When explaining to a patient why he only had minimal muscle damage following 99% occlusion of the left anterior descending artery, the nurse will explain this is primarily due to

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Collateral circulation is a mechanism for the long-term regulation of local blood flow. Anastomotic channels exist between some of the smaller arteries. These channels permit perfusion of an area by more than one artery. When the artery becomes occluded, these anastomotic channels increase in size, allowing blood from a patent artery to perfuse the area supplied by the occluded vessel.

When Explaining to a Patient Why He Only Had Minimal