François-Emery Cotté1, Hicham Benhaddi2, Isabelle Duprat-Lomon2, Adam Doble3, Nick Marchant4, Alexia Letierce5, Michael Huguet5. 1. Health Economics & Outcomes Research, Bristol-Myers Squibb, Rueil-Malmaison, France. Electronic address: francois-emery.cotte@bms.com. 2. Health Economics & Outcomes Research, Bristol-Myers Squibb, Rueil-Malmaison, France. 3. Foxymed, Paris, France. 4. Pfizer, Walton Oaks, United Kingdom. 5. Cegedim Strategic Data, Boulogne-Billancourt, France.
Abstract
PURPOSE: Patients with atrial fibrillation are at increased risk for stroke and thus require anticoagulant prophylaxis with vitamin K antagonists. However, many such patients fail to achieve target coagulation status. The objective of this study was to evaluate time in the therapeutic range and its relationship to clinical outcomes in patients with nonvalvular atrial fibrillation prescribed a vitamin K antagonist in everyday clinical practice in 4 European countries (France, Germany, Italy and the United Kingdom). METHODS: Data were extracted from the European electronic primary care database, the Longitudinal Patient Database. Included in the analysis were 6250 adult patients for whom data on monitoring of coagulation time and international normalized ratio were available. The time within the therapeutic range was estimated by using the Rosendaal method. Patients spending >70% of time within the therapeutic range were considered to have well-controlled treatment. Data on stroke and bleeding events occurring during the study period were taken from patient records. Stroke risk was calculated by using the CHA2DS2-VASc score (i.e. 2 points for a history of stroke or TIA and age >75 years, and 1 point for age between 65 and 74 years, hypertension, diabetes mellitus, a recent cardiac failure, vascular disease and female sex). FINDINGS: The proportion of patients with poorly controlled treatment varied from 34.6% in the United Kingdom to 55.8% in Germany. The incidence of stroke was 0.5/100 person-years in well-controlled patients, compared with 1.0/100 in poorly controlled patients. After adjustment for stroke risk factors, the odds ratio was 1.38 (95% CI, 0.93-2.06; P = 0.110). The incidence of hemorrhage was 1.1 and 1.3 events/100 person-years, respectively (odds ratio, 0.91 [95% CI, 0.72-1.16]). IMPLICATIONS: Many patients receiving prophylaxis with vitamin K antagonists in everyday community care have poorly controlled anticoagulation treatment with vitamin K antagonists. Their international normalized ratio is frequently outside the therapeutic range, and they are thus exposed to an unnecessary risk of stroke or bleeding complications.
PURPOSE:Patients with atrial fibrillation are at increased risk for stroke and thus require anticoagulant prophylaxis with vitamin K antagonists. However, many such patients fail to achieve target coagulation status. The objective of this study was to evaluate time in the therapeutic range and its relationship to clinical outcomes in patients with nonvalvular atrial fibrillation prescribed a vitamin K antagonist in everyday clinical practice in 4 European countries (France, Germany, Italy and the United Kingdom). METHODS: Data were extracted from the European electronic primary care database, the Longitudinal Patient Database. Included in the analysis were 6250 adult patients for whom data on monitoring of coagulation time and international normalized ratio were available. The time within the therapeutic range was estimated by using the Rosendaal method. Patients spending >70% of time within the therapeutic range were considered to have well-controlled treatment. Data on stroke and bleeding events occurring during the study period were taken from patient records. Stroke risk was calculated by using the CHA2DS2-VASc score (i.e. 2 points for a history of stroke or TIA and age >75 years, and 1 point for age between 65 and 74 years, hypertension, diabetes mellitus, a recent cardiac failure, vascular disease and female sex). FINDINGS: The proportion of patients with poorly controlled treatment varied from 34.6% in the United Kingdom to 55.8% in Germany. The incidence of stroke was 0.5/100 person-years in well-controlled patients, compared with 1.0/100 in poorly controlled patients. After adjustment for stroke risk factors, the odds ratio was 1.38 (95% CI, 0.93-2.06; P = 0.110). The incidence of hemorrhage was 1.1 and 1.3 events/100 person-years, respectively (odds ratio, 0.91 [95% CI, 0.72-1.16]). IMPLICATIONS: Many patients receiving prophylaxis with vitamin K antagonists in everyday community care have poorly controlled anticoagulation treatment with vitamin K antagonists. Their international normalized ratio is frequently outside the therapeutic range, and they are thus exposed to an unnecessary risk of stroke or bleeding complications.
Authors: Tanja Mueller; Samantha Alvarez-Madrazo; Chris Robertson; Marion Bennie Journal: Pharmacoepidemiol Drug Saf Date: 2017-07-28 Impact factor: 2.890
Authors: Leiliane Rodrigues Marcatto; Luciana Sacilotto; Francisco Carlos da Costa Darrieux; Denise Tessariol Hachul; Maurício Ibrahim Scanavacca; Jose Eduardo Krieger; Alexandre Costa Pereira; Paulo Caleb Junior Lima Santos Journal: Oncotarget Date: 2016-08-23