1 Anticoagulation Strategies: How to Integrate the New Anticoagulants into Your Practice Virginia Association of Hematology & Oncology Spring Meeting April 18, 2015 B. Gail Macik, MD Professor of Medicine & Pathology
2 Disclosures I have no financial or active research interest with any of the companies making or distributing any of the products discussed. I did participate in the Extended Prophylaxis trial with apixaban ending 5yrs ago. I will be discussing off label use of rivaroxaban and apixaban for prevention of DVT in high risk individuals not on current anticoagulants
3 ANTICOAGULATION -BALANCE THE RISK Evidence-based guidelines outline what works for a population, take years to develop, need tweaking with age and accumulation of new data Doctors use guidelines to determine what works best for the patient, but guidelines lag behind current needs Treatment decisions require knowledge of evidence, patient specific risk assessment and patient acceptance and ability to follow recommendation ($$$) BLEED CLOT
4 THE IDEAL ANTICOAGULANT Oral, once daily fixed dose Rapid onset and offset of action Predictable pharmacokinetics (PK), and pharmacodynamics (PD) Low propensity for food and drug interactions No side effects or organ toxicities Wide therapeutic window No need for monitoring Rapidly reversible if bleeding
5 ANTICOAGULANTS Approved US DRUG PARENTERAL ORAL Vitamin K antagonist ( Inhibits II, VII, IX, X, & PC,PS) Indirect inhibitors of IIa and / or Xa (require ATIII) Warfarin All indications Warfarin All indications (grandfathered) Heparin All indications anti-iia = anti-xa (grandfathered) LMWHs varies by drug anti-xa > anti-iia activity Fondaparinux anti-xa only 1. Prevent DVT/PE hip/knee/abdominal surgery 2. Treatment acute DVT/PE NONE
6 ANTICOAGULANTS Approved US DRUG PARENTERAL ORAL Direct inhibitors Xa NONE RIVAROXABAN 1. Prevent DVT/PE - TKA/THA 2. Prevent stroke/embolism in nonvalve afib 3. Treatment of DVT/PE 4. Reduce risk recurrent DVT/PE APIXABAN 1. Prevent stroke/embolism in nonvalve afib 2. Prevent DVT/PE TKA/THA 3. Treatment of DVT/PE 4. Reduce risk recurrent DVT/PE
7 ANTICOAGULANTS Approved US DRUG PARENTERAL ORAL Direct inhibitors Xa (cont) EDOXABAN 1. Treatment of DVT/PE after 5-10 days of parenteral anticoagulant 2. Prevent stroke/embolism in nonvalvular afib Direct inhibitors IIa Argatroban Bivalirudin (Lepirudin discontinued) DABIGATRAN 1. Prevent stroke/emboli in nonvalvular afib 2. Treatment of DVT/PE after 5-7 days of parenteral anticoagulant 3. Reduce Risk of recurrent DVT/PE
8 New Anticoagulant Characteristics Apixaban Rivaroxaban Anti-Xa Anti-Xa T ½ hours 5-9 hours (9-13hr elderly) Elimination ~27% ~66 % unchanged & inactive metabolite Reversible NO NO Monitor anti-xa? anti-xa? Peak effect 3-4 hours 2-4 hours Absorbed Colon Stomach (with food)
9 New Anticoagulant Characteristics Edoxaban Dabigatran (anti-xa) (anti-iia) T ½ hours hours Elimination 50% ~80% Reversible NO NO Monitor anti-xa? ECT/dTT? Peak effect 1-2 hours 2 hours Absorbed Proximal Gut Proximal Gut
12 Absorption issues PHARMACOKINETICS Peak level occurs 1-2 hrs post dose. PRADAXA may be administered with or without food. The oral bioavailability of dabigatran INCREASES by 75% when the pellets are taken without the capsule shell. PRADAXA capsules SHOULD NOT BE BROKEN, CHEWED, OR OPENED BEFORE ADMINISTRATION. Capsules exposed to air only good for about 3 MONTHs,
13 PHARMACOKINETICS Elimination issues Renal clearance is 80%. The half-life of dabigatran in healthy subjects is 14 to 17 hours, > 24 hrs CrCl < 30 ml/min. FDA approved 75mg twice daily for creatinine clearance 15-30mL/min BASE ON ESTIMATE not clinical trial. Recommend avoid in elderly with CrCl < 30.
14 PRADAXA DRUG INTERACTIONS Work In Process ASK YOUR PHARMACIST Drugs to avoid (P-gp inducers) rifampin Drugs that DO NOT EFFECT DOSE (P-gp inhibitors) Ketoconazole Verapamil Amiodarone Quinidine Clarithromycin Results cannot be extrapolated to other P-gp inhibitors
15 MONITORING At therapeutic dose, dabigatran prolongs aptt, ECT (ecarin clot time), and TT (thrombin time). ONLY ECT SHOWS LINEAR EFFECT. Dilute TT may be helpful to assess effect of drug May be used to trend or determine some/none More specific assays in development but not ready for prime time. TAKE HOME MESSAGE Do NOT check PT or PTT Will Confuse not Help.
16 GASTROINTESTINAL ADVERSE REACTIONS PRADAXA has higher GI adverse events vs warfarin 21% of patients in trials stopped drug due to GI effects GI effects include abdominal / epigastric pain/discomfort, GERD, esophagitis, erosive gastritis, gastric hemorrhage, hemorrhagic gastritis, hemorrhagic erosive gastritis, and GI ulcer all reported Likely due to tartartic acid in capsule to aid absorption not endogenous stomach acid TAKE HOME PPI/antacid may or may not help, doubling dose increases cost
17 RE-COVER : Acute, symptomatic proximal DVT or PE (N = 2546) Dabigatran etexilate 150 mg twice daily vs. warfarin INR 2.0 to months Dabigatran is as effective as warfarin for prevention of recurrent VTE - Absolute difference 0.4%, 95% CI p<0.001 Dabigatran etexilate 150 mg twice daily (2.4%) Dose adjusted warfarin (2.1%) Bleeding: TREATMENT OF ACUTE VTE Risk of major bleeding was similar (HR 0.82, 95% CI 0.45 to 1.48) Dabigatran etexilate 150 mg twice daily (1.6% major, 16.1% any) Warfarin (60% TTR) (1.9% major, 21.9% any)
18 ReCOVER LIMITATIONS All patients received parenteral anticoagulation first; therefore, not studied as initial treatment 95% white race 90% had CrCl >50
19 Rivaroxaban(Xarelto): Oral Factor Xa Inhibitor
20 Overview of Characteristics Rapid onset of action 1 hr, peak 2-4 hrs Half life 5-9 hrs at steady state, longer in elderly Elimination: Renal(66%) Dose 20 mg/d CrCl > 50, 15mg/d CrCl 30-50, NOT recommended CrCl < 30 and contraindicated CrCl < 15 FOOD IMPROVES absorption (66vs76%) for 20mg Absorbed in stomach, should not be given by J-tube Bioavailability high % for 10mg dose, for 20 mg dose No dosage adjustment with mild liver impairment but not recommend for moderate / severe liver impairment
21 MONITORING May be monitored with anti-xa level BUT therapeutic range not established, cannot use heparin ranges PT and PTT prolong but not reliable for dose adjustment Therapeutic range or goal for PT PTT not published. TAKE HOME MESSAGE May be easier to monitor in kidney patients/weight extremes/ bleeding situation
22 XARELTO DRUG INTERACTIONS Drugs DECREASE effect (P-gp & CYP3A4 inducers) Carbamazepine Phenytoin Rifampin St John s wort Drugs that INCREASE effect (CYP3A4/P-gp inhibitors) May still use Clarithromycin/erythromycin Avoid - Ketoconazole/itraconazole, Ritonavir lopinavir/ritonavir indinavir/ritonavir, conivaptan IF CONCURRENT RENAL limit diltiazem, erythromycin/azithromycin, verapmil, quinidine, ranolazine, dronedarone, amiodarone, and felodipine
23 RIVAROXABAN VTE TREATMENT TRIALS Treatment of acute DVT (EINSTEIN DVT study) 15mg bid X 3wk, 20 mg daily vs enox-warfarin INR 2-3 Events: p<.001 for non inferiority of rivaroxaban Bleeding: 8.1% for both, p=.77 Treatment of acute PE (EINSTEIN PE Study) 15mg bid X 3wk, 20 mg daily vs enox-warfarin INR 2-3 Events: p<.003 for non inferiority of rivaroxaban Bleeding: 11.4% warfarin vs 10.3% rivaroxaban p=.23 Continued treatment DVT / PE (EINSTEIN-EXT) 20 mg daily for additional 6-12 months AFTER initial treat Events: 7.1% placebo vs 1.3% riva; Bleeding 0.7% p=.11
26 Overview of Apixaban Characteristics Bioavailability approximately 50% - not effected by food Maximum concentrations 3-4 hours after oral intake Prolonged absorption and short clearance half-life result in apparent half-life ~12 hr = twice a day dose Dual modes of elimination: feces and renal(27%), recent FDA approval for use in renal insufficient Absorbed distal small bowel/colon feeding tube OK Avoid in moderate-severe liver dysfunction
27 MONITORING May be monitored with anti-xa level BUT therapeutic range not published PT and PTT prolong but highly variable PT PTT should not be used to monitor TAKE HOME MESSAGE May be able to monitor ONLY with anti-xa assay
28 APIXABAN DRUG INTERACTIONS Drugs DECREASE effect (P-gp & CYP3A4 inducers) Carbamazepine Phenytoin Rifampin St John s wort Drugs that INCREASE effect (CYP3A4/P-gp inhibitors) Decrease dose to 2.5 mg twice daily Drugs include: Ketoconazole/itraconazole, Ritonavir lopinavir/ritonavir indinavir/ritonavir, clarithromycin IF already on 2.5mg dose, avoid co-administration with above drugs
29 APIXABAN Dosage Adjustments 1. For afib - The recommended dose of ELIQUIS is 2.5 mg twice daily in patients with any 2 of the following characteristics: age 80 years body weight 60 kg serum creatinine 1.5 mg/dl 2. For VTE No change to dose in renal failure 3. For afib/vte mild liver defect OK,?Mod, avoid in severe
30 TREATMENT OF ACUTE VTE 2 Phase III studies in DVT / PE AMPLIFY-EXT published NEJM December 8, 2012 AMPLIFY published NEJM June 30, 2013 For treatment of acute DVT/PE apixaban 10 mg bid X 7 days then 5 mg BID VS LMWH / warfarin; EXT vs placebo Apixaban superior to warfarin bleeding risk Warfarin 1.8% major bleeding Apixaban 0.6% major bleeding Apixaban non- inferior for prevention of recurrence Patients with CrCl 25 ml/min enrolled, no drug
31 APIXABAN ADVERSE EVENTS Bleeding most common but less than or equal to comparator Other reported side effects GI symptoms: nausea (3%), increase LFTs (<1%) Reported at < 1%: syncope, rash, anaphylaxis
33 D. V. Tea is a 52 yr old man newly diagnosed with DVT / PE after trip from New Zealand. He had stomach bypass 10 years ago. He has DM and creatinine clearance about 35. He was started on enoxaparin and warfarin.
34 I hate shots and Enoxaparin costs as much as my monthly mortgage. What choices do I have for anticoagulation. My sister is on a new anticoagulant for afib can I take the new pill?
35 Yes you are a candidate for a new pill. Pradaxa no, GERD, <CrCl Xarelto +/-, bypass, < CrCl Eliquis Yes Edoxaban -?? Not sure yet
36 D. V. Tea just called and he needs to have a colonoscopy. What should he do with his NOAC?
37 IS BRIDGING NECESSARY FOR PROCEDURES? The clinically effective life of NOAC are about the same as Lovenox. Why bridge to similar drug? Renal insufficiency will prolong clearance Lovenox/Pradaxa/Xarelto but not Eliquis Lovenox has advantage of reliable lab monitor NONE OF THESE DRUGS IS REVERSIBLE For Pradaxa hold 1-2 days CrCl > 50; 3-5 CrCl > 50 For Xarelto hold at least 24 hours For Eliquix High risk bleeding 48hr; low risk 24 hours Key: factor in surgical risk of bleeding, patient risk of clotting, renal function
38 D. V. Tea just called and he thinks he is bleeding and wants to know what to do?
39 TREATMENT OF BLEEDING ON NEW DRUGS Direct Thrombin Inhibitors - Dabigatran Not reversible (similar to LMWH) FFP/PCC do NOT reverse but may replace clotting factors consumed with bleeding or dilute drug PCC/rFVIIa do NOT reverse but cause a hypercoagulable state that may clot bleeding site at risk of unwanted thrombotic event Antifibrinolytics do NOT reverse but may slow clot break down and slow bleeding Dabigatran may be dialysed but inefficient, time consuming and requires line
40 TREATMENT OF BLEEDING ON NEW DRUGS Direct anti-xa Drugs Rivaroxaban and Abixaban are NOT reversible FFP/PCC/rFVIIa do NOT reverse but may have an effect on hemostasis as noted above Antifibrinolytics do NOT reverse but may stabilize clot at bleeding site Rivaroxaban and Apixaban are highly protein bound and unlikely to be dialyzable. Apixaban is less reliant on kidney for clearance, better choice in renal impaired. Apixaban shorter clinical effect than rivaroxaban.
41 Mr. Tea has been treated for 6 months now. He has a still swollen leg/partially occlusive clot on US, he is FVL heterozygous, and he is very afraid of another blood clot. Should he stop anticoagulation?
42 RISK OF RECURRENT VENOUS THROMBOEMBOLISM Kearon C, Akl EA, Comerota AJ, et al. Antithrombotic therapy for VTE disease: antithrombotic therapy and prevention of thrombosis, 9th ed: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines. Chest. 2012;141(2 suppl):e419s-e494s.
45 Extended Treatment to Reduce VTE risk Apixaban for Reduction of Risk of Recurrence 2.5 mg and 5 mg both significantly decreased risk 2.5 mg was similar to placebo for bleeding risk 2.5 mg twice a day for long term secondary prevention approved by FDA Rivaroxaban for Reduction of Risk of Recurrent VTE Simultaneously studied initial treatment and continued treatment with 20 mg once a day after first 3-14 mon of therapy Decreased risk of recurrent clot with < 1% risk of bleeding Continued therapy approved by FDA..
46 Mr. Tea is now 2 yrs out from his DVT and after a year he decided to stop anticoagulation as his first clot was provoked and his clot had almost completely resolved. Now he is going to New Zealand again. What should he do?
47 Prophylactic Anticoagulation at Times of Thrombotic Risk 2.5 mg twice a day Apixaban and 10 mg once a day Xarelto are both approved for prevention of DVT/PE with knee and hip surgery Travel, surgery, casting, immobility are risks for DVT, the magnitude of risk may not be as great as with orthopedic surgery For patient with thrombophilia +/- prior history VTE consider use of prophylactic anticoagulation at times of thrombotic risk for duration of the risk using dose extrapolated from orthopedic studies. This is not an approved indication
48 NOAC DVT/PE TREATMENT REFERENCES 1. HOKUSAI-Investigators. Edoxaban versus warfarin for the treatment of symptomatic venous thromboembolism. N Engl J Med 2013;Sept Agnelli G et al. Oral Apixaban for the Treatment of Acute Venous Thromboembolism. N Engl J Med 2013, 369: Agnelli G, et al. Apixaban for Extended Treatment of Venous Thromboembolism. N Engl J Med 2013; 368: The Einstein Investigators: Oral Rivaroxaban for symptomatic venous thromboembolism. New Engl J Med 2010;363: The Einstein Investigators: Oral Rivaroxaban for the treatment of symptomatic pulmonary embolism. New Engl J Med 2012;366: Schulman s et al. Dabigatran versus warfarin in the treatment of acute venous thromboembolism. N Engl J Med Dec 10;361(24): Schulman S, et al. Extended Use of Dabigatran, Warfarin, or Placebo in Venous Thromboembolism. N Engl J Med 2013; 368:
49 Tune in again for more - Cascade of Caveats - during the next COAG HOUR
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