[SECOT consensus on thromboembolisms in knee and hip replacement surgery]

The purpose of this paper is to develop a professional consensus that proposes, in the light of the current scientific evidence and the clinical experience of an expert panel, some clinical recommendations directed at the Orthopaedic and Trauma Surgery (OTS) specialist and with the aim of reducing the variability in the prophylactic management of venous thromboembolic disease in knee and hip arthroplasty in clinical practice. The Delphi method was used, which consisted of two rounds of an e-mail questionnaire. Of the 55 items considered, a consensus was reached in 37 (67.2%) of them. In 31 cases there was consensus with the formulation of the item, and in 6 cases there was no agreed consensus. It was observed that there was a consensus in multiple clinical recommendations that could help OTS specialists in the making of decisions in their clinical practice.

[Thromboprophylaxis with enoxaparin for total knee replacement: an observational, retrospective and multicentre study comparing starting the treatment before and after the operation]

OBJECTIVE

The low molecular weight heparins are the first option for the prophylaxis of venous thromboembolic disease in major orthopaedic surgery. The time of starting their administration is controversial. The aim of this study was to evaluate the efficacy and safety of enoxaparin in patients subjected to total knee replacement comparing the starting of it before and after the surgery.

METHODS

An observational, retrospective and multicentre study of normal clinical practice to determine the incidence of symptomatic deep venous thrombosis and/or pulmonary thromboembolism in total knee replacement surgery. Thromboprophylaxis was normal practice in each centre. Patients were included if they received the first dose of 40 mg/24 h of enoxaparin either 12 h (± 2 h) before the surgery (G-PRE) or between 6 and 12 hours after the surgery (G-POST). The main safety objective was haemorrhage. A multivariate logistic regression analysis was performed to determine the real influence of each variable.

RESULTS

Data was collected from 2014 patients, of whom 1440 were included for the analysis of efficacy (782/1440, 54% of the G-PRE and 658/1440, 46% of the G-POST). The mean incidence of symptomatic thrombotic events was 1.67% (24/1440). The incidence of deep venous thrombosis in the G-PRE was 1.15% compared to 1.22% in the G-POST (P=.569 after multivariate analysis) and the incidence of pulmonary thromboembolism was 0.51 compared to 0.76%, respectively (P=.582 after multivariate analysis). A total of 1422 patients were included for the safety analysis. There was significant bleeding in 59/788 of the G-PRE and in 35/634 of the G-POST (7.49% compared to 5.52%, respectively, P=.138).

CONCLUSIONS

These results suggest that thromboprophylaxis with enoxaparin (40 mg/24 h sc) in patients subjected to total knee replacement surgery has a similar safety and effective profile when it is given 12 hours before the surgery or between 6 and 12 hours afterwards.

Efficacy and safety of bemiparin compared with enoxaparin in the prevention of venous thromboembolism after total knee arthroplasty: a randomized, double-blind clinical trial

In this randomized, multicenter, controlled, double-blind, sequential trial, 381 patients undergoing primary total knee replacement were randomly assigned to receive subcutaneous injections of either 3500 IU anti-factor Xa of bemiparin sodium, first dose 6 h after surgery, or 40 mg of enoxaparin, first dose 12 h before surgery, followed by daily doses for 10 +/- 2 days, for the prophylaxis of venous thromboembolism. The primary efficacy endpoint was venous thromboembolism up to postoperative day 10 +/- 2, defined as deep vein thrombosis detected by mandatory bilateral venography, documented symptomatic deep vein thrombosis and/or documented symptomatic pulmonary embolism. The primary safety endpoint was major bleeding. Eighty-seven percent of all randomized patients (333 of 381 patients) were evaluable for efficacy. The incidence of venous thromboembolism was 32.1% (53 of 165 patients) in the bemiparin group and 36.9% (62 of 168 patients) in the enoxaparin group. The absolute risk difference was 4.8% in favor of bemiparin [95% confidence interval (CI), -15.1% to 5.6%; non-inferiority P-value: 0.02; superiority P-value: 0.36]. The incidence of proximal deep vein thrombosis was 1.8% (three of 165 patients) in the bemiparin group and 4.2% (seven of 168 patients) in the enoxaparin group. Major bleeding occurred in six patients (three in each group). There were no deaths during the study. This trial shows that bemiparin started postoperatively is as effective and safe as enoxaparin started preoperatively in the prevention of venous thromboembolism in patients undergoing total knee replacement.