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. 2019 Sep 3;54(19):1142–1148. doi: 10.1136/bjsports-2018-100529

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Morphologies of common premature ventricular beats in healthy athletes. Premature ventricular beat with negative QRS complex in V1 (left bundle branch block-like), precordial S/R transition in V4 and inferior QRS axis in the limb leads consistent with origin from the right ventricular outflow tract (A). Premature ventricular beat with negative QRS complex in V1 (left bundle branch block-like pattern), precordial S/R transition in V2/V3 and inferior QRS axis in the limb leads, suggestive of the origin from the left ventricular outflow tract (B). Premature ventricular beat with a relatively narrow QRS (120–130 ms) and typical right bundle branch block/superior axis configuration, suggestive of the origin from the posterior fascicle of the left bundle branch (C). Premature ventricular beat with a relatively narrow QRS (120–130 ms) and typical right bundle branch block/inferior axis configuration, suggestive of the origin from the anterior fascicle of the left bundle branch (D).