Related Experiment Videos
Patients with coronary collaterals and normal left ventricular systolic function: clinical, hemodynamic, and
Insights
Coronary collaterals, which supply blood to the heart, help maintain normal heart function in patients with coronary artery disease. These vital blood vessels may prevent systolic dysfunction even when arteries are blocked.
Area of Science:
- Cardiology
- Vascular Biology
- Heart Disease Research
Background:
- Coronary artery disease (CAD) affects millions globally, often leading to impaired heart function.
- Coronary collaterals are natural bypasses that can supply blood to areas of the heart with blocked arteries.
- The role of collaterals in preserving left ventricular function in CAD patients requires further elucidation.
Purpose of the Study:
- To investigate the impact of coronary collaterals on left ventricular systolic and diastolic function in patients with significant CAD.
- To compare the extent of coronary artery disease and collateralization between patients with and without collaterals.
Main Methods:
- A comparative study involving 120 patients with significant CAD and coronary collaterals versus 111 patients with significant CAD but no collaterals.
- Patients in both groups had normal left ventricular systolic function at baseline.
- Data collected included patient demographics, risk factors (hypertension, diabetes, smoking), number of diseased vessels, and collateral supply to specific coronary arteries.
Main Results:
- No significant differences in hypertension, diabetes, or smoking between groups.
- Patients with collaterals had significantly more diseased vessels (2.1 vs. 1.7, p<0.001) and more totally occluded vessels (101 vs. 2).
- Collateral supply varied by artery: richest to the right coronary artery, poorest to the left circumflex.
- Normal systolic function was preserved at rest even in cases of totally occluded vessels without visible collaterals.
Conclusions:
- Coronary collaterals play a crucial role in preserving left ventricular systolic and diastolic performance, at least at rest, in patients with significant CAD.
- The presence of collaterals may prevent the development of systolic dysfunction despite extensive coronary artery disease and vessel occlusion.
- Further research into "not readily visible" collaterals could offer new insights into preventing heart dysfunction.
Abstract:
One hundred and twenty consecutive patients with significant coronary artery disease, normal left ventricular systolic function, and coronary collaterals were compared with 111 patients with the same characteristics but with no collaterals. No significant differences were found between the two groups in hypertension, diabetes mellitus, and smoking. The left ventricular end diastolic pressure was 16.4+/-7 in the study group and 16.9+/-6.9 in the controls (NS). Significantly more diseased vessels were observed in the study group than in the control group (2.1+/-0.6 versus 1.7+/-0.6, p=<0.001). One hundred and one totally occluded vessels were found in the study group but only two in the control group. The richest collateral supply was to the right coronary artery: 94 sources to 85 diseased vessels (111%) including 66 sources to 52 totally occluded arteries (127%); to the left anterior descending: 59 sources to 89 diseased vessels (66%) including 37 sources to 33 totally occluded arteries (112%). The poorest supply was to the left circumflex: 17 sources to 69 diseased vessels (25%), including nine sources to 16 totally occluded arteries (56%). No collaterals were observed in 14 totally occluded vessels in the study group and in two of the controls, while the systolic function at rest was still normal. It is suggested that coronary collaterals are important in preserving left ventricular systolic and diastolic performance at least at rest. Not readily visible collaterals may also prevent systolic dysfunction.