Rapidly Progressive and Catastrophic Calciphylaxis After Mechanical Valve Replacement: An Anticoagulation Dilemma.

Warfarin is the only approved anticoagulant after mechanical valve replacement, but it is a well described risk factor for calciphylaxis among patients with end-stage kidney disease. Our patient with end-stage kidney disease rapidly developed calciphylaxis after dual mechanical valve replacement in association with warfarin initiation, posing significant challenges in clinical management and a fatal outcome. (Level of Difficulty: Intermediate.).