Figure 19. Mechanical and biologic heart valves. Lateral radiograph of the chest shows a mechanical mitral valve (Carbomedics) (curved arrow), a mechanical aortic valve (Top-hat; Carbomedics) (arrowhead), and a biologic tricuspid valve (Hancock; Medtronic) (straight arrow). Note the sternotomy wires, epicardial pacing wire, and mediastinal clips.