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“Your heart can actually form its own bypass from exercising, so you can develop that collateral circulation,” she said.

“If you have coronary heart disease, even a little bit, which we all get as part of the aging process, if you are regularly exercising, your body will develop all of these blood vessels - that’s collateral circulation. That can actually help sustain life and prevent you from having a heart attack.”

They all had a proximal vessel occlusion, a small infarct core, and moderate-to-good collateral circulation.

When the collateral circulation is insufficient to remove the blood from a region whose efferent venous trunk is completely filled with a thrombus, the phenomena of stagnation are produced.

Cohnheim states that after a sudden venous obstruction, in case an efficient collateral circulation does not interfere, the capillaries and small veins become distended with stagnant blood and appear as masses of red blood-corpuscles.