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Echocardiographic findings in autosomal dominant polycystic kidney disease
K F Hossack1, C L Leddy, A M Johnson
1Department of Medicine, University of Colorado School of Medicine, Denver.
Insights
Patients with autosomal dominant polycystic kidney disease (ADPKD) show a significantly higher prevalence of cardiac abnormalities, including mitral valve prolapse and various forms of valve incompetence. These findings suggest ADPKD is a systemic disease affecting the heart due to extracellular matrix defects.
Area of Science:
- Cardiology
- Nephrology
- Genetics
Background:
- Autosomal dominant polycystic kidney disease (ADPKD) is a common genetic disorder.
- Cardiac involvement is increasingly recognized in systemic diseases.
- Understanding cardiac manifestations in ADPKD is crucial for comprehensive patient care.
Purpose of the Study:
- To determine the prevalence of cardiac abnormalities in patients with ADPKD.
- To compare cardiac findings in ADPKD patients with unaffected family members and healthy controls.
- To investigate the potential link between ADPKD and specific cardiac defects.
Main Methods:
- Echocardiography with Doppler analysis was employed.
- 163 patients with ADPKD were studied.
- Comparison groups included 130 unaffected family members and 100 healthy controls.
Main Results:
- Mitral valve prolapse was significantly more common in ADPKD patients (26%) compared to family members (14%) and controls (2%).
- Higher prevalences of mitral incompetence (31% vs 14% vs 9%), aortic incompetence (8% vs 3% vs 1%), tricuspid incompetence (15% vs 7% vs 4%), and tricuspid valve prolapse (6% vs 2% vs 0%) were observed in ADPKD patients.
- All observed differences were statistically significant (P < 0.05).
Conclusions:
- Cardiac abnormalities are prevalent in patients with autosomal dominant polycystic kidney disease.
- These findings support the systemic nature of ADPKD.
- The cardiac manifestations may stem from an underlying defect in the extracellular matrix, characteristic of ADPKD.
Abstract:
Echocardiography, including Doppler analysis, was performed to assess the prevalence of cardiac abnormalities in 163 patients with autosomal dominant polycystic kidney disease, 130 unaffected family members, and 100 control subjects. In these three groups, the prevalence of mitral-valve prolapse was 26, 14, and 2 percent, respectively (P less than 0.0005). A higher prevalence of mitral incompetence (31, 14, and 9 percent, respectively; P less than 0.005), aortic incompetence (8, 3, and 1 percent, respectively; P less than 0.05), tricuspid incompetence (15, 7, and 4 percent, respectively; P less than 0.02), and tricuspid-valve prolapse (6, 2, and 0 percent, respectively; P less than 0.02) was also found in the patients with polycystic kidney disease. These findings reflect the systemic nature of polycystic kidney disease and support the hypothesis that the disorder involves a defect in the extracellular matrix and the cardiac abnormalities are an expression of that defect.