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Schram Serban C, de Groot NMS. Impact of Obesity on Atrial Electrophysiological Substrate. J Cardiovasc Dev Dis 2023; 10:342. [PMID: 37623355 PMCID: PMC10455641 DOI: 10.3390/jcdd10080342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 07/31/2023] [Accepted: 08/07/2023] [Indexed: 08/26/2023] Open
Abstract
(1) Background. Obesity is a well-established worldwide recognised risk factor for atrial fibrillation (AF). Prior review papers reported on the associations between obesity and AF development, but not on the relation between obesity and atrial electrophysiology. We therefore conducted a systematic review to describe the current knowledge of the characteristics of the atrial electrophysiological substrate in obese individuals and how they relate to the development of AF. (2) Methods. A search was conducted in Pubmed, Embase, and the Cochrane Library for publications evaluating the impact of obesity on atrial electrophysiology, electrical substrates, and their relation to the development of AF. (3) Results. A systematic literature search retrieved 477 potential publications based on the inclusion criteria; 76 full-text articles were selected for the present systematic review. The literature demonstrated that obesity predisposes to not only a higher AF incidence but also to more extensive atrial electrophysiological abnormalities increasing susceptibility to AF development. (4) Conclusion. Obesity may predispose to an overall increase in atrial electropathology, consisting of an increase in the slowing of the conduction, conduction block, low-voltage areas, and complex fractionated electrograms. To determine the impact of obesity-induced atrial electrical abnormalities on the long-term clinical outcome, further prospective studies are mandatory.
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Affiliation(s)
- Corina Schram Serban
- Department of Cardiology, Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands;
| | - Natasja M. S. de Groot
- Department of Cardiology, Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands;
- Department of Microelectronics, Circuits and Systems, Faculty of Electrical Engineering, Mathematics and Computer Sciences, Delft University of Technology, 2628 CD Delft, The Netherlands
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Schram-Serban C, Heida A, Roos-Serote MC, Knops P, Kik C, Brundel B, Bogers AJJC, de Groot NMS. Heterogeneity in Conduction Underlies Obesity-Related Atrial Fibrillation Vulnerability. Circ Arrhythm Electrophysiol 2020; 13:e008161. [PMID: 32301327 DOI: 10.1161/circep.119.008161] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Obese patients are more vulnerable to development of atrial fibrillation but pathophysiology underlying this relation is only partly understood. The aim of this study is to compare the severity and extensiveness of conduction disorders between obese patients and nonobese patients measured at a high-resolution scale. METHODS Patients (N=212) undergoing cardiac surgery (male:161, 63±11 years) underwent epicardial mapping of the right atrium, Bachmann bundle, and left atrium during sinus rhythm. Conduction delay (CD) was defined as interelectrode conduction time of 7 to 11 ms and conduction block (CB) as conduction time ≥12 ms. Prevalence of CD/CB, continuous CDCB (cCDCB), length of CD/CB/cCDCB lines, and severity of CB were analyzed. RESULTS In obese patients, the overall incidence of CD (3.1% versus 2.6%; P=0.002), CB (1.8% versus 1.2%; P<0.001), and cCDCB (2.6% versus 1.9%; P<0.001) was higher and CD (P=0.012) and cCDCB (P<0.001) lines are longer. There were more conduction disorders at Bachmann bundle and this area has a higher incidence of CD (4.4% versus 3.3%, P=0.002), CB (3.1% versus 1.6%, P<0.001), cCDCB (4.6% versus 2.7%, P<0.001) and longer CD (P<0.001) or cCDCB (P=0.017) lines. The severity of CB is also higher, particularly in the Bachmann bundle (P=0.008) and pulmonary vein (P=0.020) areas. In addition, obese patients have a higher incidence of early de-novo postoperative atrial fibrillation (P=0.003). Body mass index (P=0.037) and the overall amount of CB (P=0.012) were independent predictors for incidence of early postoperative atrial fibrillation. CONCLUSIONS Compared with nonobese patients, obese patients have higher incidences of conduction disorders, which are also more extensive and more severe. These differences in heterogeneity in conduction are already present during sinus rhythm and may explain the higher vulnerability to atrial fibrillation of obese patients.
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Affiliation(s)
- Corina Schram-Serban
- Department of Cardiology (C.S.-S., A.H., M.C.R.-S., P.K., N.M.S.d.G.), Erasmus University Medical Center, Rotterdam
| | - Annejet Heida
- Department of Cardiology (C.S.-S., A.H., M.C.R.-S., P.K., N.M.S.d.G.), Erasmus University Medical Center, Rotterdam
| | - Maarten C Roos-Serote
- Department of Cardiology (C.S.-S., A.H., M.C.R.-S., P.K., N.M.S.d.G.), Erasmus University Medical Center, Rotterdam
| | - Paul Knops
- Department of Cardiology (C.S.-S., A.H., M.C.R.-S., P.K., N.M.S.d.G.), Erasmus University Medical Center, Rotterdam
| | - Charles Kik
- Department of Cardio-Thoracic Surgery (C.K., A.J.J.C.B.), Erasmus University Medical Center, Rotterdam
| | - Bianca Brundel
- Department of Physiology, Amsterdam UMC, Vrije Universiteit Amsterdam (B.B.).,Cardiovascular Sciences, Amsterdam, The Netherlands (B.B.)
| | - Ad J J C Bogers
- Department of Cardio-Thoracic Surgery (C.K., A.J.J.C.B.), Erasmus University Medical Center, Rotterdam
| | - Natasja M S de Groot
- Department of Cardiology (C.S.-S., A.H., M.C.R.-S., P.K., N.M.S.d.G.), Erasmus University Medical Center, Rotterdam
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Serban C, Arinze JT, Starreveld R, Lanters EAH, Yaksh A, Kik C, Acardag Y, Knops P, Bogers AJJC, de Groot NMS. The impact of obesity on early postoperative atrial fibrillation burden. J Thorac Cardiovasc Surg 2019; 159:930-938.e2. [PMID: 31043315 DOI: 10.1016/j.jtcvs.2019.03.073] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 03/15/2019] [Accepted: 03/18/2019] [Indexed: 01/02/2023]
Abstract
BACKGROUND Obesity has been linked to the development of postoperative atrial fibrillation. This study is aimed at investigating the role of body mass index in the evolution of de novo, early postoperative atrial fibrillation by assessing differences between obese and nonobese patients undergoing cardiac surgery. METHODS Patients with early de novo postoperative atrial fibrillation were included. Continuous cardiac rhythms were recorded during the first 5 postoperative days in obese (N = 67, 66 ± 9 years; 51 [76%] male) and nonobese (N = 89, 69 ± 9; 75 [84%] male) patients without a history of atrial fibrillation undergoing cardiac surgery. Postoperative atrial fibrillation burden was defined as the ratio between total duration of all atrial fibrillation episodes and total recording time (atrial fibrillation burden, %). RESULTS A total of 1191 (median: 5/patient) postoperative atrial fibrillation episodes were identified in the obese group compared with 1218 (median: 4/patient) in the nonobese group. The median duration and number of prolonged (>60 minutes) postoperative atrial fibrillation episodes were higher in obese patients (250 vs 145 minutes, P = .003, and median of 2 vs 1 episode, P = .031). Obesity was associated with a larger early postoperative atrial fibrillation burden (obese patients: median, 7%; interquartile range, 2.5-19.7 vs nonobese patients: median, 3.2%; interquartile range, 0.5-8.8, P = .001) mainly on the third postoperative day (P = .021). CONCLUSIONS Obesity predisposes to a larger number of prolonged atrial fibrillation episodes in the early postoperative period after cardiac surgery for coronary artery disease or valvular heart disease. The higher atrial fibrillation burden in the early postoperative period occurred particularly on the third day. Future studies will determine whether obesity prevention may play a key role in reducing the incidence of postoperative atrial fibrillation in patients undergoing cardiac surgery.
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Affiliation(s)
- Corina Serban
- Department of Cardiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Johnmary T Arinze
- Department of Cardiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Roeliene Starreveld
- Department of Cardiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Eva A H Lanters
- Department of Cardiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Ameeta Yaksh
- Department of Cardiology, Radboud University, Nijmegen, The Netherlands
| | - Charles Kik
- Department of Cardiothoracic Surgery, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Yalin Acardag
- Department of Cardiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Paul Knops
- Department of Cardiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Ad J J C Bogers
- Department of Cardiothoracic Surgery, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Natasja M S de Groot
- Department of Cardiology, Erasmus University Medical Center, Rotterdam, The Netherlands.
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Miwa Y, Minamiguchi H, Bhandari AK, Cannom DS, Ho IC. Amiodarone reduces the amount of ablation during catheter ablation for persistent atrial fibrillation. Europace 2014; 16:1007-14. [PMID: 24446509 DOI: 10.1093/europace/eut399] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
AIMS The step-wise approach to catheter ablation for persistent atrial fibrillation (AF) requires considerable substrate modification targeting at complex fractionated atrial electrograms (CFAEs) in addition to pulmonary vein (PV) isolation. An alternative strategy that minimizes the amount of ablation would be desirable. The aim of this study was to investigate whether the use of pre-procedural amiodarone affects: (i) the amount of ablation required to achieve procedural success, and (ii) long-term outcomes. METHODS AND RESULTS We studied 121 consecutive patients with persistent AF who underwent catheter ablation. The patients were divided into two groups: Group 1, amiodarone (n = 31); Group 2, other antiarrhythmic drugs or rate control (n = 90). All the patients underwent a step-wise ablation procedure beginning with PV isolation, then proceeding with ablation of the CFAEs and linear lesions until sinus rhythm was achieved. Mean left atrial cycle length of AF (AFCL) was recorded at each step. The number of CFAE ablation sites was recorded. The number of CFAE sites in Group 1 was significantly less than that in Group 2 (P = 0.0121). The AFCLs after each step in Group 1 were significantly longer than those in Group 2. The procedure time and the radiofrequency time of CFAE ablation in Group 1 were significantly shorter than that in Group 2 (P = 0.0276 and P = 0.0458, respectively). There was no significant difference between the two groups in early and long-term outcomes. CONCLUSION Use of pre-procedural amiodarone prolongs AFCL during catheter ablation and reduces the number of CFAE sites requiring ablation to achieve procedural success while maintaining equivalent long-term results.
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Affiliation(s)
- Yosuke Miwa
- Department of Cardiology, Good Samaritan Hospital, 1225 Wilshire Boulevard, Third floor, Los Angeles, CA 90017, USA
| | - Hitoshi Minamiguchi
- Department of Cardiology, Good Samaritan Hospital, 1225 Wilshire Boulevard, Third floor, Los Angeles, CA 90017, USA
| | - Anil K Bhandari
- Department of Cardiology, Good Samaritan Hospital, 1225 Wilshire Boulevard, Third floor, Los Angeles, CA 90017, USA
| | - David S Cannom
- Department of Cardiology, Good Samaritan Hospital, 1225 Wilshire Boulevard, Third floor, Los Angeles, CA 90017, USA
| | - Ivan C Ho
- Department of Cardiology, Good Samaritan Hospital, 1225 Wilshire Boulevard, Third floor, Los Angeles, CA 90017, USA
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Yoshiga Y, Shimizu A, Yamagata T, Esato M, Ueyama T, Ohmura M, Itagaki K, Kimura M, Kakugawa H, Doi M, Matsuzaki M. Effects of flecainide on the electrophysiological properties of atrial vulnerability in humans. Circ J 2003; 67:437-42. [PMID: 12736484 DOI: 10.1253/circj.67.437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The aims of this study were to evaluate the changes in the electrophysiological characteristics of the right atrium after the administration of flecainide and to clarify whether flecainide has a selective effect on human atrial tissue. Electrophysiological measurements were made in 38 patients, before and after intravenous administration of flecainide (2 mg/kg per 10 min). The effective refractory period of the right atrium (ERP-A), maximum conduction delay (Max.CD), repetitive atrial firing zone (RAFZ), fragmented atrial activity zone (FAAZ), and conduction delay zone (CDZ) were studied in the patients who were divided into 2 groups based on whether repetitive atrial firing (RAF) was induced in the baseline study. Flecainide significantly prolonged the ERP-A (202+/-22 to 238+/-33 ms, p<0.001) and shortened Max.CD (77+/-17 to 63+/-32 ms, p<0.05) in the patients with RAF, but not in those without RAF in the baseline study. After flecainide administration, there were significant reductions in the RAFZ (43+/-22 to 13+/-19 ms, p<0.0001), FAAZ (51+/-22 to 28+/-26 ms, p<0.001) and CDZ (70+/-21 to 48+/-30 ms, p<0.01) in the patients with RAF. However, atrial fibrillation (AF) was induced by stimulation after flecainide in 2 patients without RAF in the baseline study. There was a significant negative correlation between the ERP-A in the baseline study and the change in the ERP-A upon flecainide administration (r=0.45, p<0.01). Flecainide may preferentially activate the substrate for AF and RAF, but that action is mainly based on the electrophysiological characteristics found in the baseline study.
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Affiliation(s)
- Yasuhiro Yoshiga
- The Department of Medical Bioregulation, Faculty of Science, Yamaguchi University School of Medicine, Ube, Japan
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Assessment of right atrial mapping and P wave—triggered signal-average in patients with paroxysmal atrial fibrillation. J Electrocardiol 1999. [DOI: 10.1016/s0022-0736(99)90106-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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