危重症患儿的原发疾病虽各不相同 ,以感染性疾病为常见。由于危重感染患儿多难于快速准确地检查致病菌而作出早期诊断 ,部分患儿有不同的免疫功能下降或累及多脏器使其功能损害 ;加之重症监护病房中侵入性检查的应用、广谱抗菌药物的应用 ,导致院内感染、双重感染、细菌耐药率 Although the primary diseases of critically ill children vary, infectious diseases are common. As critically ill children more difficult to quickly and accurately check the pathogens to make early diagnosis, some children have different immune function decreased or involving multiple organ dysfunction; combined with intensive care ward in the application of invasive examination, wide Spectrum antibacterial drugs, resulting in nosocomial infections, double infections, bacterial resistance rates