Obesity, renal failure, HIT: which anticoagulant to use?
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1 Obesity, renal failure, HIT: which anticoagulant to use? Mark Crowther with thanks to Dr David Garcia and others. This Photo by Unknown Author is licensed under CC BY-SA 1
2 2
3 Drug choices The DOACs have changed the way that we deal with anticoagulants BUT the LMWHs, warfarin and other older anticoagulants still have an important role to play LMWHs remain the drugs of choice for VTE prophylaxis in many settings LMWHs at therapeutic doses provide flexibility in selected higher risk patients particularly at the extremes of weight The ability to monitor and adjust warfarin provide it with a great deal of flexibility Anticoagulation is a high-risk activity and thus we have to have a great deal of familiarity with agents before we use them 3
4 Obesity: Prophylaxis Prophylaxis with LMWH Soft evidence that as weight goes up, efficacy goes down, suggesting weight based adjustment may be required 4
5 198 patient RCT allocating patients to enoxaparin 40 mg BID or fondaparinux 5 mg OD Enoxaparin initiated pre-operatively Fondaparinux initiated post-operatively Clinical outcomes BMI 45.7 (Enox) vs 45.1 (Fonda) Screening detected DVT 2/2 MRV all clots in Left Iliac vein Symptomatic DVT 0/0 5
6 DOACs Limited data with clinically relevant outcomes 6
7 Conclusions For LMWH as weight rises dose increments should be considered Weight adjusted LMWH is particularly appealing For DOACs Limited data that available suggests that weight has limited impact on drug levels but at extremes may consider LMWH For warfarin weight should have no impact 7
8 Obesity: Therapeutic dosing LMWH Dose increment without capping is generally accepted Warfarin No influence of weight on effect DOACs Limited, but surprising, data 8
9 In conclusion in AF and VTE patients treated with DOACs or with warfarin patients with low body weight had a paradoxical increase in the risk of thromboembolism compared with non-low body weight patients. The subgroup of AF patients with a high bodyweight had a favorable thromboembolic outcome compared with AF patients with a non-high body weight. Limited data on the very large Analysis based on wide patient weight classes Obesity paradox is seen in other settings 9
10 Obesity summary Warfarin remains effective across the range of body weights For prophylaxis consider weight adjusting LWMH and use DOACs with care For therapy use uncapped LMWH and reasonable to use DOACs (where indicated) at weights up to (and perhaps beyond) 130 kg 10
11 Renal Failure 11
12 Why are we worried about renal insufficiency? Impaired renal clearance will lead to bioaccumulation and avoidable bleeding 12
13 Kidney dysfunction increases both risk for clotting and bleeding VTE + kidney dysfunction increases the incidence of both fatal PE and fatal bleeding Multivariate Analysis on the Risk of Developing Fatal PE Multivariate Analysis on the Risk of Developing Fatal Bleeding Variables Odds Ratio (95% CI) P-Value Symptomatic PE 17 (8.8-34) <0.001 Renal function <0.001 Variables Odds Ratio (95% CI) P-Value CrCl > 60 ml/min Reference - Immobility >4 d 3.3 ( ) CrCl ml/min 2.0 ( ) Cancer 2.7 ( ) CrCl <30 ml/min 5.2 ( ) <0.001 Renal function - Immobility >4 d 2.4 ( ) <0.001 CrCl > 60 ml/min Reference - Cancer 2.0 ( ) <0.001 CrCl ml/min 1.4 ( ) Initial therapy, UFH 1.9 ( ) <0.001 CrCl <30 ml/min 5.0 (2.0-12) <0.001 Inpatients 1.5 ( ) CrCl: creatinine clearance; CI: confidence interval; PE: pulmonary embolism; UFH: Unfractionated Heparin Monreal M, et al., Findings from the RIETE Registry. Am J Med. 2006;119:
14 Risk of Anticoagulant-associated Major Bleeding Increases with Lower GFR We have an assumption that heparin and warfarin are safe in patients with renal insufficiency We have learned the LMWH and DOACs are unsafe with renal failure BOTH OF THESE ASSUMPTIONS MAY BE INCORRECT ARISTOTLE
15 LMWH: Prophylaxis and therapy 15
16
17 PROTECT 3600 patient study comparing LMWH with UFH in critically ill patients Innovations: Large sample size High consent rate Head to head comparison Included patients with renal failure
18 Primary outcome: Proximal deep vein thrombosis
19 Prophylaxis Dalteparin Reduced clinical pulmonary embolism 24 vs 43 cases (p = 0.01) Was safely used in patients over the full range of renal function Including patients on dialysis Caused less HIT 5 vs 12 cases despite contamination Was administered once daily Did not increase bleeding Any bleeding: 244 vs 247 patients Renal failure and LMWH Dalteparin Does not bioaccumulate at prophylactic doses Enoxaparin Appears to bioaccumulate requiring dose reduction Both are effective for prevention of VTE across the full range of renal function
20 The CLOT Study post-hoc Analysis Methods 200 IU/kg dalteparin SC QD month 1, and 150 IU/kg SC QD months IU/kg dalteparin SC QD days 1 5 and VKA QD, until INR was CLOT patients divided by renal function at baseline. Renal impairment (CrCl <60 ml/min) was defined as moderate (CrCl 30 to <60 ml/ min) or severe (CRCL <30 ml/min). Primary efficacy outcome was the rate of VTE recurrence (ITT population) Primary safety outcomes included clinically overt bleeding (any and major) in the as-treated (AT) population
21 The CLOT Study post-hoc Analysis VTE and Bleeding Outcomes in Patients with RI (CrCl < 60 ml/min) Variable Treatment Events % p - value Hazard Ratio (ITT) VTE (n = 162) (AT) Any bleeding (n = 161) (AT) Major bleeding (n = 161) Dalteparin 2/ OAC 15/ Dalteparin 15/ OAC 21/ Dalteparin 7/ OAC 6/ Results were consistent with the overall CLOT study, for dalteparin vs. OAC: VTE: 27/336 (9%) vs. 53/336 (17%) respectively, p = Any bleeding: 47/338 (14%) and 64/335 (19%) respectively, p = 0.09 Major bleeding: 19/338 (6%) and 12/335 (4%) respectively, p = 0.27
22 Dalteparin compared with UFH in an unselected General Medical population Park et al. J Gen Intern Med Jul 25. Compared clinically significant bleeding in patients with GFR < 60 ml/min receiving therapeutic dose dalteparin to patients receiving therapeutic doses UFH Non-randomized retrospective cohort study. Outcomes: Major bleeding within 10 days of anticoagulation
23 23
24 LMWH: Renal failure Key results: Dalteparin treated patients were significantly less likely to experience a major bleed than patients treated with UFH (1.14% vs. 3.49%, p <0.001). Difference remained significant after adjustment In patients with CKD, treatment with therapeutic dose dalteparin was associated with lower rates of bleeding than treatment with UFH Limited data for enoxaparin but that that exists suggests safety with empiric dose reduction 24
25 DOACs 25
26 Special Populations in the Phase III Randomized Trials of DOACs Trial Name Study Year Dosing Total N ecrcl Dabigatran RECOVER I/II RE-LY VTE AF 2009/ bid 150/110 bid Rivaroxaban EINSTEIN-DVT EINSTEIN-PE ROCKET-AF DVT PE AF qd 20 qd 20 qd Apixaban AMPLIFY ARISTOTLE VTE AF bid 5 bid Edoxaban HOKUSAI ENGAGE-AF VTE AF qd 60/30 qd NB: Many of these trials included pre-specified dose adjustments for reduced renal function.
27 No evidence of difference in efficacy for Atrial Fibrillation or Venous Thrombosis Most studies excluded patients with ESRD 27
28 That is all well and good but what should we do We should do studies! 28
29 Apixaban with renal failure Canadian Package insert US Package insert ELIQUIS_PM_184464_16June2016_E_marketed.pdf Access 21 Sept Accessed 21 Sept
30 Rivaroxaban with renal failure 30
31 Renal Impairment, my opinion Moderate renal impairment (Cr Cl ml/ min): All Xa inhibitors are at least as safe as warfarin Apixaban safer? Check package insert for dose adjustments! Severe renal impairment (Cr Cl < 30 ml/min): Avoid all DOACs pending more data If a DOAC is chosen, get informed consent and consider monitoring for bioaccumulation Do not assume that warfarin is a safer and more effective alternative it may just be we are inured to its problems!
32 HIT Rules of the game Confirm diagnosis using objective testing Avoid all heparin-like anticoagulants Reverse warfarin if platelets less than 150 Ensure patients are aware of need to avoid heparins in future 32
33 Drugs available and indications Argatroban Renal failure, requiring therapeutic anticoagulation Bivalirudin Hepatic disease, requiring therapeutic anticoagulation Fondaparinux Has become agent of choice in many circumstances DOACs Emerging evidence 33
34 National, multicenter registry HIT objectively diagnosed Treated with argatroban, lepirudin, danaparoid or fondaparinux Outcome measures: thromboembolic events, amputations, recurrent/ persistent thrombocytopenia, skin lesions and bleeding 34
35 Argatroban Danaparoid Fondaparinux Exposures Arterial thromboembolism 2.2% 3.3% 0% Venous thromboembolism 6.5% 4.9% 0% Amputation 2.2% 1.6% 0% Skin necrosis 0% 3.3% 0% Bleeding 6.5% 6.6% 4.8% Deaths 10.9% 19.7% 0% Adapted from Schindewolf et al. 35
36 DOACs and HIT 36
37 22 adults with suspected or confirmed HIT rivaroxaban 15 mg bid until HIT assay available positive assay continued rivaroxaban 15 mg bid until platelet recovery then reduced to 20 mg daily until day HIT patient had new VTE 1 HIT patient required limb amputation despite platelet recovery Rivaroxaban appears to be effective for treating patients with confirmed HIT, although the small number of patients enrolled limits precision 37
38 HIT summary Fondaparinux is now, probably, the standard in those patients who are eligible for it Argatroban, Bivalirudin have important roles in subsets of patients DOACs will likely evolve into an important role, initially replacing warfarin s current role in HIT management 38
39 Three cases 36 year old woman attending for hip replacement surgery Weight 147 kg Recommend: Probably some for of weightadjusted LMWH If tinzaparin is available it has a weight adjusted dosing schedule If not suggest at least double the usual prophylaxis 39
40 A 72 year old male with a CrCl of 15 ml/min presents with new, objectively confirmed left leg DVT Treat with usual dose dalteparin for 5 to 7 days and transition to warfarin Admit for IV UFH transitioned to warfarin Probably the less safe of the two options Probably would not use a DOAC as very limited data for VTE in this setting 40
41 A 58 year old woman develops serologically proven HIT on POD6 CABG + mitral valve replacement Initial therapy Limited data, high risk of thrombosis with MVR IV argatroban, danaparoid, bivalirudin Would not transition to fondaparinux in setting of fresh MVR Long term Rx warfarin once platelets have normalized 41
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