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Introduction The quality of electrograms (EGMs) determines an electrophysiologist’s ability to interpret data. Nevertheless, there are a myriad of factors that influence the quality of EGMs. Consequently, it is important to have a basic knowledge of the recording circuitry and…

Key Points Ventricular outflow tract tachycardias include the right or left ventricular (LV) outflow tracts, aortic cusps, pulmonary artery, and the corresponding epicardium (LV summit region). The mechanism underlying outflow tract arrhythmias is usually triggered activity, and the site of…