The objective of the SAFE K study is to demonstrate that in patients treated with the antagonists of vitamin K (VKA), a daily intake of vitamin K2 (75 micrograms/day) as naturally produced by the ferments used in fermented dairy products, does not upset the balance of anticoagulant treatment.Fifty-two patients will be chosen to receive either verum or placebo for four months after a 4-month run-in period.In addition, the study evaluates if regular consumption of vitamin K2 reduce the need of changing the dose of anticoagulation treatment and improve the markers of bone mineralisation.
Randomisation of the study subjects will be done by two randomisation lists depending on whether the dose of VKA is high or low. Randomisation will be balanced and stratified depending on the average dose of VKA before the inclusion in order that each arm would have the same number of patients receiving a dose lower than the used anticoagulant treatments. The level of vitamin K intake will be determined during the study visits using dietary questionnaire.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
SUPPORTIVE_CARE
Masking
QUADRUPLE
Enrollment
50
4 months retrospective period and 4 months dairy product + treatment (vitaminK2 or placebo) intervention
Unite de Recherches Therapeutiques, Hopital Lariboisiere
Paris, France
INR
Prothrombin time
Time frame: change from baseline at two months
INR
prothrombin time
Time frame: change from baseline at four months
c/uc osteocalcin ratio
immunoassay method
Time frame: change from baseline at two months
FVII from plasma
chronometric method
Time frame: change from baseline at two months
FII
chronometric method
Time frame: change from baseline at two months
Plasma vitamin K levels
HPLC
Time frame: change from base-line at two months
c/uc osteocalcin ratio
immunoassay method
Time frame: change from baseline at four months
FVII
chronometric method
Time frame: change from baseline at four months
FII
chronometric method
Time frame: change from baseline at four months
Plasma vitamin K level
HPLC
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Time frame: change from baseline at four months