Subscribe to RSS
DOI: 10.1055/s-2003-44462
Optimizing the Efficacy and Safety of Oral Anticoagulant Therapy: High-Quality Dose Management, Anticoagulation Clinics, and Patient Self-Management
Publication History
Publication Date:
21 November 2003 (online)
![](https://www.thieme-connect.de/media/svm/200303/lookinside/thumbnails/10.1055-s-2003-44462-1.jpg)
ABSTRACT
Despite its widespread use, oral anticoagulation therapy suffers from a number of problems that lead to underuse and inadequate treatment. Problems include its narrow therapeutic index, the influence of many concomitant conditions or comorbidities, and the need for high-quality dose management. Poor management of oral anticoagulation is a prime factor influencing the occurrence of adverse events. As a result of these problems, special programs or anticoagulation management services (AMSs) have developed to manage oral anticoagulation. Such programs have demonstrated a significant improvement in outcomes compared with traditional or usual care (UC) by individual physicians. With the introduction of point-of-care prothrombin time monitors, the potential for patient self-testing and self-management has developed. Studies show the possibility of even further improvement in outcomes compared with UC, although the differences from those achieved with an AMS are less impressive.
KEYWORDS
Oral anticoagulation - warfarin - prothrombin time - International Normalized Ratio - adverse events - point-of-care monitoring
REFERENCES
- 1 Ansell J. Oral anticoagulant therapy-50 years later. Arch Intern Med . 1993; 153 586-596
- 2 Ansell J E. Anticoagulation management as a risk factor for adverse events: grounds for improvement. J Thromb Thrombolys . 1998; 5 S13-S18
- 3 Kutner M, Nixon G, Silverstone F. Physicians' attitudes toward oral anticoagulants and antiplatelet agents for stroke prevention in elderly patients with atrial fibrillation. Arch Intern Med . 1991; 151 1950-1953
- 4 McCrory D C, Matchar D B, Samsa G, Sanders L L, Pritchett E LC. Physician attitudes about anticoagulation for nonvalvular atrial fibrillation in the elderly. Arch Intern Med . 1995; 155 277-281
- 5 Chang H J, Bell J R, Deroo D B, Kirk J W, Wasson J H, Dartmouth Primary Care COOP Project. Physician variation in anticoagulating patients with atrial fibrillation. Arch Intern Med . 1990; 150 83-84
- 6 Ansell J, Hirsh J, Dalen J. et al . Managing oral anticoagulant therapy. Chest . 2001; 119 22S-38S
- 7 Loeliger E A, Poller L, Samama M, Thomson J M, van den Besselaar A H P M, Vermylen J, Verstraete M. Questions and answers on prothrombin time standardization in oral anticoagulant control. Thromb Haemostas . 1985; 54 515-517
- 8 Ansell J E, Hughes R. Evolving models of warfarin management: anticoagulation clinics, patient self-monitoring and patient self-management. Am Heart J . 1996; 132 1095-1100
- 9 Ansell J E. Patient self-testing and patient self-management of oral anticoagulation with point-of-care testing. In: GJ Kost, ed. Principles and Practice of Point-of-Care Testing Philadelphia: Lippincott Williams & Wilkins; 2002: 368-375
- 10 Gitter M J, Jaeger T M, Petterson T M, Gersh B J, Silverstein M D. Bleeding and thromboembolism during anticoagulant therapy: a population based study in Rochester, Minnesota. Mayo Clinic Proc . 1995; 70 725-733
- 11 Beyth R J, Quinn L M, Landefeld C S. Prospective evaluation of an index for predicting the risk of major bleeding in outpatients treated with warfarin. Am J Med . 1998; 105 91-99
- 12 Fihn S D, McDonell M, Martin D. et al . Risk factors for complications of chronic anticoagulation: a multicenter study. Ann Intern Med . 1993; 118 511-520
- 13 van der Meer J F, Rosendaal F R, Vandenbrouke J P, Briet E. Bleeding complications in oral anticoagulant therapy: an analysis of risk factors. Arch Intern Med . 1993; 153 1557-1562
- 14 Cannegieter S C, Rosendaal F R, Wintzen A R, van der Meer J M F, Vandenbroucke J P, Briet E. Optimal oral anticoagulant therapy in patients with mechanical heart valves. N Engl J Med . 1995; 33 11-17
- 15 Hylek E M, Singer D E. Risk factors for intracranial hemorrhage in outpatients taking warfarin. Ann Intern Med . 1994; 120 897-902
- 16 Hylek E M, Skates S J, Sheehan M A, Singer D E. An analysis of the lowest effective intensity of prophylactic anticoagulation for patients with nonrheumatic atrial fibrillation. N Engl J Med . 1996; 335 540-546
- 17 Petitti D B, Strom B L, Melmon K L. Prothrombin time ratio and other factors associated with bleeding in patients treated with warfarin. J Clin Epidemiol . 1989; 42 759-764
- 18 Landefeld C S, Rosenblatt M W, Goldman L. Bleeding in outpatients treated with warfarin: relation to the prothrombin time and important remedial lesions. Am J Med . 1989; 87 153-159
- 19 White R H, McKittrick T, Takakuwa J. et al . Management and prognosis of life-threatening bleeding during warfarin therapy. Arch Intern Med . 1996; 156 1197-1201
- 20 Launbjerg J, Egeblad H, Heaf J, Nielsen N H, Fugleholm A M, Ladefoged K. Bleeding complications to oral anticoagulant therapy: multivariate analysis of 1010 treatment years in 551 outpatients. J Intern Med . 1991; 229 351-355
- 21 Cortelazzo S, Finazzi G, Viero P. et al . Thrombotic and hemorrhagic complications in patients with mechanical heart valve prosthesis attending an anticoagulation clinic. Thromb Hemost . 1993; 69 316-320
- 22 Palareti G, Leali N, Coccheri S. et al . Bleeding complications of oral anticoagulant treatment: an inception-cohort, prospective collaborative study (ISCOAT). Lancet . 1996; 348 423-428
- 23 Landefeld S, Beyth R J. Anticoagulant-related bleeding: clinical epidemiology, prediction, and prevention. Am J Med . 1993; 95 315-328
- 24 Sixty Plus Reinfarction Study Research Group. Risks of long-term oral anticoagulant therapy in elderly patients after myocardial infarction. Second report of the Sixty Plus Reinfarction Study Research Group. Lancet . 1982; I 62-68
- 25 Charney R, Leddomado E, Rose D N, Fuster V. Anticoagulation clinics and the monitoring of anticoagulant therapy. Int J Cardiol . 1988; 18 197-206
- 26 Forfar J C. Prediction of hemorrhage during long-term oral coumarin anticoagulation by excessive prothrombin ratio. Am Heart J . 1982; 103 445-446
- 27 Errichetti A M, Holden A, Ansell J. Management of oral anticoagulant therapy: experience with an anticoagulation clinic. Arch Intern Med . 1984; 144 1966-1968
- 28 Petty G W, Lennihan L, Mohr J P. et al . Complications of long-term anticoagulation. Ann Neurol . 1988; 23 570-574
- 29 Bussey H I, Rospond R M, Quandt C M, Clark G M. The safety and effectiveness of long-term warfarin therapy in an anticoagulation clinic. Pharmacotherapy . 1989; 9 214-219
- 30 Gurwitz J, Goldberg R, Holden A, Knapic N, Ansell J. Age-related risks of long-term oral anticoagulant therapy. Arch Intern Med . 1988; 148 1733-1736
- 31 McInnes G T, Helenglass G. The performance of clinics for outpatient control of anticoagulation. J R Coll Physicians Lond . 1987; 21 42-45
- 32 Wickramasinghe L SP, Basu S K, Bansal S K. Long-term oral anticoagulant therapy in elderly patients. Age Aging . 1988; 17 388-396
- 33 Joglekar M, Mohanaruban K, Bayer A J, Pathy M SJ. Can old people on oral anticoagulants be safely managed as outpatients?. Postgrad Med J . 1988; 64 775-777
- 34 Issacs C, Paltiel O, Blake G, Beaudet M, Conochie L, Leclerc J. Age-associated risks of prophylactic anticoagulation in the setting of hip fracture. Am J Med . 1994; 96 487-491
- 35 Davis F B, Estruch M T, Samson-Cervera E B. et al . Management of anticoagulation in outpatients: experience with an anticoagulation service in a municipal hospital setting. Arch Intern Med . 1977; 137 197-202
- 36 Landefeld C S, Goldman L. Major bleeding in outpatients treated with warfarin. Incidence and prediction by factors known at the start of outpatient therapy. Am J Med . 1989; 87 144-152
- 37 Coon W W, Willis P W. Hemorrhagic complications of anticoagulant therapy. Arch Intern Med . 1974; 133 386-392
- 38 Stroke Prevention in Atrial Fibrillation Investigators. Bleeding during antithrombotic therapy in patients with atrial fibrillation. Arch Intern Med . 1996; 156 409-416
- 39 Fihn S D, Callahan C M, Martin D C. et al . The risk for and severity of bleeding complication in elderly patients treated with warfarin. Ann Intern Med . 1996; 124 970-979
- 40 Stroke Prevention in Atrial Fibrillation Investigators. Adjusted-dose warfarin versus low-intensity, fixed-dose warfarin plus aspirin for high-risk patients with atrial fibrillation: stroke prevention in atrial fibrillation III randomized clinical trial. Lancet . 1996; 348 633-638
- 41 McCormick D, Gurwitz J H, Goldberg J, Ansell J. Long-term anticoagulation therapy for atrial fibrillation in elderly patients: efficacy, risk, and current patterns of use. J Thromb Thrombolys . 1999; 7 157-163
- 42 Pettiti D B, Strom B L, Melmon K L. Duration of warfarin anticoagulation therapy and the probabilities of recurrent thromboembolism and hemorrhage. Am J Med . 1986; 81 255-259
- 43 Ansell J E, Buttaro M L, Voltis T O, Knowlton C H, Anticoagulation Guidelines Task Force. Consensus guidelines for coordinated outpatient oral anticoagulation therapy. Annals of Pharmacotherapy . 1997; 31 604-615
- 44 Conte R R, Kehoe W A, Nielson N, Lodhia H. Nine-year experience with a pharmacist-managed anticoagulation clinic. Am J Hosp Pharm . 1986; 43 2460-2464
- 45 Seabrook G R, Karp D, Schmitt D D, Bandyk D F. An outpatient anticoagulation protocol managed by a vascular nurse-clinician. Am J Surg . 1990; 160 501-504
- 46 Palareti G, Manotti C, D'Angelo A. et al . Thrombotic events during anticoagulant treatment: results of the inception-cohort, prospective, collaborative ISCOAT study. Thromb Haemost . 1997; 78 1438-1443
- 47 Garabedian-Ruffalo S M, Gray D R, Sax M J. et al . Retrospective evaluation of a pharmacist-managed warfarin anticoagulation clinic. Am J Hosp Pharm . 1985; 42 304-308
- 48 Wilt V M, Gums J G, Amhed O I, Moore L M. Outcome analysis of a pharmacist-managed anticoagulation service. Pharmacotherapy . 1995; 15 732-739
- 49 Chiquette E, Amato M G, Bussey H I. Comparison of an anticoagulation clinic and usual medical care: anticoagulation control, patient outcomes, and health care costs. Arch Intern Med . 1998; 158 1641-1647
- 50 Matchar D B, Samsa G P, Cohen S J, Oddone E Z, Jurgelski A E. Improving the quality of anticoagulation of patients with atrial fibrillation in managed care organizations: results of the Managing Anticoagulation Services Trial. Am J Med . 2002; 113 42-51
- 51 Gray D R, Garabedian-Ruffalo S M, Chretien S D. Cost-justification of a clinical pharmacist-managed anticoagulation clinic. Drug Intell Clin Pharm . 1985; 19 575-580
- 52 Lucas F V, Duncan A, Jay R. et al . A novel whole blood capillary technique for measuring prothrombin time. Am J Clin Pathol . 1987; 88 442-446
- 53 Yano Y, Kambayashi J, Murata K. et al . Bedside monitoring of warfarin therapy by a whole blood capillary coagulation monitor. Thromb Res . 1992; 66 583-590
- 54 Weibert R T, Adler D S. Evaluation of a capillary whole blood prothrombin time measurement system. Clin Pharm . 1989; 8 864-867
- 55 Oberhardt B J, Dermott S C, Taylor M, Alkadi Z Y, Abruzzini A F, Gresalfi N J. Dry reagent technology for rapid, convenient measurements of blood coagulation and fibrinolysis. Clin Chem . 1991; 37 520-526
- 56 Rose V L, Dermott S C, Murray B F. et al . Decentralized testing for prothrombin time and activated partial thromboplastin time using a dry chemistry portable analyzer. Arch Pathol Lab Med . 1993; 117 611-617
- 57 Fabbrini N, Messmore H, Balbale S. et al . Pilot study to determine use of a TAS analyzer in an anticoagulation clinic setting. Blood . 1995; 86 (suppl 1) 869a
- 58 Ansell J, Becker D, Andrew M. et al . Accurate and precise prothrombin time measurement in a multicenter anticoagulation trial employing patient self-testing. Blood . 1995; 86 (suppl 1) 864a
- 59 Ansell J E, Zweig S, Meyer B, Zehnder J, Lewis J. Performance of the AvocetPT prothrombin time system. Blood . 1998; 92 (suppl 1) 112b
- 60 Jennings I, Luddington R J, Baglin T. Evaluation of the Ciba Corning Biotrack 512 coagulation monitor for the control of oral anticoagulation. J Clin Pathol . 1991; 44 950-953
- 61 McCurdy S A, White R H. Accuracy and precision of a portable anticoagulation monitor in a clinical setting. Arch Intern Med . 1992; 152 589-592
- 62 Tripodi A, Arbini A A, Chantarangkul V. et al . Are capillary whole blood coagulation monitors suitable for the control of oral anticoagulant treatment by the International Normalized Ratio?. Thromb Haemostas . 1993; 70 921-924
- 63 van den Besselaar A H P M, Breddin K, Lutze G. et al . Multicenter evaluation of a new capillary blood prothrombin time monitoring system. Blood Coag Fibrinolys . 1995; 6 726-732
- 64 Tripodi A, Chantarangkul V, Clerici M, Negri B, Mannucci P M. Determination of the international sensitivity index of a new near-patient testing device to monitor oral anticoagulant therapy. Thromb Haemost . 1997; 78 855-858
- 65 Kaatz A A, White R H, Hill J. et al . Accuracy of laboratory and portable monitor International Normalized Ratio determinations. Arch Intern Med . 1995; 155 1861-1867
-
66
Portable prothrombin time monitors.
Med Lett Drugs Ther 1995 Mar 17;37(944):24 .
- 67 Byeth R J, Quinn L, Landefeld C S. A multicomponent intervention to prevent major bleeding complications in older patients receiving warfarin: a randomized controlled trial. Ann Intern Med . 2000; 133 687-695
- 68 Horstkotte D, Piper C, Wiemer M, Schulte H D, Schultheiss H-P. Improvement of prognosis by home prothrombin estimation in patients with life-long anticoagulant therapy. Eur Heart J . 1996; 17(suppl) 230
- 69 Hasenkam J M, Kimose I I, Knudsen L. et al . Self-management of oral anticoagulant therapy after heart valve replacement. Eur J Cardiothorac Surg . 1997; 11 935-942
- 70 Sawicki P T. et al . A structured teaching and self-management program for patients receiving oral anticoagulation. A randomized controlled trial. JAMA . 1999; 281 145-150
- 71 Kortke H, Korfer R. International normalized ratio self-management after mechanical heart valve replacement: is an early start advantageous?. Ann Thorac Surg . 2001; 72 44-48
- 72 White R H, McCurdy S A, von Marensdorff H, Woodruff D E, Leftgoff L. Home prothrombin time monitoring after initiation of warfarin therapy. Ann Intern Med . 1989; 111 730-737
- 73 Kaatz S, Elston-Lafata J, Gooldy S. Anticoagulation therapy home and office monitoring evaluation study. J Thromb Thrombolys . 2001; 12 111
- 74 Ansell J, Patel N, Ostrovsky D, Nozzolillo E, Peterson A M, Fish L. Long-term patient self-management of oral anticoagulation. Arch Intern Med . 1995; 155 2185-2189
- 75 Watzke H H, Forberg E, Svolba G, Jimenez-Boj E, Krinninger B. A prospective controlled trial comparing weekly self-testing and self-dosing with the standard management of patients on stable oral anticoagulation. Thromb Haemost . 2000; 83 661-665
- 76 Cromheecke M E, Levi M, Colly L P. et al . Oral anticoagulation self-management and management by a specialist anticoagulation clinic: a randomized cross-over comparison. Lancet . 2000; 356 97-102
- 77 Gadisseur A PA, Breukink-Engbers W GM, van der Meer J M F, Rosendaal F R. Comparison of the quality of oral anticoagulant therapy through patient self-management versus management by specialised anticoagulation clinics in the Netherlands. Thromb Haemost 2001;86(suppl):abst #OC161.