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[Effect of valve type and valve function on chronic intravascular hemolysis after alloprosthetic mitral and aortic
Insights
Haptoglobin effectively detects intravascular hemolysis after alloprosthetic heart valve replacement. Hemolysis degree indicates prosthesis function, especially with valve dysfunction like leakage or thrombosis.
Area of Science:
- Cardiovascular Surgery
- Hematology
- Biomaterials Science
Context:
- Alloprosthetic heart valves are crucial for patients with valvular heart disease.
- Hemolysis, or red blood cell destruction, is a known complication following valve replacement.
- Monitoring hemolysis aids in assessing prosthetic valve performance and patient outcomes.
Purpose:
- To evaluate hemolysis parameters in patients with various alloprosthetic mitral and aortic valves.
- To identify sensitive biomarkers for detecting hemolysis and red cell damage.
- To correlate hemolysis levels with valve type, function, and presence of complications like leakage or thrombosis.
Summary:
- This study analyzed hemolysis in 1091 patients with Björk-Shiley, Lillehei-Kaster, Starr-Edwards, and St. Jude Medical valves.
- Haptoglobin proved most sensitive for mild intravascular hemolysis, present in two-thirds of patients.
- Elevated hemolysis, particularly with valve dysfunction (p < 0.0005), reliably indicates prosthesis integrity.
Impact:
- Identifies haptoglobin as a key biomarker for early detection of hemolysis post-valve replacement.
- Demonstrates that hemolysis degree is a reliable indicator of prosthetic valve functional integrity.
- Provides insights into differential hemolysis rates among various prosthetic valve types and identifies risk factors like valve dysfunction.
Abstract:
In 1091 patients with isolated Björk-Shiley, Lillehei-Kaster, Starr-Edwards, and St. Jude Medical mitral and aortic valve replacement, hemolysis parameters were determined (hemoglobin, LDH, haptoglobin, free plasma hemoglobin, reticulocyte count, serum bilirubin, transferrin, urine hemosiderin, schistocyte count). In 1006 of these patients no valve dysfunction was detected, while in 85 patients either paravalvular leakage or a thrombosis of the prosthetic valve was present. Haptoglobin was the most sensitive parameter for detecting even mild intravascular hemolysis, which was present in two-thirds of patients after alloprosthetic heart valve replacement. For quantifying red cell damage LDH was useful. Hemolysis was somewhat higher after Lillehei-Kaster and Starr-Edwards than after Björk-Shiley or St. Jude Medical implantation. The variance of LDH levels can be explained in a high percentage by correlating them with the hemodynamic findings at rest and exercise, which are indirect parameters of velocity profiles. Hemolysis is higher after aortic than after mitral valve replacement, with the exception of St. Jude valves. In patients with perivalvular leakage or valve thrombosis, red cell damage is more pronounced than in normally functioning prostheses (p less than 0.0005). When the hemolysis characteristics of the individual types of prosthesis are taken into account, the degree of hemolysis is a reliable indicator (p less than 0.05) of the functional integrity of the prosthesis. However, the degree of hemolysis does not correlate with the hemodynamic significance of perivalvular regurgitation.