Late clinical problems with Beall model 103 and 104 mitral valve prostheses: hemolysis and valve wear

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Hematology

Background:

• Mechanical heart valves are crucial for treating valvular heart disease.
• Hemolysis, the rupture of red blood cells, is a potential complication of prosthetic heart valves.
• The Beall mitral valve prosthesis has specific design features, including struts, that may influence blood-cell interactions.

Purpose of the Study:

• To investigate how the spatial orientation of Beall mitral valve prosthesis struts (Models 103 and 104) affects hemolysis.
• To compare hemolysis rates between prostheses with struts oriented parallel versus perpendicular to the left ventricular outflow tract axis.

Main Methods:

• A matched-pair study design was employed, selecting thirteen pairs of patients.
• Patients were grouped based on the orientation of their Beall mitral valve prosthesis struts: parallel or perpendicular to the left ventricular outflow tract axis.
• Complete blood counts and relative serum chemistry values were analyzed to assess hemolysis.

Main Results:

• Data on hemolysis rates based on strut orientation were collected and analyzed.
• Statistical comparison between the parallel and perpendicular orientation groups was performed.

Conclusions:

• The spatial orientation of Beall mitral valve prosthesis struts significantly influences hemolysis.
• Understanding this relationship can guide the design and implantation of prosthetic valves to minimize red blood cell damage.