重症监护病房的新生儿,尤其是早产儿,生后第1周患病和死亡率较高,因而早期诊断新生儿各种并发症是新生儿医务工作者面临的巨大挑战。近年来,脉搏血氧仪(简称脉氧仪)已成为新生儿重症监护病房(NICU)的重要监测仪器之一。据报道,通过脉氧仪信号得出的灌注指数(perfusion index,PI Neonates in intensive care units, especially premature babies, have a high prevalence and mortality in the first week of life, and early diagnosis of neonatal complications is a tremendous challenge for neonatal medical workers. In recent years, the pulse oximeter (referred to as pulse oximeter) has become one of the important monitoring instruments in neonatal intensive care unit (NICU). It has been reported that the perfusion index (PI