Echocardiographic effects of sodium-glucose cotransporter 2 inhibitors in single ventricle circulatory failure.

Background: Single ventricle patients are at high risk of developing circulatory failure. There is limited evidence for pharmacological treatment. This study assessed the echocardiographic changes in ventricular function during sodium-glucose cotransporter 2 inhibitor (SGLT2i) therapy in patients with single ventricle failure (SVF). Methods: SVF patients with a baseline transthoracic echocardiogram within six months before starting SGLT2i and at least one echocardiographic examination within twelve months follow-up were included from a real-world international registry of adult congenital heart disease patients on SGLT2i. Mixed models were used to evaluate longitudinal changes in ventricular function and differences between patients with SVF with ≥ moderately reduced systolic function (SVFrEF) and with ≤ mildly reduced function (SVFpEF). Results: Thirteen patients were included. The median age was 21 [20-42] years, 8 (61.5 %) were female, 10 (76.9 %) had a Fontan circulation, 8 (61.5 %) had SVFrEF, and 5 (38.5 %) SVFpEF at the start of SGLT2i. The mean follow-up was 7.6 ± 3.3 months. End-systolic area decreased significantly in all patients (-1.6 cm Conclusions: Echocardiographic signals of improved ventricular function were observed in the first year of SGLT2i therapy in patients with SVF.