Atrial flutter in a patient population with cancer: Comparison of incidence, mortality, and readmission rates.

e23079 Background: Cardiac tachyarrhythmias are common in cancer patients. Much has been studied regarding atrial fibrillation, but the impact of atrial flutter (AFL) in different malignancies is under-studied. We aim to compare the occurrence of atrial flutter (AFL), its mortality, and readmission rates in cancer patients stratified by different types. Methods: The National Readmission Database (2016-2020) was queried to identify all-cause admissions for patients with active malignancy of any origin. The study population was divided into six subgroups based on the type of cancer (colorectal, renal, lung, breast, prostate, and hematological). Multivariate regression analysis was utilized for adjusted odds of mortality. A propensity score matching (PSM) model matched malignancy of interest with other malignancies to obtain incidence rates. Results: Among 10.6 million all-cause cancer-related hospitalizations, about 0.4% developed AFL. After propensity matching, when compared to other malignancies, AFL had the highest incidence in hospitalizations associated with lung malignancies (0.75%), followed by hematological (0.66%), prostrate (0.57%), renal (0.49%), colorectal (0.38%) and breast (0.31%) malignancies p < 0.05. Moreover, cancer hospitalizations complicated by AFL were associated with higher mortality. AFL was associated with the highest odds of mortality in colorectal malignancies (aOR:2.80), followed by hematological (aOR:2.67), renal (aOR:2.66), lung (aOR:2.22), breast (aOR:2.12), & prostate (aOR:1.76) malignancies p < 0.001. AFL was also associated with frequent readmissions in cancer patients. The rates of 30-day AFL-related recurrent admission were highest in lung malignancies (18.3%), followed by hematological (18%), renal (16.6%), prostate (15.1%), colorectal (14.7%) & breast (14.2%) malignancies p < 0.05. Conclusions: The incidence of AFL in nationwide hospitalizations among cancer patients was ~ 0.4%. AFL was found to have the highest incidence and readmission rates in lung malignancies, while AFL-related mortality was highest in colorectal malignancies.