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Abnormalities in the mitral valve apparatus in patients undergoing long-term hemodialysis. Autopsy and
Insights
Long-term hemodialysis patients may develop overlooked mitral valve issues, including fibrosis and calcification. These cardiac abnormalities, detectable by echocardiography, can lead to functional impairment.
Area of Science:
- Cardiovascular Pathology
- Nephrology
- Medical Imaging
Background:
- Long-term hemodialysis is a critical treatment for end-stage renal disease.
- Cardiac complications are common in patients undergoing chronic hemodialysis.
- Mitral valve apparatus abnormalities are not well-characterized in this population.
Observation:
- Autopsy examination of six long-term hemodialysis patients revealed previously overlooked mitral valve changes.
- Two distinct abnormalities were noted: fibrosis/thickening of chordae tendineae and extensive mitral annular calcification.
Findings:
- Four patients exhibited fibrosis and thickening of the chordae tendineae, with one case showing severe mitral regurgitation.
- Two patients presented with extensive mitral annular calcification, extending to leaflet bases, papillary muscle, and chordae tendineae in one instance.
- The etiology of fibrosis is unclear, but secondary hyperparathyroidism is suspected for calcification.
Implications:
- These mitral valve abnormalities may be associated with significant functional impairment.
- M-mode and two-dimensional echocardiography successfully diagnosed these conditions pre-mortem in all six patients.
- Further research is needed to elucidate the pathogenesis and clinical significance of these hemodialysis-associated valvular changes.
Abstract:
Examination of the heart at autopsy in patients who received long-term hemodialysis revealed the following two changes in the mitral valve apparatus previously almost completely overlooked: (1) fibrosis and thickening affecting chordae tendineae in four cases: in one, severe mitral regurgitation was documented by hemodynamic studies; (2) extensive calcification in the mitral anulus region in two cases, with calcification in the base of the mitral leaflets in one and in the papillary muscle and chordae tendineae in the other. The causes of these abnormalities is unclear. Rheumatic and other known causes all seem unlikely origins of the extensive fibrosis. Secondary hyperparathyroidism is probably responsible for the calcification. In all six patients, these abnormalities in the mitral valve apparatus, which may be associated with functional impairment, were diagnosed during life by M-mode and two-dimensional echocardiography.