The electrocardiogram of ventricular tachycardia and supraventricular tachycardia can be differentiated by ventricular rate, QRS wave morphology, and atrial separation. Ventricular tachycardia is defined as a tachycardia that originates below the branches of the ventricular Hirschsprung’s bundle, and supraventricular tachycardia is defined as a tachycardia that originates above the branches of the ventricular Hirschsprung’s bundle. The heart rate is approximately 140 to 200 beats per minute in ventricular tachycardia ECGs and 160 to 250 beats per minute in supraventricular tachycardia ECGs. Ventricular tachycardia electrocardiograms have an aberrant QRS wave pattern with a time limit of greater than 0.12 seconds, and ST-T waves that are oriented in the opposite direction of the main wave. Supraventricular tachycardia electrocardiograms usually have normal QRS wave morphology and time frames, but can be morphologically abnormal in the presence of bundle branch block. In ventricular tachycardia, the activity of the central atrium is independent of the QRS wave, creating an atrioventricular separation, and in supraventricular tachycardia, the activity of the central atrium remains fixed in relation to the QRS wave. The ventricular tachycardia ECG has features not found in the supraventricular tachycardia ECG, i.e., ventricular capture and ventricular fusion waves. These are some of the ECG differences between these two types of tachycardia, and the specific identification needs to be performed by a medical professional.