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Objective To find the pathogenesis of sudden infant death syndrome (SIDS) from changes of pulmonary surfactant. Methods By means of thin layer chromatography technique, surfactant in whole lung specimens of 10 infants with SIDS and 10 control infants without SIDS (dead of nonrespiratory diseases) were examined qualitatively and quantitatively. Results Eleven components in pulmonary surfactant were examined qualitatively, including lysophosphatidylcholine, sphingomyelin, phosphatidylcholine, phosphatidylserine, phosphatidylinositol, phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, phosphatidic acid, cholesterol and neutral lipids. Quantitative examination showed that the amount of surfactant of whole lung specimens in sudden death group [(8.9±1.0) mg/g wet lung weight] was significantly less than that in control group [(12.6±1.4) mg/g wet lung weight, P<0.01]. Qualitative variance showed that the percentages of phosphatidylcholine (49.4%±2.0%) and phosphatidylglycerol (2.6%±0.7%) decreased markedly in sudden death group compared with those in control group (61.5%±3.0% and 4.3%±1.5%, P<0.01). Conclusion Before death there is serious defect on metabolism of pulmonary surfactant in sudden death infants, with the amount decreasing and the ratio of its components being disturbed, which is one of the important pathogenies of SIDS.
Objective To find the pathogenesis of sudden infant death syndrome (SIDS) from changes of pulmonary surfactant. Methods By means of thin layer chromatography technique, surfactant in whole lung specimens of 10 infants with SIDS and 10 control infants without SIDS (dead of nonrespiratory diseases) Results Eleven components in pulmonary surfactant were examined qualitatively, including lysophosphatidylcholine, sphingomyelin, phosphatidylcholine, phosphatidylserine, phosphatidylinositol, phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, phosphatidic acid, cholesterol and neutral lipids. Quantitative examination showed that the amount of surfactant of Whole lung specimens in sudden death group [(8.9 ± 1.0) mg / g wet lung weight] were significantly less than that in control group [(12.6 ± 1.4) mg / g wet lung weight, P <0.01] the percentages of phosphatidylcholine (49.4% ± 2.0%) and phospha Conclusion The death of is significantly deficient on metabolism of pulmonary surfactant (61.5% ± 3.0% and 4.3% ± 1.5%, P <0.01) in sudden death infants, with the amount decreasing and the ratio of its components being disturbed, which is one of the important pathogenies of SIDS.