Arteriolar vs. valvular thrombosis: Pick your evil!

Area of Science:

• Cardiology
• Nephrology
• Dermatology

Background:

• Anticoagulation for mechanical prosthetic valves is typically limited to vitamin K antagonists, unfractionated heparin, and low-molecular-weight heparin.
• Alternative anticoagulation options are often contraindicated or lack sufficient study, creating challenges when vitamin K antagonists are not feasible.
• This case highlights the complexities of anticoagulation management in patients with mechanical valves and end-stage renal disease.

Observation:

• A 72-year-old male with end-stage renal disease, atrial fibrillation, and mechanical mitral and aortic valves presented with progressing skin lesions.
• Lesions evolved into necrotic ulcers despite antibiotic treatment, with biopsy confirming calciphylaxis, a condition linked to renal disease.
• The patient was on warfarin for mechanical valve anticoagulation and atrial fibrillation prophylaxis.

Findings:

• Warfarin therapy was identified as a contributing factor to the development of calciphylaxis.
• Exchanging warfarin was necessary to prevent ulcer progression, with subcutaneous unfractionated heparin being the only alternative considered.
• Despite interventions, the patient experienced further calciphylaxis complications and ultimately expired.

Implications:

• Calciphylaxis is a severe disorder characterized by skin necrosis, predominantly affecting end-stage renal disease patients.
• The precise pathogenesis and effective treatments for calciphylaxis are not well understood, leading to a poor prognosis.
• Determining optimal anticoagulation in patients with both warfarin-induced calciphylaxis and mechanical valves requires further investigation and the development of new therapeutic regimens.