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Very small case series of patients with apolipoprotein A1 (ApoA1) amyloidosis are available. We described the clinical and echocardiographic characteristics of individuals with the pathogenic  APOA1  variant Leu75Pro (p. Leu99Pro), referred for cardiac screening. We enrolled 189 subjects, 54% men, median age 55 years (interquartile range 42–67), 39% with concomitant renal disease and 31% with liver disease. Median left ventricular ejection fraction was 60% (55–66). Overall, these subjects did not show overt diastolic dysfunction nor left ventricular (LV) hypertrophy. Age correlated with interventricular septal (IVS) thickness ( r  = 0.484), LV mass index ( r  = 0.459), E/e’ ( r  = 0.501), and right ventricular free wall thickness ( r  = 0.594) (all  p  &lt; 0.001). Some individuals displayed red flags for cardiac amyloidosis (CA), and 14% met non-invasive criteria for CA. Twenty-nine subjects died over 5.8 years (4.1–8.0), with 10 deaths for cardiovascular causes. Individuals meeting echocardiographic criteria for CA had a much higher risk of all-cause death ( p  = 0.009), cardiovascular death ( p  = 0.001), cardiovascular death or heart failure (HF) hospitalisation ( p  &lt; 0.001). Subjects with both renal and liver involvement had a more prominent cardiac involvement, and shortest survival. Subjects with the  APOA1  Leu75Pro variant displayed minor echocardiographic signs of cardiac involvement, but 14% met echocardiographic criteria for CA. Subjects with suspected CA had a worse outcome.

Echocardiographic findings in subjects with an amyloidogenic apolipoprotein A1 pathogenic variant