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ABSTRACT Objective This study aimed to provide a long-term follow-up of PRKAG2 syndrome and describe the new phenotypic aspects of the condition. PRKAG2 syndrome is a rare autosomal-dominant glycogen storage disease characterized by cardiac hypertrophy, ventricular pre-excitation, and conduction system disease. Fatal arrhythmias occur frequently. Methods A family cohort of 66 participants was recruited. Clinical and genetic analyses were performed. Results Median age of 36.97±17.28 years, with 69.9% being men. Nineteen subjects carried the deleterious variant p.K290I of the PRKAG2 gene. This group experienced many malignant events, including eight pacemaker implants, three sudden cardiac deaths, five aborted cardiac arrests, four strokes, four premature neonatal deaths, two spontaneous abortions, five forceps deliveries, and 12 cesarean procedures. Extracardiac involvement, such as in neurocognitive and psychiatric disorders, has been observed only in carriers of mutations. Palpitations, Syncope, atrial fibrillation, atrial flutter, sinus pauses, and bradycardia were strongly and significantly associated with major or severe adverse events (sudden cardiac death, aborted cardiac arrest, pacemaker use, stroke, and congestive heart failure). Early diagnosis and intervention through antiarrhythmic drugs, anticoagulation, pacemaker implantation, radiofrequency catheter ablation, and cesarean section surgery improved the symptoms and survival rates. Mutations carriers were advised to avoid pregnancy. Conclusion This study identified that the p.K291I_PRKAG2 mutation is associated with poor prognosis, highlighting the need for early intervention. Further research may uncover the potential connections between intellectual disability, miscarriage, and neonatal death in individuals with this syndrome. longterm long term followup follow up PRKAG condition autosomaldominant autosomal dominant hypertrophy preexcitation, preexcitation pre excitation, excitation pre-excitation frequently 6 recruited performed 36971728 36 97 17 28 36.97±17.2 years 699 69 9 69.9 men pK290I pKI p K290I K I gene implants deaths arrests strokes abortions deliveries 1 procedures involvement disorders mutations Palpitations Syncope fibrillation flutter pauses arrest use stroke failure. failure . failure) drugs anticoagulation implantation ablation rates pregnancy pK291IPRKAG2 pKIPRKAG K291I p.K291I_PRKAG prognosis disability miscarriage 3697172 3 2 36.97±17. 69. pK KI IPRKAG pK291IPRKAG 369717 36.97±17 36971 36.97±1 3697 36.97± 369 36.97 36.9 36.