Hemolysis after percutaneous paravalvular leak repair

Area of Science:

• Cardiovascular Surgery
• Interventional Cardiology
• Nephrology

Background:

• Paravalvular leak (PVL) is a frequent complication following surgical mitral valve replacement, affecting approximately 17% of patients.
• Surgical closure is the standard treatment for PVL, but percutaneous closure offers an alternative for high-risk individuals.
• PVL can lead to serious adverse events, necessitating effective management strategies.

Purpose of the Study:

• To report a case of severe haemolytic anaemia and secondary renal failure after percutaneous closure of a prosthetic mitral valve paravalvular leak.
• To explore the potential mechanisms linking percutaneous PVL closure to haemolysis and renal dysfunction.

Main Methods:

• Case report presentation.
• Review of patient's clinical course, laboratory findings, and imaging studies.
• Discussion of the pathophysiology of haemolysis in the context of prosthetic valves and percutaneous devices.

Main Results:

• A patient developed severe haemolytic anaemia and acute kidney injury post-percutaneous mitral PVL closure.
• The clinical presentation suggests a causal link between the prosthetic valve, the closure device, and red blood cell damage.
• High shear stress at the site of the metallic foreign body is hypothesized to be the primary cause of haemolysis.

Conclusions:

• Percutaneous closure of paravalvular leaks, while beneficial for select patients, carries risks of complications such as haemolytic anaemia.
• The interaction between the prosthetic valve material, closure device, and hemodynamic forces can lead to significant red blood cell destruction.
• Careful patient selection and monitoring are crucial for managing potential complications after percutaneous paravalvular leak closure.