The reason of low molecular weight heparin injection site bruising and to investigate the injection method

Objective To analyze the reason of low molecular weight heparin injection site bruising and to investigate the injection method. Methods A total of 120 cases treated by subcutaneous injection of low molecular weight heparin calcium were received two kinds of injection technique: injection technique A was the new improved injection method ( Detaining air bubble skill combined with translation abdomen fold method used 30 s injection duration) and injection technique B was the routine method. The injected sites of method A was the left side of abdomen, the injection duration was 30 s, and 618 injections were executed; while the injection sites of method B was the right side of the abdomen, the injection duration was 10 s, and 617 injections were executed. Self comparison was done to analyze the local reactivity condition and pain degree of the two injection methods. Results There were significant differences in injection site bruising incidence rate (73.9% vs 37.2% ), hemorrhagic petechia average diameter (P＜0.01) and the degree of pain ( P ＜ 0. 05 ) between method A and method B. Conclusions Injection technique A could obviously reduce the rate of injection site hemorrhage and pain in low molecular weight heparin calcium injection. Key words: Low molecular weight heparin;  Hemorrhage;  Injection technique