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Competing autonomic mechanisms precedethe onset of postoperative atrial fibrillation

David Amar, MD^*,*, Hao Zhang, MD^*, Saul Miodownik, MEE and Alan H. Kadish, MD

^* Departments of Department of Anesthesiology and Critical Care Medicine, New York, New York, USA
Department of Biomedical Engineering, Memorial Sloan-Kettering Cancer Center and Weill Medical College of Cornell University, New York, New York, USA
Division of Cardiology, Northwestern University School of Medicine, Chicago, Illinois, USA

View larger version (19K): [in a new window]   Figure 1 Continuous 5-min data of time-domain parameters of heart rate variability (HRV) during the 2 h preceding the onset of atrial fibrillation/flutter (AF) (filled circles) or in the corresponding study window in controls (unfilled circles). A = RR interval; B = SD; C = rMSSD; D = pNN50. See text for abbreviations. P values in the figures represent the group by time interaction results.

View larger version (15K): [in a new window]   Figure 2 Continuous 5-min data of frequency-domain parameters of HRV during the 2 h preceding the onset of AF (filled circles) or in the corresponding study window in controls (unfilled circles). A = LF; B = HF; C = LF/HF ratio. See text for abbreviations. P values in the figures represent the group by time interaction results.