TY - JOUR
T1 - Predictors of anticoagulation quality in 15834 patients performing patient self-management of oral anticoagulation with vitamin K antagonists in real-life practice: a survey of the International Self-Monitoring Association of Orally Anticoagulated Patients
AU - Schaefer, Christian
AU - Wuillemin, Walter A.
AU - Kessels, Alfons
AU - Jacobson, Alan
AU - Nagler, Michael
PY - 2016/11
Y1 - 2016/11
N2 - Although patient self-management (PSM) of oral anticoagulation with vitamin K antagonists is recommended for patients requiring long-term anticoagulation, important aspects are still unclear. Using data from a large international survey (n=15834; median age 72years; 301% female), we studied predictors of poor anticoagulation control (percentage of International Normalized Ratio values within therapeutic range below 75%) and developed a simple prediction model. The following variables were identified as risk factors for poor anticoagulation control and included in the final model: higher intensity of therapeutic range (odds ratio [OR] on every level 19; 95% confidence interval [CI] 18-20), long intervals between measurements (>14d; 15; 95% CI 13-17), female sex (OR 13; 95% CI 12-14), and management other than PSM (OR 14; 95% CI 12-16). At a threshold of 02 (at least one variable present), the model predicted poor anticoagulation control with a sensitivity of 853% (95% CI: 840, 864) and a specificity of 285% (276, 295). The area under the receiver operated characteristic curve was 065. Using the proposed prediction model, physicians will be able to identify patients with a low chance of performing well, considering additional training, regular follow-up, or adjustment of therapeutic ranges.
AB - Although patient self-management (PSM) of oral anticoagulation with vitamin K antagonists is recommended for patients requiring long-term anticoagulation, important aspects are still unclear. Using data from a large international survey (n=15834; median age 72years; 301% female), we studied predictors of poor anticoagulation control (percentage of International Normalized Ratio values within therapeutic range below 75%) and developed a simple prediction model. The following variables were identified as risk factors for poor anticoagulation control and included in the final model: higher intensity of therapeutic range (odds ratio [OR] on every level 19; 95% confidence interval [CI] 18-20), long intervals between measurements (>14d; 15; 95% CI 13-17), female sex (OR 13; 95% CI 12-14), and management other than PSM (OR 14; 95% CI 12-16). At a threshold of 02 (at least one variable present), the model predicted poor anticoagulation control with a sensitivity of 853% (95% CI: 840, 864) and a specificity of 285% (276, 295). The area under the receiver operated characteristic curve was 065. Using the proposed prediction model, physicians will be able to identify patients with a low chance of performing well, considering additional training, regular follow-up, or adjustment of therapeutic ranges.
KW - vitamin K antagonists
KW - inhibitors
KW - self care
KW - International Normalized Ratio
KW - anticoagulant administration
KW - dosage
KW - drug monitoring
U2 - 10.1111/bjh.14273
DO - 10.1111/bjh.14273
M3 - Article
C2 - 27468696
SN - 0007-1048
VL - 175
SP - 677
EP - 685
JO - British Journal of Haematology
JF - British Journal of Haematology
IS - 4
ER -