Organ Transplant Reperfusion Injury

When a transplanted organ is finally reconnected to blood flow after a period of cold storage, the first minutes of reperfusion are not simply a return to normal — they trigger a burst of reactive oxygen species through the xanthine-oxidase pathway that can injure the very tissue the transplant was meant to save. This simulator renders a block of donor tissue as thousands of individually tracked cells: set the cold ischemia time to control how much ATP is depleted and how much hypoxanthine substrate accumulates in storage, then trigger reperfusion and watch the free-radical burst propagate through the tissue, shifting cell color from ischemic blue through oxidative-injury orange toward necrotic gray. Antioxidant defense capacity and a xanthine-oxidase inhibitor (modeling allopurinol) can be tuned before or during the burst to see how real preservation and pharmacologic strategies blunt reperfusion injury, while live readouts track mean ATP, ROS level, and overall cell viability.