[Ventricular tachycardia with narrow QRS complex after cardiac surgery]

We present new-onset sustained monomorphic ventricular tachycardia with relatively narrow QRS (width of QRS feminine 120 ms) in the recovery period after aortic valve replacement and surgical revascularisation in a patient with a prior inferior wall myocardial infarction. Ventricular tachycardia probably originating from the left-side His-Purkinje system and mimicking idiopathic posterior fascicular tachycardia was diagnosed. Placement of a bypass graft across occluded artery supplying an infarct zone was a potential trigger of this arrhythmia.