Browse > Article

Determination of Practical Dosing of Warfarin in Korean Outpatients with Mechanical Heart Valves  

Lee Ju Yeun (Department of Pharmacy, Seoul National University Hospital)
Jeong Young Mi (Department of Pharmacy, Seoul National University Bundang Hospital)
Lee Myung Koo (College of Pharmacy, Chungbuk National University)
Kim Ki-bong (Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital)
Ahn Hyuk (Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital)
Lee Byung Koo (Department of Pharmacy, Seoul National University Bundang Hospital)
Publication Information
Journal of Chest Surgery / v.38, no.11, 2005 , pp. 761-772 More about this Journal
Abstract
Background: Following the implantation of heart valve prostheses, it is important to maintain therapeutic INR to reduce the risk of thromboembolism. The objective of this study was to suggest a practical dosing guideline for Korean outpatients with prosthetic heart valves managed by a pharmacist-run anticoagulation service (ACS). Material and Method: A retrospective chart review was completed for all patients enrolled in the ACS at Seoul National University Hospital from March, 1997 to September, 2000. Patients who were at least 6 months post-valve replacement and had nontherapeutic INR value (less than 2.0 or greater than 3.0) were included. The data on 688 patients (1,782 visits) requiring dosing adjustment without any known drug or food interaction with warfarin were analyzed. The amount of adjusted dose and INR changes based on the INR at the time of the event were calculated. Aortic valve replacements (AVR) patients and mitral or double valve replacement (MVR/DVR) patients were evaluated separately. Result: Two methods for the warfarin dosage adjustment were suggested: Guideline I (mg-based total weekly dose (TWD) adjustment), Guideline II (percentage-based TWD adjustment). The effectiveness of Guideline 1 was superior to Guideline II overall in patients with both AVR and MVR/DVR. Conclusion: The guideline suggested in this study could be useful when the dosage adjustment of wafarin is necessary in outpatients with mechanical heart valves.
Keywords
Warfarin; Dose response relationship; drug; Heart valve prosthesis; Anticoagulants;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Tiede DJ, Nishimura RA, Gastineau DA, et al. Modern management of prosthetic valve anticoagulation. Mayo Clin Proc 1998;73:665-80   DOI   ScienceOn
2 Michelson AD, Bovill E, Monagle P, Andrew M. Antithrombotic therapy in children. Chest 1998;114(Suppl):748- 69   DOI   ScienceOn
3 Ryan PJ, Gilbert M, Rose PE. Computer control of anticoagulant dose for therapeutic management. Br Med J 1989; 299:1207-9   DOI   ScienceOn
4 Kim CW, Kim YT. Anticoagulation in Patients with St. Jude medical prosthesis. Korean J Thorac Cardiovasc Surg 1998; 31:684-91
5 Lee JY. Prediction of warfarin maintenance dose from initial response in Korean cardiac valve surgery patients. Thesis for the degree of Master of Science in Pharmacy at Seoul National University. 1999
6 Brigden ML, Kay CLA, Graydon C, McLeod B. Audit of the frequency and clinical response to excessive oral anticoagulation in an out-patient population. Am J Hematol 1998;59:22-7   DOI   ScienceOn
7 Ansell J, Hirsh J, Dalen J, Bussey H, Anderson D, Poller L, Jacobson A, Deykin D. Managing oral anticoagulant therapy. Chest 2001;119:22S-38S   DOI   ScienceOn
8 Cannegieter SC, Rosendaal FR, Wintzen AR, et al. The optimal intensity of oral anticoagulant therapy in patients with mechanical heart valve prosthese: the Leiden artificial valve and anticoagulation study. N Engl J Med 1995;333: 11-7   DOI   ScienceOn
9 Ansell JE, Buttaro ML, Thomas OV, Knowlton CH. Consensus guidelines for coordinated outpatient oral anticoagulation therapy management. Anticoagulation Guidelines Task Force. Ann Pharmacother 1997;31:604-15   DOI
10 Jack Hirsh. Oral anticoagulants: Mechanism of action, clinical effectiveness, and optimal therapeutic range. Chest 2001; 119:8S-21S   DOI   ScienceOn
11 Lousberg TR, Witt DM, Beall DG, et al. Evaluation of excessive anticoagulation in a group model health maintenance organization. Arch Intern Med 1998;158:528-34   DOI   ScienceOn
12 Petty GW, Lennihan L, Mohr JP, et al. Complications of long-term anticoagulation. Ann Neurol 1988;23:570-4   DOI   ScienceOn
13 Haemostasis and thrombosis task force for the british committee for standards in haematology. Guideline, Guidelines on oral anticoagualtion: 3rd ed. Br J Haematol 1998;101: 374-87   DOI   PUBMED   ScienceOn
14 Triplett DA. Current recommendations for warfarin treatment, use and monitoring. Med Clin North Am 1998;82:601-11   DOI   ScienceOn
15 Oertel LB. Managing maintenance therapy. In: Ansell JE, Oertel LB, Wittkowsky AK. Managing oral anticoagulation therapy: Clinical and operation guidelines. Gaithersburg, Maryland: An Aspen Publication, 1997:4B-2:1-4B-3:21
16 Britt RP, James AH, Raskino CL, Thompson SG. Factors affecting the precision of warfarin treatment. J Clin Pathol 1992;45:1003-6   DOI   PUBMED
17 Choi SA, Jeong YM, Chung SY, et al. Anticoagulant control in the first six months after mechanical heart valve replacement and Analysis of affecting factors. J Korean Health-syst Pharm 2000;17: 281-5
18 White RH, Zhou H, Romano P, Mungall D. Changes in plasma warfarin levels and variations in steady-state prothrombin times. Clin Pharmacol Ther 1995;58:588-93   DOI   ScienceOn
19 Fredriks DA, Coleman RW. Nomogram for dosing warfarin at steady state. Clin Pharm 1991;10:923-7
20 Ansell JE, Patel N, Ostrovsky D, et al. Long-term patient self-management of oral anticoagulation. Arch Intern Med 1995;155:2185-9   DOI   ScienceOn
21 Gage BF, Fihn SD, White RH. Management and dosing of warfarin therapy. Am J Med 2000;109:481-8   DOI   ScienceOn
22 Hathaway WE, Goodnight SH. Disorders of hemostasis and thrombosis: a clinical guide. New York: McGraw-Hill Health Professions Division; 1993
23 Rose JP, Rihn TL, Long SF. Warfarin sensitivity after mechanical heart valve replacement. Pharmacotherapy 1998; 18:856-9
24 Wieland KA. Initiation of therapy and estimation of maintenance dose. In: Ansell JE, Oertel LB, Wittkowsky AK. Managing oral anticoagulation therapy: Clinical and operation guidelines. Gaithersburg, Maryland: An Aspen Publication, 1997:4B-2:1-4B-3:21