the vessel wall.
Inhibition of vitamin K activity is linked to excessive tissue growth and calcium buildup in blood vessels of rats with kidney disease and in humans undergoing dialysis, resulting from reduced activation of matrix Gla protein.
Vitamin K2 supplementation increases the activation of matrix Gla protein in rats with and without chronic kidney disease.
In rats, vitamin K2 supplementation lowers calcium buildup in blood vessels, but it does not reduce abnormal tissue growth in the same vessels, even in rats with kidney disease.
Chronic kidney disease and surgical arterialization directly cause increased thickening and calcium buildup in veins, and blocking vitamin K worsens this process.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.