APOA1 and Tricuspid regurgitation: All individuals undergoing EMB are susceptible to complications, including tricuspid valve injury resulting in severe tricuspid valve regurgitation.<h4>Case summary</h4>Our patient is a 70-year-old white man presented with symptoms of dyspnoea on exertion and decreased functional capacity, diagnosed previously with apolipoprotein A-I cardiac amyloidosis, confirmed by EMB.