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The relationship between prolapsing mitral leaflet syndrome and angina and normal coronary arteriograms
Insights
Patients with prolapsing mitral leaflet often experience chest pain, similar to those with angina and normal coronary arteriograms. This suggests two potential causes: primary mitral valve issues or secondary mitral prolapse due to myocardial disease.
Area of Science:
- Cardiology
- Pathophysiology
Background:
- Patients with prolapsing mitral leaflet (PML) often present with chest pain and normal coronary arteriograms.
- This clinical presentation mirrors that of patients experiencing angina with normal coronary arteriograms.
Purpose of the Study:
- To compare clinical, electrocardiographic, hemodynamic, angiographic, and metabolic findings between patients with PML and those with angina and normal coronary arteriograms.
- To investigate the underlying mechanisms contributing to chest pain in patients with PML.
Main Methods:
- Comparative study involving 20 patients with PML and 16 patients with angina and normal coronary arteriograms.
- Assessment included clinical evaluation, electrocardiography, cardiac hemodynamics, angiography, and metabolic studies.
Main Results:
- Clinical and hemodynamic findings were similar between the two groups, with the exception of mitral leaflet prolapse and systolic clicks in the PML group.
- The study identified two potential pathophysiological mechanisms for PML.
Conclusions:
- Prolapsing mitral leaflet may stem from primary mitral valve pathology (e.g., myxomatous degeneration) or secondary prolapse due to primary myocardial abnormalities.
- The latter mechanism may share pathophysiological similarities with angina in patients with normal coronary arteriograms.
Abstract:
Patients with a prolapsing mitral leaflet frequently have chest pain while their coronary arteriograms are normal. In this regard, these patients are similar to the group of patients with angina and normal coronary arteriograms. In the present study, clinical, electrocardiographic, cardiac hemodynamic, angiographic, and metabolic findings in 20 patients with a prolapsing mitral leaflet were compared to those of 16 patients with angina and normal coronary arteriograms. Except for the presence of mitral leaflet prolapse and systolic clicks, the findings were similar in both groups. We postulate that prolapsing mitral leaflet is probably related to two different mechanisms. In one the primary pathologic change is in the mitral valve (mainly myxomatous transformation), and the abnormalities of ventricular contraction are secondary to unloading of the heart because of a volume shift into the distended and enlarged mitral leaflets. In the other group, the primary pathologic change is in the myocardium, with secondary prolapse of the mitral valve. The myocardial abnormality itself is probably related to primary underlying myocardial disease or to arteriolar pathologic changes. The latter group has probably the same pathophysiologic abnormality as patients with angina and normal coronary arteriograms.