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Role of charcoal tattooing in localization of recurred papillary thyroid carcinoma
Hyungju Kwon,Soon Young Tae,Su-Jin Kim,Kyeong Cheon Jung,Ji-Hoon Kim,Kyu Eun Lee,Yeo-Kyu Youn 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.88 No.3
Purpose: Surgical excision is the definitive treatment for localized recurrence of papillary thyroid carcinoma. Reoperation for recurrence, however, is challenging and associated with increased operative times and complication rates. For safe and effective reoperation, ultrasound-guided charcoal tattooing localization can be used. The aim of this study was to investigate the feasibility and safety of the ultrasound-guided charcoal tattooing localization. Methods: Between November 2012 and August 2013, ten patients underwent preoperative charcoal tattooing localization for twelve recurrent lesions. Patient demographics, pathologic features, and operation results were reviewed. Results: The technical success rate of charcoal tattooing was 100%. Eight patients had one recurrent lesion, and two patients had double lesions. Among these 12 recurrent lesions, three (25%) were found in level II, four (33%) in level IV, four (33%) in level VI, and one (8%) was found in the thyroidectomy bed site. The mean size of lesions was 0.87 ± 0.35 cm. Of these 10 patients, eight patients underwent selective lymph node dissection, one patient underwent modified radical neck dissection, and one patient underwent recurrent mass excision. Transient hypocalcemia developed in one patient, and no recurrent laryngeal nerve palsy occurred. There were no major complications related to the injection of the charcoal. The mean follow-up period after reoperation was 8.6 ± 2.7 months; in the follow-up ultrasound, there were no remnant lesions in all patients. Conclusion: Preoperative ultrasound-guided charcoal tattooing localization for recurrent thyroid cancer appears to be a feasible and safe procedure for reoperation. Further evaluation is warranted in larger patients" cohorts.
Secondary Ride 해석을 위한 노면 생성 프로그램 개발
권형주(Hyungju Kwon),계경태(Kyungtae Kye),김영준(Youngjun Kim),박순조(Soonjo Park),장지현(Jihyun Chang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For the exact ride analysis, it is important that a road information should be modeled more precisely. There are two ways of studies in modeling road. One is the experimental method, measuring the road height and displaying the road information in the PSD level as is proposed by ISO, MIRA and Wong. The other method is to generate the road information based on the random signal and to analyze the dynamic response of the simple vehicle model driven through the uneven road. Considering that there is a certain relation between the roads that left wheel and right wheel are passing on, it is clear that the road for full vehicle simulation is essential. Therefore we intend to develop the RPG(Road Profile Generator) program in this research, which is used for generating the road profile according to the rule of ISO, MIRA and Wong standard. We can analyze the secondary ride characteristics of the vehicle more precisely through the full vehicle simulation using this ADAMS road file produced by the RPG, which is the basic study of secondary ride analysis.
Yoon-Hye Kwon,Kyu Eun Lee,Hyungju Kwon,June Young Choi,Do Hoon Koo,Eunyoung Kim,Yeo-Kyu Youn 대한종양외과학회 2013 Korean Journal of Clinical Oncology Vol.9 No.1
Purpose: Whether the level of the preoperative parathyroid hormone (PTH) is a risk factor of postoperative hypoparathyroidism remains unclear. The aim of this study was to evaluate the predictive value of preoperative PTH for the hypoparathyroidism following total thyroidectomy. Methods: Five hundred two patients performed total thyroidectomy from January 2009 to July 2010 in Seoul National University Hospital were enrolled. Demographics, operative variables, and the development of hypoparathyroidism were collected and evaluated. Results: A total of 502 patients were enrolled during the study period. Patients had a mean age of 48.1±12.1 years (range, 16 to 95 years) and showed a female predominance (n=420, 83.7%). Preoperative PTH of 44.5 pg/mL was recommended as cut-off value. Transient hypoparathyroidism developed 2.4 times (95% confidence interval [CI], 1.1 to 5.1) more frequently in low PTH group (P=0.021). Percentage decline of the preoperative PTH also showed significant association with transient hypoparathyroidism. When the value of 73.9% decline was used, the chance of transient hypoparathyroidism was 3.3 times (95% CI, 2.0 to 5.5) higher in high percentage decline group (P<0.001). Correlation between postoperative PTH level and development of transient hypoparathyroidism was not found (P=0.171). In regard to the permanent hypoparathyroidism, there were no significant differences in all factors. Conclusion: Preoperative PTH level and percentage decline can be used as a predictive factor for postoperative hypoparathyroidism. In patients with low PTH level (<44.5 pg/mL), caution should be given to prevent injury of the parathyroid glands.