Introduction: Acute heart failure is significant source of morbidity, mortality, and resource utilization in both children and adults. Previous studies suggest there is increased morbidity, mortality, and cost in pediatric compared to adult hospitalizations. However, there are few data on the differences in heart failure prevalence or outcomes in the emergency department (ED). Hypothesis: Pediatric heart failure related (HFR) ED visits are more commonly associated with congenital heart disease (CHD), have increased charges, and more frequent hospitalizations compared to adult HFR ED visits. Methods: A retrospective analysis of the Nationwide Emergency Department Sample from 2010 was performed to assess HFR ED visits in pediatric (age # 18 years) and adult (age O 18 years) patients and compare factors associated with hospital admission, morbidity, mortality, and resource utilization. Results: 982,525 adult and 1,299 pediatric HFR ED visits were identified. Pediatric HFR ED visits were more likely at a metropolitan teaching hospital (72.9% vs 38.9%; p!0.001) and have a primary payer of Medicaid (62.8% vs 8.6%; p!0.001) compared to adult HFR ED visits. CHD was more common (42% vs 0.4%; p! 0.001) and cardiomyopathy was similar (14% vs 12%; p50.160) in pediatric vs adult HFR ED visits. Comorbidities of renal failure (17% vs 5%; p!0.001) and arrhythmias (37% vs 15%; p!0.001) were more common among adults; pulmonary hypertension was more common among pediatric patients (12% vs 9%; p50.002). Adults were more likely to be admitted to the hospital (72% vs 60%; p!0.001) and incur greater charges in the ED (median $1,611 interquartile range [IQR] $1,011 to $2,554 vs median $1,460, IQR $861 to $2,038; p!0.001) compared to pediatric patients, but pediatric patients incurred more charges if admitted to the hospital (median $38,400, IQR $15,202 to $116,327 vs median $25,630, IQR $14,318 to $49,012; p! 0.001). The overall hospital mortality was similar among all admissions (5.6% pediatric vs 5.0% adults; p50.28) but trended toward increased mortality in pediatric cardiomyopathy vs adult cardiomyopathy patients (7.6% vs 4.4%; p50.06). Conclusions: Pediatric and adult HFR ED visits usually lead to hospital admission and are frequently associated with comorbidities. Pediatric patients were more likely to be cared for at metropolitan teaching hospitals, have CHD, and less likely to be admitted to the hospital. However, when pediatric patents were admitted to the hospital, they incurred greater charges compared to adults. Further study is needed to improve care and resource utilization in this complex population.