Arterial blood collection pain is related to arterial innervation and arterial distribution.
1. Innervation: Compared with veins, arteries have more peripheral nerves, and the tip of the needle traverses and touches more nerves to collect blood, which feels painful.
Arteries of the same grade are thicker than veins and have more muscle cells. When the artery is stimulated by the needle tip, the nerves in the blood vessel receive the stimulus and cause vasospasm, resulting in pain.
2. Arterial distribution: the distribution of arteries tends to be deeper in the body, the radial artery and the groin area of the femoral artery is relatively superficial, often as the arterial blood collection site, and these two locations of the skin is thin and sensitive, the needle pain is very obvious.
After arterial blood collection, attention must be paid to the time and strength of the pressure, arterial blood pressure is high, the pressure is not in place to spill blood into the tissues will cause pain after blood collection.