The dangers of an injury: bleeding - First Aid


First aid

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Superficial wounds and grazes Burns Sunburn
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The dangers of an injury: bleeding

The damage caused by a superficial injury is limited and generally excludes life-threatening conditions; however some considerations are useful to understand the appropriate treatments and to avoid trivial but annoying complications. As a first element to consider there are the dangers related to hemorrhage, that is, the leakage of blood due to lesion of the vessels located in the wound site.

As is known, the blood vessels are divided into arterial (bring oxygenated blood from the heart to the peripheral tissues) and venous (responsible for the return to the heart of the blood that has transferred oxygen to the peripheral tissues). The lesion of an arterial vessel is recognized because it causes the escape of bright red blood, pulsating and with a certain force, proportional to the caliber of the vessel; the lesion of a vein instead leads to the loss of blood of a darker color and with a lower flow of energy. Venous bleeding from a small diameter blood vessel usually subsides in a few minutes, both due to the modest flow rate and the immediate activation by the body of the coagulation processes which form a sort of physiological buffer . A bleeding from an arterial vessel, on the other hand, has a longer duration due to the more lively flow, which slows down or hinders the normal tamponade implemented by the body at the site of the bleeding (formation of a thrombus).

In more superficial wounds, bleeding is usually modest, although sometimes areas of the skin that are very rich in blood vessels may be affected: we have all had the opportunity, for example, to find that even a small wound on the head or a lip usually bleeds in copious and prolonged.

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