{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T11:28:07Z","timestamp":1786706887098,"version":"build-2736575974"},"reference-count":4,"publisher":"Radcliffe Medical Media Ltd","license":[{"start":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T00:00:00Z","timestamp":1786924800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/legalcode"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["US Cardiol"],"abstract":"<jats:p>The term \u2018cardiac electrogram\u2019 (EGM) was initially used to describe the surface ECG, but now EGMs represent the electrical potential within the immediate vicinity of a catheter (including pacemaker and implantable cardioverter defibrillator lead) within the heart. These EGMs are generated from electrodes on catheters that are placed in different regions of the heart: the right atrium, the right ventricle, in the coronary sinus, and near the His bundle. These EGMs, in conjunction with a surface ECG, can then be used to study the timing of electrical activity within the heart, as well as arrhythmias in the cardiac electrophysiology (EP) lab. The goals of this article are to give readers the basics of EGMs, the basics of cardiac EP catheters, and the placement of EP catheters in the heart, and to introduce readers to EGMs and intervals measured.<\/jats:p>","DOI":"10.15420\/usc.2026.05","type":"journal-article","created":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T10:33:25Z","timestamp":1786703605000},"source":"Crossref","is-referenced-by-count":0,"title":["Electrophysiology Laboratory Survival Guide Part 1: Electrogram Basics, Catheters, and Basic Intervals"],"prefix":"10.15420","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6198-7537","authenticated-orcid":false,"given":"Justin","family":"Haloot","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexis","family":"Tumolo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"6096","published-online":{"date-parts":[[2026,8,17]]},"reference":[{"key":"ref0","unstructured":"Sroubek J, Botzer L, Anter E. Electrogram recording and signal processing. In: Zipes DP, Jalife J, Stevenson WG, eds. Cardiac electrophysiology: from cell to bedside. 8th ed. Philadelphia: Elsevier; 2025; 1471\u201383."},{"key":"ref1","unstructured":"Zipes DP, Stevenson WG. Electrophysiological testing: tools and techniques. In: Zipes DP, Jalife J, Stevenson WG, eds. Cardiac electrophysiology: from cell to bedside. 8th ed. Philadelphia: Elsevier; 2023; 81\u2013123."},{"key":"ref2","unstructured":"Callans DJ. General principles and techniques of electrophysiologic investigation. In: Callans JD, ed. Josephson\u2019s clinical cardiac electrophysiology: techniques and interpretations. 6th ed. Philadelphia: Wolters Kluwer; 2024; 1\u201366."},{"key":"ref3","doi-asserted-by":"crossref","unstructured":"Katritsis DG, Morady F. Basic intervals and atrial and ventricular conduction curves. In: Katritsis D, ed. Clinical cardiac electrophysiology. Philadelphia: Elsevier; 2022; 54\u201371.e1. https:\/\/doi.org\/10.1016\/B978-0-323-79338-4.00015-7.","DOI":"10.1016\/B978-0-323-79338-4.00015-7"}],"container-title":["US Cardiology Review"],"original-title":[],"link":[{"URL":"https:\/\/www.uscjournal.com\/articleindex\/usc.2026.05","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T10:33:27Z","timestamp":1786703607000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.uscjournal.com\/articleindex\/usc.2026.05"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,8,17]]},"references-count":4,"URL":"https:\/\/doi.org\/10.15420\/usc.2026.05","relation":{},"ISSN":["1758-3896","1758-390X"],"issn-type":[{"value":"1758-3896","type":"print"},{"value":"1758-390X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,8,17]]},"article-number":"e15"}}