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Congestive cardiomyopathy in uraemic patients on long term haemodialysis
Insights
Uraemic patients undergoing haemodialysis can develop congestive cardiomyopathy. This study suggests primary heart muscle rigidity changes may precede reduced contractility in these patients.
Area of Science:
- Nephrology
- Cardiology
- Pathophysiology
Background:
- Progressive cardiac failure and congestive cardiomyopathy can occur in patients with uraemia undergoing haemodialysis.
- The exact cause of cardiomyopathy in uraemic patients is often unclear.
Observation:
- Five uraemic patients with progressive cardiac failure and congestive cardiomyopathy were studied.
- Angiocardiographic and haemodynamic studies confirmed cardiomyopathy.
- Patients showed increased left ventricular end-diastolic volume compared to non-uraemic controls.
Findings:
- Mean velocity of myocardial fibre shortening was significantly decreased.
- Index of normalised rigidity was significantly decreased.
- Two patients had ventricular dilatation and decreased rigidity but preserved ejection fraction, suggesting early changes.
Implications:
- The findings suggest that primary alterations in heart muscle rigidity may be an early event in uraemic congestive cardiomyopathy.
- This could lead to secondary changes in myocardial contractility.
- Understanding these mechanisms may inform therapeutic strategies for cardiac complications in uraemia.
Abstract:
Five uraemic patients who developed progressive cardiac failure with clinical evidence of congestive cardiomyopathy at the start or during haemodialysis treatment were studied. The diagnosis of cardiomyopathy, for which there was no apparent cause, was confirmed by angiocardiographic and haemodynamic studies. These showed a significant increase in left ventricular end-diastolic volume over normal values obtained in 12 patients without uraemia. The mean velocity of myocardial fibre shortening was significantly decreased, as was the index of normalised rigidity. Three of the five patients presented the complete picture of the disease. The other two also had considerable ventricular dilatation and a decreased index of normalised rigidity but normal ejection fraction and only moderately decreased myocardial contractility indices. This suggests that there may be primary involvement of normalised heart muscle rigidity followed by secondary changes in myocardial contractility in uraemic patients with congestive cardiomyopathy.