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Coronary artery size in mitral regurgitation and its regression after mitral valve surgery
G Vassalli1, O M Hess, O N Krogmann
1Department of Internal Medicine, Cardiology, BPol 11, University Hospital, Zurich.
Insights
In chronic mitral regurgitation, coronary artery size increases with left ventricular hypertrophy. Surgery partially reverses left coronary artery enlargement but normalizes right coronary artery size.
Area of Science:
- Cardiovascular Medicine
- Cardiac Surgery
- Interventional Cardiology
Background:
- Chronic mitral regurgitation leads to left ventricular hypertrophy and altered cardiac hemodynamics.
- Coronary artery adaptation in response to chronic volume overload is not fully understood.
- Understanding coronary artery size changes is crucial for managing patients with mitral valve disease.
Purpose of the Study:
- To investigate the relationship between coronary artery dimensions and left ventricular muscle mass in patients with chronic mitral regurgitation.
- To assess changes in coronary artery size before and after mitral valve surgery.
- To explore correlations between coronary artery size, left ventricular hypertrophy, and pulmonary artery pressure.
Main Methods:
- Quantitative coronary arteriography was used to measure left and right coronary artery size.
- Study included 10 control subjects and 10 patients with chronic mitral regurgitation.
- Measurements were taken preoperatively and 28 +/- 15 months post-mitral valve surgery.
Main Results:
- Preoperatively, both left and right coronary arteries were significantly enlarged in patients compared to controls.
- A strong linear correlation was observed between left ventricular muscle mass and both left (r=0.88) and right (r=0.84) coronary artery size.
- Post-surgery, left coronary artery size partially regressed, while right coronary artery size normalized.
Conclusions:
- Coronary artery enlargement in chronic mitral regurgitation is directly proportional to the degree of left ventricular hypertrophy.
- Right coronary artery dilation is likely a consequence of right ventricular pressure overload.
- Mitral valve surgery leads to partial regression of left coronary artery size and normalization of right coronary artery size.
Abstract:
The relationship between coronary artery size and left ventricular (LV) muscle mass was studied in 10 control subjects and in 10 patients with chronic mitral regurgitation before and 28 +/- 15 months after mitral valve surgery. Left and right coronary artery size was determined by quantitative coronary arteriography. Left coronary artery size was significantly increased before surgery (26 mm2) and decreased after operation (23 mm2), but was still larger than in control subjects (14 mm2). The right coronary artery was also enlarged preoperatively (13 mm2; controls = 9 mm2), but was normalized after surgery (11 mm2). A linear correlation was found between LV muscle mass and left (r = 0.88, p < 0.001) and right coronary artery size (r = 0.84, p < 0.001) as well as between right coronary artery size and mean pulmonary artery pressure (r = 0.56, p < 0.01). Thus in chronic mitral regurgitation the enlargement of the left and right coronary artery is proportional to the degree of LV hypertrophy. The increase in right coronary artery size is probably the result of right ventricular pressure overload. Postoperatively there is only partial regression of left coronary artery size but normalization of right coronary artery size.