To investigate the trends in the survival rate (SR) for very low birth weight infants (VLBW) and extremely low birth weight infants (ELBWI) in Korea, a total of 43 articles pertaining to SR were analyzed, covering the years from 1967 to 2007. The changes in SR were compared using 5 year periods. The SR for VLBWI has increased remarkably, from 31.8% in early 1960 to 65.8% in early 1990 and 78.8% in early 2000. The SR for ELBWI has increased from 8.2% in early 1960 to 37.4% in early 1990 and 62.4% in early 2000. The SR has improved steeply since early 1990. When the SRs for VLBWI in Korea were compared with those in the U.S.A. and Japan, the figures were 40%, 72%, and 79% in 1985; 65.8%, 82%, and 86% in 1990; 71.3%, 86%, and 88% in 1995; 78.8%, 86%, and 89% in 2000, respectively. Although the recent SRs for VLBWI and ELBWI in Korea has improved rapidly, they have not yet reached the levels in these highly developed countries. To obtain accurate statistics that could be represented as an SR for premature infants in Korea, we have to develop a nationwide network database project.
Developed Countries ; Humans ; Infant ; Infant, Extremely Low Birth Weight ; Infant, Low Birth Weight ; Infant, Newborn ; Infant, Premature ; Infant, Very Low Birth Weight ; Japan ; Korea ; Survival Rate

OBJECTIVES: To investigate the impact of the environmental layout of the neonatal intensive care unit (NICU) on clinical outcomes and neurological development in very/extremely preterm infants. METHODS: A total of 304 very/extremely preterm infants admitted to Children's Hospital of Chongqing Medical University between January 2021 and June 2022 within 24 hours after birth were included in this retrospective cohort study. Based on different environmental layouts in the NICU, the infants were divided into two groups: centralized layout group (n=157) and decentralized layout group (n=147). The clinical outcomes and Test of Infant Motor Performance (TIMP) scores at corrected gestational age between 34 to 51⁺⁶ weeks were compared between the two groups. RESULTS: The decentralized layout group had lower incidence rates of bronchopulmonary dysplasia (44.9% vs 62.4%, P<0.05) and intracranial hemorrhage (17.7% vs 28.0%, P<0.05) than the centralized layout group. The cure rate was higher in the decentralized layout group compared to the centralized layout group (68.7% vs 56.7%, P<0.05). The decentralized layout group had higher TIMP scores than the centralized layout group at corrected gestational age between 34 to 51⁺⁶ weeks (P<0.05). CONCLUSIONS The decentralized layout of the NICU exhibits positive effects on the clinical outcomes and early neurological development compared to the centralized layout in very/extremely preterm infants.
Humans ; Infant, Newborn ; Infant, Extremely Premature ; Infant, Premature, Diseases ; Infant, Very Low Birth Weight ; Intensive Care Units, Neonatal ; Retrospective Studies

PURPOSE: One of the major causes of bowel obstruction in extremely premature infants is a meconium obstruction. However, there are many challenges not only in the recognition and diagnosis, but also in the management of meconium obstruction. This study aimed to find perioperative clinical features and determine the postoperative course of meconium-related ileus in very low birth weight (VLBW) and extremely low birth weight (ELBW) infants. METHODS: We retrospectively reviewed the clinical data of premature infants (n = 11, VLBW infnats; n = 16, ELBW infants) with a meconium-related ileus who underwent operation for intractable ileus between January 2009 and May 2013. RESULTS: The average duration of conservative management was longer and postnatal age was older in ELBW infants than VLBW infants: 19.9 days vs. 11.5 days and 34.9 days vs. 19.2 days. The immediate postoperative course (day that beginning feeding and full feeding) was not significantly different based on birth weight, but the ELBW infants had slightly higher mortality. At 12 months of corrected age after operation, both average body weight and average height was below 10th percentile for growth in most infants (61.1%). CONCLUSION: There was a slightly high mortality in the ELBW infants, but two groups did not experience significant differences in the immediate postoperative course of meconium-related ileus. Nevertheless, considering their growth patterns, it is necessary to do a close follow-up and more aggressive nutritional management to achieve optimal growth and development in both patient groups.
Birth Weight ; Body Weight ; Diagnosis ; Growth and Development ; Humans ; Ileus* ; Infant* ; Infant, Extremely Low Birth Weight ; Infant, Extremely Premature ; Infant, Low Birth Weight* ; Infant, Newborn ; Infant, Premature ; Infant, Very Low Birth Weight* ; Meconium ; Mortality ; Retrospective Studies

Recently the Korean Neonatal Network (KNN) was established in order to enhance treatment outcomes further through the registration of very-low-birth-weight infants (VLBWI) data. The present study was conducted on 2,606 VLBWI, 2,386 registered and 220 un-registered, in the KNN participating centers, with the objective of reporting on recent survival rates of VLBWI in Korea and verifying the changing trends in survival rates with data from the 1960s and beyond. The study also aimed to compare the premature infants' survival rate in Korea with those reported in neonatal networks of other countries. The recent survival rate of VLBWI increased more than twice from 35.6% in the 1960s to 84.8%, and the survival rate of the extremely low birth weight infants (ELBWI) increased by more than 10 times, indicating improvement of the survival rate in premature infants with lower birth weight and gestational age. Comparison of VLBWI between countries showed improved survival rates according to each birth weight group in Canada, Australia-New Zealand, and European countries with Japan at the head, but in terms of comparison based on gestational age, differences, except for Japan, have been reduced. Efforts to increase the survival rate of premature infants in Korea with low birth rate are inevitable, and they should be the foundation of academic and clinical development based on its network with advanced countries.
Databases, Factual ; Europe ; Gestational Age ; Humans ; Infant ; Infant Mortality/*trends ; Infant, Extremely Low Birth Weight ; Infant, Newborn ; Infant, Premature ; *Infant, Very Low Birth Weight ; Japan ; Republic of Korea

OBJECTIVES: To assess the growth of preterm infants up to a corrected age of 24 months, and to understand the growth trend and pattern of preterm infants. METHODS: A preterm infant follow-up database was established based on the Internet Plus follow-up system. A total of 3 188 preterm infants who were born from April 2018 to April 2021 were enrolled. Their length, weight, and head circumference were recorded at birth and at the corrected ages of 1, 3, 6, 12, 18, and 24 months. The preterm infants were grouped by perinatal factors. The growth curves of these infants were plotted and compared with the International Fetal and Newborn Growth Consortium for the 21st Century (INTERGROWTH-21st) standard and World Health Organization (WHO) standard. RESULTS: The weight, length, and head circumference curves of each group of preterm infants grouped by various perinatal factors all rose rapidly within the corrected age of 6 months, but the growth rate slowed down after the corrected age of 6 months. Based on the actual age for the groups of preterm infants with different gestational ages (<28 weeks, 28-31 CONCLUSIONS The physical growth rate of preterm infants is faster within the corrected age of 6 months, and the growth rate slows down after the corrected age of 6 months. Preterm infants with a smaller gestational age need longer time to catch up in weight and head circumference. More attention should be paid to the physical growth of extremely preterm infants, extremely low birth weight infants, and small-for-gestational-age infants.
Cephalometry ; Child, Preschool ; Female ; Gestational Age ; Humans ; Infant ; Infant, Extremely Low Birth Weight ; Infant, Newborn ; Infant, Premature ; Infant, Small for Gestational Age ; Pregnancy

OBJECTIVE: To examine blood concentrations of free carnitine (FC) in preterm infants with different gestational ages (GA) and birth weights (BW). METHODS: A total of 3 368 preterm infants were enrolled as subjects. According to GA, they were divided into extremely preterm birth (EPTB) group (GA <28 weeks; n=39), very preterm birth (VPTB) group (28 ≤GA <32 weeks; n=405), moderately preterm birth (MPTB) group (32 ≤GA <34 weeks; n=507), and late preterm birth (LPTB) group (34 ≤GA <37 weeks; n=2 417); according to BW, they were divided into extremely low birth weight (ELBW) group (BW <1 000 g; n=36), very low birth weight (VLBW) group (1 000 g ≤BW <1 500 g; n=387), low birth weight (LBW) group (1 500 g ≤BW <2 500 g; n=1 873), and normal birth weight (NBW) group (2 500 g ≤ BW <4 000 g; n=1 072). Blood concentrations of FC were measured between 72 hours and 7 days after birth. RESULTS: The EPTB and VPTB groups had significantly higher FC concentrations than the MPTB and LPTB groups (P<0.05), and the MPTB group had significantly higher FC concentrations than the LPTB group (P<0.05). The lower limit of the 95% medical reference range of FC increased with the reduction in GA. The ELBW and VLBW groups had significantly higher FC concentrations than the LBW and NBW groups (P<0.05). The LBW group had significantly higher FC concentrations than the NBW group (P<0.05). The lower limit of the 95% medical reference range of FC increased with the reduction in BW. CONCLUSIONS There is a significant increase in blood FC concentrations in very/extremely preterm infants and very/extremely low birth weight infants, and tend to decrease with the increases in GA and BW.
Birth Weight ; Carnitine ; Female ; Gestational Age ; Humans ; Infant ; Infant, Extremely Low Birth Weight ; Infant, Newborn ; Infant, Premature ; Infant, Very Low Birth Weight ; Pregnancy

OBJECTIVETo analyze the clinical data of very low birth weight infants (VLBWIs) and extremely low birth weight infants (ELBWIs) (birth weight ≤1 200 g) and to provide prewarning indicators for prognostic evaluation and clinical intervention.

METHODSA retrospective analysis was performed on the clinical data of 108 VLBWIs and ELBWIs to investigate the maternal history of diseases during pregnancy, neonatal birth status, the process of diagnosis and treatment, and prognosis. Unconditional logistic regression analysis was used to determine prognostic factors.

RESULTSOf the 108 preterm infants, 15 had a birth weight of <800 g, 29 had a birth weight of 800-999 g, and 64 had a birth weight of 1000-1200 g. The mortality was 33.3% (36/108). Placenta previa and Apgar score ≤3 at 5 minutes were the main risk factors for death within 24 hours of birth; premature rupture of membrane, Apgar score ≤3 at 5 minutes, and pulmonary hemorrhage were the main risk factors for death between 24 hours and 7 days after birth; late-onset sepsis caused by invasive fungal infection was an independent risk factor for death over 7 days after birth, while pregnancy-induced hypertension syndrome was a protective factor.

CONCLUSIONSThe mortality in VLBWIs and ELBWIs is relatively high, and the prognostic factors vary between preterm infants of different ages. Clinicians should discuss management options for the infants on the basis of these findings to increase the survival of preterm infants.

An abnormal plasma glucose concentration is one of the most commonly encountered metabolic problems in the intensive care of premature infants. Compared with term infants, glycogen reserves are lower in the preterm neonatal liver. Despite this, preterm infants are at a greater risk of hyperglycemia than term infants are, which is owing to comparable production rate of endogenous glucose and impaired ability to reduce glucose production rate in response to hyperglycemia. Debate continues about the normal plasma glucose concentrations and the guideline for glucose control in premature infants. Some randomized controlled trials in very low birth weight infants demonstrated little clinical benefit of tight glycemic control with early insulin therapy and higher calorie intake in terms of mortality, morbidities and growth parameters. Compared with term infants, preterm infants have limited endocrine and metabolic adaptation to hypoglycemia. In any case, hypoglycemia in premature infants should not be considered a physiologic condition. The operational criteria for intervention of hypoglycemia should be different from that in term infants. Continuous non-invasive glucose monitoring is a promising tool considering the principle of minimal handling of extremely premature infants. However, the clinical implication of abnormal glucose concentrations, previously undetected on intermittent measurements, is unclear.
Blood Glucose ; Glucose* ; Glycogen ; Homeostasis* ; Humans ; Hyperglycemia ; Hypoglycemia ; Infant ; Infant, Extremely Premature ; Infant, Newborn ; Infant, Premature* ; Infant, Very Low Birth Weight ; Insulin ; Critical Care ; Liver ; Mortality

OBJECTIVE: To study the clinical features of very preterm small-for-gestational-age infants born by cesarean section due to severe preeclampsia. METHODS: Forty-two small-for-gestational-age infants who were admitted from August 2017 to July 2018 and were born due to severe preeclampsia were enrolled as the observation group. Forty very preterm infants who were born to healthy mothers since uterine contractions could not be suppressed were enrolled as the control group. Perinatal features, clinical manifestations of infection, complications, and clinical outcomes were analyzed for the two groups. RESULTS: Within 6 hours and 2-3 days after birth, the observation group had significantly lower white blood cell count (WBC), absolute neutrophil count (ANC), and platelet count (PLT) than the control group ( CONCLUSIONS Very preterm small-for-gestational-age infants born due to severe preeclampsia have a high incidence rate of infection and severe conditions. Early manifestations include reductions in the infection indicators WBC, ANC, and PLT, and CRP does not increase significantly in the early stage and gradually increases at 2-3 days after birth. Most of these infants require invasive ventilation after birth, with bronchopulmonary dysplasia as the main complication. Clinical changes should be closely observed and inflammatory indicators should be monitored for early identification of infection, timely diagnosis, and timely adjustment of antibiotic treatment, so as to improve the outcome.
Bronchopulmonary Dysplasia ; Cesarean Section ; Female ; Gestational Age ; Humans ; Infant ; Infant, Extremely Premature ; Infant, Newborn ; Infant, Premature, Diseases ; Infant, Very Low Birth Weight ; Pre-Eclampsia ; Pregnancy

OBJECTIVES: To investigate whether evidence-based standardized nutrition protocol can facilitate the establishment of full enteral nutrition and its effect on short-term clinical outcomes in very preterm/very low birth weight infants. METHODS: A retrospective analysis was performed on the medical data of 312 preterm infants with a gestational age of ≤32 weeks or a birth weight of <1 500 g. The standardized nutrition protocol for preterm infants was implemented in May 2020; 160 infants who were treated from May 1, 2019 to April 30, 2020 were enrolled as the control group, and 152 infants who were treated from June 1, 2020 to May 31, 2021 were enrolled as the test group. The two groups were compared in terms of the time to full enteral feeding, the time to the start of enteral feeding, duration of parenteral nutrition, the time to recovery to birth weight, the duration of central venous catheterization, and the incidence rates of common complications in preterm infants. RESULTS: Compared with the control group, the test group had significantly shorter time to full enteral feeding, time to the start of enteral feeding, duration of parenteral nutrition, and duration of central venous catheterization and a significantly lower incidence rate of catheter-related bloodstream infection (P<0.05). There were no significant differences between the two groups in the mortality rate and the incidence rate of common complications in preterm infants including grade II-III necrotizing enterocolitis (P>0.05). CONCLUSIONS Implementation of the standardized nutrition protocol can facilitate the establishment of full enteral feeding, shorten the duration of parenteral nutrition, and reduce catheter-related bloodstream infection in very preterm/very low birth weight infants, without increasing the risk of necrotizing enterocolitis.
Birth Weight ; Enteral Nutrition/methods* ; Enterocolitis, Necrotizing/prevention & control* ; Humans ; Infant ; Infant, Extremely Premature ; Infant, Newborn ; Infant, Very Low Birth Weight ; Retrospective Studies ; Sepsis/epidemiology*