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Review Article
Nephrology (Genitourinary)
X-linked hypophosphatemic rickets: from diagnosis to management
Eujin Park, Hee Gyung Kang
Clin Exp Pediatr. 2024;67(1):17-25.   Published online June 14, 2023
· X-linked hypophosphatemia (XLH), the most common cause of hypophosphatemic rickets, affects 1/20,000 people.
· XLH is caused by a loss-of-function mutation of the PHEX gene.
· Its main pathogenesis is elevated fibroblast growth factor-23 (FGF23) level.
· Burosumab, an FGF23 inhibitor, was developed in the early 2000s.
· Burosumab was approved in Korea in 2020 for XLH patients aged 1+ years with radiographic evidence of bone disease.
Infection
COVID-19 among infants: key clinical features and remaining controversies
Nevio Cimolai
Clin Exp Pediatr. 2024;67(1):1-16.   Published online November 27, 2023
· Clinical studies of coronavirus disease 2019 (COVID-19) in infants should be supported by rigorous laboratory diagnostic criteria.
· Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spreads to infants similarly to other viral respiratory infections.
· Among infants ≤1 year of age beyond the immediate postpartum period, COVID-19 is relatively mild, but even the low risk of severe disease requires prevention.
· Comorbidities increase infection vulnerability and complications in infants.
· Clinical and laboratory data do not sufficiently distinguish COVID-19 from other respiratory viral infections.
· Coinfection with SARS-CoV-2 is uncommon among infants.
· Unique infection sequelae, including multi-inflammatory syndrome in children and neonates and long COVID require further study and refinement of diagnostic criteria.
· Infection control standards applied to mother-infant dyads should be tempered by standard preventive strategies, maternal input, accommodation potential, and overall safety.
· Maternal vaccination prevents disease in early infancy.
Original Article
Gastroenterology
Risk factors of prolonged diarrhea in children under 2 years old
Dedy Rahmat, Agus Firmansyah, Ina S. Timan, Saptawati Bardosono, Joedo Prihartono, Pramita Gayatri
Clin Exp Pediatr. 2023;66(12):538-544.   Published online November 16, 2023
Question: What are the risk factors for prolonged diarrhea in children under 2 years old?
Finding: History of antibiotic use, zinc deficiency, and elevated fecal alpha-1 antitrypsin levels were the main risk factors of prolonged diarrhea in children under 2 years old with acute diarrhea.
Meaning: Rational antibiotic usage is necessary as well as thorough testing of serum zinc level and fecal alpha-1 antitrypsin levels.
General Pediatrics
Virtual reality for pain reduction during intravenous injection in pediatrics: a systematic review and meta-analysis of controlled clinical trials
Ensiyeh Jenabi, Saeid Bashirian, Amir Mohammad Salehi, Masoud Rafiee, Mozhdeh Bashirian
Clin Exp Pediatr. 2023;66(12):533-537.   Published online June 14, 2023
Question: This is the first meta-analysis to examine published evidence of the effectiveness of virtual reality at reducing pain during pediatric intravenous injections.
Finding: Our results suggest that virtual reality effectively reduces pain associated with intravenous injections in pediatric patients.
Meaning: These findings suggest the importance of virtual reality in decreasing the pain of intravenous injections among children.
Editorial
Infection
COVID-19 infection and vaccination among children
Amnuay Kleebayoon, Viroj Wiwanitkit
Clin Exp Pediatr. 2023;66(12):531-532.   Published online August 30, 2023
· Coronavirus disease 2019 (OVID-19) infection and immunization have been linked with kidney problems; however, causality has not been proven.
· Concern about confounders is usually needed.
· Correspondence about a published article on the COVID-19 vaccine
Review Article
Endocrinology
Applications of genomic research in pediatric endocrine diseases
Ja Hye Kim, Jin-Ho Choi
Clin Exp Pediatr. 2023;66(12):520-530.   Published online June 14, 2023
· Recent advances in molecular genetics have improved our understanding of pediatric endocrine disorders and are now used in mainstream medical practice.
· Genome-wide association studies can increase our understanding of the biological mechanisms of disease and inform new therapeutic options.
· The identification of founder mutations leads to the efficient localization of the genes underlying Mendelian disorders.
· Next-generation sequencing technologies benefit clinical practice and research of pediatric endocrinology.
Nonalcoholic fatty liver disease and insulin resistance in children
Kyungchul Song, Ho-Seong Kim, Hyun Wook Chae
Clin Exp Pediatr. 2023;66(12):512-519.   Published online January 9, 2023
· The prevalence of pediatric nonalcoholic fatty liver disease (NAFLD) increased from 8.2% in 2009 to 12.1% in 2018 in Korea.
· Laboratory tests, biomarkers, and imaging studies are used for the early detection of NAFLD.
· Insulin resistance is closely related to NAFLD.
Allergy
Natural course of IgE-mediated food allergy in children
Kyunguk Jeong, Sooyoung Lee
Clin Exp Pediatr. 2023;66(12):504-511.   Published online June 14, 2023
· Dendritic, regulatory T, and regulatory B cells significantly contribute to the natural course of food allergy.
· Cow’s milk and hen’s egg allergies tend to resolve in earlier childhood but recent studies show that 50% of patients still persist into school age.
· The potential factors affecting the natural course of food allergy are age at diagnosis, symptom severity, sensitization status and its change rate, and external factors such as diet and interventions.
· There is a considerable possibility of food allergy outgrow if specific IgE levels are 2–5 kUA/L or less, but other factors such as age and recent symptoms should be considered together.
· With a clear understanding of the natural course of food allergy, pediatricians can provide appropriate assessment and interventions to our patients, and consequently can help patients overcome their food allergy and improve the social safety net.
Letter to the Editor
Neonatology (Perinatology)
Association between feeding intolerance and intestinal dysbiosis in very premature infants
Putri Maharani Tristanita Marsubrin, Agus Firmansyah, Rinawati Rohsiswatmo, Zakiudin Munasir, Saptawati Bardosono, Safarina G. Malik, Yuditiya Purwosunu, Ina S. Timan, Tetty Yuniati, Maya Yulindhini
Clin Exp Pediatr. 2023;66(11):501-503.   Published online October 24, 2023
Original Article
Neonatology (Perinatology)
Association between maternal coronavirus disease 2019 and transient tachypnea of the newborn: a single-center study
Sung Hee Lee, Ju Hyun Jin, Jong Ha Yoo, Shin Won Yoon
Clin Exp Pediatr. 2023;66(11):493-500.   Published online October 24, 2023
Question: What are the adverse clinical outcomes of neonates of coronavirus disease 2019 (COVID-19)–infected mothers?
Finding: Infants of mothers with COVID-19 were at significantly increased risk of transient tachypnea of the newborn (TTN), use of noninvasive ventilation, and need for supplemental oxygen (P<0.05).
Meaning: Neonates of mothers with COVID-19 are at risk of TTN and require respiratory support. Close monitoring is essential to ensuring timely intervention if required.
Developmental and Behavioral Medicine
Attention-deficit/hyperactive-impulsive disorder symptoms among grade 1 students with reading disorder in Thailand
Patcharapun Sarisuta, Issarapa Chunsuwan, Tippawan Hansakunachai, Paskorn Sritipsukho
Clin Exp Pediatr. 2023;66(11):485-492.   Published online October 24, 2023
Question: Would students with reading disorder have a significantly higher prevalence of attention-deficit/hyperactiveimpulsive disorder (ADHD) symptoms than neurotypical students?
Finding: Students at risk of reading disorder exhibited significant ADHD symptoms compared with those not at risk of reading disorder according to all presentations of teacher assessments versus only for predominantly inattentive presentations of the parental assessments.
Meaning: Students with reading disorder have a significantly higher prevalence of ADHD symptoms than neurotypical students. Sex, parental education level, average family income, and children’s school affiliation significantly influenced reading disorder prevalence.
Gastroenterology
Inferior vena cava to aorta ratio in dehydrated pediatric patients: a systematic review and meta-analysis
Gilbert Sterling Octavius, Michelle Imanuelly, Johan Wibowo, Nadia Khoirunnisa Heryadi, Melanie Widjaja
Clin Exp Pediatr. 2023;66(11):477-484.   Published online June 14, 2023
Question: The inferior vena cava to aorta (IVC/Ao) ratio measured via ultrasound has been touted as a promising noninvasive technique to assess clinically significant dehydration in pediatric patients.
Finding: Our meta-analysis found that IVC/Ao ratio had a positive likelihood ratio of 3.2 (95% confidence interval [CI], 2.1–5.1) and negative likelihood ratio of 0.18 (95% CI, 0.12–0.28).
Meaning: Hence, IVC/Ao ratio is insufficient to exclude or confirm significant dehydration in pediatric patients.
Editorial
Gastroenterology
Noninvasive and simple, but accurate? Meta-analysis of evidence-based point-of-care ultrasound for assessing dehydration in children
Jin-Hee Oh
Clin Exp Pediatr. 2023;66(11):475-476.   Published online July 11, 2023
· Point-of-care ultrasound imaging, including measurement of the inferior vena cava/aorta ratio, is powerful for evaluating the hemodynamic status of pediatric patients.
· Owing to the limited feasibility of randomized clinical trials and insufficient data in children, imaging tools require validation.
· Objective validity meta-analyses of imaging studies can affect clinical decision-making and serve as a cornerstone for evidence-based practice in pediatrics.
Review Article
Pulmonology
Long COVID in children and adolescents: prevalence, clinical manifestations, and management strategies
Eun Kyo Ha, Ju Hee Kim, Man Yong Han
Clin Exp Pediatr. 2023;66(11):465-474.   Published online June 19, 2023
· Current definitions of long coronavirus disease (COVID) in children and adolescents vary in duration, ranging from 4 to 12 weeks or more.
· The clinical spectrum of long COVID in children and adolescents comprises a wide range of symptoms and might be a multisystem disorder.
· Persistent health problems with a prevalence of 1%–66.5% were reported in children and adolescents after COVID-19, with a higher incidence of persistent single or multiple symptoms.
Developmental and Behavioral Medicine
Spontaneous movements as prognostic tool of neurodevelopmental outcomes in preterm infants: a narrative review
Hyun Iee Shin, Myung Woo Park, Woo Hyung Lee
Clin Exp Pediatr. 2023;66(11):458-464.   Published online May 16, 2023
· Spontaneous movements can be useful to evaluate neuronal integrity in preterm infants.
· In General Movements Assessment, continuous cramped synchronized movements and absent fidgety movements can indicate high-risk infants for cerebral palsy.
· Recent advances in machine learning techniques have led to the automated prediction of cerebral palsy based on infantile spontaneous movements.
Letter to the Editor
Allergy
Increased serum eosinophilic cationic protein in children with nonspecific chronic cough
Young Hwan Kim, Yoon Young Jang, Jieun Jeong, Hai Lee Chung
Clin Exp Pediatr. 2023;66(10):455-457.   Published online September 14, 2023
Original Article
Developmental and Behavioral Medicine
Impact of short and intensive art-based intervention on symptomatology and social interactions among children with autism spectrum disorder
Deldar Morad Abdulah, Bayar Mohammed Omar Abdulla, Pranee Liamputtong
Clin Exp Pediatr. 2023;66(10):447-454.   Published online September 14, 2023
Question: Does a short and intensive art-based intervention affect symptoms and social interactions among children with autism spectrum disorder (ASD)?
Finding: The short and intensive art-based intervention did not affect symptoms in children with ASD level 2 or 3, including social awareness, social cognition, social communication, social motivation, and autistic mannerisms.
Meaning: The short and intensive art-based intervention did not improve the symptoms of patients with ASD.
Neonatal risk factors associated with attention-deficit/hyperactivity disorder: an umbrella review
Ensiyeh Jenabi, Erfan Ayubi, Sajjad Farashi, Saeid Bashirian, Fereshteh Mehri
Clin Exp Pediatr. 2023;66(10):441-446.   Published online July 14, 2023
Question: The risk factors for attention deficit hyperactivity disorder (ADHD), such as breastfeeding, congenital heart disease, and low birth weight, in neonates are not well understood.
Finding: This umbrella review obtained significant effect sizes for ADHD for congenital heart disease (odds ratio [OR], 3.04), low birth weight (OR, 2.25), never breastfed (OR, 1.55), and Apgar score (OR, 1.30).
Meaning: Congenital heart disease, low birth weight, lack of breastfeeding, and Apgar scores were significant factors for ADHD.
Editorial
Immunology
Systemic autoinflammatory disorders: autoinflammatory and autoimmune disorders
Young Dae Kim
Clin Exp Pediatr. 2023;66(10):439-440.   Published online July 4, 2023
· Systemic autoinflammatory disorders (SAIDs) typically have an early onset in life, and may have close relatives may have similar disease.
· SAIDs should be suspected in any patient, especially children, who experience persistent or recurrent inflammatory episodes that fail to fit the pattern of other established diseases.
· Advancements in the understanding of autoinflammation will provide novel diagnostic and therapeutic options for SAIDs patients.
Review Article
Immunology
Systemic autoinflammatory disorders
Dae Chul Jeong
Clin Exp Pediatr. 2023;66(10):432-438.   Published online June 14, 2023
· Systemic autoinflammatory disorders (SAID) are disorders caused by dysregulation of the innate immunity with genetic background, leading to recurrent episodes of systemic inflammation.
· SAID is characterized by recurrent acute inflammatory responses including fever or skin manifestations, unrelated with infection or malignancy.
· Diagnosis is based on family and long-term history with detailed clinical and laboratory manifestations during febrile periods.
Nephrology (Genitourinary)
Kidney complications associated with COVID-19 infection and vaccination in children and adolescents: a brief review
Hee Sun Baek, Min Hyun Cho
Clin Exp Pediatr. 2023;66(10):424-431.   Published online June 28, 2023
Several observational studies have shown that acute kidney injury affects up to 46% of children and adolescents who develop severe postinflammatory responses, such as multisystem inflammatory syndrome in childhood, due to coronavirus disease 2019 (COVID-19). Although causality has not been established, some cases of glomerulopathy or nephrotic syndrome occurring after COVID-19 infection or vaccination have been reported. Therefore, kidney complications associated with these conditions in children and adolescents warrant attention.
Infection
Safety monitoring of COVID-19 vaccines: February 26, 2021, To June 4, 2022, Republic of Korea
Yeon-Kyeng Lee, Yunhyung Kwon, Yesul Heo, Eun Kyoung Kim, Seung Yun Kim, Hoon Cho, Seontae Kim, Mijeong Ko, Dosang Lim, Soon-Young Seo, Enhi Cho
Clin Exp Pediatr. 2023;66(10):415-423.   Published online June 13, 2023
· Enhanced safety monitoring system of coronavirus disease 2019 (COVID-19) vaccines were implemented to detect signals rapidly as part of the national COVID-19 vaccination program.
· As of June 4, 2023, reported adverse events after COVID-19 vaccination was 0.38% among 125,107,883 doses of COVID- 19 vaccines administered.
· Most reported adverse reactions after COVID-19 vaccinations have shown nonserious and mild intensity.
Correspondence
Cardiology
The authors reply: Age-, sex-, and height-based blood pressure reference charts, Yazd children 6–18 years, Iran
Seyedeh Mahdieh Namayandeh, Nastran Ahmadi, Seyed Mahmood Sadr
Clin Exp Pediatr. 2023;66(9):414-414.   Published online June 14, 2023
General Pediatrics
Letter to the editor: Age-, sex-, and height-based blood pressure reference charts, Yazd children 6-18 years, Iran
Amar Taksande
Clin Exp Pediatr. 2023;66(9):412-413.   Published online October 27, 2021
Original Article
Critical Care Medicine
Timing of parenteral nutrition initiation in critically ill children: a randomized clinical trial
Nagwan Y. Saleh, Hesham M. Aboelghar, Nehad B. Abdelaty, Mohamed I. Garib, Asmaa A. Mahmoud
Clin Exp Pediatr. 2023;66(9):403-411.   Published online June 14, 2023
Question: What is the ideal initiation timing of parenteral nutrition for critically ill children?
Finding: This randomized clinical trial of 140 children examined the effects of an early or late start of parenteral nutrition on mechanical ventilation need (primary outcome) and length of stay and mortality (secondary outcomes).
Meaning: Children who received early versus late parenteral nutrition had lower mechanical ventilation need and duration.
Gastroenterology
Relationship between nonalcoholic fatty liver disease and hyperandrogenemia in adolescents with polycystic ovary syndrome
Ozlem Kara, Hanife Aysegul Arsoy, Murat Keskin
Clin Exp Pediatr. 2023;66(9):395-402.   Published online June 14, 2023
Question: Is polycystic ovary syndrome (PCOS) a risk factor for nonalcoholic fatty liver disease (NAFLD) in adolescents?
Finding: The frequency of NAFLD did not increase in adolescents with PCOS. However, hyperandrogenemia was a risk factor for NAFLD.
Meaning: Adolescents with PCOS and hyperandrogenemia should be closely monitored for hepatic steatosis.
Review Article
Neonatology (Perinatology)
Treatment of congenital cytomegalovirus infection
Gyu Hong Shim
Clin Exp Pediatr. 2023;66(9):384-394.   Published online December 28, 2022
· Congenital cytomegalovirus (CMV) infection is among the most common causes of nongenetic sensorineural hearing loss.
· Congenital CMV is initially treated with intravenous ganciclovir for 2–6 weeks and switched to oral valganciclovir, or with oral valganciclovir for the entire 6-month period.
· Infants with congenital CMV require periodic monitoring of absolute neutrophil count, platelet count, and blood urea nitrogen, creatinine, liver function tests, audiological, ophthalmological, and developmental tests during antiviral medication.
Gastroenterology
Prevalence, risk factors, and treatment of small intestinal bacterial overgrowth in children
Yu Kyung Cho, Jin Lee, Chang Nyol Paik
Clin Exp Pediatr. 2023;66(9):377-383.   Published online August 21, 2023
· Pediatric small intestinal bacterial overgrowth (SIBO) manifestations range from nonspecific abdominal symptoms to malabsorption or malnutrition.
· SIBO is prevalent in children and adolescents with functional abdominal pain disorders.
· Predisposing factors include disturbed intestinal motility, altered anatomy, and/or abnormal body defense systems against intestinal bacteria.
· Breath tests are safe and noninvasive.
· Treatment principles include managing predisposing conditions, nutritional support, symptom control, and antibiotics.
Other
Hearing loss in neonates and infants
Goun Choe, Su-Kyoung Park, Bong Jik Kim
Clin Exp Pediatr. 2023;66(9):369-376.   Published online January 9, 2023
· Congenital hearing loss is common, with an approximate incidence of 1.5 per 1,000 newborns and affecting 1.2%–11% of preterm and 1.6%–13.7% of neonatal intensive care unit neonates.
· Etiologies vary, and up to 80% of cases are genetic.
· Newborn hearing screenings follow the 1-3-6 rule, and babies at high risk of hearing loss should be referred to otolaryngology for early detection and timely intervention.
Letter to the Editor
Infection
SARS-CoV-2 fecal shedding pattern in pediatric patients with acute COVID-19 or COVID-19-associated multisystem inflammatory syndrome
Setareh Mamishi, Fatemeh Jalali, Sepideh Benvari, Babak Pourakbari, Mohammad Reza Abdolsalehi, Reihaneh Hosseinpour Sadeghi, Mohammad Shahbabaie, Amene Navaeian, Shima Mahmoudi
Clin Exp Pediatr. 2023;66(8):366-368.   Published online June 14, 2023