Activation mapping is used to guide ablation of idiopathic outflow tract ventricular arrhythmias (OTVAs). Isochronal activation maps help to predict the site of origin (SOO): left vs right outflow tract. This method is crucial in identifying the correct site for ablation, reducing the risk of complications and improving patient outcomes. The use of activation mapping has been shown to be effective in treating OTVAs, and its application has been expanding to other types of arrhythmias. By understanding the electrical activity of the heart, clinicians can make more informed decisions about treatment options and improve patient care.