In this situation, the ventricular (QRS ... with atrial flutter helps to distinguish it from atrial fibrillation, though atrial flutter with variable conduction of the P waves can also occur.

Atrial flutter is similar to atrial fibrillation ... This paradoxical increase in ventricular heart rates may lead to ventricular fibrillation (ventricular rates of 400 to 600 bpm) and death.

An implantable cardioverter defibrillator (ICD) was implanted for a positive (inducible monomorphic VT) but not a negative (no arrhythmia or inducible ventricular fibrillation [VF]/flutter ...