Key result
Canine mature coronary collateral arteries contracted to approximately half the force of normal arteries, but neointimal encroachment reduced the lumen to zero under constrictor stimuli.
Population
17 dogs with a casein occluder near the origin of the circumflex coronary artery, prepared at least 24 weeks…
Comparison
In vitro exposure of isolated epicardial… vs Normal left anterior descending coronary…
Design
Preclinical
Follow-up
At least 24 weeks
Authors
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May predispose mature collaterals to occlusion despite weaker contraction; leaves open relevance to human coronary vasospasm.
Mature canine coronary collateral arteries exhibit poor contractility but exaggerated luminal narrowing due to structural changes like neointimal thickening, suggesting they are compromised flow conduits that may contribute to vasospastic angina.
Angus et al. (1991) studied mature coronary collateral arteries (n=17). Constrictor and dilator agents vs. Normal left anterior descending coronary arteries was evaluated on Vascular reactivity (isometric force). Canine mature coronary collateral arteries contracted to approximately half the force of normal arteries, but neointimal encroachment reduced the lumen to zero under constrictor stimuli.
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