Pathophysiologic findings of occlusive AMI
- Intestinal ischemia results from tissue hypoxia, which can be secondary to a decrease in blood volume, red blood cell mass, flow rate, or oxygen content.
- As the radius of an artery decreases, the resistance to flow increases by a power of 4.
- Autoregulation results in vasodilation to maintain flow up to a finite point, beyond which flow decreases. Examples of such instances are acute or chronic arterial thrombi, an embolus, or transient vasoconstriction.
