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. 2020 Dec 16;48(12):0300060520977634. doi: 10.1177/0300060520977634

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© The Author(s) 2020

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 3. — Representative recordings showing the use of a notched unipolar electrogram (N-uniEGM) in the ablation of premature ventricular contractions originating from the right ventricular outflow tract (RVOT-PVC). (A) 12-lead surface electrocardiograms of sinus rhythm (SR), PVC and pacing. In this patient, the surface electrocardiogram indicated that the PVC originated from the RVOT. (B) Activation mapping of the origin of the PVC in the RVOT using the CARTO^® 3 System with simultaneous recordings of surface electrocardiogram, unipolar and bipolar electrograms. The earliest ventricular activation (EVA) site was proved to be located near the anterior septum of the RVOT by 3-dimensional electroanatomic mapping. Pacing mapping morphology at this site coincided perfectly with the spontaneous PVC. An N-uniEGM was also recorded at the EVA. Radiofrequency energy delivery for 2 s at this site terminated the clinical PVC. The colour version of this figure is available at: http://imr.sagepub.com.