Polymorphic ventricular premature contractions are those in which the excitation of premature contractions originates from different pacing points. 1. Polymorphic ventricular premature contractions present as polymorphic, and polymorphic ventricular premature contractions are not necessarily polymorphic in origin. 2. When looking to determine polymorphism, it is important to note that it is the QRS wave groups in the same leads that present different morphologies. If they are in different leads, even if they are of a single source, they may have different morphology.3. Polymorphic ventricular premature beats it is mostly seen in patients with organic heart disease, but they are usually not specific. A 24-hour ambulatory ECG must be done when polymorphic ventricular premature beats appear. Is there a degree of RONT or a ventricular tachycardia that needs to be treated promptly.