尿S100B蛋白和乳酸/肌酐在新生儿缺氧缺血性脑病早期诊断中的应用价值

目的探讨尿S100B蛋白、尿乳酸／肌酐比值对新生儿缺氧缺血性脑病（HIE）早期诊断的应用价值。方法检测58例足月HIE患儿在生后第1天、第2天、第3天,尿S100B蛋白、尿乳酸／肌酐比值水平．并在生后7天内进行HIE临床分度,以同期25例足月正常新生儿对照组。结果HIE组出生后3天内尿S100B蛋白含量和出生后1天内尿乳酸／肌酐比值明显高于对照组（P〈0．001）;3天内尿S100B蛋白和1天内尿乳酸／肌酐比值之间及与HIE的临床分度呈正相关（P〈0．001）;当尿S100B蛋白水平在0．47μg／L,尿乳酸／肌酐比值在0．55时,单独检测第3天尿S100B蛋白敏感度、特异度分别为90．4％、91．9％;尿乳酸／肌酐比值预测HIE的敏感度和特异度以出生后第1天最高,分别为91．5％和90．3％;如检测第3天尿S100B蛋白的同时监测生后1天内尿乳酸／肌酐比值可显著提高HIE诊断的准确性,联合应用两项指标进行检测,诊断的敏感度和特异度分别为98.8％、97．4％,较两种方法单独应用敏感度和特异度均提高。结论对窒息患儿以临床表现为基础,同时监测出生后3天内尿S100B蛋白和尿乳酸／肌酐比值,对提高HIE的早期诊断和临床分度具有一定的应用价值。

Urinary S100B protein and lactate/creatinine ratio measurements: a tool for the early identification of neonatal hypoxic-ischemic encephalopathy

OBJECTIVE: To investigate the value of urinary S100B protein and lactate/creatinine ratio determination in early identification of neonatal hypoxic-ischemic encephalopathy (HIE). METHODS: The levels of urinary S100B protein and urinary lactate/creatinine ratio were detected in 58 full-term newborn infants with HIE on the first, second and third day after birth. The severity of clinical manifestations, including the degree of encephalopathy, was assessed within 7 days after birth. Twenty five normal neonates were enrolled into the control groups. RESULTS: (1) The urinary S100B level of HIE neonates was significantly higher in samples collected throughout the monitoring period than those of the normal control groups (all P < 0.001). The urinary lactate/creatinine ratio of the HIE neonates was also significantly higher than that of normal control groups within the first day (P < 0.001). (2) A significantly positive correlation was found between the level of urinary S100B protein within three days and the urinary lactate/creatinine ratio within the first day and between the level of urinary S100B protein within three days and clinical degree (P < 0.05). (3) When S100B concentration was 0.47 microg/L and urinary lactate/creatinine ratio was 0.55, the sensitivity and specificity of detecting the third day urinary S100B alone, were respectively 90.4%, 91.9%. Detecting it associated with the first day urinary lactate/creatinine ratio could increase the sensitivity and specificity (respectively 98.8% and 97.4%) for predicting development of HIE. CONCLUSION: On the basis of clinical manifestations of asphyxic neonatals, detecting the level of urinary S100B within three days and the first day urinary lactate/creatinine ratio may be of important value in early diagnosis and grading of HIE.