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Background: Limited data exists to evaluate the optimal management of outpatient beta blocker therapy when patients with heart failure with reduced ejection fraction (HFrEF) are admitted for acute decompensated heart failure (ADHF). Objective: This study aimed to compare the effects of holding or decreasing the dose of outpatient beta blocker therapy vs continuation of therapy on rates of tachyarrhythmias during admission for ADHF. Methods: This single-center, retrospective cohort study divided patients with HFrEF (left ventricular ejection fraction less than or equal to 40%) admitted for ADHF into two cohorts: one that had their outpatient beta blocker continued at the same dose upon admission and one that had it held or dose decreased. The primary outcome was a composite of non-sustained or sustained ventricular tachycardia, ventricular fibrillation, or atrial fibrillation or flutter with rapid ventricular response during the hospitalization. Secondary outcomes included the individual tachyarrhythmias in the primary outcome, in-hospital mortality, and 90-day re-admission for heart failure. Results: Of the 137 patients included, 82 were in the continuation cohort and 55 in the discontinuation/reduction cohort. The median length of stay was 5.3 days (interquartile range, 3.8-7.6). No significant difference in the primary composite outcome was found between the discontinuation/reduction and continuation cohorts (29.1% vs 22.0%; relative risk [95% confidence interval], 1.33 [.74-2.37]; P =.420). No significant differences were seen between the two cohorts for any of the secondary outcomes. Conclusion: Beta blocker therapy adjustment on admission for ADHF may not affect the occurrence of tachyarrhythmias in patients with HFrEF. [ABSTRACT FROM AUTHOR]