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Dissecting cuspal hematomas. A rare form of porcine bioprosthetic valve dysfunction
Insights
Dissecting cuspal hematomas (DCHs) are an uncommon cause of porcine bioprosthesis (PB) failure. These hematomas can lead to valve dysfunction in both mitral and aortic positions and may be linked to anticoagulation therapy.
Area of Science:
- Cardiovascular Surgery
- Biomaterials Science
- Pathology
Background:
- Porcine bioprostheses (PBs) are widely used in cardiac valve replacement.
- Valve failure can occur due to various complications, necessitating explantation and analysis.
- Dissecting cuspal hematomas (DCHs) are a recognized, though infrequent, complication.
Purpose of the Study:
- To investigate the occurrence and impact of DCHs in explanted porcine bioprostheses.
- To determine the role of DCHs in valve dysfunction and failure.
- To explore potential associations between DCHs and patient factors like anticoagulation.
Main Methods:
- Analysis of 193 explanted porcine bioprostheses from patients undergoing reoperation.
- Histopathological examination to identify and characterize DCHs.
- Correlation of DCH presence with valve position (mitral/aortic) and observed valve dysfunction.
Main Results:
- Large DCHs were identified in 6% (6 of 193) of explanted PBs.
- DCHs contributed to valve dysfunction in 4 mitral and 1 aortic PB.
- In one aortic PB, DCH was the sole cause of failure, leading to stenosis.
- DCHs were also observed with commissural tears causing incompetence in mitral PBs.
- DCHs may be a complication associated with anticoagulation therapy.
Conclusions:
- DCHs are an infrequent but significant cause of porcine bioprosthesis failure.
- DCHs can affect PBs in both mitral and aortic positions, causing stenosis or incompetence.
- Anticoagulation therapy may be a contributing factor to the development of DCHs.
Abstract:
Large dissecting cuspal hematomas (DCHs) were present in six (3%) of 193 porcine bioprostheses (PBs) explanted at reoperation. In four mitral PBs, the DCHs contributed to valve dysfunction; in one aortic PB, DCH was the only determinant of failure, causing stenosis by cusp thickening and rigidity. In another mitral PB, DCHs were occasionally found in the setting of valve incompetence due to commissural tears. While confirming that DCHs are a potential but infrequent cause of PB failure, these observations demonstrate that they may involve PBs implanted both in mitral and aortic position and might be a complication of anticoagulation.