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Background: Atrial fibrillation with rapid ventricular response (AFib with RVR) is an arrhythmia caused by the atria of the heart beating chaotically and irregularly and is frequently associated with worse outcomes in chronic kidney disease (CKD). We sought to investigate the length of stay (LOS) in patients presenting at the emergency department with Afib with RVR and a history of CKD. Methods: Comorbidity, clinical outcomes and length of stay (LOS) were analyzed retrospectively in a cohort of 1638 patients presenting with new-onset of Afib with RVR at the emergency department from 2013 to 2018. Patients with a history of CKD vs. no history of CKD were compared using descriptive statistics, chi-square and Mann-Whitney tests. Results: The 343 patients admitted with a history of CKD had a median [IQR] glomerular filtration rate of 42 [29.4-51], were older 76(10.4) vs. 70.4(14) years of age, p2 DS 2 -VASc score of 5[4-6] vs. 4[2-5] (P Conclusion: CKD patients admitted with new-onset of Afib with RVR required additional care and longer LOS. Prevalence of other comorbidities is higher in this population, including heart failure and hypertension (most common), and thyroid disorder and COPD (least common).