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Impact of AF Ablation on Quality of Life


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The Impact of Atrial Fibrillation Ablation on Quality of Life.

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Jacob Pontoppidan MD, PhD.
Department of Cardiology, University Hospital of Odense, DenmarkSdr. Boulevard 29, 5000 Odense C, Denmark


Abstract

Quality of life (QoL) is a very important endpoint in trials reporting the efficacy of catheter ablation in patients with atrial fibrillation (AF). It has been shown that AF ablation significantly improves the QoL, but recent studies question the usefulness of the most used generic QoL instrument in AF patients. The complexity of the disease makes it mandatory to employ disease specific instruments in the assessment of QoL. This paper reviews the current knowledge of various QoL instruments, including the limitations and pitfalls, and the impact of AF ablation on the QoL.

Introduction

The cornerstone of treatment in patients with atrial fibrillation (AF) is to reduce symptoms and improve the quality of life (QoL).1 The QoL is significantly reduced in AF patients, caused not only by symptoms related to the arrhythmia, but also the medication. Several trials have demonstrated that catheter ablation of AF improve the QoL significantly,2-14 and QoL should be assessed and re- ported in every clinical trial with patients under- going an intervention due to symptomatic AF.15 However, concerns have been raised that the present QoL instruments are not sufficiently sensitive to detect changes in disease specific symptoms, such as those associated with AF. Several instru ments to evaluate disease specific QoL exist 16-19but there is a lack of consensus regarding how to evaulate the QoL in AF patients. This paper reviews the current knowledge of various QoL instruments, and the impact of AF ablation on the QoL.


QoL Assessment

QoL is a subjective phenomenon, and there is no consensus of how to define QoL. The World Health Organisation defined health as the absence of disease and the presence of physical, mental and social well-being. Hence, QoL is a complex and multidimensional quantity to measure, which explains why over 35 different QoL instruments have been reported.15Most instruments are not specific for AF patients, which has led to the development of new QoL instruments. Table 1 presents the most used QoL instruments.


Generally, the QoL assessment should include both a generic and symptom specific instrument. Generic instruments are used to evaluate the physical, mental and social well-being. The most used questionaire is the multi-purpose, short-form health survey with 36 questions (SF-36). The SF-36 form is very well-validated and has been applied in various types of patients and the general population.20 It yields an 8-scale profile of functional health and well-being scores including physical function (PF), role-physical (RP), bodily pain (BP), general health (GH), vitality (VT), social function (SF), role-emotional (RE) and mental health (MH). The scores in each of the eight subscales are standardized from 0 to 100, with the higher scores indicating better QoL. Several studies have compared the QoL in AF patients with the general population, and patients with other cardiac diseases.1


Quality of Life Measures

Quality of Life Measures Used in Atrial Fibrillation Studies (Table 1).


Table 1:Quality of Life Measures Used in Atrial Fibrillation Studies

The EuroQol (EQ-5D) is a well-validated, generic health-related quality-of-life measure.21 It is self-administered and has 5 dimensions assessing mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. It also includes a visual analog scale that asks respondents to rate their current health from 0 to 100, with 0 representing death and 100 indicating perfect health. The 5-item questionnaire can also be transformed to a societal-based utility score, ranging from 0 to 1, with higher scores reflecting better healthstatus.


However, generic QOL instruments may not be sufficiently sensitive or focused to detect changes in disease specific symptoms, such as those associated with AF. Several instruments to evaluate disease specific QoL exist. The most commonly used disease specific questionnaire is the AF Symptom Checklist (AFSCL), which measures frequency and severity of AF related symptoms.22 The AFSCL is easy to use, and has been used in a high number of AF studies. The Atrial Fibrillation Severity Scale (AFSS) is a 19-item selfadministered questionnaire developed to capture subjective and objective ratings of AF related symptoms, health care utilization, and AF disease burden, including frequency, duration, and severity of episodes .23 The AF symptom burden score is derived from the AFSS summary score that averages the frequency, duration, and patient perceived severity of AF episodes. A higher score indicates greater AF burden. Another QoL instrument is the Mayo AF-Specific Symptom Inventory (MAFSI) that was introduced to clinically follow AF-specific symptoms. Although it has some common elements with the AF Symptom Checklist, the MAFSI inventory monitors additional symptoms. Using a checklist of 12 symptoms, patients score the frequency of symptoms over 6 months as 0 (never), 1 (rarely), 2 (sometimes), 3 (often), and 4 (always). Total scores range from 0 to 48. It was recently used in a publication by Woklu et al., but has not yet been validated.18


The need for comprehensive, disease specific measurement tools, to quantify the effect of AF on patients QoL more accurately and reliably, has led to the development of new QoL instruments specific for AF patients.


The AF-QoL questionnaire was recently developed and validated in a Spanish population.17 The AF-QoL instrument is an 18-item self-administered questionnaire with three domains: psychological, physical, and sexual activity. The psychological domain includes seven items, the physical domain includes eight items, and the sexual activity domain includes three items. The questions refer to the previous month. All domains have been standardized for a scoring between 0 (worst QoL) and 100 in order to facilitate interpretation and comprehension. The AF-QoL is able to discriminate between AF patients and patients with previous myocardial infarction in contrast to other questionnaires such as the AFSCL or the SF-36. Additionally, AF patients with a higher percentage of clinical symptoms such as palpitations, chest discomfort, and dyspnea had lower scores demonstrating the discriminant validity of the questionnaire. In this context, the AF-QoL may be a necessary tool to evaluate the QoL and well-being in patients with intermittent AF who are in sinus rhythm at the time of evaluation and completely asymptomatic allthough severely affected by the disorder regardless the absence of symptoms at the moment of evaluation.


Another disease specific QoL instrument is the AFEQT questionnaire that has shown to be valid, reliable, and responsive to clinical change in AF patients.16 It is a 20-item instrument including a 4-item Symptoms score, an 8-item Daily Activities score, a 6-item Treatment Concerns score, and a 2-item Treatment Satisfaction scale. The first 3 of these domains can be grouped to form an Overall score. This score was able to distinguish between patients with asymptomatic and symptomatic AF, but also between patients who had AF symptoms within 4 weeks versus 4 weeks from questionnaire completion. It was more responsive to changes in patients` QoL related to pharmacological therapy and ablation therapy as compared the generic SF-36 and EQ-5D questionnaires. The AFEQT was as responsive as the disease specific AFSCL and AFSS.


Other instruments used for quantifying the symptoms related to AF have been published.1 The European Heart Rhythm Association (EHRA) AF classification and the Canadian Cardiovascular Society Severity in Atrial Fibrillation Scale (CCS-SAF) are instruments to quantify symptoms and functional capacity in patients with AF similar to the New York Heart Association (NYHA) functional class score in patients with heart failure.19 Both instruments are easily applied and learned without the need for extensive training and experience. However, the CCS-SAF classification is the only one validated, and correlates highly with mental and physical aspects of QOL, patient-perceived severity of AF, the degree of symptoms judged from a validated questionnaire, and general well-being.


Limitations of QoL Instruments in AF Patients

AF is a very heterogenous disease making the QoL assessment in these patients difficult. Some studies have found that the impact is greater on the physical domain, and that QoL also depends on individual experiences, beliefs and expectations regarding the disease. Sociodemographic variables, like age and gender, also affect QoL, with female patients and those under the age of 69 obtaining the worst score.15


Studies show that QoL improve over time irrespective of rate- or rhythmcontrol,1 which may relate to the low sensitivity of the generic instruments to changes in an AF patient. Furthermore, AF patients with paroxysmal AF may be in sinus rhythm at the time of evaluation or even asymptomatic during AF. The correlation between AF recurrence and subjective measurements like QoL is poor. This emphasizes the importance of symptom specific QoL assessment that allow a better assessment of the impact of this disease on patient's daily living while, in addition, other specific aspects of the disease can be identified. Most studies of AF ablation and QoL have been performed in patients with severe symptoms with a higher impact on the changes of the QoL. In a general population of patients undergoing AF ablation, the less symptomatic patients may reach scores of approximately 100 (ceiling effect) and subtle changes in the QoL cannot be evaluated. In this case, the disease specific QoL instruments seem more reliable.


Studies of changes in QoL in AF intervention should be performed prospectively. There might be some recall bias in retrospective studies overestimating the QoL scores before intervention.15


One limitation of studies assessing changes in QoL after ablation is the lack of details regarding how the QoL surveys were administered. Self-assessments of well-being by individuals can be biased by adaptation behaviour. Adaptation is aimed at reducing or eliminating psychological distress, and may explain why patients with health problems report higher levels of well-being than expected. Hence, adaptation behaviour may bias the answers to survey questions on subjective well-being or subjective quality of life which should be considered in trials reporting QoL. Patients may also respond more truthfully to self-administered questionnaires compared to interviewer-administered surveys. QoL surveys administered by a nurse or physician involved in the study may be associated with report bias, since they may have an incentive to underestimate the QoL of patients before the treatment and to overestimate the QoL after the medical intervention.


Timing of the QoL surveys should also be considered. It might be speculated that patients may report a lower QoL before ablation biased by anxiety in the light of an upcoming invasive procedure.


Furthermore, the placebo effect is difficult to comprehend, and some trials suggest that the placebo effect is significant and may overestimate the QoL changes. The only way to objectively assess the impact of ablation on QoL would be a randomized trial with a sham ablation procedure but due to ethics, sham ablations have not yet been performed. Instead, researchers may theoretically minimize the placebo effect in AF trials by reporting long term QoL assessment after ablation.


Additionally, caution is needed when interpreting the results because the positive changes in QoL may not related to control of the rhythm. In fact, many patients with AF have periods of asymptomatic AF, so it is recommended to evaluate the rhythm outcome after AF ablation using long-term rhythm monitoring.24


Quality of Life After AF Ablation

The aim of catheter ablation in patients with AF is to reduce symptoms and improve the QoL. Several studies have shown that the QoL improve significantly after AF ablation assessed primarily by the generic SF-36 questionnaire as shown in Table 2.2-11 Woklu and collegues recently published the long-term effect of AF ablation on outcome and QoL in 323 patients with AF (50% paroxysmal).18 They used the SF-36 questionnaire and disease specific MAFSI instrument for QoL analysis. They found a marked and sustained improvement in QoL at 2 years of follow-up, but QoL improvement was not closely linked to overall ablative efficacy. Although the QoL improvement was high in patients with AF elimination, substantial QoL improvement was also seen in patients with AF control on anti-arrhythmic drugs and in patients with recurrent AF. In contrast, the MAFSI instrument was better to detect changes in AF-specific symptoms and was more strongly correlated to the efficacy of AF ablation.


Table 2: Studies with QoL assessment after AF ablation

AF: atrial fibrillation, SR: sinus rhythm, QoL: quality of life, PAF: paroxysmal AF, FU: follow-up, PV: pulmonary vein, PVI: pulmonary vein isolation, CFAEs: complex fractionated atrial electrograms, CTI: cavotricuspid isthmus ablation, BMI: body mass index, AAD: anti-arrhythmic drug, CHF: congestive heart failure, LVEF: left ventricular ejection fraction, PCS:physical composite summary, MCS: mental composite summary, AFSS: AF Severity Scale, AFSCL: AF Symptom Checklist: Frequency and Severity, MAFSI: Mayo AF–Specific Symptom Inventory.mus or zotarolimus) and at least 6 months for a –taxel –eluting stent.

Similar findings were reported by Fichter et al., who assessed the QoL after catheter ablation for symptomatic, drug-AF using 7 different validated generic and disease-specific instruments (AFSS, AFSCL, WHO-5-Well-Being-Index (WHO), Major Depression Inventory (MDI), Sleep and Vegetative disorder (SV), Vital Exhaustion (VE), and Illness intrusiveness(Ii).25 During long-term follow-up, a highly significant improvement in all QoL questionnaires was found regardless of ablation success. Only the disease-specific questionnaires AFSS and AFSCL and the generic questionnaire MDI were able to detect a difference in improvement between patients with AF elimination or recurrences.


In a previous study, we found that patients who had asymptomatic AF recurrences one year after ablation showed improvement in the subscales of general health, vitality and role physical reflecting an improvement in the physical scores using the SF-36 questionnaire.26 This improvement was obtained even though these patients often had persistent AF. Such transition to less severe or asymptomatic disease states could be due to direct ablation effects, secondary destruction of autonomic inputs to the atrium, or Woklu and collegues recently published the long-improved pharmacologic efficacy. Other explanations may be an overestimation of QoL improvement due to regression to the mean (less symptomatic on average than at presentation), placebo effects, or maybe the fact that the SF-36 questionnaire does not entirely describe the QoL burden that a complex disease such as AF imposes on the well-being of patients. The result underlines that a QoL assessment should include an AF-specific symptom instrument that reflect the efficacy of ablation more accurately.


Three randomized clinical trials compared catheter ablation to antiarrhythmic drug therapy in patients with paroxysmal AF, and also evaluated QOL as an outcome measure.12,13,27 Catheter ablation was associated with significant improvement in SF-36 scores relative to baseline. QOL scores were significantly higher in patients undergoing ablation than in patients treated with drug therapy, in which there was little change from baseline scores. Similar significant trends were observed for the AFSCL scores. One randomized study examined QOL in 146 patients with persistent AF, randomized to catheter ablation or cardioversion alone.28 This study demonstrated that catheter ablation was more effective in maintaining sinus rhythm, and patients who were in sinus rhythm demonstrated a greater improvement in the symptom severity score than those patients with recurrent AF or atrial flutter.


A non-randomized study showed that 58 patients with longstanding persistent AF and symptomatic heart failure improved both left ventricular ejection fraction (LVEF) and the QoL significantly after AF ablation compared to a control group evaluated by the SF-36 and AFSCL.5 A randomized trial compared the effect between AF ablation and AV nodal ablation with CRT (cardiac resyncronization therapy) in 81 heart failure patients with symptomatic AF (50% paroxysmal). AF ablation increased the LVEF and the the 6-minutes walk test significantly compared to AV nodal ablation and resyncronization. The QoL after AF ablation was also higher reflected by the changes in the Minnesota Living with Heart Failure Questionaire.29


Two prospective trials by Mohanty et al. recently evaluated the effect of obesity and metabolic syndrome (MS) on outcome after AF ablation.30,31 They found no significant difference in procedural outcome after AF ablation in high-BMI patients (Body Mass Index > 25) compared to normal-weight patients (AF freedom in 63% versus 69% of patients). High-BMI patients had significant improvement in the composite scales of QoL during follow-up, whereas normal-weight patients showed no improvement despite procedural success. In a prospective trial with 1496 patients, they found that patients with MS had a higher AF recurrence rate, especially in non-paroxysmal AF patients. AF type, female sex, and MS were independent predictors of AF recurrence. In MS patients, there were more impairment in baseline QoL and larger improvement in QoL during follow-up after AF ablation. Limitations to both studies were the lack of AF specific QoL assessment questionnaires.

Conclusions

QoL is a very important endpoint in trials reporting the effect of AF ablations. It has been shown that AF ablation significantly improve the QoL in AF patients, but recent studies question the usefulness of the most used generic QoL instrument in AF patients. The complexity of the disease makes it mandatory to employ disease specific instruments in the assessment of QoL. However, the new disease specific QoL instruments AF-QoL and AFEQT appear very promising and with further investigation may become a recommended tool for clinical research and clinical practice.

Disclosures

Jacob Pontoppidan received a fellowship grant from Biosense Webster.

References

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