Abstract 4135480: Effect of Time Since Heart Failure Diagnosis or Hospitalization on the Cost-effectiveness of Dapagliflozin in Patients with Heart Failure with Mildly Reduced or Preserved Ejection Fraction

Background: Previous studies have shown dapagliflozin, a sodium-glucose co-transporter-2 inhibitor (SGLT2i), to be a cost-effective treatment option for patients with heart failure (HF) with preserved or mildly reduced ejection fraction (HFpEF/HFmrEF) in multiple European settings. Research question: Is the cost-effectiveness of dapagliflozin treatment in HFpEF/HFmrEF modified by either the time since HFpEF/HFmrEF diagnosis or the time since the last hospitalization for heart failure (HHF) event? Methods: A Markov cohort transition model was built for the UK setting, informed by patient-level data from the randomized, placebo-controlled DELIVER trial. The patient population was subset according to categories of time since last HHF event (including no prior HHF) and time since HF diagnosis (further subset to those with no prior HHF). For each subgroup, disease evolution was characterized by transitions among health states defined by quartiles of the Kansas City Cardiomyopathy Questionnaire Total Symptom Scale. The risk of fatal (cardiovascular and non-cardiovascular) and non-fatal events of worsening HF were modelled, adjusting for baseline characteristics and time-updating health state. Incremental costs and quality-adjusted life-years (QALYs) were calculated for each subgroup to yield incremental cost-effectiveness ratios (ICERs). Results: The lowest ICERs were observed for subgroups with the shortest time from HF diagnosis (with and without prior HHF) or last HHF event (Figure 1). Across all subgroups, the calculated ICERs were below the UK willingness-to-pay (WTP) threshold of £20,000/QALY gained. Conclusions: In patients with HFpEF/HFmrEF, the cost-effectiveness of dapagliflozin improved (via lower ICERs) in the subgroups corresponding to earliest disease (least time since an HHF event or HF diagnosis) compared with groups of later disease and potentially delayed treatment initiation. These findings suggest early optimization of HF therapy with implementation of guideline-directed medical therapy, including SGLT2is, may improve economic value.