Wide complex tachycardia is a quite common rhythm found in ECG. Basicly there are 3 arrhytmia that can cause wide QRS complex tachycardia, which are: Ventricle tachycardia (VT) which is the most common (80%), Supraventricular tachycardia (SVT) with abberancy (15-20%), and Atrioventriculare Reentrant Tacycardia (AVRT) with antidromic conduction (1–6 %). Correct diagnosis in differentiating SVT with aberancy and VT is important, due to the different patophysiology and different mechanism they present. Thus the therapy and management will be different, and miss treatment proven to be fatal. Since ECG is still the main modality to provide the diagnosis in wide QRS complex tachycardia, many effort were done including the creation of alg...