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Here, we introduce a standalone bioadhesive hydrogel battery\u2010enabled electroceutical device that seamlessly interfaces with cardiac tissue, enabling rapid electrochemical modulation of cardiac rhythm. Constructed from dynamic supermolecular hydrogels, the device achieves strong electrode\u2013electrolyte adhesion and suture\u2010free integration with biological tissue (adhesion energy &gt; 200 J m\n                    <jats:sup>\u22122<\/jats:sup>\n                    ). It provides stable in vivo voltage outputs (0.90\u20131.17\u00a0V) for 14 days while suppressing immune response as indicated by downregulating inflammatory biomarkers. The battery discharge enhances cardiomyocyte contraction, promotes cell junction protein expression, and mediates cardiac arrhythmias in ex vivo rat hearts. Adhering directly to the myocardium without surgical fixation, the device generates sustained electrical stimulation for bradycardia correction and low\u2010energy defibrillation, restoring sinus rhythm within seconds (5\u201310 s) in a rat model. This tissue\u2010integrated electroceutical offers a promising alternative during cardiac surgery to treat arrhythmia by enhancing tissue integration and minimizing foreign\u2010body response.\n                  <\/jats:p>","DOI":"10.1002\/adma.74488","type":"journal-article","created":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T13:22:15Z","timestamp":1785849735000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Tissue\u2010Integrated Hydrogel Battery\u2010Enabled Electroceutical for Cardiac Arrhythmia Management"],"prefix":"10.1002","volume":"38","author":[{"given":"Runan","family":"Li","sequence":"first","affiliation":[{"name":"State Key Laboratory of Integrated Optoelectronics JLU Region College of Electronic Science and Engineering Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yiran","family":"Wang","sequence":"additional","affiliation":[{"name":"The Second Hospital of Jilin University Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meiying","family":"Xin","sequence":"additional","affiliation":[{"name":"Department of Pediatric Neurology Children's Medical Center The First Hospital of Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuemei","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Pediatric Neurology Children's Medical Center The First Hospital of Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Zhou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Integrated Optoelectronics JLU Region College of Electronic Science and Engineering Jilin University  Changchun 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