Obesity Begets Atrial Fibrillation
2013; Lippincott Williams & Wilkins; Volume: 128; Issue: 4 Linguagem: Inglês
10.1161/circulationaha.113.001840
ISSN1524-4539
AutoresJared W. Magnani, Elaine M. Hylek, Caroline M. Apovian,
Tópico(s)Cardiac Imaging and Diagnostics
ResumoHomeCirculationVol. 128, No. 4Obesity Begets Atrial Fibrillation Free AccessResearch ArticlePDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessResearch ArticlePDF/EPUBObesity Begets Atrial FibrillationA Contemporary Summary Jared W. Magnani, MD, MSc, Elaine M. Hylek, MD, MPH and Caroline M. Apovian, MD Jared W. MagnaniJared W. Magnani From the National Heart, Lung, and Blood Institute and Boston University's Framingham Heart Study, Framingham, MA (J.W.M.); Section of Cardiovascular Medicine, Boston University School of Medicine, Boston, MA (J.W.M.); Department of Medicine, Section of General Internal Medicine, Boston University School of Medicine, Boston, MA (E.M.H.); and Department of Endocrinology, Diabetes, and Nutrition, Boston University School of Medicine, Boston, MA (C.M.A.). , Elaine M. HylekElaine M. Hylek From the National Heart, Lung, and Blood Institute and Boston University's Framingham Heart Study, Framingham, MA (J.W.M.); Section of Cardiovascular Medicine, Boston University School of Medicine, Boston, MA (J.W.M.); Department of Medicine, Section of General Internal Medicine, Boston University School of Medicine, Boston, MA (E.M.H.); and Department of Endocrinology, Diabetes, and Nutrition, Boston University School of Medicine, Boston, MA (C.M.A.). and Caroline M. ApovianCaroline M. Apovian From the National Heart, Lung, and Blood Institute and Boston University's Framingham Heart Study, Framingham, MA (J.W.M.); Section of Cardiovascular Medicine, Boston University School of Medicine, Boston, MA (J.W.M.); Department of Medicine, Section of General Internal Medicine, Boston University School of Medicine, Boston, MA (E.M.H.); and Department of Endocrinology, Diabetes, and Nutrition, Boston University School of Medicine, Boston, MA (C.M.A.). Originally published23 Jul 2013https://doi.org/10.1161/CIRCULATIONAHA.113.001840Circulation. 2013;128:401–405Case PresentationA 68-year-old man presents to his primary care physician describing an irregular and rapid heartbeat that has awakened him from sleep. The patient has a blood pressure of 148/92 mm Hg, a body mass index (BMI) of 35.5 kg/m2, and a history of diabetes mellitus that has been managed with oral glycemics. On auscultation, the physician appreciates occasional irregular beats without a cardiac murmur. An ECG shows normal sinus rhythm with a PR interval of 180 milliseconds and infrequent premature atrial contractions. A 24-hour Holter monitor identifies intermittent premature atrial contractions and demonstrates paroxysmal atrial fibrillation (AF) that is primarily nocturnal. The patient's inquires about (1) how obesity has contributed toward his developing AF, and (2) whether weight loss would ameliorate the risk of AF or the burden of the arrhythmia.Background: Obesity Is a Well-Described Risk Factor for AFObesity is a profound public health concern with increasing prevalence. AF is the most commonly encountered clinical arrhythmia and results in multiple adverse sequelae that include stroke, heart failure, cognitive decline, dementia, diminished quality of life, and death.1 In community- and population-based cohort studies, obesity has consistently emerged as a risk factor for AF. In comparison with normal-weight referents, obese individuals have up to a 2.4-fold increased AF risk.2 In cardiothoracic surgery cohorts, the postoperative risk of AF ranges from a 1.4- to 2.4-fold increased risk in comparison with nonobese referents.3,4 The risk of AF increases progressively with rising BMI. In a large cardiothoracic surgery series, individuals at the extreme of BMI (≥40.0 kg/m2) had a 2.3-fold increased postoperative AF risk in comparison with a 1.2-fold increased risk in the overweight (BMI 25–30 kg/m2).4 An observational cohort from the Mayo Clinic similarly showed increased likelihood of transitioning from paroxysmal to permanent AF with progressive increase in BMI.5BMI has emerged as relevant to longitudinal AF risk in multiple AF risk scores developed in community-based cohorts.6–8 Two of the risk scores were conducted in biracial cohorts, thereby enhancing their generalizability.7,8Figure 1 presents the Framingham Heart Study 10-year AF risk calculator for the patient described in the case presentation (http://www.framinghamheartstudy.org/risk/atrial.html). The patient's 10-year AF risk is calculated as 18%. In addition to systemic adiposity, regional adipose tissue deposition, specifically epicardial adipose tissue volume measured by computed tomography or MRI, has emerged as a potent risk factor for AF. The effect of epicardial fat is independent of BMI and other known risk factors for AF.9 The epidemiological data summarized here consistently indicate that obesity is associated with a substantial risk for the development of AF. A meta-analysis reported that obese individuals have a 49% increased risk of AF in comparison with nonobese individuals.10 Of paramount importance is that obesity is one of the very few modifiable risk factors for AF that have been identified.Download figureDownload PowerPointFigure 1. Application of the Framingham Heart Study 10-year Atrial Fibrillation Risk calculator. The patient has a 10-year risk of developing AF of 18%. Of note, body mass index is only 1 of 2 modifiable risk factors identified by the risk score. The calculator may be accessed at http://www.framinghamheartstudy.org/risk/atrial.html. AF indicates atrial fibrillation.Future research is essential to understand better the epidemiological associations of obesity and AF. The Table provides a summary of future directions in obesity and AF research.Table 1. Future Directions and Potential Research in the Investigation of Obesity and AFDomainDirections and Potential Research QuestionsEpidemiology and phenotype modelingDiversity of adiposity phenotypes (DEXA, skin caliper measurement, obesity subphenotypes, CT imaging)Trajectories of obesity exposure and obesity-yearsChildhood obesity and early-age weight with longitudinal (ie, multidecade) AF riskEffect modification and augmented risk from comorbiditiesCohort studies and secondary data analysisWeight loss, ie, bariatric cohorts, and AF risk assessmentEffect of weight loss on epicardial adiposity and AF riskAtrial and cardiovascular remodelingCommunity- and population-based studies of atrial remodeling and simultaneous biomarker assessment (ie, adipokines, inflammatory markers)Regression (reverse remodeling) following bariatric intervention or weight lossRegression (reverse remodeling) with risk factor amelioration (eg, OSA treatment)Genetics and genomicsGene–environment interaction relating obesity-years, genetic expression, and AF riskRelation of microRNA expression in AF to obesity-yearsAF indicates atrial fibrillation; CT, computerized tomography; DEXA, dual-energy X-ray absorptiometry; and OSA, obstructive sleep apnea.Obesity and AF: Shared Risk Factors, Shared IntermediatesObesity and metabolic disease have multifactorial contributions toward AF risk. Figure 2 describes the overlapping relation between obesity, AF, and their common, foremost clinical correlates. Hypertension, strongly associated with obesity, is a well-described risk factor for AF; the incidence of hypertension increases alongside body weight and progressive rise in obesity class. Cardiovascular disease, comprising both macro- and microvascular ischemia, is a second, highly prevalent intermediate linking obesity and AF. Central obesity constitutes part of the metabolic syndrome, and, in a community-based cohort, additional metabolic syndrome components increased the 10-year risk of incident AF to 4-fold when all 5 were present.11 Obstructive sleep apnea (OSA) merits increased emphasis for its association with nocturnal arrhythmias and for its being a highly prevalent comorbidity of obesity. In obese cohorts, the prevalence of OSA extends up to 90%.12 OSA promotes sympathetic overactivity, vascular inflammation, and heart rate variability and has associations with hypertension and metabolic risk factors. Figure 3 includes intermediate steps to suggest the multiple clinical pathways through which obesity may result in AF pathogenesis.Download figureDownload PowerPointFigure 2. Venn diagram demonstrating overlap between obesity, atrial fibrillation, and selected clinical correlates. The clinical correlates are the chief clinical associations shared by obesity and atrial fibrillation. CVD indicates cardiovascular disease; and OSA, obstructive sleep apnea.Download figureDownload PowerPointFigure 3. The figure describes the predominant intermediate mechanisms, including clinical pathways and atrial remodeling, that bridge obesity and atrial fibrillation.Back to Our CaseThe patient instituted the Dietary Approaches to Stop Hypertension (DASH) diet and received medical clearance for exercise. Over the next 2 years, he was able to reduce his BMI to 32.5 kg/m2. He used antiobesity agents (eg, tetrahydrolipstatin, or Orlistat) that work to reduce fat absorption in the gut. His history of AF precluded use of phentermine, an appetite suppressant. He developed pronounced dyspnea on exertion, and repeated ECGs and another Holter monitor now showed persistent AF. The patient's CHA2DS2-VASc score was calculated as 3 (1 point each for history of hypertension, diabetes mellitus, and age 65–74), and he was started on long-term oral anticoagulation in addition to continuing a daily aspirin. He underwent an elective cardioversion and was started on sotalol with appropriate monitoring for QT-interval prolongation and bradyarrhythmia.Obesity and Cardiovascular RemodelingCardiovascular remodeling secondary to obesity is a critical focus of investigation, identifying intermediate steps in the pathway between exposure and outcome. Atrial remodeling may be summarized as a heterogeneous process characterized by disruption of atrial electric integrity secondary to long-term clinical exposures. Alterations in atrial electrophysiological function and concomitant remodeling are maladaptive responses to the resulting metabolic, hemodynamic, and ischemic stresses. The cumulative results are electric disturbances, structural modification, and inflammation that promote interstitial atrial fibrosis and yield a proarrhythmic substrate. Obesity is associated with a 2.4-fold 10-year risk of echocardiographic left atrial volumetric enlargement.13 Ventricular diastolic function further impacts atrial integrity. Obesity and hypertension may yield ventricular hypertrophy, which in turn alters diastolic function, raising atrial pressures and promoting atrial remodeling. The up-stream mediators of atrial remodeling from obesity are shown in Figure 3.P-wave indices are derived from the surface ECG and are vectorcardiographic measurements of P-wave morphology, duration, and amplitude. They provide a low-cost, reproducible measurement of atrial electric function. P-wave indices are progressively altered by obesity and waist circumference. Figure 4 shows the cubic restricted splines that graphically display the relation between BMI and maximum P-wave duration as continuous variables in a large, biracial cohort (n=14 433).14 A single-center, small (n=63) study reported significant differences in atrial and pulmonary vein electrophysiology between obese and nonobese individuals.15 Obese individuals had shorter atrial and pulmonary vein refractory periods than nonobese individuals, suggesting a proarrhythmic substrate.Download figureDownload PowerPointFigure 4. Cubic splines relating waist circumference and P-wave duration in the Atherosclerosis Risk in Communities Study by racial strata. The solid line represents black participants and the dotted line white participants. Reprinted from Magnani et al14 with permission of the publisher. Copyright © 2012, John Wiley and Son.Biomarkers and Intermediate Pathways Relating Obesity and AFInflammatory biomarkers, increased in obesity, are an alternative avenue for relating obesity and AF pathogenesis. C-reactive protein has likely been best studied and characterized for its relation to AF. Pericardial fat, overlying atrial tissue, has received attention for its relation to obesity, adipocytokine expression, and correlation with inflammatory markers.Genomics of Obesity and AFWe are at the frontier of integrating genomics in the examination of the relation of obesity and AF.Case ConclusionThe patient, now 70 years of age, regained his previous weight. He reported continued dyspnea and daytime drowsiness. He underwent polysomnography that diagnosed OSA and during which he was in continuous AF. Anticoagulation for stroke prevention was continued. He was taken off sotalol, given his persistent AF while on the medication, and referred for electrophysiological ablation to treat symptomatic AF.Sources of FundingDr Magnani is supported by American Heart Association award 09FTF2190028. Dr Hylek is supported by National Institutes of Health (NIH) grant R01NS070307. Dr Apovian is supported by NIH grant P30DK046200.DisclosuresDr Apovian has participated on advisory boards for Amylin Pharmaceuticals, Orexigen Therapeutics, Merck & Co., Inc., Johnson and Johnson, Arena Pharmaceuticals, Nutrisystem, Inc., Zafgen Inc. and sanofi-aventis US LLC, and has received research funding from Eli Lilly & Co., Amylin Pharmaceuticals, Pfizer, Inc., sanofi-aventis US LLC, Orexigen Therapeutics, MetaProteomics LLC, and the Dr Robert C. and Veronica Atkins Foundation. The other authors report no conflicts.FootnotesCorrespondence to Jared W. Magnani, MD, MSc, Section of Cardiovascular Medicine, Boston University School of Medicine, 88 E. 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July 23, 2013Vol 128, Issue 4 Advertisement Article InformationMetrics © 2013 American Heart Association, Inc.https://doi.org/10.1161/CIRCULATIONAHA.113.001840PMID: 23877062 Originally publishedJuly 23, 2013 Keywordsatrial fibrillationriskobesityepidemiologyPDF download Advertisement SubjectsArrhythmiasEpidemiologyObesity
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