Cost-Utility Analysis of Sacubitril-Valsartan Compared with Enalapril Treatment in Patients with Acute Decompensated Heart Failure in Thailand

Abstract

Background: Sacubitril-valsartan is effective in reducing the N-terminal pro-B-type natriuretic peptide level of hospitalized patients with acute decompensated heart failure, with a high acquisition cost compared with enalapril treatment. Objective: This study aimed to determine the cost utility of sacubitril-valsartan compared with enalapril for acute decompensated heart failure treatment. Methods: A Markov model was constructed to project the total costs, life-years, quality-adjusted life-years (QALYs) of early initiation, and a 2-month delay of sacubitril-valsartan treatment and enalapril treatment in hospitalized patients with acute decompensated heart failure over a lifetime horizon from a Thai healthcare system perspective. Clinical inputs were mainly derived from the PIONEER-HF and PARADIGM-HF trials, together with Thai epidemiological data. Cost data were based on the Thai population. All costs and outcomes were discounted at 3% annually. A series of sensitivity analyses were performed. Results: Compared with enalapril, sacubitril-valsartan incurred a higher total cost per year (THB 42,994 [US$1367.48] vs THB 19,787 [US$629.37]), and it gained more QALYs (4.969 vs 4.755). The incremental cost-effectiveness ratio was THB 108,508/QALY (US$3451.26/QALY). Early initiation of sacubitril-valsartan treatment was more cost effective than delayed treatment. Sensitivity analyses revealed that at a level of willingness to pay of THB 160,000/QALY (US$5089/QALY), sacubitril-valsartan was a cost-effective strategy of about 60%. Conclusions: Sacubitril-valsartan is cost effective in patients with acute decompensated heart failure. However, the results are highly dependent on the long-term cardiovascular mortality, and they are applicable only to Thailand or countries with a similarly structured healthcare system. Long-term registries should be pursued to decrease the uncertainty around long-term mortality.