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Electrophysiological and Hemodynamic Characteristics Associated With Obesity in Patients With Atrial Fibrillation

2012; Elsevier BV; Volume: 60; Issue: 9 Linguagem: Inglês

10.1016/j.jacc.2012.03.042

1558-3597

Thomas M. Munger, Ying-Xue Dong, Mitsuru Masaki, Jae K. Oh, Sunil Mankad, Barry A. Borlaug, Samuel J. Asirvatham, Win-Kuang Shen, Hon-Chi Lee, Suzette J. Bielinski, David O. Hodge, Regina M. Herges, Traci L. Buescher, Jia-Hui Wu, Changsheng Ma, Yanhua Zhang, Peng‐Sheng Chen, Douglas L. Packer, Yong‐Mei Cha,

Cardiac pacing and defibrillation studies

The authors sought to characterize the left atrial (LA) and pulmonary vein (PV) electrophysiological and hemodynamic features in obese patients with atrial fibrillation (AF). Obesity is associated with increased risk for AF. A total of 63 consecutive patients with AF who had normal left ventricular (LV) ejection fraction and who underwent catheter ablation were studied. Atrial and PV electrophysiological studies were performed at the time of ablation with hemodynamic assessment by cardiac catheterization, and LA/LV structure and function by echocardiography. Patients were compared on the basis of body mass index (BMI): <25 kg/m2 (n = 19) and BMI ≥30 kg/m2 (n = 44). At a 600-ms pacing cycle length, obese patients had shorter effective refractory period (ERP) in the left atrium (251 ± 25 ms vs. 233 ± 32 ms, p = 0.04), and in the proximal (207 ± 33 ms vs. 248 ± 34 ms, p < 0.001) and distal (193 ± 33 ms vs. 248 ± 44 ms, p < 0.001) PV than normal BMI patients. Obese patients had higher mean LA pressure (15 ± 5 mm Hg vs. 10 ± 5 mm Hg, p < 0.001) and LA volume index (28 ± 12 ml/m2 vs. 21 ± 14 ml/m2, p = 0.006), and lower LA strain (5.5 ± 3.1% vs. 8.8 ± 2.8%; p < 0.001) than normal BMI patients. Increased LA pressure and volume, and shortened ERP in the left atrium and PV are potential factors facilitating and perpetuating AF in obese patients with AF.