- Open Access
A case-based approach to implementing guidelines for stroke prevention in patients with atrial fibrillation: balancing the risks and benefits
Thrombosis Journal volume 13, Article number: 29 (2015)
Atrial fibrillation (AF) puts patients at risk of complications, including stroke. Warfarin therapy has been the mainstay of antithrombotic treatment for reducing the risk of stroke in AF. However, warfarin has limitations that have motivated development of several novel oral anticoagulants (NOACs), including dabigatran, rivaroxaban, apixaban, and edoxaban. Clinical trials demonstrate that the NOACs offer efficacy and safety that are equivalent to, or better than, those of warfarin for reducing the risk of stroke in patients with nonvalvular AF. This review examines stroke risk reduction in patients with AF from the perspective of the clinician balancing the risks and benefits of treatment options, evaluates the most recent guidelines, and discusses 2 hypothetical patient cases to better illustrate how clinicians may apply available data in the clinical setting. We reviewed guidelines for the reduction of stroke risk in AF and data from clinical trials on the NOACs. Choosing antithrombotic treatment involves assessing the benefits of therapy versus its risks. Risk indexes, including CHADS2, CHA2DS2-VASc, and HAS-BLED can help determine how to treat patients with AF. Current guidelines suggest using these risk indexes to customize treatment to individual patients. Many current treatment guidelines also incorporate recommendations for the use of NOACs as an alternative to warfarin. As additional data emerge and guidelines are updated, these recommendations will likely evolve. In the interim, clinicians may consider published guidelines and clinical trial results on NOACs. Real-world experience will provide clinicians with additional insight into their treatment decisions.
Successful healthcare interventions improve patient outcomes and reduce costs associated with disease management. Guidelines provide a standardized, evidence-based approach to the diagnosis and treatment of disease, with a goal of optimizing health outcomes. When available, preventive measures to reduce the risk of disease complications are an important element of treatment. Atrial fibrillation (AF), which affected an estimated 5.2 million adults in the United States in 2010, is a disease state in which patients are at risk of complications, including stroke . AF is a highly prevalent cardiac arrhythmia that imparts a 2- to 7-times greater risk of embolic or transient stroke [2, 3]. AF-related stroke is more severe than stroke without AF, and is associated with greater disability and subsequent medical needs [4, 5]. The high AF-related morbidity is reflected in a substantial economic burden. For 2010, the projected incremental cost of AF in the United States ranged from $6.0 billion to $26.0 billion .
Antithrombotic therapy can reduce the risk of stroke in patients with AF [7–11]; however, many at-risk patients are untreated or undertreated [12–15]. Antithrombotic treatment for stroke risk reduction in patients with AF has traditionally focused on anticoagulation with a vitamin K antagonist (VKA), primarily warfarin . Warfarin is highly effective for reducing the risk of stroke. However, warfarin has a narrow therapeutic window and many patients have difficulty remaining within the therapeutic range. Under-anticoagulation may lead to stroke, whereas over-anticoagulation may result in bleeding. Warfarin can be challenging to use in the clinical setting due to dietary and drug interactions, and variability in dose response due to genetic and environmental factors . Warfarin necessitates regular monitoring and dose adjustments to enable individual patients to receive safe and effective treatment [13, 16]. Many physicians overestimate bleeding risk and underestimate the benefit of stroke prevention . Bleeding risk and concerns about bleeding risk, as well as other clinical features of warfarin, may lead clinicians to rule it out as a treatment option; hence, many patients remain untreated [18–20]. Until recently, aspirin was the only treatment alternative for patients unsuitable for VKA therapy. Although bleeding risk is lower and administration is simpler with aspirin, the efficacy of aspirin in stroke prevention is inferior to that of warfarin [8, 21]. Thus, the conventional treatment options of warfarin and aspirin have left a segment of the patient population untreated and/or undertreated and at increased risk of stroke .
The limitations of the traditional options for stroke prevention in patients with AF have motivated the development of several novel oral anticoagulants (NOACs). Recent clinical trials have found that the NOACs offer efficacy and safety equivalent to, or better than, those of warfarin for reducing the risk of stroke in patients with nonvalvular AF (NVAF) [23–26]. As more clinical experience is gained with the NOACs, changes in treatment paradigms and guidelines will undoubtedly ensue. This review examines stroke prevention in patients with AF from the perspective of the clinician trying to balance the risks and benefits of treatment options. Use of treatment guidelines and the application of findings from recent clinical trials will help facilitate high-quality and cost-effective medical care; however, effective care must be tailored to the individual patient. In addition to reviewing the most recent guidelines for stroke prevention in AF, we will discuss 2 hypothetical patient cases to better understand how clinicians may apply these measures and the available data in the clinical setting.
Stroke risk reduction in NVAF with NOACs
Several NOACs are available in the United States for reducing the risk of stroke in patients with NVAF, including the direct thrombin inhibitor dabigatran and the factor Xa inhibitors rivaroxaban, apixaban and edoxaban [26–30]. A brief summary of the results of key phase 3 clinical trials comparing the NOACs with either warfarin or aspirin for reducing the risk of stroke in NVAF is provided in Table 1 [23–26, 31, 32]. These results provide support for the integration of NOACs into treatment paradigms for stroke risk reduction in AF as potential first-line options.
Guidelines and quality measures for stroke risk reduction in AF
Several guidelines discuss stroke risk reduction in patients with AF (Table 2), including recommendations from the American College of Cardiology (ACC), the American College of Chest Physicians (ACCP), the American Heart Association (AHA), the American Stroke Association (ASA), the Heart Rhythm Society (HRS), the European Society of Cardiology (ESC), and the American Academy of Neurology (AAN) [7–11]. In general, treatment decisions are based on an assessment of the individual patient’s stroke risk, with a concurrent assessment of bleeding risk and other patient-related factors, such as his or her ability to adhere to monitoring requirements and personal preferences [7, 10]. However, specific recommendations vary as to how to assess these risks, when to treat with antithrombotic therapy, and which treatments to use.
The CHADS2 and CHA2DS2-VASc risk indexes predict the risk of stroke in patients with AF. Both the ACC/AHA/HRS guidelines and the ESC guidelines mention the ATRIA and HEMORR2 HAGES scores for bleeding risk, but acknowledge that the HAS-BLED risk index is most predictive of bleeding events. Together, these scoring systems can be used to evaluate an approach to treatment in patients with AF. The CHADS2 score is based on a patient’s history of Congestive heart failure (1 point), Hypertension (1 point), Age ≥75 years (1 point), Diabetes (1 point), and history of Stroke or transient ischemic attack (TIA, 2 points; Table 3) . Scores of 0, 1, or ≥2 indicate low, moderate, or high stroke risk, respectively [8, 34]. The CHADS2 risk scoring index has been thoroughly validated [33–35]; is simple, inexpensive, and broadly applicable; and most importantly, it allows identification of patients at low risk of stroke who may not receive significant benefit from anticoagulant therapy. However, the CHADS2 risk score has limitations, primarily that patients deemed at low risk with CHADS2 still have a stroke risk of 2.2 % per year, in addition, there is a lack of differentiation between stroke risk factors and risk factors that do not consistently predict stroke (i.e., congestive heart failure). As a result, some patients may be identified as moderate- rather than low-risk stroke candidates, or vice versa [33–35]. Also, in keeping the CHADS2 risk score simple, some common stroke risk factors are not included [35, 36].
The ACC/AHA/HRS and ESC advocate using the CHA2DS2-VASc score instead of the CHADS2 score to assess stroke risk. The ESC states that the CHA2DS2-VASc score more accurately identifies “truly low-risk” patients with AF who are not likely to benefit from oral anticoagulant therapy (Table 3) and, conversely, those patients who may benefit from anticoagulation because they are at risk for stroke or systemic thromboembolism . The CHA2DS2-VASc score has been shown to identify some patients considered low risk by CHADS2 (score of 0) to actually be at a moderate risk of stroke [37–39]. The CHA2DS2-VASc considers additional risk factors, including Vascular disease (1 point) and Sex category (1 score point for female sex), and heightens the risk rendered by older age, assigning 2 points rather than 1 (as with CHADS2) for age ≥75 years, as well as 1 point for the risk factor of age 65–74 years . With CHA2DS2-VASc, patients with scores of 0, 1, or ≥2 are considered to be at low, moderate, or high risk of stroke, respectively . In one study of the predictive value of risk classification schemes, when patients were categorized by CHA2DS2-VASc score, 0 % of low-risk patients, 0.6 % of moderate-risk patients, and 3 % of high-risk patients experienced a thromboembolic event. In contrast, when the same cohort of patients was classified according to the CHADS2 scoring system, 1.4 % of low-risk, 1.9 % of moderate-risk, and 3.1 % of high-risk patients experienced an event . Despite these potential advantages, the CHA2DS2-VASc score index lacks the extensive validation that CHADS2 has received, and studies have demonstrated a similar predictive ability for the 2 indexes [11, 34, 40].
The AAN guidelines explicitly acknowledge the discrepancies between the risk scoring systems, stating “although multiple risk stratification tools are available for estimating the absolute stroke risk of patients with NVAF, the absolute stroke risks estimated by these tools vary widely .” Rather than a score-based recommendation, the AAN acknowledges that determining when the benefit of reducing stroke risk will outweigh the harm of increased bleeding risk is difficult, and emphasizes the importance of patient preference and physician judgment under these circumstances .
Concurrent assessment of stroke and bleeding risk presents a clinical challenge, as many of the risk factors for stroke and bleeding overlap . Indeed, a subgroup analysis of the RE-LY trial demonstrated an increased risk for bleeding associated with higher CHADS2 scores in patients receiving oral anticoagulation . Among the bleeding risk scores available, HAS-BLED has been independently validated, and correlates well with intracranial hemorrhage risk (Table 4) [7, 42]. HAS-BLED includes the following risk factors: Hypertension, Abnormal renal/liver function, Stroke, Bleeding history or predisposition, Labile international normalized ratio (INR), Elderly (age ≥65 years), and Drugs (concomitant antiplatelet/nonsteroidal anti-inflammatory drug or alcohol) [7, 11]. While the ESC suggests using the HAS-BLED bleeding risk score , the ACC/AHA/HRS, ASA, and ACCP do not endorse a specific scoring system, but do advise that an assessment of bleeding risk is needed [8, 11, 41]. The ESC guidelines recommend caution along with efforts to correct potentially reversible bleeding risk factors when prescribing antithrombotic therapy for patients with a HAS-BLED score ≥3. Importantly, the ESC guidelines emphasize that: whereas the HAS-BLED score should be used to identify modifiable bleeding risks, a high HAS-BLED score alone should not exclude patients from oral anticoagulant treatment .
NOACs have been included in the most recent updates to guidelines for stroke prevention in patients with AF (Table 2) [7–11]. It should be noted that edoxaban has not been included in the guideline recommendations because it was not approved at the time of publication. The ESC recommends the NOACs over warfarin based on their better efficacy, safety, and convenience , whereas the AHA/ASA recommend the NOACs as an alternative to warfarin in the presence of at least 1 additional risk factor for stroke ; neither guideline recommends one NOAC over another. While the ACC/AHA/HRS recommend any of the 3 NOACs (i.e., dabigatran, rivaroxaban, or apixaban) as an efficacious alternative to warfarin , the ACCP guidelines recommend dabigatran 150 mg twice daily in place of adjusted-dose VKA . (The ACCP guidelines include dabigatran but not apixaban or rivaroxaban in their recommendations, as the latter 2 NOACs were not yet approved when the guidelines were drafted .) The ACCP guidelines favor oral anticoagulants over aspirin alone or, for patients at intermediate to high risk of stroke for whom warfarin is unsuitable, suggest aspirin given with clopidogrel; where oral anticoagulation is indicated, dabigatran is recommended over warfarin . The AAN guideline update offers recommendations for specific NOACs in lieu of or as an alternative to warfarin based on type of stroke risk (i.e., general risk [dabigatran 150 mg], high risk of cerebral or systemic embolism [SE] [rivaroxaban], moderate risk of embolism [apixaban 5 mg twice daily]) . Additionally, the AAN update recommends apixaban 5 mg bid over aspirin for reducing risk of stroke or SE , and the AAN guidelines include a recommendation for the addition of clopidogrel to aspirin as an alternative for patients with AF in whom warfarin is considered unsuitable . It should be noted that while the ACC, ACCP, AHA, ASA, HRS, and ESC use the CHADS2, CHA2DS2-VASc, and/or HAS-BLED risk scores to determine their treatment recommendations, these risk scoring systems are based on the results of trials during the era in which patients were receiving warfarin, aspirin, or placebo, and not the new NOACs [10, 43–45]. The study that validated the CHADS2 score measured stroke risk among patients who were not receiving any form of anticoagulant therapy .
Performance and quality measures from the Joint Commission, a US healthcare accrediting organization formerly known as the Joint Commission on Accreditation of Healthcare Organizations, and from the ACC/AHA also provide guidance on the treatment of patients with NVAF [46, 47]. Published in 2008, the Joint Commission’s Stroke Performance Implementation Guide recommends warfarin (unless contraindicated) for patients with AF-related stroke . ACC/AHA performance measures, also published in 2008, recommend antithrombotic therapy with aspirin or warfarin for patients with NVAF based on the patient’s stroke risk category .
More recently, the Stroke and Stroke Rehabilitation Work Group provided guidance in 2012 with quality measures to improve outcomes in stroke, TIA, and stroke rehabilitation. Composed of the AAN, American College of Radiology, National Committee for Quality Assurance, and the American Medical Association–convened Physician Consortium for Performance Improvement® (PCPI®), the Stroke and Stroke Rehabilitation Work Group advocates anticoagulant therapy with dabigatran, rivaroxaban, warfarin, or low-molecular-weight heparin at discharge for patients with AF .
Application of treatment guidelines to clinical practice
With multiple oral anticoagulants now available to reduce the risk of stroke in patients with NVAF, guidelines and treatment paradigms will continue to evolve to reflect findings from clinical trials and emerging clinical experience. The hypothetical cases that follow explore how clinicians might apply guidelines and clinical trial data to treatment decisions for the patient throughout the clinical course of NVAF.
Hypothetical patient case 1: Balancing the benefit of thromboprophylaxis with the risk of bleeding
BL is a 64-year-old white woman who presents to the emergency room with cellulitis of the left forearm that has not responded to outpatient antibiotic treatment. BL takes metoprolol for hypertension, but no other medications. She has no history of diabetes. She is a nonsmoker who exercises regularly and occasionally has a glass of wine with dinner. Physical examination reveals the following: body mass index (BMI), 22 kg/m2 (height, 5′7′′; weight, 139 lbs); blood pressure, 144/82 mm Hg; pulse, 78 bpm, irregular; temperature, 101 °F. On electrocardiogram (ECG), an irregularly irregular rhythm is noted with no ST-elevation and a normal axis. Apart from moderate cellulitis of the left forearm and associated signs of infection, no other abnormal findings are noted during the physical examination.
BL is admitted to the hospital and the cellulitis responds to intravenous antibiotics. She asks if her irregular heart rhythm will require additional treatment or a repeat of treatment she had taken for it previously. Upon further inquiry, her hospitalist notes that 2 years ago BL had been examined for complaints of breathlessness and a rapid heart rate. After a complete cardiac workup at that time, she had been diagnosed with paroxysmal NVAF and was prescribed warfarin. BL states she didn’t like the frequent blood tests that were associated with warfarin and often found it difficult to get to the anticoagulant clinic due to her work schedule. During a follow-up visit approximately 2 months after BL had started taking warfarin, her physician found that she was still in AF, although her heart rate had returned to normal, and although he recommended that she continue taking warfarin, she chose to stop it at that time.
Due to her history of hypertension, BL has a HAS-BLED score of 1, a CHADS2 score of 1, and a CHA2DS2-VASc score of 2. Her HAS-BLED score indicates a low risk of bleeding. Her CHADS2 score indicates a moderate risk of stroke, which is associated with a stroke rate of 2.8 % per year . In contrast, her CHA2DS2-VASc score places her in the high-risk category, although the rate of stroke associated with a CHA2DS2-VASc score of 2 is 2.2 % per year, similar to that associated with her CHADS2 score . Her moderate to high stroke risk (depending on the scoring system used) suggests the importance of stroke prevention in this patient.
Treatment guidelines provide various recommendations for patients with a CHADS2 score of 1 (or a CHA2DS2-VASc score of ≥2), ranging from daily aspirin to oral anticoagulation with warfarin or a NOAC (Table 2) [7–11]. In the present case, however, an effective treatment choice for BL must also consider her low risk of bleeding and her past noncompliance with warfarin therapy. Based on BL’s history of difficulty maintaining a therapeutic INR while on warfarin and adhering to monitoring requirements, warfarin would not be the ideal first choice for this patient. Instead, one of the NOACs may provide a safe, efficacious, and convenient alternative.
Consideration of pharmacologic properties and patient-specific characteristics, such as comorbidities, may help in the identification of a specific NOAC for stroke prevention (Table 5) [23–31, 49–58]. However, in this case, BL’s medical history and concomitant medication (metoprolol) do not rule out any of the NOACs. Given a CHADS2 score of 1, one might consider aspirin versus a NOAC. In contrast, her CHA2DS2-VASc score of 2 would suggest that an anticoagulant is a more appropriate choice. As noted previously, aspirin is less effective than warfarin in preventing stroke in patients with NVAF . Of the NOACs, only apixaban has been studied head-to-head versus aspirin (AVERROES trial) . The AVERROES trial demonstrated greater efficacy with apixaban in significantly reducing the risk of stroke and SE compared with aspirin (hazard ratio 0.45; 95 % confidence interval, 0.32, 0.62; p < 0.001; Table 1) . For example, the annual rate of stroke or SE was 1.6 % (51/2808) with apixaban versus 3.7 % (113/2791) with aspirin, with no significant difference between treatments in rates of major (p = 0.57), gastrointestinal (GI; p = 0.71), or intracranial (p = 0.69) bleeding . Based on the results of the AVERROES trial, and given the low risk of bleeding anticipated for BL based on her HAS-BLED score of 1, using an oral anticoagulant instead of aspirin on balance appears to be the better choice, considering that complications of stroke can be life-debilitating.
Hypothetical patient case 2: Identifying and managing stroke risk in the midst of comorbidities and a high risk of bleeding
AS is a 73-year-old black man with type 2 diabetes, hypertension, and persistent NVAF who presents to the emergency room with complaints of occasional palpitations, lightheadedness, and a productive cough. He takes metformin for diabetes, valsartan with chlorthalidone for hypertension, and a daily aspirin tablet for his AF. He is a nonsmoker and leads a generally sedentary lifestyle. On physical examination, AS has a BMI of 34 kg/m2 (height 5′10′′; weight, 237 lbs); blood pressure, 154/90 mm Hg; pulse, 100 bpm; and temperature, 102 °F. His lab and test results were consistent with a diagnosis of acute pneumonia.
AS is admitted to the hospital and treated for pneumonia. Past history reveals that he was diagnosed 2 years ago with AF and treated at that time with warfarin, which was stopped 1 year ago due to a GI bleed. Subsequently, he was put on an aspirin regimen of 75 mg per day. During the current visit AS expresses concern to the hospitalist about his persistent AF, diabetes, and high blood pressure, all of which increase his risk of stroke. He says he wants to resume oral anticoagulant treatment, which he thinks may be better for him than aspirin.
This patient’s age and history of hypertension and diabetes give him a CHADS2 score of 2 (and CHA2DS2-VASc score of 3), which indicates an increased risk of stroke and is associated with a stroke rate of 4.0 % per year based on his CHADS2 score, or 3.2 % per year based on his CHA2DS2-VASc score [10, 33]. His age (≥65 years), past history of GI bleeding, and hypertension add up to a HAS-BLED score of 3, which is linked to an increased risk of bleeding, and data show it to be associated with a bleeding rate of 3.74 % per year . The high risk of both stroke and bleeding call for immediate stroke prevention. Guideline recommendations for patients with a CHADS2 score of 2 (or a CHA2DS2-VASc score ≥2) include oral anticoagulation with warfarin or a NOAC (Table 2) [7, 8, 10, 11]. AS has a history of GI bleeding with warfarin, and has several characteristics associated with poor INR control including his age, non-white race, and diabetes [59–61]. A NOAC may provide a safer alternative to warfarin. However, in the RE-LY and ROCKET-AF trials, dabigatran and rivaroxaban, respectively, were associated with similar rates of major bleeding and increased rates of GI bleeding versus warfarin [23, 25]. In the RE-LY trial, the rates of major bleeding for dabigatran 110 mg and 150 mg bid were 2.71 % per year (p = 0.003) and 3.11 % per year (p = 0.31), respectively, compared with 3.36 % per year with warfarin . Rates of GI bleeding with dabigatran 110 mg and 150 mg versus warfarin were 1.12 % per year (p = 0.43) and 1.50 % per year (p < 0.001) versus 1.02 % per year, respectively . Multiple GI bleeding events with dabigatran have also been reported in recent postmarketing surveillance . In the ROCKET-AF trial, the rates of major bleeding were 3.6 % per year and 3.4 % per year for rivaroxaban and warfarin, respectively (p = 0.58), and GI bleeding occurred in 3.2 % of patients with rivaroxaban versus 2.2 % of patients with warfarin (p < 0.001) . In the ARISTOTLE trial comparing apixaban with warfarin, apixaban demonstrated a 31 % reduction in major bleeding and no increased risk of GI bleeding compared with warfarin . Non-bleeding GI adverse events (AEs) were more common with dabigatran than with rivaroxaban in the RE-LY and ROCKET-AF trials, respectively, versus warfarin (16.9 % vs. 9.4 %; 5.33 % vs. 5.57 %, respectively) [25, 63]. In the RE-LY trial, dyspepsia was the most common AE among patients receiving dabigatran, occurring significantly more often with either dose of dabigatran than with warfarin (p < 0.001 for both doses) . An analysis of data from the RE-LY trial found that non-bleeding upper GI AEs were generally mild or moderate with dabigatran and warfarin . However, patients receiving dabigatran compared with warfarin were more likely to discontinue the study drug due to non-bleeding upper GI AEs or dyspepsia-like symptoms (4.0 % vs. 1.7 %; p < 0.001, respectively) . Similar findings were not observed for apixaban or rivaroxaban in the ARISTOTLE and ROCKET-AF trials, respectively [24, 25]. In the ROCKET-AF trial, the only difference in incidence of AEs between treatment groups was epistaxis, which occurred more frequently in patients receiving rivaroxaban than patients receiving warfarin (10.14 % vs. 8.55 %, p < 0.05) . In the ARISTOTLE trial, the incidence of AEs was similar in the treatment groups .
AS’s comorbidities and concomitant medications should also be considered when selecting a NOAC. Having diabetes places AS at increased risk of bleeding when taking oral anticoagulants, and also poses the possibility of renal impairment [28, 64, 65]. Of the 3 NOACs, apixaban has the least renal elimination (~27 %) compared with rivaroxaban (~36 %) and dabigatran (~80 %), and is also eliminated via biliary and possibly direct intestinal excretion (Table 5) [27–29, 64–71]. Apixaban also demonstrated superiority over warfarin in reducing risk of stroke/SE, major bleeding, and mortality, irrespective of renal function . Apixaban 5 mg twice daily may be a good NOAC option for this patient who is at high risk of bleeding and with comorbidities [7, 8, 10].
Discussion and conclusions
Conventional treatment options for reducing the risk of stroke in patients with NVAF, including VKAs and aspirin, have limitations that currently leave many patients undertreated or untreated, and thus, suboptimally protected from stroke. The NOACs provide an additional treatment pathway that may help address this trend by offering treatment options with equivalent or improved efficacy and safety compared with warfarin. Current treatment guidelines have begun to incorporate recommendations for use of the available NOACs, and as additional data emerge and guidelines are further updated, these recommendations will likely evolve. In the interim, clinicians may need to consider the recommendations of published guidelines while also weighing results of clinical trials on NOACs. Furthermore, real-world experience will provide clinicians with additional insight into their treatment decisions. The challenge, however, will be for clinicians to assess the benefits and risks of treatment within the framework of the individual characteristics that define each patient case scenario. Use of scoring systems to assess stroke and bleeding risk; consideration of patient characteristics such as concomitant medications, age, and renal failure; and an understanding of relevant pharmacologic characteristics of the NOACs will all assist in these treatment decisions (Table 5).
When comparing the results of clinical trials of each NOAC versus warfarin, subtle differences in clinical outcomes become evident, such as rates of stroke, SE, all-cause mortality, major bleeding, and intracranial hemorrhage. For example, compared with warfarin, dabigatran 150 mg provided greater risk reduction for stroke and SE in the RE-LY trial than did apixaban, rivaroxaban, or edoxaban in the ARISTOTLE, ROCKET-AF, and ENGAGE AF-TIMI 48 trials, respectively (Table 1) [23–28]. However, edoxaban and apixaban had a greater risk reduction for major bleeding versus warfarin than did dabigatran, as well as greater risk reduction for stroke and SE versus warfarin than did rivaroxaban. Apixaban and dabigatran 150 mg had a similar risk reduction for intracranial hemorrhage, but less than edoxaban 30 mg and dabigatran 110 mg and more than rivaroxaban. Rivaroxaban, apixaban, dabigatran 150 mg, and edoxaban provided comparable risk reduction versus warfarin for all-cause mortality [23–28]. Three formal indirect comparisons of the ARISTOTLE, RE-LY, and ROCKET-AF trials confirm these observations with regard to rivaroxaban, apixaban, and dabigatran [73–75]. One study quantified the benefits and risks of the NOACs with the following odds ratios (ORs) for stroke or SE: rivaroxaban versus dabigatran 150 mg, OR, 1.35 (p = 0.04); rivaroxaban versus dabigatran 110 mg, OR, 0.97 (p = 0.81); apixaban versus dabigatran 150 mg, OR, 1.22 (p = 0.18); apixaban versus dabigatran 110 mg, OR, 0.88 (p = 0.34); apixaban versus rivaroxaban, OR, 0.90 (p = 0.43). For major bleeding, the estimated ORs were: rivaroxaban versus dabigatran 150 mg, OR, 1.10 (p = 0.36); rivaroxaban versus dabigatran 110 mg, OR, 1.28 (p = 0.02); apixaban versus dabigatran 150 mg, OR, 0.74 (p = 0.004); apixaban versus dabigatran 110 mg, OR, 0.87 (p = 0.17); apixaban versus rivaroxaban, OR, 0.68 (p < 0.001) . Indirect comparisons like these must be considered with caution because of differences in trial design and patient populations.
With the availability of the NOACs, success in reducing the risk of stroke among patients with NVAF no longer has to pivot on the suitability of warfarin for patients. Until treatment guidelines are updated to incorporate all available data on the NOACs, clinicians would be well advised to consider recent clinical trial data for these agents alongside current treatment guidelines for stroke prevention in AF. Such attentiveness may help render treatment decisions that accurately address the constellation of characteristics composing each individual case and result in safe, high-quality, and cost-effective patient care.
American College of Cardiology
American College of Chest Physicians
American Heart Association
American Academy of Neurology
American Stroke Association
Body mass index
European Society of Cardiology
Heart Rhythm Society
Novel oral anticoagulants
- PCPI® :
Physician Consortium for Performance Improvement®
Transient ischemic attack
Vitamin K antagonist
Colilla S, Crow A, Simon T, Singer DE, Petkun W, Liu X. Projected estimates of prevalence and annual growth rate of atrial fibrillation in the United States from a dynamic age-period progression model. Circ Cardiovasc Qual Outcomes. 2012;5:A2056.
Fuster V, Ryden LE, Cannom DS, Crijns H, Curtis AB, Ellenbogen KA, et al. ACC/AHA/ESC 2006 Guidelines for the Management of Patients with Atrial Fibrillation: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines and the European Society of Cardiology Committee for Practice Guidelines (Writing Committee to Revise the 2001 Guidelines for the Management of Patients With Atrial Fibrillation): developed in collaboration with the European Heart Rhythm Association and the Heart Rhythm Society. Circulation. 2006;114:e257–354.
Wolf PA, Abbott RD, Kannel WB. Atrial fibrillation as an independent risk factor for stroke: the Framingham Study. Stroke. 1991;22:983–8.
Dulli DA, Stanko H, Levine RL. Atrial fibrillation is associated with severe acute ischemic stroke. Neuroepidemiology. 2003;22:118–23.
Hannon N, Sheehan O, Kelly L, Marnane M, Merwick A, Moore A, et al. Stroke associated with atrial fibrillation–incidence and early outcomes in the north Dublin population stroke study. Cerebrovasc Dis. 2010;29:43–9.
Kim MH, Johnston SS, Chu BC, Dalal MR, Schulman KL. Estimation of total incremental health care costs in patients with atrial fibrillation in the United States. Circ Cardiovasc Qual Outcomes. 2011;4:313–20.
Camm AJ, Lip GY, De Caterina R, Savelieva I, Atar D, Hohnloser SH, et al. 2012 focused update of the ESC Guidelines for the management of atrial fibrillation: An update of the 2010 ESC Guidelines for the management of atrial fibrillation. Developed with the special contribution of the European Heart Rhythm Association. Eur Heart J. 2012;33:2719–47.
Furie KL, Goldstein LB, Albers GW, Khatri P, Neyens R, Mintu P, et al. Oral antithrombotic agents for the prevention of stroke in nonvalvular atrial fibrillation: a science advisory for healthcare professionals from the American Heart Association/American Stroke Association. Stroke. 2012;43:3442–53.
Culebras A, Messe SR, Chaturvedi S, Kase CS, Gronseth G. Summary of evidence-based guideline update: prevention of stroke in nonvalvular atrial fibrillation: report of the Guideline Development Subcommittee of the American Academy of Neurology. Neurology. 2014;82:716–24.
January CT, Wann LS, Alpert JS, Calkins H, Cleveland JC Jr, Cigarroa JE, et al. 2014 AHA/ACC/HRS Guideline for the Management of Patients With Atrial Fibrillation: Executive Summary: A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines and the Heart Rhythm Society. J Am Coll Cardiol. 2014;S0735-1097(14)01739-2. doi: 10.1016/j.jacc.2014.03.021.
You JJ, Singer DE, Howard PA, Lane DA, Eckman MH, Fang MC, et al. Antithrombotic therapy for atrial fibrillation: Antithrombotic Therapy and Prevention of Thrombosis, 9th ed: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines. Chest. 2012;141(2 Suppl):e531S–75.
Anderson N, Fuller R, Dudley N. ‘Rules of thumb’ or reflective practice? Understanding senior physicians’ decision-making about anti-thrombotic usage in atrial fibrillation. QJM. 2007;100:263–9.
Ansell J, Hirsh J, Hylek E, Jacobson A, Crowther M, Palareti G. Pharmacology and management of the vitamin K antagonists: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines (8th Edition). Chest. 2008;133(6 Suppl):160–198S.
Baker WL, Cios DA, Sander SD, Coleman CI. Meta-analysis to assess the quality of warfarin control in atrial fibrillation patients in the United States. J Manag Care Pharm. 2009;15:244–52.
Hankey GJ, Eikelboom JW. Antithrombotic drugs for patients with ischaemic stroke and transient ischaemic attack to prevent recurrent major vascular events. Lancet Neurol. 2010;9:273–84.
Stroke Prevention in Atrial Fibrillation Investigators. Stroke Prevention in Atrial Fibrillation Study. Final results. Circulation. 1991;84:527–39.
Suarez J, Piccini JP, Liang L, Atherton JJ, Hayward CS, Krum H, et al. International variation in use of oral anticoagulation among heart failure patients with atrial fibrillation. Am Heart J. 2012;163:804–11.
Gattellari M, Worthington J, Zwar N, Middleton S. Barriers to the use of anticoagulation for nonvalvular atrial fibrillation: a representative survey of Australian family physicians. Stroke. 2008;39:227–30.
Hylek EM, D’Antonio J, Evans-Molina C, Shea C, Henault LE, Regan S. Translating the results of randomized trials into clinical practice: the challenge of warfarin candidacy among hospitalized elderly patients with atrial fibrillation. Stroke. 2006;37:1075–80.
Partington SL, Abid S, Teo K, Oczkowski W, O’Donnell MJ. Pre-admission warfarin use in patients with acute ischemic stroke and atrial fibrillation: the appropriate use and barriers to oral anticoagulant therapy. Thromb Res. 2007;120:663–9.
Hart RG, Pearce LA, Aguilar MI. Meta-analysis: antithrombotic therapy to prevent stroke in patients who have nonvalvular atrial fibrillation. Ann Intern Med. 2007;146:857–67.
Fuster V, Ryden LE, Cannom DS, Crijns HJ, Curtis AB, Ellenbogen KA, et al. 2011 ACCF/AHA/HRS focused updates incorporated into the ACC/AHA/ESC 2006 guidelines for the management of patients with atrial fibrillation: a report of the American College of Cardiology Foundation/American Heart Association Task Force on practice guidelines. Circulation. 2011;123:e269–367.
Connolly SJ, Ezekowitz MD, Yusuf S, Eikelboom J, Oldgren J, Parekh A, et al. Dabigatran versus warfarin in patients with atrial fibrillation. N Engl J Med. 2009;361:1139–51.
Granger CB, Alexander JH, McMurray JJ, Lopes RD, Hylek EM, Hanna M, et al. Apixaban versus warfarin in patients with atrial fibrillation. N Engl J Med. 2011;365:981–92.
Patel MR, Mahaffey KW, Garg J, Singer DE, Hacke W, Breithardt G, et al. Rivaroxaban versus warfarin in nonvalvular atrial fibrillation. N Engl J Med. 2011;365:883–91.
Giugliano RP, Ruff CT, Braunwald E, Murphy SA, Wiviott SD, Halperin JL, et al. Edoxaban versus warfarin in patients with atrial fibrillation. N Engl J Med. 2013;369:2093–104.
Daiichi Sankyo Co., ltd. Savaysa® (edoxaban tablets). Prescribing information. http://dsi.com/prescribing-information-portlet/getPIContent?productName=Savaysa&inline=true. 2015. Accessed 02 June 2015.
Boehringer Ingelheim. Pradaxa dabigatran etexilate capsules. Prescribing information. http://bidocs.boehringer-ingelheim.com/BIWebAccess/ViewServlet.ser?docBase=renetnt&folderPath=/Prescribing%20Information/PIs/Pradaxa/Pradaxa.pdf . 2013. Ridgefield, CT, USA, Boehringer Ingelheim. 18-9-2013. Accessed 23 Sept 2014.
Bristol-Myers Squibb. Eliquis® (apixaban tablets). Prescribing information. http://packageinserts.bms.com/pi/pi_eliquis.pdf . 2014. FDA. 20-3-2014. Accessed 23 Sept 2014.
Janssen Pharmaceuticals I. Xarelto® (rivaroxaban tablets). Prescribing information. http://www.xareltohcp.com/sites/default/files/pdf/xarelto_0.pdf#zoom=100 . 2013. 13342 Berlin, Germany. 8-10-2013. Accessed 23 Sept 2014.
Connolly SJ, Ezekowitz MD, Yusuf S, Reilly PA, Wallentin L. Newly identified events in the RE-LY trial. N Engl J Med. 2010;363:1875–6.
Connolly SJ, Eikelboom J, Joyner C, Diener HC, Hart R, Golitsyn S, et al. Apixaban in patients with atrial fibrillation. N Engl J Med. 2011;364:806–17.
Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ. Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation. JAMA. 2001;285:2864–70.
Lip GY, Nieuwlaat R, Pisters R, Lane DA, Crijns HJ. Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation using a novel risk factor-based approach: the Euro Heart Survey on Atrial Fibrillation. Chest. 2010;137:263–72.
Baruch L, Gage BF, Horrow J, Juul-Möller S, Labovitz A, Persson M, et al. Can patients at elevated risk of stroke treated with anticoagulants be further risk stratified? Stroke. 2007;38:2459–63.
Go AS, Hylek EM, Chang Y, Phillips KA, Henault LE, Capra AM, et al. Anticoagulation therapy for stroke prevention in atrial fibrillation: how well do randomized trials translate into clinical practice? JAMA. 2003;290:2685–92.
Chen JY, Zhang AD, Lu HY, Guo J, Wang FF, Li ZC. CHADS2 versus CHA2DS2-VASc score in assessing the stroke and thromboembolism risk stratification in patients with atrial fibrillation: a systematic review and meta-analysis. J Geriatr Cardiol. 2013;10:258–66.
Coppens M, Eikelboom JW, Hart RG, Yusuf S, Lip GY, Dorian P, et al. The CHA2DS2-VASc score identifies those patients with atrial fibrillation and a CHADS2 score of 1 who are unlikely to benefit from oral anticoagulant therapy. Eur Heart J. 2013;34:170–6.
Olesen JB, Torp-Pedersen C, Hansen ML, Lip GY. The value of the CHA2DS2-VASc score for refining stroke risk stratification in patients with atrial fibrillation with a CHADS2 score 0–1: a nationwide cohort study. Thromb Haemost. 2012;107:1172–9.
Lip GY, Frison L, Halperin JL, Lane DA. Identifying patients at high risk for stroke despite anticoagulation: a comparison of contemporary stroke risk stratification schemes in an anticoagulated atrial fibrillation cohort. Stroke. 2010;41:2731–8.
Oldgren J, Alings M, Darius H, Eikelboom J, Ezekowitz MD, Kamensky G, et al. RE-LY Investigators. Risks for stroke, bleeding, and death in patients with atrial fibrillation receiving dabigatran or warfarin in relation to the CHADS2 score: a subgroup analysis of the RE-LY trial. Ann Intern Med. 2011;155:660–7. doi:10.7326/0003-4819-155-10-201111150-00004.
Pisters R, Lane DA, Nieuwlaat R, de Vos CB, Crijns HJ, Lip GY. A novel user-friendly score (HAS-BLED) to assess 1-year risk of major bleeding in patients with atrial fibrillation: the Euro Heart Survey. Chest. 2010;138:1093–100.
Stroke Prevention in Atrial Fibrillation Investigators. Predictors of thromboembolism in atrial fibrillation: I. Clinical features of patients at risk. Ann Intern Med. 1992;116:1–5.
SPAF III Writing Committee for the Stroke Prevention in Atrial Fibrillation Investigators. Patients with nonvalvular atrial fibrillation at low risk of stroke during treatment with aspirin: Stroke Prevention in Atrial Fibrillation III Study. JAMA. 1998;279:1273–7.
Atrial Fibrillation Investigators. Risk factors for stroke and efficacy of antithrombotic therapy in atrial fibrillation. Analysis of pooled data from five randomized controlled trials. Arch Intern Med. 1994;154:1449–57.
Estes III NA, Halperin JL, Calkins H, Ezekowitz MD, Gitman P, Go AS, et al. ACC/AHA/Physician Consortium 2008 Clinical Performance Measures for Adults with Nonvalvular Atrial Fibrillation or Atrial Flutter: a report of the American College of Cardiology/American Heart Association Task Force on Performance Measures and the Physician Consortium for Performance Improvement (Writing Committee to Develop Clinical Performance Measures for Atrial Fibrillation) Developed in Collaboration with the Heart Rhythm Society. J Am Coll Cardiol. 2008;51:865–84.
The Joint Commission. Disease-Specific Care: STROKE Performance Measurement Implementation Guide, 2nd Edition, Version 2.a. http://www.jointcommission.org/about_us/about_the_joint_commission _main.aspx . 2008. 22-11-2012. Accessed 23 Sept 2014.
Stroke and Stroke Rehabilitation Work Group. Stroke and Stroke Rehabilitation Performance Measurement Set. https://www.aan.com/uploadedFiles/3Practice_Management/2Quality_Improvement/1Quality_Measures/1All_Measures/2012%20Stroke%20and%20Stroke%20Rehab%20Measurements.pdf. 2012. 12-11-2012. Accessed 23 Sept 2014.
Crowther M, Kitt M, Lorenz T, Mathur V, Lu G, Hutchaleelaha A, et al. A phase 2 randomized, double-blind, placebo-controlled trial of PRT064445, a novel, universal antidote for direct and indirect factor Xa inhibitors [abstract]. J Thromb Haemost. 2013;11(s2):30.
Eerenberg ES, Kamphuisen PW, Sijpkens MK, Meijers JC, Buller HR, Levi M. Reversal of rivaroxaban and dabigatran by prothrombin complex concentrate: a randomized, placebo-controlled, crossover study in healthy subjects. Circulation. 2011;124:1573–9.
Escolar G, Arellano-Rodrigo E, Reverter JC, Villalta J, Sanz V, Molina P, et al. Reversal of apixaban induced alterations of hemostasis by different coagulation factor concentrates: studies in vitro with circulating human blood [Abstract]. Circulation. 2012;126:520–1.
Lu G, Deguzman FR, Karbarz MJ, Hollenbach SJ, Conley PB, Hutchaleelaha A, et al. Reversal of rivaroxaban mediated anticoagulation in animal models by a recombinant antidote protein (r-Antidote, PRT064445) [abstract]. Eur Heart J. 2011;32:640–1.
Perzborn E, Tinel H. FEIBA reverses the effects of a high dose of rivaroxaban in rats [abstract P061]. Pathophysiol Haemost Thromb. 2008;36:A40.
Stangier J, Rathgen K, Stahle H, Mazur D. Influence of renal impairment on the pharmacokinetics and pharmacodynamics of oral dabigatran etexilate: an open-label, parallel-group, single-centre study. Clin Pharmacokinet. 2010;49:259–68.
van Ryn J, Ruehl D, Priepke H, Hauel NH, Wienen W. Reversibility of the anticoagulant effect of high doses of the direct thrombin inhibitor dabigatran, by recombinant factor VIIa or activated prothrombin complex concentrate. Haematologica. 2008;93 Suppl 1:48.
Fukuda T, Honda Y, Kamisato C, Morishima Y, Shibano T. Reversal of anticoagulant effects of edoxaban, an oral, direct factor Xa inhibitor, with haemostatic agents. Thromb Haemost. 2012;107:253–9.
Ogata K, Mendell-Harary J, Tachibana M, Masumoto H, Oguma T, Kojima M, et al. Clinical safety, tolerability, pharmacokinetics, and pharmacodynamics of the novel factor Xa inhibitor edoxaban in healthy volunteers. J Clin Pharmacol. 2010;50:743–53.
Mendell J, Zahir H, Matsushima N, Noveck R, Lee F, Chen S, et al. Drug-drug interaction studies of cardiovascular drugs involving P-glycoprotein, an efflux transporter, on the pharmacokinetics of edoxaban, an oral factor Xa inhibitor. Am J Cardiovasc Drugs. 2013;13:331–42.
Bristol-Myers Squibb. Coumadin prescribing information. http://packageinserts.bms.com/pi/pi_coumadin.pdf . 2011. 11-10-2013. Accessed 23 Sept 2014.
Rose AJ, Hylek EM, Ozonoff A, Ash AS, Reisman JI, Berlowitz DR. Patient characteristics associated with oral anticoagulation control: results of the Veterans AffaiRs Study to Improve Anticoagulation (VARIA). J Thromb Haemost. 2010;8:2182–91.
Van Spall HG, Wallentin L, Yusuf S, Eikelboom JW, Nieuwlaat R, Yang S, et al. Variation in warfarin dose adjustment practice is responsible for differences in the quality of anticoagulation control between centers and countries: an analysis of patients receiving warfarin in the randomized evaluation of long-term anticoagulation therapy (RE-LY) trial. Circulation. 2012;126:2309–16.
Australian Government Department of Health. Therapeutic Goods Administration. Dabigatran (Pradaxa) and risk of bleeding: information for health professionals. http://www.tga.gov.au/safety/alerts-medicine-dabigatran-111005.htm. 23-5-2013. Accessed 23 Sept 2014.
Bytzer P, Connolly SJ, Yang S, Ezekowitz M, Formella S, Reilly PA, et al. Analysis of upper gastrointestinal adverse events among patients given dabigatran in the RE-LY trial. Clin Gastroenterol Hepatol. 2013;11:246–52.
Darius H, Clemens A, Healey JS, Avezum A, Nagarakanti R, Chin A, et al. Comparison of dabigatran versus warfarin in diabetic patients with atrial fibrillation: results from the RE-LY trial [abstract]. Circulation. 2012;126:A15937.
Goodman SG, Wojdyla DM, White HD, Piccini JP, Paolini JF, Nessel CC, et al. Predictors of major bleeding risk: insights from the rivaroxaban once-daily oral direct factor Xa inhibition compared with vitamin K antagonism for prevention of stroke and embolism trial in atrial fibrillation (ROCKET AF) [abstract]. Circulation. 2011;124:A16903.
Frost C, Yu Z, Nepal S, Bragat A, Moore K, Shenker A, et al. Apixaban, a direct factor Xa inhibitor: single-dose pharmacokinetics and pharmacodynamics of an intravenous formulation [abstract 148]. J Clin Pharmacol. 2008;48:1132.
Vakkalagadda B, Frost C, Wang J, Nepal S, Schuster A, Zhang D, et al. Effect of rifampin on the pharmacokinetics of apixaban, an oral direct inhibitor of factor Xa [abstract]. J Clin Pharmacol. 2009;49:1091–130.
Weinz C, Schwarz T, Kubitza D, Mueck W, Lang D. Metabolism and excretion of rivaroxaban, an oral, direct factor Xa inhibitor, in rats, dogs, and humans. Drug Metab Dispos. 2009;37:1056–64.
Blech S, Ebner T, Ludwig-Schwellinger E, Stangier J, Roth W. The metabolism and disposition of the oral direct thrombin inhibitor, dabigatran, in humans. Drug Metab Dispos. 2008;36:386–99.
Wang L, He K, Maxwell B, Grossman SJ, Tremaine LM, Humphreys WG, et al. Tissue distribution and elimination of [14C] apixaban in rats. Drug Metab Dispos. 2011;39:256–64.
Wang X, Mondal S, Wang J, Tirucherai G, Zhang D, Boyd RA, et al. Effect of activated charcoal on apixaban pharmacokinetics in healthy subjects. Am J Cardiovasc Drugs. 2014;14:147–54.
Hohnloser SH, Hijazi Z, Thomas L, Alexander JH, Amerena J, Hanna M, et al. Efficacy of apixaban when compared with warfarin in relation to renal function in patients with atrial fibrillation: insights from the ARISTOTLE trial. Eur Heart J. 2012;33:2821–30.
Lip GY, Larsen TB, Skjoth F, Rasmussen LH. Indirect comparisons of new oral anticoagulant drugs for efficacy and safety when used for stroke prevention in atrial fibrillation. J Am Coll Cardiol. 2012;60:738–46.
Mantha S, Ansell J. An indirect comparison of dabigatran, rivaroxaban and apixaban for atrial fibrillation. Thromb Haemost. 2012;108:476–84.
Testa L, Agnifili M, Latini RA, Mattioli R, Lanotte S, De Marco F, et al. Adjusted indirect comparison of new oral anticoagulants for stroke prevention in atrial fibrillation. QJM. 2012;105:949–57.
Laulicht B, Bakhru S, Lee C, Baker C, Jiang X, Mathiowitz E, et al. Small molecule antidote for anticoagulants [abstract]. Circulation. 2012;126:A11395.
Professional medical writing and editorial assistance was provided by Nicole Draghi, PhD, of Caudex, and funded by Bristol-Myers Squibb Company and Pfizer Inc.
AA reports research or speaking for Bristol-Myers Squibb/Pfizer, Johnson & Johnson, and Boehringer Ingelheim.
SD reports research, speaking, or consulting for Bristol-Myers Squibb/Pfizer, Johnson & Johnson, and Boehringer Ingelheim.
The authors did not receive any payment for working on this manuscript.
AA and SD made substantial contributions to the conception of the manuscript, revised the manuscript critically for important intellectual content, provided final approval of the version to be published, and agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. Both authors read and approved the final manuscript.
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Amin, A., Deitelzweig, S. A case-based approach to implementing guidelines for stroke prevention in patients with atrial fibrillation: balancing the risks and benefits. Thrombosis J 13, 29 (2015). https://doi.org/10.1186/s12959-015-0056-y
- Atrial fibrillation