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( Ji Ung Na ),( Pil Cho Choi ),( Jeong Hun Lee ) 대한응급의학회 2012 대한응급의학회지 Vol.23 No.3
Purpose: Electrocardiography is a non-invasive tool for use in prediction of reperfusion and outcome of acute myocardial infarction. We attempted to determine initial electrocardiographic findings associated with failed resolution of STsegment elevation (STE) among patients with ST-segment Elevation Myocardial Infarction (STEMI) treated with a thrombolytic agent Methods: This retrospective study included patients with STEMI who were treated with a thrombolytic agent at the emergency department between October 2008 and March 2011. During the study period, among 331 patients with STEMI, 43 patients were enrolled. Resolution of STE was evaluated by comparison of initial electrocardiography (ECG) with follow-up ECG, taken 90 minutes after thrombolytic therapy. Determination of success or failure of resolution of STE was based on the electrocardiographic criteria of the American College of Cardiology and the American Heart Association (ACC/AHA). Patients were divided into two groups according to these criteria, and initial electrocardiographic findings were compared for the two groups. Results: Of a total of 43 patients, 22(55.16%) demonstrated failed resolution of STE after thrombolytic therapy. The risk of failed resolution of STE was approximately nine times higher in the anterior location of STE, compared to the inferior location of STE (OR 9.09, 95% CI, 1.46-94.69, p<0.01). In addition, the absence of reciprocal ST depression was associated with a six times higher risk of failed resolution of STE, compared with the presence of reciprocal ST depression (OR 6, 95% CI, 1.17-39.23, p=0.01). However, other electrocardiographic findings, including abnormal Q-wave, wide QRS complex, and QTc prolongation did not differ statistically between the two groups. Conclusion: Failed STE resolution after thrombolytic therapy was more frequent in STEMI patients with ST elevation in an anterior location or without reciprocal ST depression.
나지웅 ( Ji Ung Na ),송형곤 ( Hyoung Gon Song ) 대한외상학회 2006 大韓外傷學會誌 Vol.19 No.1
Purpose: Pyomyositis is a rare disease in temperature climate region. The diagnosis of pyomyositis is often delayed, and pyomyositis is often misdiagnosed in the emergency department. Methods: The medical records of 11 patients who were diagnosed as having traumatic pyomyositis in the emergency department at Samsung Medical Center in Seoul, Korea, between 2000 and 2006 were reviewed. Their clinical features, such as history, symptoms, clinical findings, duration from onset of symptoms to diagnosis, medical history, laboratory data, results of imaging studies and clinical course were collected. Results: The psoas muscles were most commonly involved. Computer tomography and magnetic resonance imaging aided in accurate diagnosis of the infection and of the extent of involvement. Incision, drainage, and antibiotics therapy eradicated the infectioin in all patients Conclusion: Pyomyositis should be a part of the differential diagnosis for patients with traumatic muscle pain. Radiologic evaluation, such as computer tomography and magnetic resonance imaging, must be considered in the diagnosis of traumatic pyomyositis. (K Korean Soc Traumatol 2006;19:81-88)
Chung Jihyuk,Na Ji Ung,Lee Jang Hee,Han Sang Kuk,최필조,Shin Dong Hyuk 대한응급의학회 2022 Clinical and Experimental Emergency Medicine Vol.9 No.3
Objective We aimed to investigate the causes and clinical and laboratory features of patients with ureteritis observed on intravenous contrast-enhanced abdominopelvic computed tomography (APCT) conducted in the emergency department (ED). Methods All APCTs conducted in the ED from November 2017 to November 2020 were investigated for the presence of ureteritis. The incidence of ureteritis, presumed cause of ureteritis, and clinical as well as laboratory features of patients with ureteritis were retrospectively analyzed. Results Ureteritis was observed in 422 out of 7,386 patients (5.7%) who underwent APCTs. The two main reasons for undergoing APCT in the ED were abdominal pain (49%) and infection focus workup (33%). The first major cause of ureteritis was urinary tract infection (UTI) (351 of 422, 83%). Most patients (85%) were febrile, but 208 (59%) exhibited no urinary symptoms such as dysuria, increased frequency, or residual urine sense. The second major cause of ureteritis was ureteral stones (42 of 422, 10%). Thirty-two of 42 patients (76%) had simple obstructive uropathy, while 24% of patients had a combined infection along with an obstruction. Other rare causes were malignancy and the spread of adjacent inflammation. Conclusion Ureteritis was a common finding observed in 5.7% of patients who underwent APCTs at the ED, and most of them were secondary to UTIs and ureteral stones. UTIs can cause ureteritis even without typical symptoms or signs suggestive of UTI, and diagnosis without an APCT can be difficult. More liberal use of APCTs should be considered when the cause of fever is difficult to diagnose.
Chae Minki,Na Ji Ung,Lee Jang Hee,Shin Dong Hyuk 대한응급의학회 2023 Clinical and Experimental Emergency Medicine Vol.10 No.1
Objective: A cardiothoracic ratio ≥0.50 is widely used as an indicator of cardiomegaly, but associations between the cardiothoracic ratio and left ventricular systolic dysfunction (LVSD) have not been investigated previously. We conducted this study to investigate the relationship between cardiothoracic ratio measured using computed tomography (CT) and left ventricular ejection fraction (LVEF), and to determine the optimal cardiothoracic ratio for predicting left ventricular systolic dysfunction (LVSD). Methods: A retrospective cross-sectional study was performed using data from patients who underwent both chest CT and echocardiography at the emergency department from January 1 to December 31, 2021. The patients were classified as normal, or having mild, moderate, and severe LVSD based on their LVEF, and the cardiothoracic ratios of each group were compared. The receiver operating characteristic (ROC) curve analyses were used to identify the optimal cardiothoracic ratio for prediction of mild, moderate, and severe LVSD. Results: The final study population included 444 patients. The median CT-measured cardiothoracic ratio was 0.54 for patients with normal LVEF, and 0.60 for patients with LVSD (P<0.001). The optimal CT-measured cardiothoracic ratios for predicting mild, moderate, and severe LVSD were 0.56, 0.59, and 0.60, and their areas under the ROC curve were 0.653, 0.690, and 0.680, and negative predictive values were 90%, 94%, and 98%, respectively. Conclusion: The best cutoff value for a CT-measured cardiothoracic ratio suggestive of LVSD was 0.56, which is very different from the 0.50 value typically considered an abnormal cardiothoracic ratio. The CT-measured cardiothoracic ratio ≥0.56 can be used as a rough indicator of mild LVSD, and a ratio <0.60 can exclude severe LVSD with a high degree of confidence.
Byambakhand Battumur,Ji Eun Lee,Soo Hyung Park,You-Jung Choi,Dong Oh Kang,Eun Jin Park,Ji Bak Kim,Jah Yeon Choi,Seung Young Roh,Jin Oh Na,Cheol Ung Choi,Jin Won Kim,Seung Woon Rha,Chang Gyu Park,Eung 대한내과학회 2023 The Korean Journal of Internal Medicine Vol.38 No.4
Background/Aims: Cardiorespiratory fitness (CRF), as measured by maximal oxygen consumption (VO2max), is an important independent predictive factor of cardiovascular outcomes in patients with heart failure (HF). However, it is unclear whether conventional equations for estimating CRF are applicable to patients with HF with preserved ejection fraction (HFpEF). Methods: This study included 521 patients with HFpEF (EF ≥ 50%) whose CRF was directly measured by cardiopulmonary exercise test using a treadmill. We developed a new equation (Kor-HFpEF) for half of the patients in the HFpEF cohort (group A, n = 253) and validated it for the remaining half (group B, n = 268). The accuracy of the Kor-HFpEF equation was compared to that of the other equations in the validation group. Results: In the total HFpEF cohort, the directly measured VO2max was significantly overestimated by the FRIEND and ACSM equations (p < 0.001) and underestimated by the FRIEND-HF equation (p <0.001) (direct 21.2 ± 5.9 mL/kg/min; FRIEND 29.1 ± 11.8 mL/kg/min; ACSM 32.5 ± 13.4 mL/kg/min; FRIEND-HF 14.1 ± 4.9 mL/kg/min). However, the VO2max estimated by the Kor-HFpEF equation (21.3 ± 4.6 mL/kg/min) was similar to the directly measured VO2max (21.7 ± 5.9 mL/kg/min, p = 0.124), whereas the VO2max estimated by the other three equations was still significantly different from the directly measured VO2max in group B (all p < 0.001). Conclusions: Traditional equations used to estimate VO2max were not applicable to patients with HFpEF. We developed and validated a new Kor-HFpEF equation for these patients, which had a high accuracy.
Park, Hea Jung,Kim, Ji Na,Yoo, Hyun-Ji,Wee, Kyung-Ryang,Kang, Sang Ook,Cho, Dae Won,Yoon, Ung Chan American Chemical Society 2013 Journal of organic chemistry Vol.78 No.16
<P>On the basis of the results of frontier orbital considerations, 4-substituted-2′-pyridyltriazoles were designed to serve as ancillary ligands in 2-phenylpyridine main ligand containing heteroleptic iridium(III) complexes that display deep blue phosphorescence emission. The iridium(III) complexes, <B>Ir1</B>–<B>Ir7</B>, prepared using the new ancillary ligands, were found to display structured, highly quantum efficient (Φ<SUB>p</SUB> = 0.20–0.42) phosphorescence with emission maxima in the blue to deep blue 448–456 nm at room temperature. In accord with predictions based on frontier orbital considerations, the complexes were observed to have emission properties that are dependent on the electronic nature of substituents at the C-4 position of the pyridine moiety of the ancillary ligand. Importantly, placement of an electron-donating methyl group at C-4′ of the pyridine ring of the 5-(pyridine-2′-yl)-3-trifluoromethyl-1,2,4-triazole ancillary ligand leads to an iridium(III) complex that displays a deep blue phosphorescence emission maximum at 448 nm in both the liquid and film states at room temperature. Finally, an OLED device, constructed using an Ir-complex containing the optimized ancillary ligand as the dopant, was found to emit deep blue color with a CIE of 0.15, 0.18, which is close to the perfect goal of 0.15, 0.15.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/joceah/2013/joceah.2013.78.issue-16/jo4012514/production/images/medium/jo-2013-012514_0013.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jo4012514'>ACS Electronic Supporting Info</A></P>