Animals were given intramuscularly DDV,and when the mean blood pressure was to 40-45mmHg,the drugs were intramuscularly injected and the hemodynamic changes were observed?

• 但在救治失败的病人中，循环衰竭为主要死亡原因之一，目前对其研究较少，治疗方法少，值得进一步研究。