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Review Article
Infection
Effects of nasopharyngeal microbiota in respiratory infections and allergies
Hyun Mi Kang, Jin Han Kang
Clin Exp Pediatr. 2021;64(11):543-551.   Published online April 15, 2021
· The nasal microbiota varies with age and is shaped by various factors in healthy individuals.
· The pathological condition of the respiratory tract appears to be associated with reduced nasal microbiota biodiversity, while dysbiosis is involved in the pathophysiology of many respiratory diseases, including otitis, sinusitis, allergic diseases, and lower respiratory infections.
Nephrology (Genitourinary)
Obesity and chronic kidney disease: prevalence, mechanism, and management
Hyung Eun Yim, Kee Hwan Yoo
Clin Exp Pediatr. 2021;64(10):511-518.   Published online April 6, 2021
· Obesity is strongly associated with the development and progression of chronic kidney disease.
· Altered renal hemodynamics, metabolic effects, and lipid nephrotoxicity may play a key role in the development of obesity-related kidney disease.
· Children born to obese mothers are at increased risk of developing obesity and chronic kidney disease later in life.
· A multilevel approach is needed to prevent obesity and related chronic diseases.
Immunology
Modern diagnostic capabilities of neonatal screening for primary immunodeficiencies in newborns
Evgenia Olegovna Khalturina, Natalia Dmitrievna Degtyareva, Anastasiia Vasi’evna Bairashevskaia, Alena Valerievna Mulenkova, Anna Vladimirovna Degtyareva
Clin Exp Pediatr. 2021;64(10):504-510.   Published online March 25, 2021
· Neonatal screening for primary immunodeficiency diseases (PIDs) enables early diagnosis and subsequent initiation of therapy.
· Excision of T-cell receptors and kappa-recombination excision circles are cheaper alternative PID screening methods.
· Sanger DNA sequencing remains the reference method for detecting PID; however, next-generation sequencing technology is increasingly used to diagnose it.
· Here we developed a graphical algorithm for diagnosing primary immunodeficiency syndrome based on modern methods of screening for primary immunodeficiencies in newborns.
Neurology
Recent update on reading disability (dyslexia) focused on neurobiology
Sung Koo Kim
Clin Exp Pediatr. 2021;64(10):497-503.   Published online March 2, 2021
·Neurobiological studies using functional brain imaging have uncovered the reading pathways, brain regions involved in reading, and neurobiological abnormalities of dyslexia.
·An accurate diagnosis and timely specialized intervention are important in children with dyslexia. When national infant development screening tests have been conducted as in Korea, if a language developmental delay and early predictors of dyslexia are detected, the progression to dyslexia should be carefully observed and early intervention provided.
Infection
Consideration in treatment decisions for refractory Mycoplasma pneumoniae pneumonia
Hye-Kyung Cho
Clin Exp Pediatr. 2021;64(9):459-467.   Published online February 10, 2021
• To avoid unnecessary exposure to secondary antibiotics, it is needed to diagnose Mycoplasma pneumoniae (MP) pneumonia carefully, especially when unresponsiveness to macrolide is suspected.
• Serologic and molecular tests for MP infection and excluding respiratory infection caused by other pathogens might be considered.
• It is necessary to continuously monitor antibiotic susceptibility of MP, and efforts to lower antibiotic pressure are required.
Nutrition
Dietary intake and nutritional status of Korean children and adolescents: a review of national survey data
Minji Kang, So Yoon Choi, Minyoung Jung
Clin Exp Pediatr. 2021;64(9):443-458.   Published online December 28, 2020
In Korea, several national cross-sectional surveys monitor the diet, nutritional status, and health status of children. This continual dedicated national surveillance system contributes to the identification of nutritional and health issues, establishment of public health policies, and development of nutrition recommendations. This paper provides recent information about the Korea National Health and Nutrition Examination Survey and the Korean Youth Risk...
Critical Care Medicine
Pediatric postintensive care syndrome: high burden and a gap in evaluation tools for limited-resource settings
Chanapai Chaiyakulsil, Rapee Opasatian, Paweethida Tippayawong
Clin Exp Pediatr. 2021;64(9):436-442.   Published online December 18, 2020
Pediatric postintensive care syndrome has high impact and burden and can affect a child’s life for decades. The early evaluation and detection of such problems require a simple and less time-consuming surveillance tool. Current evaluation tools can be difficult and strenuous for areas with limited resources. Thus, a new simple tool is required for the early detection and intervention of postintensive care syndrome in critically ill children
Hematology
Thrombosis and severe acute respiratory syndrome coronavirus 2 vaccines: vaccine-induced immune thrombotic thrombocytopenia
Young Shil Park
Clin Exp Pediatr. 2021;64(8):400-405.   Published online June 30, 2021
· Thrombosis and thrombocytopenia occurring within 4–28 days after severe acute respiratory syndrome coronavirus 2 vaccination require attention.
· The terms vaccine-induced immune thrombotic thrombocytopenia (VITT) and thrombosis with thrombocytopenia syndrome (TTS) are used.
· VITT is pathogenetically similar to heparin-induced thrombocytopenia.
· VITT/TTS could be associated with the development of platelet-activating anti-platelet factor 4 antibodies.
· For suspected VITT/TTS, early treatment decisions (intravenous immunoglobulin, non-heparin anticoagulant, and avoidance of platelet transfusions) are important.
Allergy
Food allergies and food-induced anaphylaxis: role of cofactors
Meeyong shin
Clin Exp Pediatr. 2021;64(8):393-399.   Published online November 12, 2020
Question: What are the roles of cofactors in food allergies and food-induced anaphylaxis?
Finding: Cofactors reportedly play a role in approximately 14%–30% of anaphylactic reactions. Cofactors such as exercise, infection, nonsteroidal anti-inflammatory drugs, dehydration, and alcohol can increase intestinal permeability and antigen uptake, thereby causing allergic symptoms.
Meaning: Routine assessment of the possible involvement of cofactors is essential for the management of patients with food-induced anaphylaxis.
Neurology
Is it really a seizure? The challenge of paroxysmal nonepileptic events in young infants
Seung Yeon Jung, Joon Won Kang
Clin Exp Pediatr. 2021;64(8):384-392.   Published online September 18, 2020
Paroxysmal nonepileptic events (PNE) comprise of a variety of nonepileptic behaviors and are divided into various types. A more accurate diagnosis is possible by examining the video clip provided by the caregiver. In infants, physiologic PNE accounts for the majority of the PNE. It is important to exclude epilepsy, for which blood tests, electroencephalography, and imaging tests can facilitate differential...
Allergy
Prevalence, comorbidities, diagnosis, and treatment of nonallergic rhinitis: real-world comparison with allergic rhinitis
Hye Yung Yum, Eun Kyo Ha, Yoon Ho Shin, Man Yong Han
Clin Exp Pediatr. 2021;64(8):373-383.   Published online August 10, 2020
Rhinitis is among the most common respiratory diseases in children. Nonallergic rhinitis, which involves nasal symptoms without evidence of systemic allergic inflammation or infection, is a heterogeneous entity with diverse manifestations and intensities. Nonallergic rhinitis accounts for 16%–89% of the chronic rhinitis cases, affecting 1%–50% (median 10%) of the total pediatric population. The clinical course of nonallergic rhinitis is generally...
Infection
Updates on the coronavirus disease 2019 vaccine and consideration in children
Hyun Mi Kang, Eun Hwa Choi, Yae-Jean Kim
Clin Exp Pediatr. 2021;64(7):328-338.   Published online June 21, 2021
· The number of coronavirus disease 2019 cases has exponentially increased worldwide, and children ≤19 years old account for 11.0% of all confirmed cases.
· mRNA vaccines, BNT162b2 and mRNA-1273, and adenoviral vector vaccines, AZD1222 and Ad26.COV2.S, authorized for emergency use in the Emergency Use Listing of the World Health Organization are reviewed.
· Clinical trials of these vaccines have shown that they are safe and serious adverse reactions are rarely observed.
School closures during the coronavirus disease 2019 outbreak
Eun Young Cho, Young June Choe
Clin Exp Pediatr. 2021;64(7):322-327.   Published online May 31, 2021
· Earlier modeling studies of the effects of school closures on severe acute respiratory syndrome coronavirus 2 were largely derived from the pandemic influenza model, resulting in conflicting implications.
· Observational findings suggest no clear effect of school closures on community transmission or overall mortality.
· School closures must be weighed against potential high social costs, which can also negatively affect children’s health.
Neonatology (Perinatology)
Neurodevelopmental outcomes of very low birth weight infants in the Neonatal Research Network of Japan: importance of neonatal intensive care unit graduate follow-up
Yumi Kono; on behalf of the Neonatal Research Network of Japan
Clin Exp Pediatr. 2021;64(7):313-321.   Published online November 9, 2020
· Very low birth weight infants remain at high risk of developing neurodevelopmental impairments in early childhood.
· It is important to establish a network follow-up protocol and complete assessments with fewer dropouts to enable clarification of the outcomes of registered infants.
· All possible strategies should be employed to maintain good compliance after neonatal intensive care unit discharge.
Cardiology
Application of CRISPR-Cas9 gene editing for congenital heart disease
Heeyoung Seok, Rui Deng, Douglas B. Cowan, Da-Zhi Wang
Clin Exp Pediatr. 2021;64(6):269-279.   Published online March 2, 2021
Clustered regularly interspaced short palindromic repeats and CRISPR-associated protein 9 (CRISPR-Cas9) system has made a big step in the genome editing which still requires technical developments for the efficient applications in the many fields including congenital heart diseases (CHDs), closely related to the genomic abnormality. In this review, we tried to cover the most updated researches of CRISPR-Cas9 in the CHDs to understand the current technologies, eventually becoming therapeutic bases for the CHD patients.
Gastroenterology
Causes of acute gastroenteritis in Korean children between 2004 and 2019
Eell Ryoo
Clin Exp Pediatr. 2021;64(6):260-268.   Published online September 18, 2020
· Norovirus is the most common virus in Korean children with acute gastroenteritis.
· Escherichia coli and Salmonella spp. are the most common cause of bacterial gastroenteritis in Korean children, with a detection rate of 3%–20%.
· Uncommon bacterial and parasitic gastroenteritis require attention because of increasing international exchange and overseas travel.
Neurology
Myths and truths about pediatric psychogenic nonepileptic seizures
Jung Sook Yeom, Heather Bernard, Sookyong Koh
Clin Exp Pediatr. 2021;64(6):251-259.   Published online October 17, 2020
• Psychogenic non-epileptic seizures (PNES) are events that look like epileptic seizures but are not caused by abnormal electrical discharges.
• PNES are a manifestation of psychological and emotional distress.
• Treatment for PNES does not begin with the psychological intervention but starts with the diagnosis and how the diagnosis is delivered.
• A multifactorial biopsychosocial process and a neurobiological review are both essential components when treating PNES
Genetics and Metabolism
Understanding the genetics of systemic lupus erythematosus using Bayesian statistics and gene network analysis
Seoung Wan Nam, Kwang Seob Lee, Jae Won Yang, Younhee Ko, Michael Eisenhut, Keum Hwa Lee, Jae Il Shin, Andreas Kronbichler
Clin Exp Pediatr. 2021;64(5):208-222.   Published online July 15, 2020
Bayesian false-discovery probability and false-positive report probability are the 2 major Bayesian methods used to evaluate noteworthiness of a genetic variant.
Application of stricter P value is needed to confirm statistical significance in meta-analyses.
Gene network analysis of noteworthy genetic variants shows a blueprint of the genetic background in complex diseases.
Adolescence Medicine
The impacts of exercise on pediatric obesity
Ronald J. Headid III, Song-Young Park
Clin Exp Pediatr. 2021;64(5):196-207.   Published online August 4, 2020
Pediatric obesity contributes to the development of vascular dysfunction and metabolic and cardiovascular diseases which have all been shown to track into adulthood, increasing the risk of early mortality. Early exercise intervention is critical for combating obesity-related comorbidities and the optimal exercise prescription has yet to be well documented. Exercise prescriptions to combat pediatric obesity should incorporate both aerobic and muscle-strengthening exercises with an emphasis on long-term adherence.
Critical Care Medicine
The use of extracorporeal membrane oxygenation in children with acute fulminant myocarditis
Silver Heinsar, Sainath Raman, Jacky Y. Suen, Hwa Jin Cho, John F. Fraser
Clin Exp Pediatr. 2021;64(5):188-195.   Published online August 10, 2020
Acute fulminant myocarditis (AFM) occurs as an inflammatory response to an initial myocardial insult. Its rapid and deadly progression calls for prompt diagnosis with aggressive treatment measures. The demonstration of its excellent recovery potential has led to increasing use of mechanical circulatory support, especially extracorporeal membrane oxygenation (ECMO). Arrhythmias, organ failure, elevated cardiac biomarkers, and decreased ventricular function at presentation...
Neonatology (Perinatology)
Clinical implications of coronavirus disease 2019 in neonates
Do-Hyun Kim
Clin Exp Pediatr. 2021;64(4):157-164.   Published online February 4, 2021
• Severe acute respiratory syndrome coronavirus 2 (SARSCoV-2) was detected in approximately 3% of neonates of mothers with coronavirus disease 2019 (COVID-19).
• Neonatal COVID-19 is relatively benign with 16%–22.4% cases asymptomatic.
• Neonates with pre-existing medical conditions and preterm infants are at a higher risk of severe COVID-19.
• Requirement for neonatal mechanical ventilation is 20%–22.4% (vs. 4% in children)
• Low birth weight (13.9%) and premature birth (22.2%) affect neonates of mothers with COVID-19.
Genetics and Metabolism
Neurofibromatosis type I: points to be considered by general pediatricians
Eungu Kang, Hee Mang Yoon, Beom Hee Lee
Clin Exp Pediatr. 2021;64(4):149-156.   Published online July 15, 2020
Neurofibromatosis type 1 (NF1), a prevalent genetic disease that is transmitted in an autosomal dominant manner, is characterized by multiple cutaneous café-au-lait spots and neurofibromas as well as various degrees of neurological, skeletal, and neoplastic manifestations. The clinical features of NF1 increase in frequency with age, while the clinical diagnosis can remain undetermined in some pediatric patients. Importantly, affected patients...
Review article
Immunology
Systematic review of literature and analysis of big data from the National Health Insurance System on primary immunodeficiencies in Korea
Sohee Son, Ji-Man Kang, Younsoo Hahn, Kangmo Ahn, Yae-Jean Kim
Clin Exp Pediatr. 2021;64(4):141-148.   Published online July 13, 2020
In this article, a systematic review of reported primary immunodeficiency disease (PID) cases in Korea was performed and we attempted to estimate the number of PID patients and healthcare costs for the first time in Korea. Our review revealed that Korean PID cases are greatly underreported in the literature based on health insurance. Physicians in the field and health care policymakers should be aware of the disease burden of PID.
Review Article
Other
Behavioral insomnia in infants and young children
Eun Kyeong Kang, Seung Soo Kim
Clin Exp Pediatr. 2021;64(3):111-116.   Published online July 15, 2020
• Behavioral insomnia is common and affects a child’s daytime functioning and emotions.
• Diagnosing insomnia using the child’s sleep history, a sleep diary/log, and sleep questionnaires is important.
• Behavioral intervention, the main treatment, involves creating positive associations with sleep, establishing a consistent sleep schedule and bedtime routines, and the development of selfsoothing skills.
Neurology
Myelin oligodendrocyte glycoprotein antibody-associated disorders: clinical spectrum, diagnostic evaluation, and treatment options
Yun-Jin Lee, Sang Ook Nam, Ara Ko, JuHyun Kong, Shin Yun Byun
Clin Exp Pediatr. 2021;64(3):103-110.   Published online May 14, 2020
MOG antibody-associated disorder exhibits different pathophysiological and phenotypic findings than both aquaporin-4 antibody-associated neuromyelitis optica spectrum disorder and typical MS. MOG-antibody is of particular interest in pediatric patients with clinical or radiological non-MS typical findings. MOG-antibody was included in a diagnostic algorithm for children recommending for the first time a standardized use in clinical practice except in cases of typical MS.
General Pediatrics
Association between maternal smoking during pregnancy and risk of bone fractures in offspring: a systematic review and meta-analysis
Erfan Ayubi, Saeid Safiri, Kamyar Mansori
Clin Exp Pediatr. 2021;64(3):96-102.   Published online February 5, 2020
Question: What is the effect of maternal smoking during pregnancy (MSDP) on the risk of bone fractures in the offspring?
Finding: After the adjustment for misclassification, MSDP may be associated with a 27% increased risk of bone fracture in the offspring (pooled odds ratio, 1.27; 95% confidence interval, 1.00–1.62; I2=0%; P=0.537)
Meaning: Preventive measures and health education programs should be designed and implemented to encourage women to stop smoking, especially during.
Clinical features, diagnosis, and outcomes of multisystem inflammatory syndrome in children associated with coronavirus disease 2019
Ji Hee Kwak, Soo-Young Lee, Jong-Woon Choi; the Korean Society of Kawasaki Disease
Clin Exp Pediatr. 2021;64(2):68-75.   Published online December 30, 2020
Hundreds of cases of children and adolescents with hyperinflammatory responses such as Kawasaki disease have been reported amid the coronavirus disease 2019 (COVID-19) pandemic, leading to coining of the new term COVID-19–associated multisystem inflammatory syndrome in children. In this review article, we introduce the illness and describe its case definitions, epidemiology, pathogenesis, clinical features, treatments, and outcomes.
Allergy
Eosinophils and childhood asthma
Bong Seok Choi
Clin Exp Pediatr. 2021;64(2):60-67.   Published online January 6, 2021
•In allergic eosinophilic asthma, eosinophils act as important effector cells and antigen-presenting cells, while in nonallergic eosinophilic asthma, type 2 innate lymphoid cells play an important role in eosinophil activation.
•Sputum eosinophil counts can be helpful for evaluating allergic airway inflammation in asthma.
• Anti-interleukin-5 has broadened the scope of asthma treatment.
Cardiology
Pediatric heart transplantation: how to manage problems affecting long-term outcomes?
Young Hwue Kim
Clin Exp Pediatr. 2021;64(2):49-59.   Published online April 8, 2020
Since the initial International Society of Heart Lung Transplantation registry was published in 1982, the number of pediatric heart transplantations has increased markedly, reaching a steady state of 500–550 transplantation annually and occupying up to 10% of total heart transplantations. Heart transplantation is considered an established therapeutic option for patients with end-stage heart disease. The long-term outcomes of pediatric heart...
Gastroenterology
Changing prevalence of Helicobacter pylori infection in children and adolescents
Ji Sook Park, Jin Su Jun, Ji-Hyun Seo, Hee-Shang Youn, Kwang-Ho Rhee
Clin Exp Pediatr. 2021;64(1):21-25.   Published online July 15, 2020
Although Helicobacter pylori infection rate in children is unclear due to diversity and limitation of diagnostic tests unlike in adults, investigation the childhood prevalence is important for predicting H. pylori-related diseases in the future.
H. pylori infection occurred in early childhood, and declined during 30 years in our study.
Change in risk factors of H. pylori transmission and consensus for eradication therapy in children might further reduce the infection rate.
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