Abstract:
BACKGROUND:Dietary intake of vitamin K has been reported to reduce coronary artery calcification (CAC) and cardiovascular events. However, it is unknown whether supplemental menaquinone (MK)-4 can reduce CAC or arterial stiffness. To study the effect of MK-4 supplementation on CAC and brachial ankle pulse wave velocity (baPWV). METHODS:This study is a single arm design to take 45 mg/day MK-4 daily as a therapeutic drug for 1 year. Primary endpoint was CAC score determined using 64-slice multislice CT (Siemens), and the secondary endpoint was baPWV measured before and 1 year after MK-4 therapy. RESULTS:A total of 26 patients were enrolled. The average age was 69 ± 8 years and 65 % were female. Plasma levels of phylloquinone (PK), MK-7, and MK4 were 1.94 ± 1.38 ng/ml, 14.2 ± 11.9 ng/ml and 0.4 ± 2.0 ng/ml, respectively, suggesting that MK-7 was the dominant vitamin K in the studied population. Baseline CAC and baPWV were 513 ± 773 and 1834 ± 289 cm/s, respectively. At 1 year following MK-4 supplementation, the values were 588 ± 872 (+14 %) and 1821 ± 378 cm/s (-0.7 %), respectively. In patients with high PIVKA-2, -18 % annual reduction of baPWV was observed. CONCLUSION:Despite high dose MK-4 supplementation, CAC increased +14 % annually, but baPWV did not change (-0.7 %). The benefits of MK-4 supplementation were only observed in patients with vitamin K insufficiencies correlated with high PIVKA-2 baseline levels, reducing baPWV but not CAC. TRIAL REGISTRATION:This study was registered as UMIN 000002760.
journal_name
Nutr Jjournal_title
Nutrition journalauthors
Ikari Y,Torii S,Shioi A,Okano Tdoi
10.1186/s12937-016-0175-8subject
Has Abstractpub_date
2016-05-12 00:00:00pages
53issue
1issn
1475-2891pii
10.1186/s12937-016-0175-8journal_volume
15pub_type
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