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체외제거가 필요한 중독환자에서 응급의학과 의사에 의해 시행된 지속적신대체요법에 대한 임상적 고찰
안정환,최상천,정윤석,민영기,Ahn, Jung-Hwan,Choi, Sang-Cheon,Jung, Yoon-Seok,Min, Young-Gi 대한임상독성학회 2009 대한임상독성학회지 Vol.7 No.2
Purpose: Extracorporeal elimination of drugs is a critical part of managing poisonings, although the indications and optimal method remain a matter of debate. The aim of this study is to report our clinical experiences with continuous renal replacement therapy (CRRT), as performed by emergency room physicians, as method of extracorporeal drug elimination in patients with poisoning. Methods: This study was a retrospective study of the consecutive patients who underwent CRRT, as performed by an emergency room physician, for acute poisoning. The patient characteristics, the kinds of drugs and the method of extracorporeal elimination were analyzed by reviewing the patients' charts. Results: During eleven months, 26 patients with acute poisoning underwent extracorporeal elimination (2 patients; intermittent hemodialysis, 24 patients; CRRT). The mean time from the decision to performing extracorporeal elimination was $206.0{\pm}36.8$ minutes for intermittent hemodialysis, $62.9{\pm}8.5$ minutes for continuous venoveno-hemodiafiltration (CVVHDF) and $56.6{\pm}6.8$ minutes for charcoal hemoperfusion. For the patients with CRRT, CVVHDF was conducted in 10 patients (3 patients; valproic acid, 2 patients; Lithium, 1 patient; salicylates, 1 patient; methanol) and charcoal hemoperfusion by using CRRT was done in 14 patients (13 patients; paraquat, 1 patient; dapsone). For the 12 patients who required hemodialysis due to severe poisoning, 7 patients underwent CRRT because of their unstable vital signs. Conclusion: CRRT was an effective method of extracorporeal drug elimination in patients with acute poisoning, and especially for the cases with unstable vital sign and for those patients who required an early start of extracorporeal elimination according to the characteristics of the drug. (ED note: the writing of the abstract was not clear. Check it carefully.)
중증 리튬 증독 후 발생한 심정지 1예 - 어려운 진단
안정환,최상천,윤상규,정윤석,Ahn Jung Hwan,Choi Sang Cheon,Yoon Sang Kyu,Jung Yoon Seok 대한임상독성학회 2005 대한임상독성학회지 Vol.3 No.2
Lithium is mainly prescribed for manic and depressive disorder, also frequently prescribed for the other diseases such as migraine, cluster headache, alcoholism, and obsessive-compulsive disorder. An acute lithium intoxication occurs in cases of patients ingesting large amount lithium at a time, a chronic lithium intoxication occurs in patients on chronic lithium therapy. Acute or chronic lithium poisoning occurs frequently in case of patients on chronic lithium therapy ingesting larger dose than prescribed. Manifestations of lithium poisoning are various. It is possible nervous, cardiovascular, renal, gastrointestinal and endocrine systems to be involved. Due to intracellular high concentration, mortality rate is high in acute lithium intoxication patients on chronic lithium therapy. We report a case of acutely intoxicated 40-year-old male on chronic lithium therapy. His chief complaints were deterioration and high fever. On his arrival to an emergency department, he was in cardiac arrest. He restored return of spontaneous circultion (ROSC) 5 minutes later after cardiopulmonary cerebral resuscitation (CPCR) and referred to department of internal medicine for hemodialysis. Vigorous treatment was given to the patient, but he was expired at 4th hospital day.
안정환,정윤석,Ahn, Jung-Hwan,Jung, Yoon-Seok 대한임상독성학회 2004 대한임상독성학회지 Vol.2 No.2
Hydrogen sulfide is a colorless, and malodorous 'rotten eggs' gas that results from the decay of organic material. It is a byproduct of industry and agriculture. The mechanism of its toxicity is primarily related to inhibition of oxidative phosphorylation, which causes a decrease in available cellular energy. Because there is no rapid method of detection that is of clinical diagnostic use, management decisions must be made based on history, clinical presentation, and diagnostic tests that imply hydrogen sulfide's presence. Although there is some anecdotal evidence to suggest that the early use of hyperbaric oxygen is beneficial, supportive care remains the mainstay of therapy. We describe an occupational exposure to hydrogen sulfide gas in 51-year-old man. While cleaning the sewage of pigs. he became unconscious. When he arrived in the emergency department, he had irritability and confused mentality. The typical smell of rotten eggs on clothing and exhaled air were enough to be considered to be exposed to hydrogen sulfide. Hyperbaric oxygen therapy was performed. He had a recovery to normal function.
적층조건 최적화된 압전 후막 소자를 이용한 진동 압전 에너지 하베스팅 시스템
안정환(Jung Hwan Ahn),홍성도,우민식(Min Sik Woo),조대흥(Dae Heung Cho),조재용(Jae Yong Cho),황성주(Sung Joo Hwang),성태현(Tae Hyun Sung) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Research about optimizing lamination condition in order to improve the properties of piezoelectric thick films fabricated by tape casting has found that the highest piezoelectric strain constant (260.2 pC/N) is obtained at 2 MPa pressure and 180 second press time lamination condition. The sintering temperature of the samples was 1100 °C. A piezoelectric energy harvesting (PEH) system was subsequently designed based on a cantilever beam structure, in which an optimized PZT thick film was attached to a stainless steel substrate. Analysis of the frequency tendency of this system’s open circuit voltage identified a maximum peak of 4.08 V <SUB>RMS</SUB> and a resonance frequency of 35Hz. Measurement of the output voltage and output power of the PEH system also revealed that a maximum output power density of 0.21 mW/㎤ could be achieved at a matching load of 900 kΩ. These results show that a material with a sufficiently high energy density for use in energy harvesting devices can be achieved by subjecting a PZT thick film to optimized lamination conditions.
안정환 ( Jung Hwan Ahn ),최상천 ( Sang Cheon Choi ),윤상규 ( Sang Kyu Yoon ),정윤석 ( Yoon Seok Jung ) 대한임상독성학회 2005 대한임상독성학회지 Vol.3 No.2
Lithium is mainly prescribed for manic and depressive disorder, also frequently prescribed for the other diseases such as migraine, cluster headache, alcoholism, and obsessive-compulsive disorder. An acute lithium intoxication occurs in cases of patients ingesting large amount lithium at a time, a chronic lithium intoxication occurs in patients on chronic lithium therapy. Acute or chronic lithium poisoning occurs frequently in case of patients on chronic lithium therapy ingesting larger dose than prescribed. Manifestations of lithium poisoning are various. It is possible nervous, cardiovascular, renal, gastrointestinal and endocrine systems to be involved. Due to intracellular high concentration, mortality rate is high in acute lithium intoxication patients on chronic lithium therapy. We report a case of acutely intoxicated 40-year-old male on chronic lithium therapy. His chief complaints were deterioration and high fever. On his arrival to an emergency department, he was in cardiac arrest. He restored return of spontaneous circulation (ROSC) 5 minutes later after cardiopulmonary cerebral resuscitation (CPCR) and referred to department of internal medicine for hemodialysis. Vigorous treatment was given to the patient, but he was expired at 4th hospital day.
Analysis of Tensile Strength Characteristics of ACSR due to White Rust
박대근,안정환,곽민준,정미희,최철,Park, Dae Keun,Ahn, Jung Hwan,Kwak, Minjun,Jung, Mihee,Choi, Cheol Korea Electric Power Corporation 2022 KEPCO Journal on electric power and energy Vol.8 No.1
In this study, a tensile test, one of the mechanical tests, was performed with the collected natural aging ACSR. In order to be used as basic data for predicting the replacement cycle of ACSR, the tensile strength with the normal cables was compared for cables which was caused white rust due to exposure of the hard-drawn aluminum wire surface. Among the ACSR wires collected from various regions, white rust was found on the surface of the small wire, and by checking the tensile strength of them, we would like to suggest the criteria for the ACSR replacement cycle, focusing on changes in mechanical properties.
우연한 협죽도(Nerium indicum) 복용에 의한 디지털리스양(digitalis-like) 중독 증상
송예완,안정환,이정아,김기운,최상천,정윤석,Song, Ye-Wan,Ahn, Jung-Hwan,Lee, Chung-Ah,Kim, Gi-Woon,Choi, Sang-Cheon,Jung, Yoon-Seok 대한임상독성학회 2009 대한임상독성학회지 Vol.7 No.1
Although Nerium indicum poisoning is a globally rare occurrence, Nerium oleander poisoning is known to occur frequently in the Mediterranean regions. To our knowledge, this is the first reported case of accidental Nerium indicum poisoning in Korea. Its poisoning symptoms and signs are similar to that of digitalis poisoning, because of the presence of cardiac glycosides in Nerium indicum. A 16-year-old boy was admitted to the emergency department four hours prior to the accidental ingestion of Nerium indicum petals. The patient complained of nausea, vomiting, and dizziness. His initial vital signs were stable; laboratory blood test results were within normal levels, except for the blood digoxin level (1.5 ng/dL). An electrocardiogram (ECG) analysis showed normal sinus rhythm, progressive PR prolongation and second-degree Morbiz type I AV block. Conservative treatments including activated charcoal administration were conducted, because toxic symptoms and signs were not severe. The patient was admitted to the intensive care unit for close observation. His ECG was converted to normal rhythm after 1 day and the toxic symptoms and signs were completely resolved after 4 days.