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Jiwon Choi(Jiwon Choi),Keesin Jeong(Keesin Jeong),Haiyoung Jung(Haiyoung Jung) 한국화재소방학회 2022 International Journal of Fire Science and Engineer Vol.36 No.4
Dust and fine dust exist in various forms and can lead to various problems such as dust explosion and air pollution. To reduce them, recently, research on electrospray electric precipitation, among various dust collection methods, has been actively conducted. In this study, comparative analysis experiments were performed on microdroplet generation characteristics for direct and indirect charging methods of electrospray electric precipitation. A visualization device was fabricated to generate microdroplets, and microdroplets were photographed with a high-magnification camera according to each charging method. The size and number of microdroplets were then analyzed via ImageJ software.
Optimal anesthesia protocols for successful intraoperative neuromonitoring during thyroid surgery
Jiwon Lee(Jiwon Lee),Jung-Man Lee(Jung-Man Lee),Young Jun Chai(Young Jun Chai) 대한신경모니터링학회 2022 Journal of Neuromonitoring & Neurophysiology Vol.2 No.2
There are several factors related to anesthesia that are required for successful intraoperative neuromonitoring (IONM) during thyroid and parathyroid surgery, including proper placement of endotracheal tube, adequate neuromuscular blockade, use of appropriate neuromuscular blockade reversal agent, and pain management. In this review, we summarize the anesthesia issues related to IONM during thyroid and parathyroid surgery.
Jiwon Jung,Young-Ju Lim,Eun Ok Kim,Sung-Han Kim 대한의학회 2022 Journal of Korean medical science Vol.37 No.2
Background: Preventive measures are needed to reduce the risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection among healthcare workers (HCWs). Notably, hospital staff are usually exposed when they are unmasked. There are limited data on the risk of transmission during mealtimes at hospital staff cafeterias. We aimed to evaluate the risk of transmission in cafeterias. Methods: From January 2020 through September 2021, we analyzed the risk of SARS-CoV-2 transmission through closed-circuit television and radio-frequency identification tracking and follow-up testing when 33 HCWs, who were eventually diagnosed as coronavirus disease 2019 (COVID-19), ate in staff cafeterias during the infectious period. The seats were arranged so the HCWs would sit on either side without facing each other. There were no plastic barriers installed, and HCWs were encouraged not to talk during meals. Results: Three of the 119 individuals who ate at seats next (about 30 cm) to index during the period of transmission and underwent follow-up SARS-CoV-2 polymerase chain reaction tests were diagnosed with COVID-19 (2.5%; 95% confidence interval, 0.5–7.4%). Among the 98 HCWs who were investigated about talking during meals, there was a higher attack rate among those who spoke with each other than among those who did not (12.5% [3/24] vs. 0% [0/74], P = 0.013). Conclusion: The risk of transmission in a hospital’s employee cafeterias is not high with sideby-side seating, especially in the absence of conversation.
Jiwon Jung,Eun Ok Kim,김성한 대한의학회 2020 Journal of Korean medical science Vol.35 No.44
Between August 31st and September 4th 2020 in a tertiary care hospital in Seoul, the fever detection rate by infrared thermoscanning camera at the gates was 0.002% (95% confidence interval [CI], 0.001%–0.006%) and that by manual fever check at the outpatient clinics was 0.02% (95% CI, 0.01%–0.03%) (P < 0.001). The difference strongly suggests that sensitivity of the thermoscanning camera in the market must be upgraded.
Incidence and Risk Factors of Ocular Infection Caused by <i>Staphylococcus aureus</i> Bacteremia
Jung, Jiwon,Lee, Junyeop,Yu, Shi Nae,Kim, Yong Kyun,Lee, Ju Young,Sung, Heungsup,Kim, Mi-Na,Kim, Sung-Han,Lee, Sang-Oh,Choi, Sang-Ho,Woo, Jun Hee,Lee, Joo Yong,Kim, Yang Soo,Chong, Yong Pil American Society for Microbiology 2016 Antimicrobial Agents and Chemotherapy Vol.60 No.4
<P>Staphylococcus aureus bacteremia (SAB) often leads to ocular infections, including endophthalmitis and chorioretinitis. However, the incidence, risk factors, and outcomes of ocular infections complicated by SAB are largely unknown. We retrospectively analyzed the incidence and risk factors of ocular involvement in a prospective cohort of patients with SAB at a tertiary-care hospital. Ophthalmologists reviewed the fundoscopic findings and classified the ocular infections as endophthalmitis or chorioretinitis. During the 5-year study period, 1,109 patients had SAB, and data for 612 (55%) who underwent ophthalmic examinations within 14 days after SAB onset were analyzed. Of those 612 patients, 56 (9% [95% confidence interval [CI], 7 to 12%]) had ocular involvement, including 15 (2.5%) with endophthalmitis and 41 (6.7%) with chorioretinitis. In a multivariate analysis, infective endocarditis (adjusted odds ratio [aOR], 5.74 [95% CI, 2.25 to 14.64]) and metastatic infection (aOR, 2.38 [95% CI, 1.29 to 4.39]) were independent risk factors for ocular involvement. Of the 47 patients with ocular involvement who could communicate, only 17 (36%) had visual disturbances. Two-thirds of the patients with endophthalmitis (10/15 patients) were treated with intravitreal antibiotics combined with parenteral antibiotics, whereas all of the patients with chorioretinitis were treated only with systemic antibiotics. No patients became blind. Among 42 patients for whom follow-up assessments were available, the ocular lesions improved in 29 (69%) but remained the same in the others. Ocular involvement was independently associated with death within 30 days after SAB onset. Ocular involvement is not uncommon among patients with SAB. Routine ophthalmic examinations should be considered for patients with infective endocarditis or metastatic infections caused by SAB.</P>
Elucidation of Bacterial Pneumonia-Causing Pathogens in Patients with Respiratory Viral Infection
Jung, Hwa Sik,Kang, Byung Ju,Ra, Seung Won,Seo, Kwang Won,Jegal, Yangjin,Jun, Jae-Bum,Jung, Jiwon,Jeong, Joseph,Jeon, Hee-Jeong,Ahn, Jae-Sung,Lee, Taehoon,Ahn, Jong Joon The Korean Academy of Tuberculosis and Respiratory 2017 Tuberculosis and Respiratory Diseases Vol.80 No.4
Background: Bacterial pneumonia occurring after respiratory viral infection is common. However, the predominant bacterial species causing pneumonia secondary to respiratory viral infections other than influenza remain unknown. The purpose of this study was to know whether the pathogens causing post-viral bacterial pneumonia vary according to the type of respiratory virus. Methods: Study subjects were 5,298 patients, who underwent multiplex real-time polymerase chain reaction for simultaneous detection of respiratory viruses, among who visited the emergency department or outpatient clinic with respiratory symptoms at Ulsan University Hospital between April 2013 and March 2016. The patients' medical records were retrospectively reviewed. Results: A total of 251 clinically significant bacteria were identified in 233 patients with post-viral bacterial pneumonia. Mycoplasma pneumoniae was the most frequent bacterium in patients aged <16 years, regardless of the preceding virus type (p=0.630). In patients aged ${\geq}16years$, the isolated bacteria varied according to the preceding virus type. The major results were as follows (p<0.001): pneumonia in patients with influenza virus (type A/B), rhinovirus, and human metapneumovirus infections was caused by similar bacteria, and the findings indicated that Staphylococcus aureus pneumonia was very common in these patients. In contrast, coronavirus, parainfluenza virus, and respiratory syncytial virus infections were associated with pneumonia caused by gram-negative bacteria. Conclusion: The pathogens causing post-viral bacterial pneumonia vary according to the type of preceding respiratory virus. This information could help in selecting empirical antibiotics in patients with post-viral pneumonia.
Jiwon Kim,Chuleui Jung 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
Community analysis of oribatid mites was conducted in unburned and burned area of Samcheok-si, Gangwon province with differential burn severity that occurred in April 2000. Except control site, four sites (T1, T2, T3 and C2) were selected according to burn severity and subsequent recovery following a year after fire form T1 (heavily burned) to Control (unburned). This study analyzes the abundance, species richness, diversity and evenness, similarity, dominant species, and MGP types of oribatid mites. Oribatid mites were sampled 8times from each site from 2005 to 2007. Total of 40 families, 58 genus, 123 species and 4,638 individuals were founded. Species richness and abundance of oribatid mites decreased as burn severity increased. Diversity index of control site was higher than all other sites and decreased as the burn severity increased. Similarity between control and C2 sites was highest among the sites and cluster analysis showed control and C2 as closely related followed by T3, T2 and T1 respectively. MGP-I analysis revealed oribatid mites of all sites as GP type. MGP-II analysis showed control as G type and all other sites as GP type.
Nosocomial Outbreak by Delta Variant From a Fully Vaccinated Patient
Jung Jiwon,Lee Jungmin,Park Heedo,Lim Young-Ju,Kim Eun Ok,Park Man-Seong,Kim Sung-Han 대한의학회 2022 Journal of Korean medical science Vol.37 No.17
Background: The potential for a nosocomial outbreak of coronavirus disease 2019 (COVID-19) from a fully vaccinated individual is largely unknown. Methods: In October 2021, during the time when the delta variant was dominant, a nosocomial outbreak of COVID-19 occurred in two wards in a tertiary care hospital in Seoul, Korea. We performed airflow investigations and whole-genome sequencing (WGS) of the virus. Results: The index patient developed symptoms 1 day after admission, and was diagnosed with COVID-19 on day 4 post-admission. He was fully vaccinated (ChAdOx1 nCoV-19) 2 months before the diagnosis. Three inpatients and a caregiver in the same room, two inpatients in an adjacent room, two inpatients in rooms remote from the index room, and one nurse on the ward tested positive. Also, two resident doctors who stayed in an on-call room located on the same ward tested positive (although they had no close contact), as well as a caregiver who stayed on an adjacent ward, and a healthcare worker who had casual contact with this caregiver. Samples from five individuals were available for WGS, and all showed ≤ 1 single-nucleotide polymorphism difference. CCTV footage showed that the index case walked frequently in the corridors of two wards. An airflow study showed that the air from the corridor flowed into the resident on-call room, driven by an air circulator that was always turned on. Conclusion: Transmission of severe acute respiratory syndrome coronavirus 2 from a fully vaccinated index occurred rapidly via the wards and on-call room. Care must be taken to not use equipment that can change the airflow.
Jiwon Koh,In-Gyu Song,Sae Yun Kim,Younghwa Jung,Seung Han Shin,Ee Kyung Kim,Han Suk Kim,Jung Hwan Choi,이주영 대한신생아학회 2016 Neonatal medicine Vol.23 No.2
Purpose: We aimed to assess the incidence of methicillin-resistant Staphylococcus aureus (MRSA) colonization and infection in a neonatal intensive care unit (NICU) by using various decolonization methods and to evaluate their efficacy. Methods: Medical records of all neonates who were admitted to the NICU of Seoul National University Children's Hospital were retrospectively reviewed. Surveillance culture were obtained for all neonates in the NICU 48 hours after admission. Three periods with different decolonization methods were compared; Period 1 was without any decolonization measures (July 1, 2009 to August 26, 2010). In period 2, intranasal mupirocin and chlorhexidine gluconate bathing were administered to MRSA-colonized neonates (August 27, 2010 to September 6, 2011). In period 3, only chlorhexidine bathing was performed for MRSA-colonized infants (September 7, 2011 to August 31, 2012). Results: A total of 1,378 infants were admitted to the NICU during the study period. Baseline demographic and clinical characteristics were similar among the 3 periods. The incidence of MRSA colonization per 1,000 patient-days was 6.27 for period 1, 7.02 for period 2, and 6.29 for period 3; however, these values were not significantly different. The incidence of MRSA infection was highest in period 3, with 0.69 cases per 1,000 patient-days; however, this finding was not significant. The MRSA infection/colonization ratio also did not differ significantly among the 3 study periods. Conclusion: Decolonization of MRSA in the NICU with the application of chlorhexidine gluconate bathing alone or in combination with intranasal mupirocin were not effective in decreasing the incidence of MRSA colonization and infection.