I had open heart surgery four years ago for mitral valve. recently my hands and feet turn very red. and now i cannot keep my right hand warm it.

A Fib?: You need to have the pulses checked and segmental BP study of your right upper extremity done as well as repeat tee or echo to try to rule out clot burden in left atrium, asap. If you lost your palpable pulses on your right upper extremity, imaging studies with the appropiate intervention is advised. Go see your cardiologist.

See cardiology: Valve repair or replacement can have late complications. You may need an echo test if atrial fibrillation is part of the situation, peripheral embolism is also another concern regarding the hand symptoms. The color changes may be separate .? Raynaud's see your md.