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. 2017 Jan 26;8:14. doi: 10.3389/fphys.2017.00014

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Copyright © 2017 Nagase, Tanaka, Morita, Nakagawa, Wada, Murakami, Nishii, Nakamura, Ito, Ohe and Kusano.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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ECG and epicardial electrograms in two control subjects. (A,B) ECG without ER pattern and LV epicardial electrograms of a 39-year-old male control subject with supraventricular tachycardia. No apparent J wave was recorded on unipolar recording (Epi 2) and no potential was recorded after the QRS complex on bipolar recording (Epi 2-3) in the left lateral coronary vein. (C,D) ECG and LV epicardial electrograms of a 25-year-old male control subject with neutrally mediated syncope. ECG revealed inferior and lateral ERs (arrows). No apparent J wave was recorded on unipolar recording (Epi 2, 3).