Impact of Atrial Fibrillation on Inpatient Outcomes among Hospitalized Patients with Multiple Myeloma.

Background Though multiple myeloma (MM) patients have been reported to have the highest risk of atrial fibrillation compared to other cancer patients, studies are lacking on the impact of atrial fibrillation on health outcomes in this population. In this study, we examined the impact of atrial fibrillation on inpatient outcomes among hospitalized patients with MM. Methodology Retrospective cohort analyses were conducted using National Inpatient Sample data from 2016 to 2018. Descriptive analyses were performed to explore the prevalence of atrial fibrillation among MM patients. Multivariable logistic and linear regression models were used to examine the association between atrial fibrillation and inpatient all-cause mortality, length of stay, and total hospital charges among hospitalized patients with MM. Results Overall, 13.1% of the patients reported having atrial fibrillation. MM patients with atrial fibrillation had 1.2 times (adjusted odds ratio (AOR) = 1.16; 95% confidence interval (CI) = 1.05-1.29) higher odds of inpatient all-cause mortality when compared to those without atrial fibrillation. They were also 1.3 times (AOR = 1.29; 95% CI = 1.23-1.35) more likely to have a length of stay of more than five days relative to five days or less. Additionally, MM patients with atrial fibrillation had $8,020 (95% CI = $5,495.2-$10,546.3) higher hospital costs when compared to their counterparts without atrial fibrillation. Stratified results by the use of anticoagulation further showed that MM patients who were not using anticoagulation had bad health outcomes, reporting higher odds of inpatient all-cause mortality (AOR = 1.40; 95% CI = 1.25-1.57), a longer length of hospital stay of more than five days (AOR = 1.44; 95% CI = 1.36-1.53), and total hospital charges (beta = $14,772.5; 95% CI = $11,467.8-$18,077.3). Conclusions Our findings stress the need for monitoring and possible screening to detect atrial fibrillation in MM patients as anticoagulation helps improve mortality in these patients. Medication reconciliation remains a key component of hospital admissions/discharges and may help in decreasing the length of stay and healthcare costs.