Rate control is more cost-effective than rhythm control for patients with persistent atrial fibrillation ? results from the RAte Control versus Electrical cardioversion (RACE) study

Cost Effectiveness of Strategies to Manage Atrial Fibrillation in Middle- and High-Income Countries: A Systematic Review

BACKGROUND

Atrial fibrillation (AF) remains the most common form of cardiac arrhythmia. Management of AF aims to reduce the risk of stroke, heart failure and premature mortality via rate or rhythm control. This study aimed to review the literature on the cost effectiveness of treatment strategies to manage AF among adults living in low-, middle- and high-income countries.

METHODS

We searched MEDLINE (OvidSp), Embase, Web of Science, Cochrane Library, EconLit and Google Scholar for relevant studies between September 2022 and November 2022. The search strategy involved medical subject headings or related text words. Data management and selection was performed using EndNote library. The titles and abstracts were screened followed by eligibility assessment of full texts. Selection, assessment of the risk of bias within the studies, and data extraction were conducted by two independent reviewers. The cost-effectiveness results were synthesised narratively. The analysis was performed using Microsoft Excel 365. The incremental cost effectiveness ratio for each study was adjusted to 2021 USD values.

RESULTS

Fifty studies were included in the analysis after selection and risk of bias assessment. In high-income countries, apixaban was predominantly cost effective for stroke prevention in patients at low and moderate risk of stroke, while left atrial appendage closure (LAAC) was cost effective in patients at high risk of stroke. Propranolol was the cost-effective choice for rate control, while catheter ablation and the convergent procedure were cost-effective strategies in patients with paroxysmal and persistent AF, respectively. Among the anti-arrhythmic drugs, sotalol was the cost-effective strategy for rhythm control. In middle-income countries, apixaban was the cost-effective choice for stroke prevention in patients at low and moderate risk of stroke while high-dose edoxaban was cost effective in patients at high risk of stroke. Radiofrequency catheter ablation was the cost-effective option in rhythm control. No data were available for low-income countries.

CONCLUSION

This systematic review has shown that there are several cost-effective strategies to manage AF in different resource settings. However, the decision to use any strategy should be guided by objective clinical and economic evidence supported by sound clinical judgement.

REGISTRATION

CRD42022360590.

Epicardial adipose tissue, obesity and the occurrence of atrial fibrillation: an overview of pathophysiology and treatment methods

INTRODUCTION

Obesity is a chronic disease, which has significant health consequences and is a staggering burden to health care systems. Obesity can have harmful effects on the cardiovascular system, including heart failure, hypertension, coronary heart disease, and atrial fibrillation (AF). One of the possible substrates might be epicardial adipose tissue (EAT), which can be the link between AF and obesity. EAT is a fat deposit located between the myocardium and the visceral pericardium. Numerous studies have demonstrated that EAT plays a pivotal role in this relationship regarding atrial fibrillation.

AREAS COVERED

This review will focus on the role of obesity and the occurrence of atrial fibrillation (AF) and examine the connection between these and epicardial adipose tissue (EAT). The first part of this review will explain the pathophysiology of EAT and its association with the occurrence of AF. Secondly, we will review bariatric and metabolic surgery and its effects on EAT and AF.

EXPERT COMMENTARY

In this review, the epidemiology, pathophysiology, and treatments methods of AF are explained. Secondly the effects on EAT were elucidated. Due to the complex pathophysiological link between EAT, AF, and obesity, it is still uncertain which treatment strategy is superior.

Comparative occurrence of ischemic stroke with the rhythm versus rate control strategy in a national prospective cohort of atrial fibrillation

BACKGROUND/AIMS

Comparative occurrence of ischemic stroke for rhythm versus rate control strategy in patients with non-valvular atrial fibrillation (NVAF) is still inconclusive. The purpose of this study was to investigate whether the rhythm control strategy is associated with a lower risk of ischemic stroke compared to the rate control strategy in NVAF patients.

METHODS

The CODE-AF registry prospectively enrolled 6,280 consecutive patients who were treated for NVAF at 10 tertiary referral centers in South Korea. Of these, 2,513 NVAF patients (age, 67 ± 10 years; male, 61.8%) were clinically followed up for over 1-year and divided into rate and rhythm control groups.

RESULTS

Those treated with the rhythm control strategy were younger and had less proportions of underlying disease compared to those treated with the rate control strategy. After the propensity matching analysis, those treated with the rhythm control strategy had similar baseline characteristics including the CHA2DS2-VASC score compared to those treated with the rate control strategy. The rate of oral anticoagulation, all bleeding, and hospitalization were also similarly between the two groups. The incidence rate of ischemic stroke in the rhythm control group was significantly lower than in the rate control group (0.7 vs. 6.9 per 1,000 person-years, p = 0.011).

CONCLUSION

The rhythm control strategy demonstrated a beneficial effect to lower the risk of ischemic stroke during a 1-year follow-up compared to the rate control strategy.

Paradigm shifts in pathophysiology and management of atrial fibrillation-a tale of the RACE trials in the Netherlands

In the past 20 years the Netherlands-based RACE trials have investigated important concepts in clinical atrial fibrillation (AF). Their scope ranged from rhythm versus rate control to early or delayed cardioversion and also included early comprehensive management of AF in two trials, one focusing on early 'upstream therapy' and risk factor management and the other on integrated chronic nurse-led care. Studies were mostly triggered by simple clinical observations including futility of electrical cardioversion in persistent AF; many patients with permanent AF tolerating day-after-day 'uncontrolled' resting heart rates of up till 110 beats/min; patients being threatened more by vascular risks than AF itself; and insufficient guideline-based treatments for AF. Also the observation that recent-onset atrial fibrillation generally converts spontaneously, obviating cardioversion, triggered one of the studies. The RACE trials shifted a number of paradigms and by that could change the AF guidelines. The initial 'shock-and-forget' attitude made place for increased attention for anticoagulation, and in turn, broader vascular risks were recognised. In a nutshell, the adage eventually became: 'look beyond the ECG, treat the patient'.

Cost-Effectiveness of Rate- and Rhythm-Control Drugs for Treating Atrial Fibrillation in Korea

PURPOSE

Although the economic and mortality burden of atrial fibrillation (AF) is substantial, it remains unclear which treatment strategies for rate and rhythm control are most cost-effective. Consequently, economic factors can play an adjunctive role in guiding treatment selection.

MATERIALS AND METHODS

We built a Markov chain Monte Carlo model using the Korean Health Insurance Review & Assessment Service database. Drugs for rate control and rhythm control in AF were analyzed. Cost-effective therapies were selected using a cost-effectiveness ratio, calculated by net cost and quality-adjusted life years (QALY).

RESULTS

In the National Health Insurance Service data, 268149 patients with prevalent AF (age ≥18 years) were identified between January 1, 2013 and December 31, 2015. Among them, 212459 and 55690 patients were taking drugs for rate and rhythm control, respectively. Atenolol cost $714/QALY. Among the rate-control medications, the cost of propranolol was lowest at $487/QALY, while that of carvedilol was highest at $1363/QALY. Among the rhythm-control medications, the cost of pilsicainide was lowest at $638/QALY, while that of amiodarone was highest at $986/QALY. Flecainide and propafenone cost $834 and $830/QALY, respectively. The cost-effectiveness threshold of all drugs was lower than $30000/QALY. Compared with atenolol, the rate-control drugs propranolol, betaxolol, bevantolol, bisoprolol, diltiazem, and verapamil, as well as the rhythm-control drugs sotalol, pilsicainide, flecainide, propafenone, and dronedarone, showed better incremental cost-effectiveness ratios.

CONCLUSION

Propranolol and pilsicainide appear to be cost-effective in patients with AF in Korea assuming that drug usage or compliance is the same.

Mindfulness and Interoceptive Exposure Therapy for Anxiety Sensitivity in Atrial Fibrillation: A Pilot Study

Atrial fibrillation is the most common cardiac arrhythmia and symptoms overlap with physiological sensations of anxiety. Patients with atrial fibrillation can demonstrate anxiety sensitivity even in the absence of actual atrial fibrillation symptoms. Interoceptive exposure is effective in treating anxiety sensitivity, and recently, mindfulness has been proposed as an enhancement strategy to facilitating inhibitory learning in exposure therapy. This pragmatic study piloted a brief mindfulness and interoceptive exposure treatment for anxiety sensitivity in atrial fibrillation. Eight participants with atrial fibrillation and elevated anxiety sensitivity from a hospital cardiology department participated in the treatment. Anxiety sensitivity significantly decreased during the course of the intervention. These initial findings show proof of concept for this brief intervention in a cardiac-specific behavioral medicine setting.

Abdel-Daim M. Rhythm Versus Rate Control for Atrial Fibrillation: A Meta-analysis of Randomized Controlled Trials

Atrial fibrillation (AF) is a common, sustained tachyarrhythmia, associated with an increased risk of mortality and thromboembolic events. We performed this meta-analysis to compare the clinical efficacy of rate and rhythm control strategies in patients with AF in a meta-analysis framework. A comprehensive search of PubMed, OVID, Cochrane-CENTRAL, EMBASE, Scopus, and Web of Science was conducted, using relevant keywords. Dichotomous data on mortality and other clinical events were extracted and pooled as risk ratios (RRs), with their 95% confidence-interval (CI), using RevMan software (version 5.3). Twelve studies (8451 patients) were pooled in the final analysis. The overall effect-estimate did not favor rate or rhythm control strategies in terms of all-cause mortality (RR= 1.13, 95% CI [0.88, 1.45]), stroke (RR= 0.97, 95% CI [0.79, 1.20]), thromboembolism (RR= 1.06, 95% CI [0.64, 1.76]), and major bleeding (RR= 1.10, 95% CI [0.90, 1.35]) rates. These findings were consistent in AF patients with concomitant heart failure (HF). The rate of rehospitalization was significantly higher (RR= 0.72, 95% CI [0.57, 0.92]) in the rhythm control group, compared to the rate control group. In younger patients (<65 years), rhythm control was superior to rate control in terms of lowering the risk of all-cause mortality (p=0.0003), HF (p=0.003) and major bleeding (p=0.02). In older AF patients and those with concomitant HF, both rate and rhythm control strategies have similar rates of mortality and major clinical outcomes; therefore, choosing an appropriate strategy should consider individual variations, such as patient preferences, comorbidities, and treatment cost.

Which antiarrhythmic drug to choose after electrical cardioversion: A study on non-valvular atrial fibrillation patients

The relative efficacy of antiarrhythmic drugs (AADs) after electrical cardioversion are not well established. This study aimed to investigate the efficacies of different AADs for maintaining sinus rhythm (SR) after electrical cardioversion for atrial fibrillation (AF). We selected patients from a retrospective registry including patients admitted for cardioversion between January 2012 and June 2016. The primary outcome was time to AF recurrence during the first year after cardioversion. The secondary outcomes included AF recurrence within 1 month, and first readmission due to heart failure, stroke, or additional non-pharmacological rhythm control. A total of 265 patients were divided into the 4 groups according to AAD type: flecainide (n = 33), propafenone (n = 64), amiodarone (n = 128), and dronedarone (n = 40). During the first year after cardioversion, the AF recurrence-free survival was similar between all AAD groups (69.7% vs. 67.2% vs. 71.9% vs. 80.0%, p = 0.439). About half of all recurrences occurred during the first month. There was no difference in any of the secondary outcomes, although the amiodarone group showed a trend toward more non-pharmacological rhythm control. AAD type was not associated with recurrence in multivariate analysis. In this study, half of all patients received amiodarone after electrical cardioversion. Flecainide, propafenone, amiodarone, and dronedarone showed similar efficacies for maintaining SR after electrical cardioversion. Thus, it might be reasonable to reconsider amiodarone use after cardioversion, since it did not show superior efficacy to the other drugs considered and is associated with potential side effects.

Comparison of Rhythm and Rate Control Strategies for Stroke Occurrence in a Prospective Cohort of Atrial Fibrillation Patients

PURPOSE

Comparisons of rhythm and rate control strategies for stroke prevention in patients with atrial fibrillation (AF) are still inconclusive. We compared differences in clinical outcomes between the rhythm and rate control strategies.

MATERIALS AND METHODS

The COmparison study of Drugs for symptom control and complication prEvention of Atrial Fibrillation (CODE-AF) registry prospectively enrolled 6000 patients who were treated for AF using real-world guideline adherence at multiple referral centers. In total, 2508 (41.8%) patients were clinically followed up for over six months. Of these, 1134 (45.2 %) patients treated by rhythm control and 1374 (54.8 %) patients treated by rate control were analyzed for clinical outcomes, including stroke and cardiovascular outcomes.

RESULTS

Among all patients (age, 68±10 years; male, 62.4%), those treated with the rhythm control strategy were significantly younger, had more symptomatic paroxysmal AF, and a shorter AF duration, and were less likely to have diabetes, renal dysfunction, and heart failure, compared to those treated with the rate control strategy (CHA₂DS₂-VASc score 2.4±1.5 vs. 3.1±1.7, p<0.001). Even though oral anticoagulation was similarly prescribed in both groups, occurrence of stroke was less likely to occur in the rhythm control strategy group (0.0% vs. 0.7%, p=0.015). Multivariate Cox hazard regression showed that only age, especially more than 75 years old, were significantly correlated with the occurrence of stroke, regardless of the strategy used for treatment.

CONCLUSION

In this prospective AF cohort, compared with the rate control strategy, the rhythm control strategy was associated with fewer cardiovascular events and strokes in a short-term period.

Symptoms, acceptance of illness and health-related quality of life in patients with atrial fibrillation

Introduction:

Acceptance of illness plays a key role, allowing the patient to adapt to the disease and its treatment, and to maintain their health-related quality of life (HRQOL) despite chronic conditions.

Aim:

The aim of the study was to assess the relationship between severity of arrhythmia symptoms, acceptance of illness and HRQOL in patients with atrial fibrillation.

Methods:

The study included 99 patients (mean age 64.6) treated for atrial fibrillation. Three standardized instruments were used: the World Health Organization Quality of Life (WHOQoL-BREF) questionnaire, the Arrhythmia-Specific Questionnaire in Tachycardia and Arrhythmia (ASTA) and the Acceptance of Illness Scale (AIS).

Results:

Patients with high illness acceptance levels obtained better results in all WHOQoL-BREF domains: physical (57.0±8.9 vs. 51.1±12.5 vs. 42.0±6.2; p<0.001), social (62.6±19.8 vs. 52.5±20.0 vs. 45.7±16.0; p=0.019) and environmental (62.9±12.7 vs. 52.7±7.6 vs. 60.7±3.6; p<0.001), and in the ASTA HRQOL scale (10.5±5.4 vs. 16.1±7.6 vs. 20.3±0.5; p<0.001). Multiple-factor analysis showed AIS to be a statistically significant independent determinant of HRQOL in the physical domain of the WHOQoL (β=0.242) and in the overall HRQOL assessment in the ASTA HRQOL scale (β= −0.362). Other statistically significant independent predictors included: the negative impact of female sex on the physical (β= −0.291) and social (β= −0.284) domains of the WHOQOL-BREF, and the positive impact of urban residence on the physical WHOQOL-BREF domain and on symptom intensity in the ASTA symptom scale.

Conclusions:

Acceptance of illness is an important factor which has been shown to impact on HRQOL in atrial fibrillation. Female sex is a predictor of worse HRQOL, while urban residence improves HRQOL in the physical domain and decreases symptom intensity (ASTA symptom scale).

Utilization and Predictors of Electrical Cardioversion in Patients Hospitalized for Atrial Fibrillation

Atrial fibrillation (AF) is a common arrhythmia in adults associated with thromboembolic complications. External electrical cardioversion (DCCV) is a safe procedure used to convert AF to normal sinus rhythm. We sought to study factors that affect utilization of DCCV in hospitalized patients with AF. The study sample was drawn from the Nationwide Inpatient Sample (NIS) of the Healthcare Cost and Utilization Project in the United States. Patients with a primary discharge diagnosis of AF that received DCCV during hospitalization in the years 2000–2010 were included. An estimated 2,810,530 patients with a primary diagnosis of AF were hospitalized between 2001 and 2010, of which 1,19,840 (4.26%) received DCCV. The likelihood of receiving DCCV was higher in patients who were males, whites, privately insured, and aged < 40 years and those with fewer comorbid conditions. Higher CHADS2 score was found to have an inverse association with DCCV use. In-hospital stroke, in-hospital mortality, length of stay, and cost for hospitalization were significantly lower for patients undergoing DCCV during AF related hospitalization. Further research is required to study the contribution of other disease and patient related factors affecting the use of this procedure as well as postprocedure outcomes.

The clinical profile and pathophysiology of atrial fibrillation: relationships among clinical features, epidemiology, and mechanisms

Atrial fibrillation (AF) is the most common arrhythmia (estimated lifetime risk, 22%-26%). The aim of this article is to review the clinical epidemiological features of AF and to relate them to underlying mechanisms. Long-established risk factors for AF include aging, male sex, hypertension, valve disease, left ventricular dysfunction, obesity, and alcohol consumption. Emerging risk factors include prehypertension, increased pulse pressure, obstructive sleep apnea, high-level physical training, diastolic dysfunction, predisposing gene variants, hypertrophic cardiomyopathy, and congenital heart disease. Potential risk factors are coronary artery disease, kidney disease, systemic inflammation, pericardial fat, and tobacco use. AF has substantial population health consequences, including impaired quality of life, increased hospitalization rates, stroke occurrence, and increased medical costs. The pathophysiology of AF centers around 4 general types of disturbances that promote ectopic firing and reentrant mechanisms, and include the following: (1) ion channel dysfunction, (2) Ca(2+)-handling abnormalities, (3) structural remodeling, and (4) autonomic neural dysregulation. Aging, hypertension, valve disease, heart failure, myocardial infarction, obesity, smoking, diabetes mellitus, thyroid dysfunction, and endurance exercise training all cause structural remodeling. Heart failure and prior atrial infarction also cause Ca(2+)-handling abnormalities that lead to focal ectopic firing via delayed afterdepolarizations/triggered activity. Neural dysregulation is central to atrial arrhythmogenesis associated with endurance exercise training and occlusive coronary artery disease. Monogenic causes of AF typically promote the arrhythmia via ion channel dysfunction, but the mechanisms of the more common polygenic risk factors are still poorly understood and under intense investigation. Better recognition of the clinical epidemiology of AF, as well as an improved appreciation of the underlying mechanisms, is needed to develop improved methods for AF prevention and management.

A systematic review of depression and anxiety in patients with atrial fibrillation: the mind-heart link

Atrial fibrillation (AF) is the most commonly seen arrhythmia in clinical practice. At present, few studies have been conducted centering on depression and anxiety in AF patients. Our aim in this systematic review is to use the relevant literature to (1) describe the prevalence of depression and anxiety in AF patients, (2) assess the impact that depression and anxiety have on illness perception in patients with AF, (3) provide evidence to support a hypothetical connection between the pathophysiology of AF and depression and anxiety, (4) evaluate the benefit of treatment of AF on depression and anxiety, and (5) give insight on medically managing a patient with AF and concomitant depression and anxiety.

Current Evidence and Recommendations for Rate Control in Atrial Fibrillation

Atrial fibrillation (AF) is the most common cardiac arrhythmia encountered in clinical practice, which is associated with substantial risk of stroke and thromboembolism. As an arrhythmia that is particularly common in the elderly, it is an important contributor towards morbidity and mortality. Ventricular rate control has been a preferred and therapeutically convenient treatment strategy for the management of AF. Recent research in the field of rhythm control has led to the advent of newer antiarrhythmic drugs and catheter ablation techniques as newer therapeutic options. Currently available antiarrhythmic drugs still remain limited by their suboptimal efficacy and significant adverse effects. Catheter ablation as a newer modality to achieve sinus rhythm (SR) continues to evolve, but data on long-term outcomes on its efficacy and mortality outcomes are not yet available. Despite these current developments, rate control continues to be the front-line treatment strategy, especially in older and minimally symptomatic patients who might not tolerate the antiarrhythmic drug treatment. This review article discusses the current evidence and recommendations for ventricular rate control in the management of AF. We also highlight the considerations for rhythm control strategy in the management of patients of AF.

Cost effectiveness of antiarrhythmic medications in patients suffering from atrial fibrillation

Atrial fibrillation (AF), a supraventricular tachycardia disorder, is the most common sustained cardiac arrhythmia affecting 1-2 % of the general population. Prevalence is highly related to age, with every fourth individual older than 40 years old developing AF during his lifetime. Due to an aging population, the prevalence of AF is estimated to at least double within the next 50 years. This article presents AF-related cost-of-illness studies and reviews 19 cost-effectiveness studies and six cost studies published roughly over the past decade, which have compared different antiarrhythmic medications for AF. A systematic literature search for studies published between June 2000 and December 2011 was conducted in PubMed using the combination of keywords ((atrial fibrillation OR atrial flutter) AND cost). Current cost-effectiveness analyses of dronedarone and the pill-in-the-pocket strategy are subject to substantial uncertainties with regard to clinical benefit. Comparing rate control with rhythm control, a cost-effectiveness advantage for rate control was shown in several but not all studies. Within antiarrhythmic drug treatments, magnesium added onto ibutilide was shown to be more cost effective than ibutilide alone. Comparing chemical and electrical cardioversion, the latter was recommended as more cost effective from the healthcare system perspective in all reviewed studies but one. Catheter ablation appeared more cost effective than antiarrhythmic drugs in the medium to long run after 3.2-63.9 years. Admissions to hospital, inpatient care and interventional procedures as well as mortality benefit are key drivers for the cost effectiveness of AF medications. No clear cost-effectiveness advantage emerged for one specific antiarrhythmic drug from the studies that compared antiarrhythmic agents. Rate control as well as catheter ablation appear more cost effective than rhythm control in the treatment of AF. Rate control treatment also seems more cost effective than electrical cardioversion in AF patients.

Cost of atrial fibrillation: invasive vs non-invasive management in 2012

Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia. It places an enormous burden on the patients, caregivers and the society at large. As a chronic illness, AF accrues significant costs related to clinical presentation, complications and loss of productivity. Novel invasive approaches to AF promise a cure in some patients and a significant reduction in AF burden in others, but are very expensive. This paper will address the cost of conventional and invasive strategies in AF care and will review the evidence on the comparative cost effectiveness of these approaches.

A review of the cost of atrial fibrillation

OBJECTIVES

To systematically review and synthesize the literature on the costs of atrial fibrillation (AF) with attention to study design and costing methods, geography, and intervention approaches.

METHODS

A systematic search for previously published studies reporting the costs for AF patients was conducted. Data were analyzed in three steps: first by evaluating overall system costs; second by evaluating the relative contribution of specific cost components; and third by examining variations across study designs, across primary treatment approach, and by geography. Finally, a specific review of the treatment costs associated with anticoagulation treatment was examined given the clinical importance and attention given to these costs in the literature.

RESULTS

The literature search resulted in 115 articles. On review of the abstracts or full text of these articles, 21 articles met all study criteria and reported on health system AF-related direct costs. A further six articles focused exclusively on anticoagulation costs for patients with AF. The overall average annual system cost across 27 estimates obtained from the literature was $5450 (SD = $3624) in 2010 Canadian dollars and ranged from a low of $1,632 to a high of $21,099. About one-third of these costs could be attributed to anticoagulation management. The largest cost component was acute care, followed by outpatient and physician and then medication-related costs.

CONCLUSION

AF-related medical costs are high, reflecting resource-intensive and long-term treatments including anticoagulation treatment. These costs, accompanied with increasing prevalence, justify increased attention to the management of patients with AF. Future studies of AF cost should ensure a broad assessment of the incremental direct medical and societal cost associated with this diagnosis.

Comparison of rate control versus rhythm control for management of atrial fibrillation in patients with coexisting heart failure: a cost-effectiveness analysis

STUDY OBJECTIVE

To compare lifetime costs and health outcomes of rate control versus rhythm control for management of atrial fibrillation in patients with coexisting heart failure from the third-party payer perspective.

DESIGN

A Markov decision analysis model constructed from costs, utility, and transition probability inputs obtained from randomized clinical trials and publically available databases.

PATIENTS

A simulated cohort aged 65 years or older with persistent or paroxysmal atrial fibrillation and heart failure.

MEASUREMENTS AND MAIN RESULTS

Markov states for rhythm control were cardioversion plus amiodarone and maintenance amiodarone, and those for rate control were β-blocker, digoxin, and calcium channel blocker. Transition states included treatment success, hospitalizations for atrial fibrillation and/or heart failure, and severe adverse effects. Economic inputs included cost for drugs, cost of hospitalizations for atrial fibrillation and/or heart failure, and cost of management of severe adverse effects. Costs were measured in 2009 U.S. dollars, and clinical outcomes in quality-adjusted life-years (QALYs). One-way and multivariable sensitivity analyses were conducted. Uncertainty intervals (UIs) were obtained from probabilistic sensitivity analyses. Rate control was found to be less costly and more effective than rhythm control. Base case and probabilistic sensitivity analyses cost and effectiveness values for rate control were $7231 (95% UI $5517-9016) and 2.395 QALYs (95% UI 2.366-2.424 QALYs); whereas those for rhythm control were $16,291 (95% UI $11,033-21,434) and 2.197 QALYs (95% UI 2.155-2.237 QALYs). No critical values were found for any model parameters in the one-way sensitivity analyses. The cost-effectiveness acceptability curves showed that rate control was considered cost-effective in 100% of cases at willingness-to-pay ratios between $0 and $200,000/QALY.

CONCLUSION

Rate control is less costly and more effective than rhythm control and should be the initial treatment for atrial fibrillation among patients with coexisting heart failure.

Update on anti-coagulation in atrial fibrillation

Atrial fibrillation (AF), the most common clinically relevant arrhythmia, affects 2.2 million individuals in the USA and 4.5 million in Europe, resulting in significant morbidity and mortality. Pharmacotherapy aimed at controlling both heart rate and rhythm is employed to relieve AF symptoms, though debate continues about which approach is preferable. AF prevalence rises with age from 0.4% to 1% in the general population to 11% in those aged >70 years. AF is associated with a pro-thrombotic state and other comorbidities; age, hypertension, heart failure and diabetes mellitus all play a key role in AF pathogenesis. Anti-coagulation is essential for stroke prevention in patients with AF and is recommended for patients with one or more risk factors for stroke. Used within the recommended therapeutic range, warfarin and other vitamin K antagonists decrease the incidence of stroke and mortality in AF patients. Warfarin remains under-used, however, because of the perceived high risk of haemorrhage, narrow therapeutic window and need for regular monitoring. Several novel anti-coagulants show promise in AF-related stroke prevention. In particular, the novel, oral, direct thrombin inhibitor, dabigatran etexilate, recently licensed by the US Food and Drug Administration (FDA) and Health Canada has shown improved efficacy and safety compared with warfarin for stroke prevention in AF, and has the potential to replace warfarin in this indication. The increasing number of new therapeutic options, including improved anti-arrhythmic agents, novel anti-coagulants and more accessible ablation techniques, are likely to deliver better care for AF patients in the near future.

What are the costs of atrial fibrillation?

The costs of atrial fibrillation (AF) are linked to the general cost of managing AF patients in different health-care systems, as well as the cost of managing AF-related complications (e.g. hospitalizations and long-term complications, such as stroke). In addition, indirect medical costs, such as care for patients who do not recuperate fully from a vascular event, and non-medical costs such as loss of work force add to the costs of AF. All estimations for cost of AF and cost of AF therapy are based on assumptions and markedly influenced by these cost determinants. This urges for extreme caution not to take cost estimates at their absolute values. In fact, even relative comparisons between interventions may have different consequences in terms of direct and indirect costs in different health-care settings. While newer therapeutic options appear to increase the cost of AF management, newer antithrombotic substances and adequate rhythm control therapy also carry the promise of preventing the two major drivers of AF-related cost, hospitalizations and AF-related complications. Formal assessment of the cost of AF requires adjustment to local practice, and more data are clearly needed especially from primary care to better estimate the 'real' cost impact of AF.

[Atrial fibrillation in 2010: an increasing morbidity and mortality burden]

AF, a frequent and banal arrhythmia, is a debilitating and costly disease. The majority of patients with AF are aged 60 to 80 years, but the prevalence is as high as 10% after 80 years and the incidence increases in recent years in an "epidemic" way. AF is responsible for an excess of mortality with an relative risk between 2 and 4 depending of age and sex, especially as cardiovascular risk factors are associated. The morbidity is also important, with cerebral systemic embolism (2-3% per year), heart failure (1 patient for 3), and a total risk of hospitalization from 20 to 30% per year for AF patients with high cardiovascular risks. Whatever be the reasons for hospitalization, cardiovascular or not, in connection with AF or not, these reasons must be well analyzed, so that the risk of occurrence of hospitalization should reflect the efficacy of anti-arrhythmic drugs, or of their complications, or of the comorbidities associated with AF, so common in these older subjects. This morbidity-mortality composite endpoint should now be used in AF randomized trials, as occurring more frequently than mortality (4% per year) or embolic or hemorrhagic usual endpoints. Medico-economic consequences are significant and AF cost is almost 1% of total health spending, with 20% to 30% of the cost for anti-arrhythmic or anti-thrombotic drugs, and 50 to 60% for hospitalizations. Prevention of hospitalizations related to atrial fibrillation may represent a therapeutic target priority on the medico-economic ground.

Twenty-five years in the making: flecainide is safe and effective for the management of atrial fibrillation

Atrial fibrillation (AF) is the most common arrhythmia in clinical practise and its prevalence is increasing. Over the last 25 years, flecainide has been used extensively worldwide, and its capacity to reduce AF symptoms and provide long-term restoration of sinus rhythm (SR) has been well documented. The increased mortality seen in patients treated with flecainide in the Cardiac Arrhythmia Suppression Trial (CAST) study, published in 1991, still deters many clinicians from using flecainide, denying many new AF patients a valuable treatment option. There is now a body of evidence that clearly demonstrates that flecainide has a favourable safety profile in AF patients without significant left ventricular disease or coronary heart disease. As a result of this evidence, flecainide is now recommended as one of the first-line treatment options for restoring and maintaining SR in patients with AF under current treatment guidelines. The objective of this article is to review the literature pertaining to the pharmacological characteristics, safety and efficacy of flecainide, and to place this drug in the context of current therapeutic management strategies for AF.

Cost of illness and drivers of cost in atrial fibrillation in Sweden and Germany

BACKGROUND

Atrial fibrillation (AF) is an important public health problem in European countries. AF is associated with increased morbidity and mortality, e.g. from heart failure and thromboembolic events. Little data have previously been presented regarding the costs of treatment in patients with AF.

OBJECTIVE

To estimate total direct and indirect costs in patients with AF in Sweden and Germany, and to identify determinants of total costs.

METHODS

A cross-sectional observational study was conducted through surveys to patients and their treating physician in primary care and in hospital outpatient cardiology departments in Sweden and Germany. A total of 922 patients with AF as diagnosed in clinical practice were enrolled and completed the study. Data were collected on medical history, treatment, medical and non-medical resource use, and employment status. Costs (year 2005 values) were calculated by multiplying resources used with prices specific for Sweden and Germany, respectively.

RESULTS

Total annual costs per patient were €7241 in Sweden and €5586 in Germany. Slightly less than 70% of total costs were judged as being AF related in both countries. Costs of AF-related medication were about 2% of total costs in both countries. In a generalized regression model, costs were found to increase with age, but were lower in patients aged>65 years than in those aged<or=65 years, due to the absence of indirect costs in older patients. Costs were highest in patients with persistent AF and lowest in those with permanent AF. Co-morbidities with a significant influence on costs included coronary heart disease, cerebrovascular disease, heart failure and asthma.

CONCLUSIONS

Current costs in AF patients are driven by the consequences of AF, while costs for specific treatments for AF are low. The addition of new, effective and safe treatment options could potentially reduce overall healthcare costs in AF.

Incidence and economic burden of suspected adverse events and adverse event monitoring during AF therapy

OBJECTIVE

Rhythm- and rate-control therapies are an essential part of atrial fibrillation (AF) management; however, the use of existing agents is often limited by the occurrence of adverse events. The aim of this study was to evaluate suspected adverse events and adverse event monitoring, and associated medical costs, in patients receiving AF rhythm-control and/or rate-control therapy.

RESEARCH DESIGN AND METHODS

This retrospective cohort study used claims data from the Integrated Healthcare Information Systems National Managed Care Benchmark Database from 2002-2006. Patients hospitalized for AF (primary diagnosis), and who had at least 365 days' enrollment before and after the initial (index) AF hospitalization, were included in the analysis. Suspected AF therapy-related adverse events and function tests for adverse event monitoring were identified according to pre-specified diagnosis codes/procedures, and examined over the 12 months following discharge from the index hospitalization. Events/function tests had to have occurred within 90 days of a claim for AF therapy to be considered a suspected adverse event/adverse event monitoring.

RESULTS

Of 4174 AF patients meeting the study criteria, 3323 received AF drugs; 428 received rhythm-control only (12.9%), 2130 rate-control only (64.1%), and 765 combined rhythm/rate-control therapy (23.0%). Overall, 50.1% of treated patients had a suspected adverse event and/or function test for adverse event monitoring (45.5% with rate-control, 53.5% with rhythm-control, and 61.2% with combined rhythm/rate-control). Suspected cardiovascular adverse events were the most common events (occurring in 36.1% of patients), followed by pulmonary (6.1%), and endocrine events (5.9%). Overall, suspected adverse events/function tests were associated with mean annual per-patient costs of $3089 ($1750 with rhythm-control, $2041 with rate control, and $6755 with combined rhythm/rate-control).

LIMITATIONS

As a retrospective analysis, the study is subject to potential selection bias, while its reliance on diagnostic codes for identification of AF and suspected adverse events is a source of potential investigator error. A direct cause-effect relationship between suspected adverse events/function tests and AF therapy cannot be confirmed based on the claims data available.

CONCLUSIONS

The incidence of suspected adverse events and adverse event monitoring during AF rhythm-control and/or rate-control therapy is high. Costs associated with adverse events and adverse event monitoring are likely to add considerably to the overall burden of AF management.

Secondary Prevention of Cardioembolic Stroke: Oldest and Newest Promises

Atrial fibrillation (AF) is the most common cause of cardioembolism. An update on secondary prevention strategies used to protect from the risk of stroke AF patients is presented. The main line of actions of stroke prevention in AF are antithrombotics (anticoagulant or antiplatelet), antiarrhythmics (for rate control and sinus rhythm restore), mechanical means (for occlusion of the left atrial appendage or protection of the internal carotid artery from emboli). Classic pharmacological prevention with K vitamin Kantagonists such as warfarin may be overcome by direct thrombin inhibitors like ximelagatran and melagatran. New ablation technologies promise to cure, at least a part of Nonvalvolae AF in the community, restoring sinus rhythm. Recent achievements on endovascular procedures deploying carotid artery implants provide an opportunity to divert emboli to nonhazardous locations, whereas cardiac devices can seal left atrial appendages and avoid risk of clot migration in the blood stream. In the next decade, the challenge will be to understand competitiveness between old and new drugs with endovascular implants.

The costs of care in atrial fibrillation and the effect of treatment modalities in Germany

OBJECTIVE

Atrial fibrillation (AF) is an increasing burden on health-care systems because of an aging population. This study aimed to estimate health-care resource use and costs of treating AF in Germany.

METHOD

A 6-month multicenter prospective observational cohort study with additional 3-month retrospective clinical data collection was performed in physician practices. AF-related resource use was documented by 3-month retrospective and 6-month prospective clinical data from physician charts and prospectively by patient questionnaires at 3 and 6 months. Cost calculation was from the health-care payer perspective.

RESULTS

A total of 361 patients (mean age 71 +/- 9 years, 61% male) were recruited from 45 physician practices. Of 311 (86.1%) patients with complete data, 75% had persistent AF; oral anticoagulation and/or aspirin were prescribed in 98%. A rhythm-control strategy was applied in 27%, rate control in 58%, and 15% received neither antiarrhythmic medication nor cardioversion. A higher proportion of rhythm-control patients had paroxysmal AF (P < 0.001). Mean annual AF-related per-patient cost was 827 Euro +/- 1476 (median 386 Euro). 50% of total costs were incurred by 11% of patients, driven by AF-related hospitalizations (44%). Antiarrhythmics and stroke prophylaxis accounted for 20% and 15% of expenditures, respectively. Mean annualized costs were higher for rhythm-control patients than for rate-control patients or those without antiarrhythmic treatment (1572 vs. 780 vs. 544 Euro, P < 0.001).

CONCLUSION

This evaluation provides an overview of current treatment modalities and cost of AF management in Germany. Efforts to reduce the economic burden of AF should focus on avoidance of AF hospital admissions and optimization of stroke prevention and rhythm control.

[Atrial fibrillation]

Atrial fibrillation represents the arrhythmia that most frequently leads to hospital admission. Due to the age structure of our population and the increasing morbidity and comorbidity, one has to assume that this arrhythmia will reach an even higher prevalence. The therapeutic successes are often insufficient. First of all, it is important to diagnose and treat the underlying disease. Secondly, antiarrhythmic therapy has to be considered in symptomatic patients. In those patients and in the case of a persistent form, electrical cardioversion should be performed. Repetitive cardioversions in asymptomatic patients yield no advantage for mortality. Antiarrhythmic therapy consists of drugs of the classes Ia, Ic, and III. Concomitant anticoagulation is necessary; ASS in indicated only in patients without structural heart disease and lacking thromboembolic risk factors. If risk factors are present, effective therapy with coumarin derivatives is required. Therapy with ACE inhibitors and AT blockers leads to an advantage in patients with arterial hypertension and/or heart failure concerning the stability of sinus rhythm after cardioversion and the incidence of arrhythmia. Newer medications for anticoagulation and newer antiarrhythmic drugs raise the hope of a future therapy with higher efficacy and lower rate of side effects.

[Comparison of two electrode positions in electrical cardioversion of atrial fibrillation]

OBJECTIVE

This study aims to compare effectiveness of electrical cardioversion (ECV) in patients with chronic atrial fibrillation (AF) according to the electrode positions: anteroapical (A-A) or anteroposterior (A-P). That which restores the sinus rhythm (SR) using the least energy is considered superior.

DESIGN

Observational study comparing two consecutive series of patients. SCOPE. Intensive Care Unit (ICU) of second level hospital.

PATIENTS AND METHODS

Out-patients in AF referred to the ICU for biphasic ECV. The first series began with position A-A and the second one with A-P, administering up to 3 shocks (150-200-200J), changing to the alternative position if SR was not achieved and administering 2 more shocks of 200J. Age, gender, weight, baseline heart disease, ejection fraction, left atrial size, AF time, baseline vital signs, antiarrhythmic medication, reversion to SR, number of shocks, energy used and side effects were analyzed and compared between both series. RESULTS. A total of 50 patients were treated in each group. The baseline characteristics were similar except for a greater percentage of women in group A-A. The anteroapical electrode position achieved SR with significantly fewer numbers of shocks and less energy, more frequently achieving reversion on the first shock.

CONCLUSIONS

We found greater effectiveness in the electrical cardioversion of the AF with the electrodes in the anteroapical position, that we recommend as first choice. If it is not effective, the A-P position should be attempted.

Implication from randomized trials of rate and rhythm controls on management of patients with persistent atrial fibrillation

Recently, several randomized trials were published on the issue of rate or rhythm control for patients with atrial fibrillation (AF). Patients were typically minor symptomatic, relatively old, with age above 70, presenting with a recurrence of AF and suffering from only mild to moderate underlying heart disease. The main outcome of these trials is that rate control is not inferior to rhythm control for the management of patients with AF concerning morbidity and mortality. Also patients' quality of life did not differ significantly in follow-up in these trials. However, rhythm control is not redundant in the treatment of AF. Focus is now on subgroups of patients who could still have benefit being in sinus rhythm. For severely symptomatic patients, patients presenting with the first episode of AF and probably those with severe congestive heart failure, to restore and maintain sinus rhythm should still be the goal. With the failure of antiarrhythmic therapy, nonpharmacological approaches such as pulmonary vein isolation can be performed. Another finding of the randomized trials is that being in sinus rhythm does not prevent from the occurrence of thromboembolic complications. This means that for patients with AF, with risk factors for thromboembolic events, adequate anticoagulant therapy is indicated irrespective of the current heart rhythm. As with antiarrhythmic therapy, the search for new and safer anticoagulant therapy is underway. This review will focus on the key aspects we have learned from the randomized trials on rate and rhythm controls for patients with AF.

Noninferiority testing in cost-minimization studies: Practical issues concerning power analysis

Objectives:In cost-minimization studies, it is important to establish noninferiority in the clinical effect of the treatments under investigation. The relationship between the proportion of patients reaching the end point in a study, equivalence limit (δ), and power is investigated in the context of cost-minimization studies with dichotomous clinical end points. Two formulations of the null-hypothesis, absolute and relative formulations of δ, will be explored.

Methods:Sensitivity analysis was performed, in which the effect of the predicted proportions and δ on the power in a noninferiority setting was investigated. The patterns found are discussed in terms of the practical relevance within the cost-minimization framework.

Results:Sensitivity analyses show different patterns of results for both null-hypotheses. The differences in these results originate from the way δ is expressed. By expressing δ as absolute difference, power grows quite fast when sample proportions are smaller than expected. In the case of a proportional δ at small sample proportions, the power to establish noninferiority remains low.

Conclusions:To obtain valid results from a cost-minimization study, care has to be taken to adapt the correct methodology for noninferiority testing in clinical outcomes. Defining δ in terms of absolute differences between treatments can lead to obscured results. Although conservative, the expression of δ as a proportion of the effectiveness of the treatment as usual is found to be closer to clinical practice. The inflated δ, resulting from smaller clinical effects than expected when absolute formulation is applied, thus can be avoided.

Conversion to Sinus Rhythm by Ablation Improves Quality of Life in Patients Submitted to Mitral Valve Surgery

BACKGROUND

Atrial fibrillation can be successfully treated with surgical ablation, but the effect of restoring sinus rhythm on the quality of life has yet to be established. We evaluate the effects of left atrial ablation combined with mitral valve surgery on health-related quality of life in patients with permanent atrial fibrillation.

METHODS

Ninety-one consecutive patients with permanent atrial fibrillation underwent mitral valve surgery at our division. The last 53 also received left atrial ablation by means of monopolar radiofrequency and excision of the left appendage. The patients were divided into two groups according to the median total score obtained at the Short Form 36 Health Survey used to evaluate their quality of life (ie, the good quality of life group [n = 54] and the poor quality of life group [n = 37]).

RESULTS

Preoperative and intraoperative data of the two groups were similar. In-hospital mortality and morbidity were similar in both groups. Sinus rhythm was obtained in 68% of patients (36 of 53) treated with left atrial ablation and it occurred spontaneously in 10% of patients (4 of 38) treated for the mitral pathology only. At follow-up, there was no difference between the groups in ejection fraction, left atrial diameter, mitral dysfunction, tricuspidal regurgitation, and New York Heart Association functional class. Using stepwise logistic regression, only the presence of sinus rhythm was associated with better quality of life.

CONCLUSIONS

In patients submitted to mitral surgery, conversion to sinus rhythm by left atrial ablation can significantly improve the health-related quality of life.

Cost of diagnosis and treatment of syncope in patients admitted to a cardiology unit

AIMS

Despite the large number of hospital admissions due to syncope, information on the in-hospital cost of management of these patients remains incomplete.

METHODS AND RESULTS

In order to assess such cost, we analysed the clinical histories of the patients suffering from syncope who were admitted to our Unit of Cardiology in 2003. We determined the length of stay (in days) for each inpatient, the number of diagnostic tests performed, and the various therapeutic procedures undertaken. Two hundred and three patients (mean age 68 +/- 14, 49% female) were admitted because of syncope. Final diagnoses on discharge were drug-induced syncope in 10 patients, vasovagal syncope in 11, syncope secondary to cardiac ischaemia in 18, valvular disease in 4, rapid supraventricular arrhythmia in 20, ventricular arrhythmia in 19, atrioventricular block in 90, and unexplained syncope in 31 patients. Of these 203 patients, 70 (34.5%) had a previous history of cardiac disease. The global cost for all 203 patients was 2,264,979 Euros. The overall cost per patient was 11,158 Euros (range: 1651-31,762) including stay, diagnosis, and treatment. The overall cost of hospital stay per patient was 3718 Euros (range: 1436-5679). The overall cost per diagnosis of the 203 patients was 1141 Euros (range: 155-3577), and the cost of the therapeutic procedures required was 6299 Euros (range: 0-23 115). The most expensive were those cases of syncope secondary to ventricular arrhythmia, the cost of which is 20 times that of drug-induced syncope.

CONCLUSION

The cost per diagnosis and treatment of a patient admitted because of syncope varies widely with important differences depending on the specific cause.

Is atrial fibrillation an inflammatory disorder?

There is mounting evidence to support the influence of inflammation in the pathogenesis of atrial fibrillation (AF). Indeed, AF is associated with increased levels of known inflammatory markers, even after adjustment for confounding factors. The renin-angiotensin-aldosterone system (RAAS) appears to play a key role in this process. Atrial biopsies from patients with AF have also confirmed the presence of inflammation. Furthermore, there is preliminary evidence to support a number of drug therapies that have the potential to reduce the clinical burden of AF. In this review, we present an overview of the evidence supporting a link between inflammation and AF, and some of the drug therapies, such as the angiotensin-converting enzyme inhibitors, angiotensin II receptor blockers, steroids, fish oils, and vitamin C, that might be efficacious in the prevention of AF by modulating inflammatory pathways.

Rhythm vs. rate control of atrial fibrillation meta-analysed by number needed to treat

BACKGROUND

Whenever feasible, rhythm control of atrial fibrillation (AF) was generally preferred over rate control, in the belief that it offered better symptomatic relief and quality of life, and eliminated the need for anticoagulation. However, recent trials appear to challenge these assumptions.

AIMS

To explore the desirability of rhythm vs. rate control of AF by systematic review of pertinent, published, randomized controlled trials (RCTs) and a meta-analysis by number needed to treat (NNT) year(-1), with respect to diverse clinically important outcomes.

METHODS

RCTs of outcome primarily comparing rate vs. rhythm control in patients with spontaneous AF were identified. For each outcome and assuming rhythm control to be the active treatment, relative risk reduction (RRR) and NNT year(-1) were derived for individual trials together with an NNT year(-1) for all trials combined; corresponding 95% confidence intervals (CI) were also calculated. Adverse drug reaction (ADR) and quality of life reporting were also assessed.

RESULTS

In all, data from five suitable RCTs (entailing 5239 patients) were analysed. For hospitalization, available RRRs and NNT year(-1) values were all clinically and statistically significant. Overall, one additional patient was hospitalized for every 35 assigned to rhythm control (95% CI 27, 48). For the endpoints of death, 'ischaemic' stroke and 'non-CNS' bleeding, there was no significant difference. ADRs were significantly more common in rhythm control patients, whereas quality of life assessments revealed no difference. Thromboembolism was associated with cessation of or subtherapeutic anticoagulation, irrespective of treatment assignment.

CONCLUSION

Reduced risk of hospitalization and non-inferiority for other endpoints all favour rate control, the less costly strategy. If symptoms of AF are not a problem, treatment should target optimizing rate control and more widespread and effective prophylactic anticoagulation.

Rate versus rhythm control in the management of patients with atrial fibrillation

The management of patients with atrial fibrillation involves three main areas: anticoagulation, rate control and rhythm control. Importantly, these are not mutually exclusive of each other. Anticoagulation is necessary for patients who are at a high risk of stroke; for example, those who are older than 75 years, or those who have hypertension, severe left ventricular dysfunction, previous cerebrovascular events, or diabetes. It is now clear that patients who are at a high risk of stroke require long-term anticoagulation with warfarin regardless of whether a rate-control or rhythm-control strategy is chosen. One possible exception might be patients who are apparently cured with catheter ablation. Several published trials comparing rate-control and rhythm-control strategies for the treatment of patients with atrial fibrillation have shown no difference in mortality between these approaches. The patients enrolled in these studies were typically over 65 years of age. Data comparing rate and rhythm strategies in patients who are younger than 60 years of age are limited. For more elderly patients, it seems reasonable to consider rate control as a primary treatment option and to reserve rhythm control for those who do not respond to rate control. For younger patients, we prefer to start with a rhythm-control approach and to reserve rate-control approaches for patients in whom antiarrhythmic drugs, ablation, or both, do not ameliorate the symptoms.