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Original Article
Neonatology (Perinatology)
The protective effect of CXC chemokine receptor 2 antagonist on experimental bronchopulmonary dysplasia induced by postnatal systemic inflammation
Seung Hyun Lee, Chang Won Choi
Clin Exp Pediatr. 2021;64(1):37-43.   Published online July 15, 2020
Question: Can CXC chemokine receptor 2 (CXCR2) antagonist preserve alveolarization by attenuating the inflammation induced by systemic lipopolysaccharide (LPS) administration in a rat model of bronchopulmonary dysplasia (BPD)?
Finding: CXCR2 antagonist significantly decreased neutrophil counts in bronchoalveolar lavage fluid and peripheral blood induced by systemic LPS administration and restored alveolarization in newborn rats.
Meaning: CXCR2 antagonist protected the lungs from the inflammation in a rat model of BPD.
Editorial
Neonatology (Perinatology)
Strategies to improve outcomes of bronchopulmonary dysplasia
Young Hwa Jung, Chang Won Choi, Beyong Il Kim
Clin Exp Pediatr. 2019;62(10):380-381.   Published online September 11, 2019
Review Article
Neonatology (Perinatology)
Chorioamnionitis: Is a major player in the development of bronchopulmonary dysplasia?
Chang Won Choi
Clin Exp Pediatr. 2017;60(7):203-207.   Published online July 31, 2017

Chorioamnionitis is an inflammation in the fetal membranes or placenta. When chorioamnionitis develops, fetal lungs are exposed to inflammatory cytokines and mediators via amniotic fluid. Because inflammation plays a pivotal role in the development of bronchopulmonary dysplasia (BPD), a chronic lung disease of prematurity, fetal lung inflammation induced by chorioamnionitis has been considered to be one of the major pathogenetic...

Case Report
A case of mucolipidosis II presenting with prenatal skeletal dysplasia and severe secondary hyperparathyroidism at birth
Ju Sun Heo, Ka Young Choi, Se Hyoung Sohn, Curie Kim, Yoon Joo Kim, Seung Han Shin, Jae Myung Lee, Juyoung Lee, Jin A Sohn, Byung Chan Lim, Jin A Lee, Chang Won Choi, Ee-Kyung Kim, Han-Suk Kim, Beyong Il Kim, Jung-Hwan Choi
Clin Exp Pediatr. 2012;55(11):438-444.   Published online November 23, 2012

Mucolipidosis II (ML II) or inclusion cell disease (I-cell disease) is a rarely occurring autosomal recessive lysosomal enzyme-targeting disease. This disease is usually found to occur in individuals aged between 6 and 12 months, with a clinical phenotype resembling that of Hurler syndrome and radiological findings resembling those of dysostosis multiplex. However, we encountered a rare case of an infant...

Misdiagnosis of fetus-in-fetu as meconium peritonitis
Yoon Joo Kim, Se Hyung Sohn, Ju Young Lee, Jin A Sohn, Eun Hee Lee, Ee Kyung Kim, Chang Won Choi, Han Suk Kim, Beyong Il Kim, Jung Hwan Choi
Clin Exp Pediatr. 2011;54(3):133-136.   Published online March 31, 2011

Fetus-in-fetu (FIF) is a rare congenital condition in which a fetiform mass is detected in the host abdomen and also in other sites such as the intracranium, thorax, head, and neck. This condition has been rarely reported in the literature. Herein, we report the case of a fetus presenting with abdominal cystic mass and ascites and prenatally diagnosed as meconium...

Review Article
Lung interstitial cells during alveolarization
Chang Won Choi
Clin Exp Pediatr. 2010;53(12):979-984.   Published online December 31, 2010

Recent progress in neonatal medicine has enabled survival of many extremely low-birth-weight infants. Prenatal steroids, surfactants, and non-invasive ventilation have helped reduce the incidence of the classical form of bronchopulmonary dysplasia characterized by marked fibrosis and emphysema. However, a new form of bronchopulmonary dysplasia marked by arrest of alveolarization remains a complication in the postnatal course of extremely low-birth-weight infants....

Original Article
Short-term clinical outcomes of late preterm infants
Ji Youn Na, Narimi Park, Eun Sun Kim, Jin-A Lee, Gyu Hong Shim, Jin-A Lee, Chang Won Choi, Ee-Kyung Kim, Han-Suk Kim, Beyong Il Kim, Jung-Hwan Choi
Clin Exp Pediatr. 2009;52(3):303-309.   Published online March 15, 2009
Purpose : To identify the short-term clinical outcomes of late preterm infants and to test the hypothesis that late preterm infants have more clinical problems during the early postnatal period than term infants. Methods : One hundred late preterm infants [gestational age (GA) 34+0-36+6 weeks] and the same number of term infants (GA 37+0-41+6 weeks) were randomly selected from 289 late...
Delayed closure effect in preterm infants with patent ductus arteriosus
Hyun Ju Lee, Gyu Hong Sim, Kyung Eun Jung, Jin A Lee, Chang Won Choi, Ee Kyung Kim, Han Suk Kim, Beyong Il Kim, Jung-Hwan Choi
Clin Exp Pediatr. 2008;51(10):1065-1070.   Published online October 15, 2008
Purpose : This study aims to determine whether early closure (within 7 d) of significant patent ductus arteriosus (PDA) with indomethacin or ligation reduces neonatal morbidity when compared with delayed closure (after 7 d). Methods : Fifty-eight extremely-low-birth-weight infants admitted to the NICU of Seoul National University Hospital from April 2005 to May 2007 with PDA were studied retrospectively. Results :...
Clinical characteristics of severe meconium aspiration syndrome
Chang Won Choi, Beyong Il Kim, Hyun Ju Lee, Kyoung Eun Joung, Gyu Hong Shim, In Suk Lim, Jin-A Lee, Ee-Kyung Kim, Han-Suk Kim, Jung-Hwan Choi
Clin Exp Pediatr. 2008;51(7):713-721.   Published online July 15, 2008
Purpose : This study aims to describe the clinical characteristics of severe meconium aspiration syndrome (MAS) which required mechanical ventilation over 48 h and to delineate the progress of respiratory failure and radiographic findings in severe MAS. Methods : Twelve infants admitted to the Neonatal Intensive Care Unit (NICU) of the Seoul National University Bundang Hospital diagnosed with severe MAS from...
Interpretation of screening for congenital adrenal hyperplasia in preterm infants
Hye Rim Chung, Choong Ho Shin, Sei Won Yang, Kyong Ah Yun, Young Ah Lee, So Eun Park, Chang Won Choi, Byung Il Kim, Jung Hwan Choi, Junghan Song
Clin Exp Pediatr. 2008;51(6):616-621.   Published online June 15, 2008
Purpose : This study was undertaken to identify factors that influence 17-OHP levels in preterm infants and to suggest a reasonable follow-up schedule of screening for congenital adrenal hyperplasia (CAH) in preterm infants. Methods : The 17-OHP concentrations in filter paper blood spots of 427 preterm infants were obtained. The effects of gestational age (GA), systemic diseases, and antenatal dexamethasone...
Clinical characteristics of severe respiratory syncytial virus infection requiring mechanical ventilation in neonatal period and early infancy
Seung Han Shin, Jae Ri Kim, Jin-A Lee, Chang Won Choi, Ee-Kyung Kim, Eun Hwa Choi, Han-Suk Kim, Beyong Il Kim, Hoan Jong Lee, Jung-Hwan Choi
Clin Exp Pediatr. 2008;51(4):372-376.   Published online April 15, 2008
Purpose : To identify clinical characteristics of severe respiratory syncytial virus (RSV) in neonatal period and early infancy and provide information in clinical practice. Methods : Twelve neonates and young infants (<6 months) who were infected by respiratory syncytial virus and required mechanical ventilation between March 2005 and July 2007 were enrolled. Diagnosis of RSV infection was made based on the...
Recent outcome of extremely low birth weight infants - The use of CRIB(clinical risk index for babies) Ⅱ score foranalyzing the survival rate -
Do-Hyeon Kim, So-Yeon Shim, Jae-Ri Kim, Seung-Han Shin, Eun Sun Kim, Kyoung-Eun Joung, Sang Duk Kim, Jin A Lee, Chang Won Choi, Ee-Kyung Kim, Han-Suk Kim, Beyong Il Kim, Jung-Hwan Choi
Clin Exp Pediatr. 2006;49(9):952-958.   Published online September 15, 2006
Purpose : The survival rate of infants weighing less than 1,000 g at birth(extremely low birth weight infants, ELBWI) has increased due to recent advances in perinatal and neonatal intensive care. The purpose of this study was to evaluate the survival rates of ELBWI born at Seoul National University Hospital during the last six years. Methods : A total of...
Evaluation of Perinatal and Management Factors Associated with Improved Survival in Extremely Low Birth Weight Infants
Sung Eun Park, Ga Won Jeon, Chang Won Choi, Jong Hee Hwang, Soo Hyun Koo, Yu Jin Kim, Chang Hoon Lee, Yun Sil Chang, Won Soon Park
Clin Exp Pediatr. 2005;48(12):1324-1329.   Published online December 15, 2005
Purpose : The aim of this study was to evaluate recent improvements in the survival rate of extremely low birth weight (ELBW) infants and to identify perinatal and management factors that are associated with improved survival. Methods : Two groups of ELBW infants who were admitted to our neonatal intensive care unit (NICU) during two distinct eras : November 1994-December...
Outcomes and Management of Fetal Infants with Birth Weight Below 500 g at a Tertiary Center
Yun Sil Chang, Yu Jin Kim, Soo Hyun Koo, Jang Hoon Lee, Jong Hee Hwang, Chang Won Choi, Jae Won Shim, Sung Shin Kim, Sun Young Ko, Eun Kyung Lee, Won Soon Park
Clin Exp Pediatr. 2005;48(9):939-945.   Published online September 15, 2005
Purpose : The purpose of this study was to report outcome of fetal infants with birth weight below 500 g known as lower limit of viability and to evaluate treatment characteristics and short-term morbidity of their survivors. Methods : We retrospectively analyzed the medical records of all fetal infants with birth weight below 500 g who were delivered at Samsung Medical...
The Effects of Early Enteral Feeding in Extremely Low Birth-Weight Infants
Ga Won Jeon, Sung Eun Park, Chang Won Choi, Jong Hee Hwang, Yun Sil Chang, Won Soon Park
Clin Exp Pediatr. 2005;48(7):711-715.   Published online July 15, 2005
Purpose : With the recent improved survival of extremely low birth weight infants(ELBWI), enteral feeding has become a major issue. This study investigates the effects of early enteral feeding in ELBWI on their morbidity, duration of hospitalization, and mortality. Methods : ELBWI admitted to the neonatal intensive care unit at Samsung Medical Center from November 1994 to April 2004 who survived...
Near-Infrared Spectroscopy for Monitoring Cerebral Hemodynamics in Hyperbilirubinemia-induced Newborn Piglets
Jong Hee Hwang, Chang Won Choi, Yun Sil Chang, Won Soon Park
Clin Exp Pediatr. 2005;48(6):649-654.   Published online June 15, 2005
Purpose : The present study examined how changes in cerebral hemodynamics in newborn piglets with bilirubin infusion can be evaluated by near infrared sepctroscopy(NIRS). Methods : Seventeen newborn piglets were randomly divided into the following three experimental groups : six in the control group(CG); seven in the bilirubin infusion group(BG), and four in the bilirubin infusion with 7-nitroindazole group(NG). To...
Single Cell Dissociation Methods for Flow Cytometric Cell Death Analysis of Hypoxia-Ischemia Injured Newborn Rat Pup Brain
Jong Hee Hwang, Dong Kyung Sung, Chang Won Choi, Saem Kang, Yun Sil Chang, Won Soon Park, Munhyang Lee
Clin Exp Pediatr. 2005;48(5):545-550.   Published online May 15, 2005
Purpose : Newborn brain tissue has to be dissociated into a single cell suspension for flow cytometric analysis of cell death during hypoxia-ischemia. Thus the development of a method to dissociate cells from the brain tissue with least damage and maintenance of membrane and antigen integrity remains the challenge for the in vivo application of this technique. We evaluated the...
Extubation Time by Birth Weight and the Predictors for Success/Failure at the First Extubation in Extremely Low Birth Weight Infants
Chang Won Choi, Sung Eun Park, Ga Won Jeon, Eun Jung Yoo, Jong Hee Hwang, Yun Sil Chang, Won Soon Park
Clin Exp Pediatr. 2005;48(5):488-494.   Published online May 15, 2005
Purpose : To outline the aspects of extubation by birth weight and find the predictors for success/ failure at the first extubation in extremely low birth weight infants. Methods : One hundred thirteen extremely low birth weight infants(<1,000 g) who were admitted to NICU at Samsung Seoul Hospital between Jan. 2000 and Jun. 2004 were enrolled. Clinical characteristics that are thought...
The Effect of Histologic Chorioamnionitis on the Development of Respiratory Distress Syndrome and Chronic Lung Disease in Preterm Infants
Heui seung Jo, Beyong Il Kim, Chang Won Choi, Jun Dong Park, Chong Jai Kim, Jung-Hwan Choi
Clin Exp Pediatr. 2004;47(2):150-156.   Published online February 15, 2004

Purpose: Histologic chorioamnionitis may play a role in the development of respiratory distress syndrome(RDS) and chronic lung disease(CLD) independently or through its association with preterm birth. We investigated the relationship between histologic chorioamnionitis and clinical complications including, RDS and CLD, of preterm infants. Methods: Clinical data were collected retrospectively from 478 preterm infants(gestational period≤34 weeks) who were admitted to the neonatal...
Effects of 7-Nitroindazole on Brain Cell Membrane Function and Energy Metabolism during Transient Global Cerebral Hypoxia-Ischemia and Reoxygenation-Reperfusion in Newborn Piglets
Chang Won Choi, Jong Hee Hwang, Yun Sil Chang, Won Soon Park
Clin Exp Pediatr. 2004;47(2):204-209.   Published online February 15, 2004
Purpose : Our study was undertaken to discover whether a selective neuronal nitric oxide synthase inhibitor, 7-nitroindazole, influences brain cell membrane function and energy metabolism during and after transient global hypoxia-ischemia(HI) in newborn piglets. Methods : Cerebral HI was induced by temporary complete occlusion of bilateral common carotid arteries and simultaneous breathing with 8% oxygen for 30 minutes, followed by release...
Change in the Limit of Viability of Fetal Infants
Chang Won Choi, Jong Hee Hwang, Jae Won Shim, Sung Sin Kim, Sun Young Ko, Eun Kyung Lee, Yun Sil Chang, Won Soon Park
Clin Exp Pediatr. 2003;46(12):1194-1199.   Published online December 15, 2003
Purpose : To determine the change in the limit of viability in fetal infants and the incidence of major complications in neonatal intensive care unit(NICU) at Samsung Medical Center(SMC). Methods : Sevety-three infants weighing less than 800 g at birth and 117 infants born earlier than 27 weeks gestational age, who were admitted to NICU at SMC between November 1994...
Classification and Risk Factors for Chronic Lung Disease(CLD) of Prematurity : Classical CLD Versus Atypical CLD
Chang Won Choi, Beyong Il Kim, Heui Seung Jo, Jun Dong Park, Chong Jae Kim, Bo Hyun Yoon, Jung-Hwan Choi
Clin Exp Pediatr. 2001;44(11):1222-1232.   Published online November 15, 2001
Purpose : We tried to classify the different type of CLD and assess the risk factors for classical CLD and atypical CLD. Methods : Retrospective cohort analysis was done in 120 preterm infants with birth weights less than 1,500 g who were admitted to NICU in Seoul National University Children's Hospital between Jan. 1993 and Dec. 1998 and survived more...
Case Report
A Case of Hepatoblastoma with Precocious Puberty
Chang Won Choi, Hyun Jin Park, Ki Woong Sung, Eun Sun Yoo, Hee Young Shin, Sei Won Yang, Hyo Seop Ahn
Clin Exp Pediatr. 2000;43(2):288-293.   Published online February 15, 2000
Hepatoblastoma is the most common primary malignant liver tumor in childhood. Most cases are boys generally below three years of age. Hepatoblastoma are associated with various non-metastatic syndromes. Rarely, human chorionic gonadotropin may be produced by the tumor. Ectopic gonadotropin production from this source is a rare cause of precocious puberty in boys. Since a report by Behrendt in 1931,...
Original Article
Effects of Cisapride on QTc Interval and QT Dispersion in Preterm Infants
Heui Seung Jo, Chang Won Choi, Yun Kyung Lee, Hee Seok Kim, Jun Dong Park, Jun Huh, Beyong Il Kim, Chung Il Noh, Jung-Hwan Choi
Clin Exp Pediatr. 2000;43(2):188-194.   Published online February 15, 2000
Purpose : Cisapride, a prokinetic agent, is widely used in preterm infants with feeding intolerance or gastroesophageal reflux. Although cisapride is regarded as a safe drug, increased QTc interval or ventricular arrhythmia has been reported in adults and neonates. So we prospectively examined the effects of cisapride on the QTc interval and QT dispersion in preterm infants. Methods : QTc interval...