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Abstract   Aims  Sodium‐glucose cotransporter 2 inhibitors (SGLT2i) improve clinical outcomes in heart failure patients with reduced and preserved left ventricular ejection fraction (LVEF), but have not yet been investigated in transthyretin amyloid cardiomyopathy (ATTR‐CM). This study aimed to evaluate tolerability, clinical outcomes, and changes in NT‐proBNP levels and glomerular filtration rate (GFR) in ATTR‐CM patients treated with dapagliflozin.    Methods and results  Patients with stable, tafamidis‐treated ATTR‐CM were retrospectively evaluated at the initiation of dapagliflozin and 3 months thereafter. Tafamidis‐treated ATTR‐CM patients without SGLT2i served as a reference cohort. Overall, SLGT2i therapy was initiated in 34 patients. Seventeen patients with stable disease on tafamidis, who were subsequently started on dapagliflozin, were included in the analysis. Patients selected for SGLT2i presented with signs of advanced disease, evidenced by higher Gillmore disease stage (stage ≥2: 53% vs. 27.5%;  P  = 0.041), baseline median NT‐proBNP [median (IQR) 2668 pg/mL (1314–3451) vs. 1424 (810–2059);  P  = 0.038] and loop diuretic demand (76.5% vs. 45% of patients;  P  = 0.044), and lower LVEF (46.6 ± 12.9 vs. 53.7 ± 8.7%;  P  = 0.019) and GFR (51.8 ± 16.5 vs. 68.5 ± 18.6 mL/min; P = 0.037) compared with the reference cohort. At 3‐month follow‐up, a numerical decrease in NT‐proBNP levels was observed in 13/17 (76.5%) patients in the dapagliflozin (−190 pg/mL, IQR: −1,028–71,  P  = 0.557) and 27/40 (67.5%) of patients in the control cohort (−115 pg/mL, IQR: −357–105,  P  = 0.551). Other disease parameters remained stable and no adverse events occurred.    Conclusions  In tafamidis‐treated ATTR‐CM patients, initiation of dapagliflozin was well tolerated. The efficacy of SGLT2i therapy in patients with ATTR‐CM needs to be studied in randomized controlled trials.

SGLT2 inhibitor therapy for transthyretin amyloid cardiomyopathy: early tolerance and clinical response to dapagliflozin