Observing for half an hour is a common practice in the face of some uncertainties in surgery.
Especially the observation of blood supply, which involves the supply of oxygen and nutrients to organs and related tissues. It's not immediately obvious.
For example, the limbs are bitten by poisonous snakes or spiders. At this time, the correct way is to tie the wound near the heart to prevent the circulation of blood supply. The purpose is to prevent the venom from entering key parts such as the heart and nerve center along the blood circulation.
many people don't know
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