30- [25]VISIT HRS 31: [26]NEWS FROM THE HEART RHYTHM SOCIETY 32- [27]RSS RSS -- 219- inhomogeneity in conduction velocity and calls upon further elucidation 220: of the concept. Thus, we tested the hypothesis that cardiac rhythm 221- characteristics preceding ischemic VF are different from those in -- 404- ECG characteristics are listed in [123]Table 2. All patients were in 405: sinus rhythm, except for six (four VF patients, two controls) with 406- atrial fibrillation, which precluded assessment of sinus rate and PR 407: interval. One VF patient had a paced rhythm during part of the Holter 408- recording. One VF patient and two control patients showed -- 572- the mere presence of ventricular ectopic beats is less important than 573: rhythm irregularity. 574- -- 605- HRV were specifically designed to measure this parameter for 606: sufficiently long periods of sinus rhythm in a chronic care setting. 607- -- 743- ventricular fibrillation in ST elevation myocardial infarction are 744: related to the culprit artery. Heart Rhythm. 2008;1:71-78. 745- -- 854- 855: © 2010 Heart Rhythm Society. Published by Elsevier Inc. All rights 856- reserved.