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Noma-like necrotizing stomatitis in a child with Crohn`s disease
( Yejin Lee ),( Ik Jun Moon ),( Woo Jin Lee ),( Chong Hyun Won ),( Sung Eun Chang ),( Mi Woo Lee ),( Jee Ho Choi ),( Ki Chan Moon ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1
Noma is known to be an opportunistic infection characterized by a devastating gangrenous stomatitis leading to severe tissue destruction. It is associated with high mortality and grotesque disfigurement of the affected area, usually the lips. According to the literature, noma predominantly affects malnourished children in sub-Saharan Africa. Only few cases have been reported in immune compromised patients from developed countries. We present an unusual case of noma-like necrotizing stomatitis in a previously healthy child with Crohn’s disease in Korea. A 11 year-old girl with rapidly progressive necrotic stomatitis of the lower lip was first diagnosed as pyoderma gangrenosum accompanying Crohn’s disease. Steroid pulse therapy was administered to control disease activity which unexpectedly resulted in aggravation of the lesion. Eventually the diagnosis of noma-like necrotizing stomatitis was made. After cessation of systemic steroid and administration broad spectrum antibiotics with intravenous immunoglobulin, the disease slowly improved over a month. However, as the fibrous tissue replaced the whole lips, the patient was left with speech impairment due to buccal stricture and disfigurement. We report this case to increase clinicians’ awareness of the disease and to stress the importance of early recognition and management of this rare disease in order to minimize sequelae.
Moon, Jungmi,Ha, Yejin,Kim, Misun,Sim, Jeongeun,Lee, Youngmi,Suh, Minah American Chemical Society 2016 ANALYTICAL CHEMISTRY - Vol.88 No.18
<P>In this work, we developed a dual amperometric/potentiometric microsensor for sensing nitric oxide (NO) and potassium ion (K+). The dual NO/K+ sensor was prepared :based on a dual recessed electrode possessing Pt (diameter, 50 mu m) and Ag (diameter, 76.2 mu m) microdisks. The Pt disk surface (WE1) was modified with electroplatinization and the following coating with fluorinated xerogel; and the Ag disk surface (WE2) was oxidized to AgCl on which K+ ion selective membrane was loaded-subsequent to the silanization. WE1 and WE2 of a dual microsensor were used for amperometric sensing of NO (106 +/- 28 pA mu M(-1)n = 10, at +0.85 V applied vs Ag/AgCl) and for potentiometric sensing of K+ (51.6 +/- 1.9 mV pK(-1), n = 10), respectively, with high sensitivity. In addition, the sensor showed good selectivity over common biological interferents, sufficiently fast response time and relevant stability (within 6 h in vivo experiment). The sensor had a small dimension (end plane diameter, 428 +/- 97 mu m, n = 20) and needle-like sharp geometry which allowed the sensor to be inserted in biological tissues. Taking advantage of this insertability, the sensor was applied for the simultaneous monitoring of NO and K+ changes in a living rat brain cortex at a depth of 1.19 +/- 0.039 mm and near the spontaneous epileptic seizure focus. The seizures were induced with 4-aminopyridine injection onto the rat brain cortex. NO and K+ levels were dynamically changed in clear correlation with the electrophysiological recording of seizures. This indicates that the dual NO/K+ sensor's measurements well reflect membrane potential changes of neurons and associated cellular components of neurovascular coupling. The newly developed NO/K+ dual microsensor showed the feasibility of real-time fast monitoring of dynamic changes of closely linked NO and K+ in vivo.</P>
( Yejin Kwon ),( Hanna Moon ),( Yeonseong Jeong ),( Young-han Kim ) 대한주산의학회 2022 Perinatology Vol.33 No.2
An incarcerated gravid uterus is a rare obstetrical complication that requires close monitoring to ensure fetal and maternal well-being and to plan a successful delivery. Most patients present with vague anatomic pressure-related symptoms, such as pelvic discomfort and urinary symptoms, in the early 2nd trimester. Initial presentation in the 3rd trimester is scarce, and asymptomatic cases are even rarer. In this case report, we present an asymptomatic patient who was referred at 30 weeks of gestation with an initial impression of placenta previa totalis. She was not a candidate for uterine reduction; therefore, after a close follow-up period, she underwent planned cesarean section at 36 weeks of gestation. Because of its rare frequency and related obstetrical complications, early clinical suspicion and diagnosis are critical for management until delivery and establishing a successful delivery strategy.
Kim Yejin,Kim Yoo-min,Kim Doo Ri,Kim Han Gyeol,Sung Ji-Hee,Choi Suk-Joo,Oh Soo-young,Kim Yae-Jean,Chang Yun Sil,Kim Dongsub,Kim Jung-Sun,Moon Il Joon,Roh Cheong-Rae 대한의학회 2023 Journal of Korean medical science Vol.38 No.32
Background: The aim of this study was to capture multifaceted clinical characteristics of congenital cytomegalovirus (CMV) infection from diagnosis to treatment using a multidisciplinary approach including obstetrics, pediatrics, pathology, and otorhinolaryngology-head and neck surgery. Methods: This is a retrospective study including 30 consecutive cases of congenital CMV infection that were diagnosed at a single tertiary hospital located in Seoul, Korea from January 2009 to December 2020. Congenital CMV infection was defined as a positive result by polymerase chain reaction from urine, saliva or cerebrospinal fluid or positive CMV IgM from neonatal blood sampled within 3 weeks after birth. All cases were analyzed with respect to whole clinical characteristics from diagnosis to treatment of congenital CMV by a multidisciplinary approach including prenatal sonographic findings, maternal immune status regarding CMV infection, detailed placental pathology, neonatal clinical manifestation, auditory brainstem response test, and antiviral treatment (ganciclovir or valganciclovir). Long-term outcomes including developmental delay and hearing loss were also investigated. Results: The total number of births during the study period in our institution was 19,385, with the prevalence of congenital infection estimated to be 0.15%. Among 30 cases of congenital CMV, the median gestational age at delivery was 32.2 weeks [range, 22.6–40.0] and 66.7% of these infants were delivered preterm at less than 37 weeks. Suspected fetal growth restriction was the most common prenatal ultrasound finding (50%) followed by ventriculomegaly (17.9%) and abnormal placenta (17.9%), defined as thick placenta with calcification. No abnormal findings on ultrasound examination were observed in one-third of births. Maternal CMV serology tests were conducted in only 8 cases, and one case each of positive and equivocal IgM were found. The most common placental pathologic findings were chronic villitis (66.7%) and calcification (63.0%), whereas viral inclusions were identified in only 22.2%. The most common neonatal manifestations were jaundice (58.6%) followed by elevation of aspartate aminotransferase (55.2%) and thrombocytopenia (51.7%). After excluding cases for which long-term outcomes were unavailable due to death (n = 4) or subsequent follow up loss (n = 3), developmental delay was confirmed in 43.5% of infants (10/23), and hearing loss was confirmed in 42.9% (9/21) during the follow-up period. In our cohort, 56.7% (17/30) of neonates were treated for congenital CMV with ganciclovir or valganciclovir. Conclusion: Our data show that prenatal findings including maternal serologic tests and ultrasound have limited ability to detect congenital CMV in Korea. Given that CMV is associated with high rates of developmental delay and hearing loss in infants, there is an urgent need to develop specific strategies for the definite diagnosis of congenital CMV infection during the perinatal period by a multidisciplinary approach to decrease the risks of neurologic impairment and hearing loss through early antiviral treatment.
Long-range Coulomb interaction in nodal-ring semimetals
Huh, Yejin,Moon, Eun-Gook,Kim, Yong Baek American Physical Society 2016 Physical Review B Vol.93 No.3
<P>Recently there have been several proposals of materials predicted to be nodal-ring semimetals, where zero energy excitations are characterized by a nodal ring in the momentum space. This class of materials falls between the Dirac-like semimetals and the more conventional Fermi-surface systems. As a step towards understanding this unconventional system, we explore the effects of the long-range Coulomb interaction. Due to the vanishing density of states at the Fermi level, Coulomb interaction is only partially screened and remains long-ranged. Through renormalization group and large-Nf computations, we have identified a nontrivial interacting fixed point. The screened Coulomb interaction at the interacting fixed point is an irrelevant perturbation, allowing controlled perturbative evaluations of physical properties of quasiparticles. We discuss unique experimental consequences of such quasiparticles: acoustic wave propagation, anisotropic dc conductivity, and renormalized phonon dispersion as well as energy dependence of quasiparticle lifetime.</P>
이예진(Yejin Lee),장지연(Jiyeon Jang),서예준(Yejune Seo),조정현(Junghyun Cho),문인열(Inyeol Moon),김준범(Junbeom Kim),강승택(Sungtek Kahng) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
최근 저궤도 위성 통신망 구축에 대한 개발이 빠르게 이루어 지고 있다. 본 논문에서는 이러한 기술 동향을 바탕으로 저궤도 위성 통신에 적합한 고이득 평면형 안테나를 제안하고자 한다. 설계한 반사판 안테나는 패치 형태로 구성되어 있으며, 패치의 크기 변화를 통하여 요구되는 반사판 안테나를 설계하였다. 설계와 검증은 상용 전자기 시뮬레이션 (CST-MWS)를 통해 확인하였다.
일회성 중강도 유산소 운동이 젊은 성인의 대뇌 혈류량과 인지기능에 미치는 영향: 트레드밀 vs. 고정식 에르고미터
강예진 ( Yejin Kang ),이루다 ( Ruda Lee ),황문현 ( Moon-hyon Hwang ),임명주 ( Myong-joo Lim ) 한국운동생리학회(구 한국운동과학회) 2020 운동과학 Vol.29 No.2
PURPOSE: This study aimed to compare the acute effects of different types (treadmill vs. cycle) of moderate-intensity aerobic exercise on cerebral blood flow and cognitive function in young adults. METHODS: By a randomized crossover study design, ten participants were initially assigned to either treadmill exercise (TE; n=5) or cycle ergometer exercise (CE; n=5) and then they performed the other with seven-day wash-out period. Both exercises were implemented at the target heart rate corresponding to 70% of heart rate reserve for 30 minutes. Cognitive function was assessed by the Stroop Color-Word test at pre- and post-exercise. Cerebral blood flow was continuously monitored using near-infrared spectroscopy technique during rest, cognitive function test (CFT), and exercise. RESULTS: There was a significant group by time interaction in tissue saturation index (TSI) (p=.046). Post-hoc analysis presented that TSI at post-exercise CFT was higher than during exercise in TE (p=.02). In both exercises, TSI at pre-exercise CFT significantly increased compared to the resting value (p=.001). Cerebral oxyhemoglobin level was significantly increased during exercise and at post-exercise CFT compared to the resting value in both exercises (p<.001). The reaction time for certain cognitive tasks such as color, word with matched color, word with color interference, and color with word interference was improved after both exercises (p<.05). CONCLUSIONS: One-bout of moderate-intensity aerobic exercise acutely improves cerebral blood flow and cognitive function even in healthy young adults. Exercise types with the same intensity do not seem to make meaningful difference in the positive effects of aerobic exercise.