Use the Brugada criteria to distinguish ventricular tachycardia from supraventricular tachycardia (SVT) with aberrancy ... inversion is stage III of the ECG changes in pericarditis.
At times it can be difficult to distinguish "SVT with aberrancy" from ventricular ... This is not the case in the QRS complex on this ECG, except for the one beat in lead V1 towards the end ...