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Thebesian veins, arteriosinusoidal and arterioluminal vessels drain blood from heart muscle into the chambers. Thebesian veins are reported common in atria and right ventricle, but scarce in the left ventricle. Since the left ventricle may be less prone to edema due to its intermittent cycle of perfusion, it is here proposed that Thebesian veins prevent myocardial edema. This is in concordance with...