Vereckei algorithm for the diagnosis of ventricular tachycardia (VT) or supraventricular tachycardia (SVT) in a patient with wide QRS complex tachycardia

Vereckei algorithm for the diagnosis of wide complex tachycardias. In step 4, V_i represents the magnitude of voltage change in the initial 40 milliseconds of the QRS complex, while V_t represents the magnitude of voltage change in the terminal 40 milliseconds of the QRS complex. The initial V_i and terminal V_t voltages should be measured from the same biphasic or multiphasic QRS complex.