The QRS complex is irregular and coarse "fibrillatory waves" are present (see atrial fibrillation review by ... 640 ms which is quite long, but the QTc when accounting for the slow heart rate ...

Atrial fibrillation with a slow ventricular response Right bundle branch block Prolonged QT interval (with normal QTc interval) The QRS complex is irregular and coarse "fibrillatory waves" are ...