Predictive value of international standardized ratio in early stage of warfarin therapy for anticoagulation intensity
10.3760/cma.j.issn.1008﹣5734.2019.04.003
- VernacularTitle:华法林抗凝治疗早期国际标准化比值对抗凝强度的预测价值
- Author:
Zhengrong LI
1
;
Juan WANG
;
Fangfang WU
;
Fengyuan CHE
;
Hongyan LI
;
ZengchEng SHI
;
Zhihong OU
Author Information
1. 山东大学附属临沂市人民医院药学部 276000
- Publication Type:Journal Article
- Keywords:
Warfarin;
Atrial fibrillation;
Anticoagulants;
ROC Curve;
International standardized ratio
- From:
Adverse Drug Reactions Journal
2019;21(4):252-257
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the predictive value of INR in early stage of warfarin therapy (early INR)for anticoagulation intensity after 7 days of treatment. Methods The medical records of patients hospitalized in the Department of Cardiology,Linyi People′s Hospital,Shandong University from January 2012 to May 2015 were collected,who received warfarin anticoagulation therapy and underwent INR tests in the morning after 3 or 7 days of medication. The early INR meant INR after 3 days of warfarin treatment. According to INR after 7 days of warfarin treatment,the patients were divided into 2 groups, anticoagulation up to standard(INR 2. 0﹣3. 0)group and over﹣anticoagulation(INR﹥3. 0)group. The best critical value of early INR for predicting INR after 7 days of warfarin treatment was obtained by plotting ROC curve. The risk of over﹣anticoagulation after 7 days of warfarin treatment was compared in patients with early INR ≥critical value and﹤critical value. Univariate analysis was used to compare the clinical characteristics in the 2 groups. The indexes with P ﹤0. 100 were used as covariate and multivariate logistic regression analysis was performed. The odds ratio( OR)and its 95% confidence interval( CI)was calculated and independent risk factors of INR ﹥3. 0 after warfarin treatment were screened. Results A total of 75 patients with atrial fibrillation were enrolled in the study,including 38 males and 37 females,aged(64 ± 9),42 patients in the anticoagulation up to standard group and 33 patients in the over﹣anticoagulation group. There were significant differences in body weight,INR after 3 days of medication,and the number of patients with hypoproteinemia between the 2 groups(all P﹤0. 05),but no significant differences in other indicators (all P﹥0. 05). The results of ROC curve showed that the best critical value of anticoagulation intensity predicted by early INR was 1. 67,the area under the curve was 0. 915[95% CI:0. 828﹣0. 967],and the sensitivity and specificity were 0. 95 and 0. 82,respectively. The risk of over﹣anticoagulation in patients with 7 days of warfarin treatment in the group with early INR ≥1. 67 was significantly higher than that in the group with early INR ﹤1. 67[90. 0%(27/30)vs. 13. 3%(6/45),χ2 ＝39. 883,OR＝58. 50,95% CI:13. 45﹣254. 48,P﹤0. 001]. Multivariate logistic regression analysis showed that early INR≥1. 67 was an independent risk factor for over﹣anticoagulation after 7 days of treatment( OR＝48. 719,95% CI:10. 891﹣217. 940,P﹤0. 001). Conclusions The early INR can predict anticoagulation intensity after 7 days of treatment. Early INR≥1. 67 is an independent risk factor for over﹣anticoagulation after 7 days of warfarin treatment.
