AApoAI-CA was associated with right-sided involvement, with a thicker right ventricular free wall (8.6±1.9 versus 6.3±1.3 mm versus 7.7±1.2 mm, <i>P</i>=0.004), greater incidence of tricuspid stenosis (4 [31%] versus 0 [0%] versus 0 [0%], <i>P</i>=0.012) and tricuspid regurgitation (6 [46%] versus 1 [8%] versus 2 [15%], <i>P</i>=0.048) than AL-CA and transthyretin CA. The gene discussed is TTR; the disease is Tricuspid regurgitation.