There exists variability in the administration of inpatient sotalol therapy for symptomatic atrial fibrillation (AF). The impact of this variability on patient in-hospital and 30-day post-hospitalization costs and outcomes is not known. Also, the cost impact of intravenous sotalol, which can accelerate drug loading to therapeutic levels, is unknown.

133 AF patients admitted for oral sotalol initiation at an Intermountain Healthcare Hospital from January 2017-December 2018 were included. Patient and dosing characteristics were described descriptively, and the impact of dosing schedule was correlated with daily hospital costs/clinical outcomes during the index hospitalization and for 30 days. The CMS reimbursement for 3-day sotalol initiation is $9,263.51. Projections of cost savings were made considering a 1-day load using intravenous sotalol that costs $2,500.00 to administer.

The average age was 70.3±12.3 years, 60.2% were male with comorbidities of: hypertension (83%), diabetes (36%), and coronary artery disease (53%). Mean ejection fraction was 59.9±7.8% and median QTc was 453.7±37.6 ms before sotalol. No ventricular arrhythmias developed, but bradycardia (<60 bpm) was observed in 37.6% of patients. The average length of stay was 3.9±4.6 (median: 2.2) days. Post-discharge outcomes and rehospitalization rates stratified by length of stay were similar. The cost per day was estimated at $2,931.55 (1:$2,931.55, 2:$5,863.10, 3:$8,794.65, 4:$11,726.20).

Inpatient oral sotalol dosing is markedly variable and results in the potential of both cost gain and loss to a hospital. In consideration of estimated costs, there is the potential for $871.55 cost savings compared to a 2-day oral load and $3,803.10 compared to a 3-day oral load.

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