We adults sometimes puncture needles, and when blood vessels are hard to find, we will try to puncture needles many times. It hurts when we look at it, but it actually hurts.
Children are small and basically chubby. They are all meat, and they can't see blood vessels at all. Moreover, the blood vessels are very thin, and it is not easy for experienced nurses to find suitable blood vessels. If you make a mistake, you have to look again. If you prick the needle many times, the child will have to suffer more.
2, the child has no control, and puncturing the arm is easy to cause multiple injuries.
Children are young, ignorant, active, and have no sense of danger. Hands like to grab things and move around, while needles are hard and will not change with muscle contraction and bending. Moreover, the needle is sharp and sharp, which is easy to puncture blood vessels and cause danger. Needless to say, children are easily injured, and nurses have to prick them again, even many times, and it is the baby who is injured.
3, tying the head is conducive to infusion and baby activities, and the comfort will be much higher.
When the head moves, the whole head moves together. The place where the needle is inserted has the same trajectory and frequency as the head, so it is not easy to pull out the needle, which reduces the harm to the child.
When the needle is stuck in the head, it is not easy to backflow, and the infusion is smoother. The liquid is at room temperature, and the temperature of blood vessels in the head will be slightly lower than the stability of blood vessels in the wrist, so infusion is more comfortable.
However, simple infusion has been well studied. In the past, I had to get an injection after transfusion, and I had to re-tie it after transfusion. Some people stay in hospital for many days and need infusion every day. Pinholes are everywhere on the wrist. Where there are no needles on the wrist, we have to look for them on our feet, which makes people feel terrible.