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Coronary artery luminal diameter in aortic stenosis
Insights
Patients with aortic stenosis (AS) show enlarged coronary arteries compared to controls. This coronary artery dilation weakly correlates with left ventricular (LV) hypertrophy, but doesn't explain angina symptoms in AS patients.
Area of Science:
- Cardiology
- Vascular Biology
- Cardiac Physiology
Background:
- Aortic stenosis (AS) is a significant cardiovascular condition.
- Left ventricular (LV) hypertrophy is a common consequence of AS.
- Coronary artery function in AS patients requires further investigation.
Purpose of the Study:
- To compare coronary artery luminal diameters in patients with AS versus control subjects.
- To investigate the correlation between coronary artery size and LV hypertrophy.
- To explore the relationship between coronary artery dimensions, LV pressures, and angina in AS.
Main Methods:
- Derived index used to measure coronary artery luminal diameters.
- Comparison of measurements between 32 AS patients and 24 control subjects.
- Analysis of correlations with LV wall thickness and mass, and LV pressures in subgroups.
Main Results:
- Patients with AS exhibited significantly larger coronary arteries than controls (p < 0.01).
- Coronary artery dilation showed weak correlations with LV wall thickness (r=0.32) and LV mass (r=0.34).
- AS patients with angina had higher peak LV pressures and systolic gradients than those without, but no difference in coronary artery diameter.
Conclusions:
- AS is associated with increased coronary artery luminal diameters.
- LV hypertrophy is only weakly related to this coronary dilation.
- Coronary artery size does not appear to be a primary driver of angina in AS patients with normal coronary angiograms.
Abstract:
The coronary artery luminal diameters in 32 patients with aortic stenosis (AS) were compared with those of 24 control subjects without left ventricular (LV) hypertrophy by means of a derived index. Patients with AS had significantly larger coronary arteries than the control subjects (p less than 0.01). The increase in coronary luminal diameter had a weak correlation to LV wall thickness (r = 0.32) and LV mass (r = 0.34). Among 21 patients with AS and normal coronary angiograms, those with angina had higher peak LV pressures (224 +/- 8 vs 196 +/- 7 mm Hg) and greater peak systolic gradients (103 +/- 9 vs 74 +/- 10 mm Hg) than those without angina (p less than 0.05). However, there was no significant difference in coronary artery diameters, peak LV stress or LV tension at rest between patients with and without angina.