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Relation between left coronary artery stenosis and regional left ventricular function
Insights
Diastolic dysfunction in the left ventricle is more sensitive to coronary artery stenosis than systolic dysfunction. Severe stenosis (>90%) significantly impacts diastolic wall thinning, even without infarction.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Ischemic heart disease can affect left ventricular wall dynamics.
- Assessing regional ventricular function is crucial for understanding disease impact.
Purpose of the Study:
- To investigate the effect of left main and proximal anterior descending coronary artery stenosis on anterior left ventricular wall dynamics.
- To determine if diastolic function is a more sensitive indicator of regional left ventricular dysfunction than systolic function.
Main Methods:
- Roentgen videometric analysis of left ventricular angiograms.
- Studied 70 patients with ischemic heart disease.
- Compared wall thickening and thinning rates between normal and stenotic coronary artery groups.
Main Results:
- Patients with ischemic heart disease showed significantly reduced peak systolic wall thickening and diastolic wall thinning.
- Severe stenosis (>90%) correlated with reduced diastolic wall thinning, but not systolic wall thickening.
- Diastolic dysfunction was detectable even in patients without infarction and was not identified by other global or regional function parameters.
Conclusions:
- Diastole is more sensitive to regional left ventricular dysfunction caused by coronary artery stenosis than systole.
- Diastolic wall thinning is a sensitive marker for significant coronary artery stenosis, particularly in the absence of infarction.
Abstract:
The effect of stenosis of the left main and proximal anterior descending coronary arteries on anterior left ventricular wall dynamics was investigated in 70 patients with ischemic heart disease by the use of roentgen videometric analysis of left ventricular angiograms. In all patients with ischemic heart disease, mean values for peak rate of systolic wall thickening and diastolic wall thinning were significantly smaller than normal (P less than 0.01). In patients without infarction, there was no correlation between peak rate of systolic anterior wall thickening and stenosis of the coronary artery supplying it, but there was a significant reduction in peak rate of diastolic wall thinning (P less than 0.01) in patients with stenosis greater than 90%; this difference was not apparent at any lower degree of stenosis. This population could not be recognized by any other parameter of global or regional ventricular function; thus, diastole is more sensitive to regional left ventricular dysfunction than systole.