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Thrombus entrapped by patent foramen ovale in a patient with pulmonary embolism -a case report-
남상범,김찬미,조성아,정성찬,심연희 대한마취통증의학회 2015 Korean Journal of Anesthesiology Vol.68 No.1
Thrombus-in-transit appears to increase the risk of mortality compared to pulmonary embolism alone and can requirealteration in therapeutic plan. We present the case of a biatrial thromboembolus caught in transit across a patent foramenovale diagnosed by intraoperative transesophageal echocardiogram in a 69-year-old female with acute pulmonaryembolism and subsequent acute cerebral infarction. We suggest that echocardiography should be performed in a patientwith suspected pulmonary thromboembolism to evaluate right heart function and diagnose emboli in transit.
남상범,김주현,신언교 대한교통학회 2018 대한교통학회지 Vol.36 No.5
Many studies which considered volume and lanes of opposite straight traffic have been carried out to improve left-turn traffic flow at the signalized intersection. However, there were no studies reflect signal intervals which much influenced on the efficiency of the left-turn traffic flow. For the purpose of effective left-turn treatment, we considered signal intervals of the opposite straight traffic and left-turn traffic as well as the volume and lanes of opposite straight traffic. Based on the simulation results, left-turn delay of reduced significantly by the application of protected/permissive left-turn (PPLT) in case of congested left-turn traffic illustrated as left-turn signal time of 10 or 20second, but not as much as congested left-turn traffic in case of uncongested left-turn traffic such as left-turn signal time of 30second. Therefore, it is concluded that the heavier the left-turn traffic congestion, the greater the effect of protected/permissive left-turn (PPLT) in terms of reducing delay. Simulation results according to the variation of cycle length as well as the volume and signal interval of left-turn and opposite straight traffic can be used to find the best left-turn treatment among protected left-turn (PRLT), permissive left-turn (PELT) and protected/permissive left-turn (PPLT) at a signalized intersection. 지금까지 신호교차로의 좌회전 운영 효율성 향상을 위한 많은 연구가 수행되어 왔다. 하지만 대향 직진 차로수와 교통량만을 고려한 분석으로 교차로의 운영 효율성을 판단했다. 신호교차로의 효율성 판단 시 신호시간이 중요한 변수임에도 불구하고 이를 고려하여 체계적으로 분석한 연구는 없었다. 이에 본 연구에서는 대향 직진 신호시간, 좌회전 신호시간 등의 신호 조건을 포함시켜 좌회전 처리방안(PRLT, PELT, PPLT)을 분석했다. 또한 조건 변화에 따른 상호관계를 고려하여 교차로에서의 효율적인 좌회전 처리방안을 제시하였다. 분석 결과 좌회전 신호시간이 10, 20초로 짧아서 혼잡한 경우는 PPLT 적용 후 PRLT보다 좌회전 지체시간이 크게 감소하였다. 반면에 좌회전이 혼잡하지 않은 30초의 경우는 PPLT 도입 효과가 크지 않은 것으로 분석되었다. 따라서 좌회전 혼잡이 큰 교차로일수록 PPLT 도입 필요성이 높으며 도입 효과도 클 것으로 판단된다. 차로별 대향직진 교통량과 좌회전 교통량, 신호시간(대향직진 신호시간과 좌회전 신호시간 및 신호주기) 등을 조사하여 시뮬레이션 결과에 적용하면 효율적인 좌회전 처리방식인 PPLT와 신호시간 운영계획 수립에 활용될 수 있다.
The CobraPLATM During Anesthesia with Controlled Ventilation: A Clinical Trial of Efficacy
남상범,심연희,김민수,유영철,이윤우,한동우,이종석 연세대학교의과대학 2006 Yonsei medical journal Vol.47 No.6
The CobraPLATM (CPLA) is a relatively new supraglottic airway device that has not been sufficiently investigated. Here, we performed a prospective observational study to evaluate the efficacy of the CPLA during controlled ventilation. In 50 anesthetized and paralyzed patients undergoing elective surgery a CPLA was inserted and inflated to an intracuff pressure of 60 cm H2O. The success rate of insertion upon the first attempt was 82% (41/50), with a mean insertion time of 16.3 4.5 seconds. The adequacy of ventilation was assessed by observing the end tidal CO2 waveform, movement of the chest wall, peak airway pressure (13.5 cm H2O), and leak fraction (4%). We documented the airway sealing pressure (22.5 cm H2O) and noted that the the site of gas leaks at that pressure were either at the neck (52%), the abdomen (46%), or both (2%). In 44 (88%) patients, the vocal cords were visible in the fiberoptic view through the CPLA. There was no gastric insufflation during the anesthesia. Respiratory and hemodynamic parameters remained stable during CPLA insertion. Postoperative blood staining of CPLA was minimal, occurring in 22% (11/50) of patients. Mild and moderate throat soreness was reported in 44% (22/50) and 4% (2/50) of patients, respectively. Lastly, mild dysphonia was observed in 6% (3/50) of patients and mild dysphagia in 10% (5/50) of patients. Our results indicated that the CPLA is both easy to place and allows adequate ventilation during controlled ventilation.
Design of material removal rate to reduce machining time of dental crown
남상범,김병기 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7
Freeform surface grinding is one of the commonly used dental medical manufacturing processes. In dentistry machining, zirconia is one of main workpieces used for artificial teeth. Machining process for grinding of the ceramic usually takes a long time. In order to reduce this production time, it is critical to apply proper grinding parameters while maintaining high quality of machined artificial teeth. Required material removal rate (MRR) for workpiece can be used to determine the grinding parameters. However, it has been hard to find grinding parameters achieving a proper MRR of complex 3D models like as human teeth. In this study, MRR is predicted by using geometric data in the engagement region between machining bur and its workpiece while the MRR varies all along the tool path. Simulations of the machining time shows that the machining time can be reduced by adjusting the bur’s feed rate to maintain the predicted MRR.
남상범(Sang Beom Nam),윤덕미(Duck Mi Yoon),이윤우( 대한통증학회 1998 The Korean Journal of Pain Vol.11 No.1
N/A Background: Idiopathic sudden sensorineural hearing loss(ISSHL) has been generally defined as an abrupt loss of auditory acuity without precipitating factors. Since ISSHL was first described as a disease entity, numerous reports assessing a variety of treatment regimens have been published. But its etiology, pathogenesis, treatment, and prognosis are controversial at the present time. Stellate ganglion block(SGB) has been used for the treatment of ISSHL by vasodilatation and increased blood flow to the inner ear. Methods: We reviewed the records of 152 patients to investigate the efficacy of SGB for ISSHL. the control group was managed with medications such as hypaque, heparin, steroid, nicotinic acid, and vitamins. The SGB group was managed with SGB and the same medications. SGB was performed with 8 ml of 1.0% mepivacaine. The efficacy of treatment was evaluated by pure-tone average following therapy. The recovery of hearing was defined as Siegels criteria I, II, or III. Results: The recovery rate of the SGB group was higher than that of the control group(61.5 vs. 42.9%, p<0.05). The recovery rate was higher in patients who were treated early, within 7 days from the onset of symptoms, especially in the SGB group(79.7%). And in the case that initial hearing loss was severe (>70dB), the SGB group had a higher recovery rate(64.2%) than the control group(42.5%). Conclusions: SGB is thought to be a useful therapy for ISSHL, especially in the patients who were treated soon after onset or whose initial hearing loss was severe.