The situation bearing three related questions says "Your younger sister cuts her finger with a knife." This situation is a very common one in the households with younger siblings in the family.
1. Can situations similar to this be prevented? How? answer is absolutely yes. The question "how" bears so much suggestions in preventing it to happen. First, when little ones are able to grab sharp objects, that means the elders in the family did not secure the location of such objects. Next, if the situation happens when the younger ones use the said objects have the knowledge of the older people around, then perhaps the young ones were not guided along the way or were not properly taught how to use the said objects.
2. If these things happen, everyone in the family should know how to treat first aid cases, including the victims themselves, they must be taught how to treat themselves in case such events accidentally happen.
3. It is important that we treat first aid cases to avoid such turning into complicated health situations such as hemorrhage, etc.
The immediate action that should be done is to take some cloth to cover up the wound while the other person gets a pack of ice to put it on the wounded finger.
A cut finger would result in blood loss given that there are many blood vessels in the area near the fingers. The first step, therefore, when someone has her or his finger cut is to prevent further blood loss by:
1. taking the knife out - we do not want additional accidents.
2. applying a tourniquet above the wound.
In applying a tourniquet, you are able to restrict blood flow to the affected area. Make sure, however, that the area is NOT totally cutoff from blood supply, otherwise, this would result in gangrene.
After a tourniquet has been applied, wash the fingers with running water. Apply some sort of antiseptic, but not alcohol as the cut might be deep. Betadine would do. This is to prevent bacteria from entering the wound.
If the finger was cut, keep it in an ice box so that the doctors could attempt to re-attach them.
Of course, after first aid, bring the patient to the nearest hospital for proper medical treatment.
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