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Review Article
Nephrology (Genitourinary)
Blood pressure measurements and hypertension in infants, children, and adolescents: from the postmercury to mobile devices
Seon Hee Lim, Seong Heon Kim
Clin Exp Pediatr. 2022;65(2):73-80.   Published online September 15, 2021
· Hypertension is defined as a blood pressure (BP) >90th (elevated) or 95th (hypertension) percentile in children by height, age, and sex and >95th percentile in neonates by age, birth weight, and sex.
· Although the oscillometric method can be used for screenings, the auscultatory method remains the gold standard. The hybrid method employs the auscultatory and electronic methods and can reduce bias.
· BP measurement mobile device applications have a potential for development.
General Pediatrics
A new perspective on cholesterol in pediatric health: association of vitamin D metabolism, respiratory diseases, and mental health problems
Jeana Hong
Clin Exp Pediatr. 2022;65(2):65-72.   Published online December 9, 2021
∙ Pediatric dyslipidemia is associated with several health problems besides cardiovascular diseases.
∙ There is a direct association between pediatric dyslipidemia and low serum vitamin D levels, asthma, and mental health problems regardless of body mass index.
∙ More large-scale nationally representative studies are needed to establish the appropriate cutoff points for the definition of dyslipidemia that is a prerequisite for further epidemiological studies in the Korean pediatric population.
Neurology
Promising candidate cerebrospinal fluid biomarkers of seizure disorder, infection, inflammation, tumor, and traumatic brain injury in pediatric patients
Seh Hyun Kim, Soo Ahn Chae
Clin Exp Pediatr. 2022;65(2):56-64.   Published online August 23, 2021
· Pediatric cerebrospinal fluid (CSF) components have been extensively evaluated as biomarkers of various neurologic diseases.
· Several promising candidate CSF biomarkers, including Tau, glial fibrillary acidic protein, neuron-specific enolase, S100β, and interleukins, have been studied in pediatric patients with seizure disorders, central nervous system infections, inflammation, tumors, hypoxic-ischemic encephalopathy, traumatic brain injuries, intraventricular hemorrhage, and congenital hydrocephalus.
· Circulating microRNAs in the CSF are a promising class of biomarkers for various neurological diseases.
Gastroenterology
Upper gastrointestinal tract involvement of Crohn disease: clinical implications in children and adolescents
Eun Sil Kim, Mi Jin Kim
Clin Exp Pediatr. 2022;65(1):21-28.   Published online September 10, 2021
· Clinical manifestations of upper gastrointestinal (UGI) tract involvement in Crohn's disease (CD) are common but often clinically underestimated.
· Diagnosing CD by confirming inflammation of the UGI tract histologically is challenging because macroscopic and microscopic findings overlap with those of other diseases.
· Ongoing efforts are needed to enable a standardized assessment of UGI CD in the future.
Neurology
Worldwide national intervention of developmental screening programs in infant and early childhood
Seunghyo Kim
Clin Exp Pediatr. 2022;65(1):10-20.   Published online September 30, 2021
∙ Prevalence rate of developmental disabilities has been reported from 8% to 15% and its rate is increasing worldwide.
∙ The critical period of intervention for developmental delay is before the child reaches 3 years of age.
∙ All primary care pediatricians should conduct developmental surveillance and screening tests to infants and children at scheduled visits. Through this, they are liable for providing early identification and timely intervention.
Neonatology (Perinatology)
Growth patterns of preterm infants in Korea
Joohee Lim, So Jin Yoon, Soon Min Lee
Clin Exp Pediatr. 2022;65(1):1-9.   Published online July 8, 2021
∙ The growth of preterm infants is a main focus of neonatology.
∙ Preterm infants in Korea, especially those with a very low birth weight, achieve retarded growth.
∙ Careful growth monitoring and early intervention will contribute to better development outcomes and quality of life for preterm infants and improve public health.
Endocrinology
Endocrine comorbidities of pediatric obesity
Jieun Lee, Jae Hyun Kim
Clin Exp Pediatr. 2021;64(12):619-627.   Published online August 26, 2021
∙ Pediatric obesity can involve endocrine comorbidities such as prediabetes, type 2 diabetes, dyslipidemia, metabolic syndrome, polycystic ovary syndrome, and central precocious puberty.
∙ Prediabetes and type 2 diabetes in youth aged 10–19 years had a prevalence of 25.9% and 0.6% in 2013–2014, respectively.
∙ Dyslipidemia in Korean adolescents aged 10–18 years had a prevalence of 7.64% (total cholesterol ≥200 mg/dL), 6.09% (low-density lipoprotein cholesterol ≥130 mg/dL), 8.69% (triglyceride ≥150 mg/dL), and 12.52% (high-density lipoprotein cholesterol ≤40 mg/dL) in 2007–2018.
∙ Metabolic syndrome in Korean youth has a prevalence of 1.9%–14.7% in males and 1.7%–12.6% in females with wide variation in definitions.
∙ Appropriate comorbidity screening and management and/or specialist referral are necessary for obese children and adolescents.
Neurology
Cognitive outcomes in late childhood and adolescence of neonatal hypoxic-ischemic encephalopathy
Bo Lyun Lee, Hannah C. Glass
Clin Exp Pediatr. 2021;64(12):608-618.   Published online May 24, 2021
∙ Cognitive impairments occur in children with hypoxic-ischemic encephalopathy (HIE) even without neuromotor deficits.
∙ Therapeutic hypothermia has improved neurodevelopmental outcomes of children with HIE; however, 40% of children remain at risk of death/disability or cognitive impairments necessitating the development of adjunctive neuroprotective therapies.
∙ Long-term follow-up until adolescence is required to identify cognitive dysfunction.
∙ A pattern of watershed injury on brain imaging is associated with poor cognitive outcomes.
Infection
Recommendation for use of diphtheria and tetanus toxoids and acellular pertussis, inactivated poliovirus, Haemophilus influenzae type b conjugate, and hepatitis B vaccine in infants
Hye-Kyung Cho, Su Eun Park, Yae-Jean Kim, Dae Sun Jo, Yun-Kyung Kim, Byung-Wook Eun, Taek-Jin Lee, Jina Lee, Hyunju Lee, Ki Hwan Kim, Eun Young Cho, Jong Gyun Ahn, Eun Hwa Choi; The Committee on Infectious Diseases of the Korean Pediatric Society
Clin Exp Pediatr. 2021;64(12):602-607.   Published online June 8, 2021
∙ Diphtheria and tetanus toxoids and acellular pertussis-inactivated poliovirus-Haemophilus influenzae type b-hepatitis B (DTaP-IPV-Hib-HepB) was licensed in Korea in April 2020.
∙ DTaP-IPV-Hib-HepB is indicated as a 3-dose primary series for infants aged 2, 4, and 6 months who received the standalone HepB vaccine at birth.
∙ Infants born to HepB surface antigen-positive mothers are currently recommended to be immunized with HepB immunoglobulin at birth and then monovalent HepB vaccine at 0, 1, and 6 months.
Oncology
Update on infantile hemangioma
Hye Lim Jung
Clin Exp Pediatr. 2021;64(11):559-572.   Published online May 26, 2021
· Infantile hemangiomas (IHs) are the most common benign vascular tumors, occurring in 5%–10% of infants.
· IHs are characteristically not present at birth but are usually diagnosed at 1–4 weeks of age, rapidly proliferate until 5 months of age, and then spontaneously involute.
· High-risk IHs (10%) require early treatment from 1 month of age.
· Oral propranolol, a nonselective beta-blocker, is the first-line treatment for IHs.
Nutrition
Changes in health status of North Korean children and emerging health challenges of North Korean refugee children
Seong-Woo Choi
Clin Exp Pediatr. 2021;64(11):552-558.   Published online May 17, 2021
· Among North Korean refugee (NKR) children under 5 years, 61% and 9.3% were underweight in 1998 and 2017, respectively.
· The immunization rate of NKR children exceeded 90% since 2006.
· For NKR children, protein-energy malnutrition was the #1 cause of death in 2009 versus #17 in 2019.
· In 2020, stunting affected 5.4% and 0.9% and obesity affected 10.7% and 2.7% of NKR versus South Korean children, respectively.
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.
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