Abstract：
OBJECTIVE: To study the influence of enteral feeding initiation time on intestinal flora and metabolites in very low birth weight (VLBW) infants.
METHODS: A total of 29 VLBW infants who were admitted to the Department of Neonatology, Children\'s Hospital of Chongqing Medical University, from June to December, 2020, were enrolled as subjects. According to the enteral feeding initiation time after birth, the infants were divided into two groups: <24 hours (n=15) and 24-72 hours (n=14). Fecal samples were collected at weeks 2 and 4 of hospitalization, and 16S rDNA high-throughput sequencing and gas chromatography-mass spectrometry were used to analyze the microflora and short-chain fatty acids (SCFAs) respectively in fecal samples.
RESULTS: The analysis of microflora showed that there was no significant difference between the two groups in Chao index (reflecting the abundance of microflora) and Shannon index (reflecting the diversity of microflora) at weeks 2 and 4 after birth (P>0.05). The analysis of flora composition showed that there was no significant difference in the main microflora at the phylum and genus levels between the two groups at weeks 2 and 4 after birth (P>0.05). The comparison of SCFAs between the two groups showed that the <24 hours group had a significantly higher level of propionic acid than the 24-72 hours group at week 4 (P<0.05), while there was no significant difference in the total amount of SCFAs and the content of the other SCFAs between the two groups (P>0.05).
CONCLUSIONS: Early enteral feeding has no influence on the diversity and abundance of intestinal flora in VLBW infants, but enteral feeding within 24 hours can increase the level of propionic acid, a metabolite of intestinal flora.
目的: 探讨不同肠内营养开始时间对极低出生体重儿肠道菌群及代谢产物的影响。方法: 选取2020年6~12月重庆医科大学附属儿童医院新生儿科收治的29例极低出生体重儿为研究对象，根据生后肠内营养开始时间（开奶时间）不同分为<24 h组（n=15）和24~72 h组（n=14）。采集患儿住院第2周和第4周的粪便标本，采用16S rDNA高通量测序和气相色谱-质谱法分别分析粪便样本的菌群和短链脂肪酸（short-chain fatty acids，SCFAs）。结果: 菌群结果显示，生后第2周和第4周2组间Chao指数（反映菌群丰富度）和Shannon指数（反映菌群多样性）差异无统计学意义（P>0.05）。菌群组成分析中，生后第2周和第4周2组间主要菌群在门、属水平上差异无统计学意义（P>0.05）。2组SCFAs比较显示，开奶时间<24 h组第4周丙酸高于24~72 h组（P<0.05），而2组SCFAs总量及其他各SCFAs含量差异无统计学意义（P>0.05）。结论: 较早开始肠内营养对极低出生体重儿肠道菌群多样性和丰富度无影响，但24 h内开始肠内营养可以使代谢产物丙酸水平增高。.
METHODS: A total of 29 VLBW infants who were admitted to the Department of Neonatology, Children\'s Hospital of Chongqing Medical University, from June to December, 2020, were enrolled as subjects. According to the enteral feeding initiation time after birth, the infants were divided into two groups: <24 hours (n=15) and 24-72 hours (n=14). Fecal samples were collected at weeks 2 and 4 of hospitalization, and 16S rDNA high-throughput sequencing and gas chromatography-mass spectrometry were used to analyze the microflora and short-chain fatty acids (SCFAs) respectively in fecal samples.
RESULTS: The analysis of microflora showed that there was no significant difference between the two groups in Chao index (reflecting the abundance of microflora) and Shannon index (reflecting the diversity of microflora) at weeks 2 and 4 after birth (P>0.05). The analysis of flora composition showed that there was no significant difference in the main microflora at the phylum and genus levels between the two groups at weeks 2 and 4 after birth (P>0.05). The comparison of SCFAs between the two groups showed that the <24 hours group had a significantly higher level of propionic acid than the 24-72 hours group at week 4 (P<0.05), while there was no significant difference in the total amount of SCFAs and the content of the other SCFAs between the two groups (P>0.05).
CONCLUSIONS: Early enteral feeding has no influence on the diversity and abundance of intestinal flora in VLBW infants, but enteral feeding within 24 hours can increase the level of propionic acid, a metabolite of intestinal flora.
目的: 探讨不同肠内营养开始时间对极低出生体重儿肠道菌群及代谢产物的影响。方法: 选取2020年6~12月重庆医科大学附属儿童医院新生儿科收治的29例极低出生体重儿为研究对象，根据生后肠内营养开始时间（开奶时间）不同分为<24 h组（n=15）和24~72 h组（n=14）。采集患儿住院第2周和第4周的粪便标本，采用16S rDNA高通量测序和气相色谱-质谱法分别分析粪便样本的菌群和短链脂肪酸（short-chain fatty acids，SCFAs）。结果: 菌群结果显示，生后第2周和第4周2组间Chao指数（反映菌群丰富度）和Shannon指数（反映菌群多样性）差异无统计学意义（P>0.05）。菌群组成分析中，生后第2周和第4周2组间主要菌群在门、属水平上差异无统计学意义（P>0.05）。2组SCFAs比较显示，开奶时间<24 h组第4周丙酸高于24~72 h组（P<0.05），而2组SCFAs总量及其他各SCFAs含量差异无统计学意义（P>0.05）。结论: 较早开始肠内营养对极低出生体重儿肠道菌群多样性和丰富度无影响，但24 h内开始肠内营养可以使代谢产物丙酸水平增高。.
摘要：
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