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To evaluate the efficacy and safety of the DTI protocol, the incidence of thromboembolism or thromboembolism progression after DTI initiation and the occurrence of major bleeding attributable to DTI therapy (defined as an acute bleed causing a drop in hemoglobin ��3 g dL?1, hemodynamic instability, and/or requiring transfusion of blood products) were evaluated. Additionally, argatroban and bivalirudin dosages, patient individualized mean aPTT ratio achieved, length of DTI therapy, and mortality were examined. Sample size was determined based on previous studies of argatroban and bivalirudin http://www.selleckchem.com/products/cb-839.html that have demonstrated a mean time to therapeutic aPTT goal of 8.5 �� 5.9 to 24 �� 14.1 hr [10, 18]. For our study, a difference of 6 hr in time to achieve a therapeutic aPTT was considered clinically significant. Utilizing a standard http://www.selleck.cn/products/wnt-c59-c59.html deviation of 10 hr, and a two-sided significance level of 0.05, at least 45 patients were necessary in each group to have an 80% power to detect the 6-hr difference. Data are presented as proportions or mean �� SD unless indicated otherwise. Categorical data were compared using the Fisher's exact test or Chi-square test where appropriate. Continuous variables were compared using the Mann-Whitney U test or Student t test as appropriate. Between-group analysis was performed for the primary outcome using the Kaplan�CMeier with log-rank test. Analysis of covariance and Cox proportional hazard model were utilized to account for differences in baseline demographics for the primary outcome. The covariates in the models were hematology consultation, positive HIT laboratory test, time to first aPTT measurement, and frequency of aPTT measurement. All tests were two-tailed. Statistical analyses of the results was performed using SAS software version 9.2 (SAS Institute, Cary, NC), GraphPad Prism 4.0 (GraphPad Software, San Diego, CA), and InStat 3.06 (GraphPad Software, San Diego, CA). A P value http://www.selleckchem.com/products/BI6727-Volasertib.html this study. Eighty three patients were included in the historical control group and 47 patients were included in the protocol treatment group. Fifty-four percent of patients were treated with argatroban and 46% of patients were treated with bivalirudin. On average, patients were 54 �� 15 years old, 82 �� 28 kg; 63% male, and 78% were located in the ICU when the DTI was initiated (Table I). Patients were most commonly admitted to the cardiology (25%), cardiothoracic surgery (22%), pulmonary critical care (22%), surgery critical care (12%), medicine (7%), or neurosurgery services (5%).