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Diaphragmatic weakness in DMD causes hypoventilation and elevated afterload on the right ventricle (RV). Thus, RV dysfunction in DMD develops early in disease progression. Herein, we deliver a 30\u2010min sustained RV preload\/afterload challenge to isolated hearts of wild\u2010type (Wt) and dystrophic (Dmd<jats:sup>mdx\u20104Cv<\/jats:sup>) mice at both young (2\u20136\u2009month) and middle\u2010age (8\u201312\u2009month) to test the hypothesis that the dystrophic RV is susceptible to dysfunction with elevated load. Young dystrophic hearts exhibited greater pressure development than wild type under baseline (Langendorff) conditions, but following RV challenge exhibited similar contractile function as wild type. Following the RV challenge, young dystrophic hearts had an increased incidence of premature ventricular contractions (PVCs) compared to wild type. Hearts of middle\u2010aged wild\u2010type and dystrophic mice had similar contractile function during baseline conditions. After RV challenge, hearts of middle\u2010aged dystrophic mice had severe RV dysfunction and arrhythmias, including ventricular tachycardia. Following the RV load challenge, dystrophic hearts had greater lactate dehydrogenase (LDH) release than wild\u2010type mice indicative of damage. Our data indicate age\u2010dependent changes in RV function with load in dystrophin deficiency, highlighting the need to avoid sustained RV load to forestall dysfunction and arrhythmia.<\/jats:p>","DOI":"10.14814\/phy2.16004","type":"journal-article","created":{"date-parts":[[2024,4,25]],"date-time":"2024-04-25T02:29:30Z","timestamp":1714012170000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Right ventricular preload and afterload challenge induces contractile dysfunction and arrhythmia in isolated hearts of dystrophin\u2010deficient male mice"],"prefix":"10.14814","volume":"12","author":[{"given":"Andrew","family":"Behrmann","sequence":"first","affiliation":[{"name":"Medical Pharmacology and Physiology University of Missouri  Columbia Missouri USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jessica","family":"Cayton","sequence":"additional","affiliation":[{"name":"Department of Veterinary 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