Abstract
Brief reversal of oral anticoagulant therapy is frequently necessary prior to minor surgery or invasive procedures. We sought to determine the effect of an oral dose of 2.0 mg of vitamin K1 on the international normalized ratio (INR) among patients with a stable therapeutic INR who were maintained on their daily dose of warfarin. We prospectively studied a convenience cohort of patients attending an anticoagulation clinic who had either just completed treatment for venous thromboembolism or were receiving prophylaxis for atrial fibrillation, cardiomyopathy, or peripheral vascular disease. Each patient received an oral dose of 2.0 mg of aqueous vitamin K1. Serial INR measurements were taken over 1 week. There was wide variation in the INR response between patients, from no change to complete reversal of anticoagulation. The effect also varied widely over time. There was a significant inverse correlation between the fall in logarithm of the INR and the daily warfarin dose required to achieve an INR value of 2.5 (r = -0.52, p = 0.011). Use of a 2.0 mg oral dose of vitamin K1 does not reliably reverse (correct) a therapeutic INR in patients maintained on their daily dose of warfarin.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 149-153 |
| Number of pages | 5 |
| Journal | Journal of Thrombosis and Thrombolysis |
| Volume | 10 |
| Issue number | 2 |
| State | Published - 2000 |
Fingerprint
Keywords
- Anticoagulation
- INR
- Vitamin K
- Warfarin
ASJC Scopus subject areas
- Hematology
- Cardiology and Cardiovascular Medicine
Cite this
Temporary reversal of anticoagulation using oral vitamin K. / White, Richard H; Minton, S. M.; Andya, M. D.; Hutchinson, R.
In: Journal of Thrombosis and Thrombolysis, Vol. 10, No. 2, 2000, p. 149-153.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Temporary reversal of anticoagulation using oral vitamin K
AU - White, Richard H
AU - Minton, S. M.
AU - Andya, M. D.
AU - Hutchinson, R.
PY - 2000
Y1 - 2000
N2 - Brief reversal of oral anticoagulant therapy is frequently necessary prior to minor surgery or invasive procedures. We sought to determine the effect of an oral dose of 2.0 mg of vitamin K1 on the international normalized ratio (INR) among patients with a stable therapeutic INR who were maintained on their daily dose of warfarin. We prospectively studied a convenience cohort of patients attending an anticoagulation clinic who had either just completed treatment for venous thromboembolism or were receiving prophylaxis for atrial fibrillation, cardiomyopathy, or peripheral vascular disease. Each patient received an oral dose of 2.0 mg of aqueous vitamin K1. Serial INR measurements were taken over 1 week. There was wide variation in the INR response between patients, from no change to complete reversal of anticoagulation. The effect also varied widely over time. There was a significant inverse correlation between the fall in logarithm of the INR and the daily warfarin dose required to achieve an INR value of 2.5 (r = -0.52, p = 0.011). Use of a 2.0 mg oral dose of vitamin K1 does not reliably reverse (correct) a therapeutic INR in patients maintained on their daily dose of warfarin.
AB - Brief reversal of oral anticoagulant therapy is frequently necessary prior to minor surgery or invasive procedures. We sought to determine the effect of an oral dose of 2.0 mg of vitamin K1 on the international normalized ratio (INR) among patients with a stable therapeutic INR who were maintained on their daily dose of warfarin. We prospectively studied a convenience cohort of patients attending an anticoagulation clinic who had either just completed treatment for venous thromboembolism or were receiving prophylaxis for atrial fibrillation, cardiomyopathy, or peripheral vascular disease. Each patient received an oral dose of 2.0 mg of aqueous vitamin K1. Serial INR measurements were taken over 1 week. There was wide variation in the INR response between patients, from no change to complete reversal of anticoagulation. The effect also varied widely over time. There was a significant inverse correlation between the fall in logarithm of the INR and the daily warfarin dose required to achieve an INR value of 2.5 (r = -0.52, p = 0.011). Use of a 2.0 mg oral dose of vitamin K1 does not reliably reverse (correct) a therapeutic INR in patients maintained on their daily dose of warfarin.
KW - Anticoagulation
KW - INR
KW - Vitamin K
KW - Warfarin
UR - http://www.scopus.com/inward/record.url?scp=0033760691&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033760691&partnerID=8YFLogxK
M3 - Article
C2 - 11005937
AN - SCOPUS:0033760691
VL - 10
SP - 149
EP - 153
JO - Journal of Thrombosis and Thrombolysis
JF - Journal of Thrombosis and Thrombolysis
SN - 0929-5305
IS - 2
ER -