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Heart rate variability and early recurrence of atrial fibrillation after electrical cardioversion

Federico Lombardi, MD, FESC^*, Andrea Colombo, MD^*, Barbara Basilico, MD^*, Romana Ravaglia, MD^*, Massimo Garbin, MD^*, Daniele Vergani, MD^*, Pier Maria Battezzati, MD and Cesare Fiorentini, MD^*

^* Cardiologia, Dipartimento di Medicina, Chirurgia e Odontoiatria, Ospedale S. Paolo, Università degli Studi di Milano, Milan, Italy
Medicina Interna, Dipartimento di Medicina, Chirurgia e Odontoiatria, Ospedale S. Paolo, Università degli Studi di Milano, Milan, Italy

View larger version (17K): [in a new window]   Figure 1 Schematic representation of atrial fibrillation (AF) recurrence during six-month follow-up period.

View larger version (17K): [in a new window]   Figure 2 Receiver operating characteristic (ROC) curve for LF/HF ratio in prediction of atrial fibrillation recurrence. Point A indicates LF/HF ratio value equal to 2; point B (LF/HF ratio of 2.2) represents the value that minimizes classification errors. LF/HF = low frequency/high frequency.

View larger version (19K): [in a new window]   Figure 3 Percent (%) recurrence of atrial fibrillation (AF) in relation to the selected cutoff value of LF/HF ratio. Numbers of patients at risk for LF/HF ratio 2 and <2 are shown in the abscissa. LF = low frequency; HF = high-frequency component of heart rate variability.