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A better understanding of the molecular and cellular basis of arrhythmia mechanisms is necessary for the development of better treatment modalities. To aid these efforts, various mouse models have been developed for studying cardiac arrhythmias. Both genetic and surgical mouse models are commonly used to assess the incidence and mechanisms of arrhythmias. Since spontaneous arrhythmias are uncommon in healthy young mice, intracardiac programmed electrical stimulation (PES) can be performed to assess the susceptibility to pacing\u2010induced arrhythmias and uncover the possible presence of a proarrhythmogenic substrate. This procedure is performed by positioning an octopolar catheter inside the right atrium and ventricle of the heart through the right jugular vein. PES can provide insights into atrial and ventricular electrical activity and reveal whether atrial and\/or ventricular arrhythmias are present or can be induced. Here, we explain detailed procedures used to perform this technique, possible troubleshooting scenarios, and methods to interpret the results obtained. \u00a9 2024 Wiley Periodicals LLC.<\/jats:p>\n                  <jats:p>\n                    <jats:bold>Basic Protocol<\/jats:bold>\n                    : Programmed electrical stimulation in mice\n                  <\/jats:p>","DOI":"10.1002\/cpz1.994","type":"journal-article","created":{"date-parts":[[2024,2,19]],"date-time":"2024-02-19T06:28:35Z","timestamp":1708324115000},"source":"Crossref","is-referenced-by-count":4,"title":["In Vivo Cardiac Electrophysiology in Mice: Determination of Atrial and Ventricular Arrhythmic Substrates"],"prefix":"10.1002","volume":"4","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0317-4888","authenticated-orcid":false,"given":"Jose Alberto","family":"Navarro\u2010Garcia","sequence":"first","affiliation":[{"name":"Cardiovascular Research Institute Baylor College of Medicine  Houston 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