These guidelines are not intended to serve or be construed as a standard of care. Pharmacological prophylaxis may also reduce symptomatic proximal DVTs (RR, 0.38; 95% CI, 0.14-1.00; very low certainty in the evidence of effects), but we are very uncertain of this finding. However, such studies would not be considered as high priority by the panel. Of the 7 studies included in the analysis, 2 studies compared ASA with UFH,193,195  4 studies compared ASA with LMWH,194,196,198,199  and 2 studies compared ASA with oral anticoagulants.197,199  All 7 studies reported the outcomes of mortality and PE,193-199  6 studies reported on proximal and distal DVTs,195-199  and 5 studies reported on major bleeding.194-196,198,199  We found no studies addressing the outcome of reoperation. For radical prostatectomy, the guideline provides a more nuanced set of recommendations that differ by surgical approach (open, laparoscopic, or robotically assisted laparoscopic) and extent of the node dissection (without, standard, or extended). We rated the overall certainty in the evidence of effects as very low based on the lowest certainty in the evidence for the critical outcomes, downgrading for study limitations and imprecision. Pharmacological prophylaxis may not reduce symptomatic PEs (RR, 0.48; 95% CI, 0.26 to 0.88; low certainty in the evidence of effects), which corresponds to 0 fewer events in lower-risk patients and 0 fewer (0-1 fewer) events in higher-risk patients undergoing TURP. Pharmacological prophylaxis may increase major bleeding (RR, 1.24; 95% CI, 1.12-1.37; low certainty in the evidence of effects). We rated the overall certainty in the evidence of effects as very low based on the lowest certainty in the evidence for the critical outcomes, downgrading for study limitations, indirectness, and very serious imprecision. DVT has an annual incidence of about 1–2 per 1000 people. will be notified by email within five working days should your response be Common symptoms and signs of DVT are pain, swelling, erythema and dilated veins in the affected limb. We identified 6 systematic reviews addressing this question.25-28,31,32  We identified 11 studies in these reviews that fulfilled our inclusion criteria and measured outcomes relevant to this context.37,94-103  Our systematic search of RCTs did not identify any additional study that fulfilled the inclusion criteria. The panel was unable to assess the relative effect of pneumatic compression compared with that of graduated compression stockings on the risk of other hazards, such as falls or skin complications. For patients undergoing major general surgery, the ASH guideline panel suggests using pharmacological prophylaxis over no pharmacological prophylaxis (conditional recommendation based on low certainty in the evidence of effects ⊕⊕◯◯). A prospective, randomized study of compression alone, compression and aspirin, and compression and low-dose warfarin. For patients undergoing total hip arthroplasty or total knee arthroplasty, the ASH guideline panel suggests using aspirin (ASA) or anticoagulants (conditional recommendation based on very low certainty in the evidence of effects ⊕◯◯◯). On occasion, a strong recommendation is based on low or very low certainty in the evidence. A randomised, double-blind, non-inferiority trial, Oral dabigatran etexilate vs. subcutaneous enoxaparin for the prevention of venous thromboembolism after total knee replacement: the RE-MODEL randomized trial, Dabigatran etexilate versus enoxaparin for prevention of venous thromboembolism after total hip replacement: a randomised, double-blind, non-inferiority trial, Dabigatran versus enoxaparin in the prevention of venous thromboembolism after total knee arthroplasty: a randomized clinical trial, Oral, direct Factor Xa inhibition with BAY 59-7939 for the prevention of venous thromboembolism after total hip replacement, Dose-escalation study of rivaroxaban (BAY 59-7939)--an oral, direct factor Xa inhibitor--for the prevention of venous thromboembolism in patients undergoing total hip replacement, A once-daily, oral, direct factor Xa inhibitor, rivaroxaban (BAY 59-7939), for thromboprophylaxis after total hip replacement, Rivaroxaban versus enoxaparin for thromboprophylaxis after hip arthroplasty, Efficacy and safety of rivaroxaban in the prevention of deep vein thrombosis after hip arthroplasty, Effect of oral factor Xa inhibitor and low-molecular-weight heparin on surgical complications following total hip arthroplasty, Rivaroxaban versus enoxaparin for thromboprophylaxis after total knee arthroplasty, Comparative study between rivaroxaban and enoxaparin in deep venous thromboembolism prophylaxis in patients submitted to total hip arthroplasty, The PREVENT Trial – prevention of venous thromboembolism with enoxaparin vs rivaroxaban following hip and knee replacement surgeries, Different anticoagulant drugs during knee joint replacement: changes of hemorheology, The efficacy and safety of apixaban, an oral, direct factor Xa inhibitor, as thromboprophylaxis in patients following total knee replacement, Apixaban versus enoxaparin for thromboprophylaxis after hip replacement, Apixaban versus enoxaparin for thromboprophylaxis after knee replacement (ADVANCE-2): a randomised double-blind trial, Apixaban or enoxaparin for thromboprophylaxis after knee replacement, Darexaban (YM150) versus enoxaparin for the prevention of venous thromboembolism after total hip arthroplasty: a randomised phase IIb dose confirmation study (ONYX-3), A dose escalation study of YM150, an oral direct factor Xa inhibitor, in the prevention of venous thromboembolism in elective primary hip replacement surgery, Prevention of venous thromboembolism with an oral factor Xa inhibitor, YM150, after total hip arthroplasty. 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