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박봉석,이원용,임정현,나용준,김용한,김형수 대한흉부외과학회 2017 Journal of Chest Surgery (J Chest Surg) Vol.50 No.3
Outcomes of ventricular septal rupture (VSR) as a complication of acute myocardial infarction are extremely poor, with an in-hospital mortality rate of 45% in surgically treated patients and 90% in patients managed with medication. Delaying surgery for VSR is a strategy for reducing mortality. However, hemodynamic instability is the main problem with this strategy. In the present case, venoarterial extracorporeal membrane oxygenation (ECMO) was used to provide stable hemodynamic support before the delayed surgery. Awake ECMO was also used to avoiding the complications of sedatives and mechanical ventilation. Here, we describe a successful operation using awake ECMO as a bridge to surgery.
Surgical Outcomes for Native Valve Endocarditis
박봉석,이원용,나용준,이홍규,구병모,양준태 대한흉부외과학회 2020 Journal of Chest Surgery (J Chest Surg) Vol.53 No.1
Background: The aim of this study was to evaluate the short-term and long-term results of surgical treatment for native valve endocarditis (NVE) and to investigate the risk factors associated with mortality. Methods: Data including patients’ characteristics, operative findings, postoperative results, and survival indices were retrospectively obtained from Hallym University Sacred Heart Hospital. Results: A total of 29 patients underwent surgery for NVE (affecting the mitral valve in 20 patients and the aortic valve in 9) between 2003 and 2017. During the follow-up period (median, 46.9 months; interquartile range, 19.1.107.0 months), the 5-year survival rate was 77.2%. In logistic regression analysis, body mass index (p=0.031; odds ratio [OR], 0.574; 95% confidence interval [CI], 0.346.0.951), end-stage renal disease (ESRD) (p=0.026; OR, 24.0; 95% CI, 1.459.394.8), and urgent surgery (p=0.010; OR, 34.5; 95% CI, 2.353.505.7) were significantly associated with in-hospital mortality. Based on Cox proportional hazard regression analysis, the statistically significant predictors of long-term outcomes were hypertension, ESRD, and urgent surgery. Conclusion: Surgical treatment for NVE is associated with considerable mortality. The in-hospital mortality and 5-year survival rates of this study were 13.8% and 77.2%, respectively. Underlying conditions, including hypertension and ESRD, and urgent surgery were independent risk factors for unfavorable outcomes.
박봉석,김홍근 제어로봇시스템학회 2013 제어로봇시스템학회지 Vol.19 No.2
자연계에서 빈번히 목격되는 군집 현상과 그 효용성의 고찰에 기인하여, 최근 다중 로봇의 협업에 대한 연구가 활발히 수행되고 있다. 그 중, 본 논문에서는 다중 이동 로봇의 군집 제어 방법론들을 설명하고, 그와 관련된 최신 결과들도 소개한다. 특히 군집 제어 문제를 해결하기 위한 대표적인 방식인 행동 기반 접근법, 가상 구조 접근법, 선도-추종 접근법, 그래프 이론기반 접근법 위주로 소개한다.