Xinhua News Agency, Beijing, March 17 (Reporter Tian Xiaohang) Many people have had this experience: after blood was drawn, there was a bruise around the puncture point, which would not go away for several days. Why is this? Experts said that if the needle is not pressed in time and effectively, it often causes venous blood to bleed under the skin, resulting in skin bruising. To avoid bruising, the correct compression technique is as important as the excellent blood collection technique.
What are some common wrong compressions that can cause bruising? Zuo Qingna, a nurse in charge of the Health and Medical Department of Peking Union Medical College Hospital, said that, for example, after pressing for a few seconds, if there is no bleeding on the surface, then stop pressing. In fact, the eye of the needle in the subcutaneous blood vessel is still bleeding. Another example is that the compression position is inappropriate or the area is too small. Only compressing the skin puncture point and ignoring the compression of the main bleeding point, the blood vessel wall puncture point, will cause the blood vessel wall puncture point to bleed in the subcutaneous tissue, causing subcutaneous congestion.
In addition, pressing too lightly will lead to incomplete compression of the puncture point, which cannot effectively stop bleeding; pressing too hard will cause local capillaries to rupture and cause blood stasis. When hemostatic items are used, they may bleed again due to the impact of the instantaneous large blood flow. It is also a wrong practice to press while rubbing, which is not conducive to hemostasis at the puncture point, and the blood vessels and subcutaneous capillaries after the puncture are very fragile. It can also cause local congestion.
How to press properly? Zuo Qingna suggested that the pressing area should be sufficient to ensure that the skin puncture point and the blood vessel wall puncture point can be pressed at the same time. Compress for at least 5 minutes, with even and moderate pressure. Patients with coagulation insufficiency or oral aspirin should extend the compression time appropriately; the elbow should be straight during compression, because flexing the elbow will add extra pressure and cause the compression point to move with the skin away from the puncture Therefore, the puncture point of the blood vessel wall causes subcutaneous congestion due to the failure of effective compression.
What should I do if I have bruises? Zuo Qingna said that cold compresses with cold towels or ice packs can be used within 24 hours to constrict blood vessels, speed up hemostasis, and avoid lifting heavy objects with the limb; 24 hours after the bruises appear, apply hot towels again to promote blood circulation , to speed up the speed of silting. (End)