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      Analysis of the P Wave with Signal Averaging to Assess the Risk of Atrial Fibrillation after Coronary Artery Bypass Surgery

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          P wave signal averaging was performed in 91 consecutive patients undergoing coronary artery bypass grafting to detect patients at risk of postoperative atrial fibrillation (AF). Sixteen patients (17.5%) developed AF after surgery. The P wave duration on the signal-averaged electrocardiogram (ECG) and on surface ECG was prolonged in AF patients compared to others (respectively 141 ± 12 vs. 132 ± 12 ms and 124 ± 9 vs. 113 ± 9 ms). The root mean square voltages (RMS) of the total P wave were not different between the two groups; the RMS of the late portion of the P wave (late RMS) was significantly higher (0.25 ± 0.15 vs. 0.17 ± 0.10 µV) and the RMS of the first 110 ms of the P wave (early RMS) significantly lower (0.88 ± 0.28 vs. 1.09 ± 0.33 µV) in AF. The late/early RMS ratio was different (0.29 ± 0.16 vs. 0.17 ± 0.11). In a multivariate analysis only age and the late/early RMS ratio were predictive for AF.

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          Risk factors for atrial fibrillation after coronary artery bypass grafting.


            Author and article information

            S. Karger AG
            December 1997
            11 December 1997
            : 89
            : 1
            : 19-24
            Departments of a Cardiology and b Cardiac Surgery, University Hospital Ghent, Belgium
            6738 Cardiology 1998;89:19–24
            © 1998 S. Karger AG, Basel

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            Page count
            Figures: 4, Tables: 2, References: 17, Pages: 6
            Arrhythmias, Electrophysiology and Electrocardiography


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