维生素K_3是肝脏合成凝血酶元的必需物质。近年来各地报道具有解除平滑肌痉挛的作用,我们试用于“慢性喘息性支气管炎”计40例,该药对消除哮喘获得较好的疗效。本组40例中,男性12例,女性28例。均经住院确诊为慢性喘息性支气管炎。在哮喘发作时,立即用维生素K_3 4—8毫克肌注。30—45分钟后观察,哮喘完全缓解19例,占47.5%; Vitamin K_3 is essential for the synthesis of thrombin in the liver. In recent years reported around the lifting of the role of smooth muscle spasm, we try to “chronic asthmatic bronchitis” in 40 cases, the drug to eliminate asthma to obtain a better effect. In this group of 40 cases, 12 males and 28 females. Have been diagnosed as chronic asthmatic bronchitis hospitalized. In asthma attack, immediately with vitamin K_3 4-8 mg intramuscular injection. After 30-45 minutes, 19 cases were completely relieved of asthma, accounting for 47.5%.