• 제목/요약/키워드: Ablation Rate

검색결과 184건 처리시간 0.023초

Treatment of Atrial Fibrillation in Elderly Patients with the Cox Maze Procedure Concurrently with Other Cardiac Operations

  • Kuh, Ja Hong;Song, Joon Young;Kim, Tae Youn;Kim, Jong Hun;Choi, Jong Bum
    • Journal of Chest Surgery
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    • 제50권3호
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    • pp.171-176
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    • 2017
  • Background: In elderly patients who have atrial fibrillation (AF), surgical ablation of the arrhythmia during cardiac surgery may be challenging. Despite the reported advantages of ablating AF with the Cox maze procedure (CMP), the addition of the CMP may complicate other cardiac operations. We evaluated the effect of the CMP in elderly patients concurrent with other cardiac operations. Methods: From October 2007 to December 2015, we enrolled 27 patients aged >70 years who had AF and who underwent the CMP concurrently with other cardiac operations. The mean preoperative additive European System for Cardiac Operative Risk Evaluation score was $8{\pm}11$ (high risk). Results: Only 1 hospital death occurred (4%). The Kaplan-Meier method showed a high 5-year cumulative survival rate (92%). At mean follow‐up of 51 months, 23 patients (89%) had sinus rhythm conversion. The postoperative left atrial dimensions did not significantly differ between the 8 patients who had reduction plasty for giant left atrium ($53.4{\pm}7.5cm$) and the 19 patients who did not have reduction plasty ($48.7{\pm}5.7cm$). Conclusion: In patients aged >70 years, concurrent CMP may be associated with a high rate of sinus rhythm conversion without increased surgical risk, despite the added complexity of the main cardiac procedure.

Er:YAG 레이저를 이용한 법랑질 및 상아질 와동 형성시의 치수내 온도변화 (Intrapulpal Temperature Change during Cavity Preparation on the Enamel and Dentin with an Er:YAG Laser)

  • 양희영;김미은;김기석
    • Journal of Oral Medicine and Pain
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    • 제30권4호
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    • pp.457-464
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    • 2005
  • 본 연구의 목적은 법랑질과 상아질에서 와동을 형성하는 동안 치수벽에서 발생하는 온도변화를 관찰하여 치수 손상 가능성을 평가하고자 하였고 조사반복율의 차이에 따른 영향도 함께 조사하고자 하였다. 발거된 건전 대구치에 access cavity를 형성하고 레진 block에 식립한 다음, 온도측정센서를 레이저가 조사될 치수벽에 위치시켰다. 레이저를 조사하는 동안 분사되는 물이 온도변화에 영향을 주지 않도록 하기 위해 레진을 이용하여 occlusal cap을 만들고 가운데 작은 구멍을 내어 온도측정센서가 들어갈 수 있도록 하였으며 치아의 내부는 생리식염수로 채웠다. 치아표본은 법랑질실험군과 상아질 실험군으로 나누고 각 군당 치아표본수는 5개로 하였다. 상아질군에서는 모든 표본의 상아질 두께를 일정하게 하기 위하여, 고속핸드피스를 이용하여 상아질 두께가 2 mm가 되도록 삭제하여 사용하였다. $3\;mm{\times}2\;mm$의 일정한 면적을 치면에 표시한 다음 와동을 형성하였는데, 법랑질군에서는 상아질 이 노출되는 순간까지, 상아질군에서는 상아질벽이 천공되는 순간까지 온도변화를 조사하였다. 조사방식은 접촉식(contact mode)으로 하였으며 레이저가 한번 조사되는 시간을 3초 이하로 유지하면서 와동을 형성하였다. 300 mJ의 펄스 에너지, 10, 15, 20 Hz의 조사반복율, 1.6 ml/min의 물분사량이 가해지는 조건에서 레이저 조사측의 온도변화를 측정하였다. 본 연구의 결과에 따르면, Er:YAG 레이저 조사시 적절한 양의 물분사가 이루어질 때, 즉 1.6 ml/min의 물분사량과 300 mJ의 펄스에너지의 조건에서 법랑질에서 와동형성시 10, 15, 20 Hz 의 조사반복율 모두에서 온도상승이 미미하여 치수손상을 야기할 만한 온도상승이 이루어 지지 않았고 세 군 간의 유의한 차이도 존재하지 않았다(p=0.358). 상아질에서의 와동형성시에는 조사반복율이 증가할수록 온도상승이 컸지만(p=0.001), 실제 온도상승은 여전히 치수손상을 야기 하지 않는 안전한 범위에 있었다. 결론적으로 적절한 양의 물이 레이저 조사면에 적절하게 분사되기만 하면 법랑질이나 상아질에 서의 와동형성은 안전하게 시행할 수 있을 것으로 생각된다.

Factors Predicting Early Release of Thyroid Cancer Patients from the Isolation Room after Radioiodine-131 Treatment

  • Fatima, Nosheen;Zaman, Maseeh uz;Zaman, Areeba;Zaman, Unaiza;Tahseen, Rabia;Shahid, Wajiha
    • Asian Pacific Journal of Cancer Prevention
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    • 제17권1호
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    • pp.125-129
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    • 2016
  • Background: Patients with differentiated thyroid cancers (DTC) who receive radioactive iodine-131 (RAI) are released from isolation when their dose rate is below the regulatory requirements. The purpose of this study was establish predicting factors for early release from the isolation facility after RAI administration in patients with DTC. Materials and Methods: This was a prospective study which included 96 (58 females and 38 males) patients with DTC who had received RAI from April 2013 till August 2015. The study was duly approved by the ethical committee of the institute. Patients who had complete information of primary tumor size (PTS), serum TSH, stimulated thyroglobulin level [sTg] with antibodies (IU/ml) at the time of RAI treatment were included. All had a normal serum creatinine level. To attain lower effective half-life good hydration and administration of soft laxative were ensured. Dose rate was measured (immediately, 24 h and 36 h) at 1 meter distance from anterior mid trunk and a dose rate <$50{\mu}Sv/h$ was considered as the releasing criterion. At 24 h 50 patients were released while the remaining 46 patients were released at 36 h. A post-ablative whole body scan (PA-WBIS) was performed 5-8 days after RAI ablation in all patients. Results: Patients released after 24 h were significantly younger, had smaller lesions with higher proportion of papillary cancer, lower sTg, lower sTg/TSH ratio and had received a lower dose of RAI as comapred to those who were discharged after 36 h. Serum TSH and gender were not found to have any significant correlation between two cohorts. ROC and multivariate analysis have shown age ${\leq}37years$, PTS ${\leq}3.8cm$, $RAI{\leq}150mCi$, $sTg{\leq}145ng/ml$ and $sTg/TSH{\leq}1.085$ as strong indepedent predictors for early release. Conclusions: We conclude that younger age (${\leq}37years$), smaller tumor size (${\leq}3.8cm$), lower RAI dose (${\leq}150mCi$), lower sTg (${\leq}145ng/ml$) and a lower sTg/TSH ratio (${\leq}1.085$) are significant independent predictors for release at 24 h after RAI treatment in DTC patients. Effective utilization of these factors could help the treating physicians to use limited number of internment facilities with higher throughput, lower cost and lower psychological stress to patients.

구강 결손부에 적용된 요골 유리전완 피부피판 적용례 분석 (Clinical Cases Analysis of Forearm Free Fasciocutaneous Flaps on Oral Cavity Defect Area)

  • 김욱규;이광호;송원욱;황대석;김용덕;신상훈;김종렬;정인교
    • Maxillofacial Plastic and Reconstructive Surgery
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    • 제32권4호
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    • pp.324-331
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    • 2010
  • The radial forearm free flap (RFFF) has become a workhorse flap as a means of reconstructing surgical defects in the head and neck region. We have transferred 12 RFFFs with fasciocutaneous type on oral cavity defects in 12 patients after cancer resection and submucous fibrotic lesion ablation from 2005 to 2007 at Department of oral and maxillofacial surgery, Pusan National University Hospital. We reviewed retrospectively patients' charts and followed up the patients. Clinical analysis on the cases with RFFFs focusing on flap morbidity, indications and available vessels was done. The results of study are follows: 1. RFFF could be applied for all kind of defects after resection of tongue, floor of mouth, buccal mucosa, denuded bone of palate, maxilla, and mandible. 2. All free flaps could be used for primary reconstruction. The survival rate of 12 RFFFs was 92%. Partial marginal loss of the flaps was shown as 3 cases among 12 cases. Large size-vessels like superior thyroid artery, facial artery, internal jugular vein were favorable for microvascular anastomosis. 3. Parenteral nutrition instead of nasal L-tube also can be favorable for postoperative a week for better healing of the flap if the patients couldn't be tolerable with nasal tubing. 4. Donor sites with thigh skin graft were repaired with wrist band for 2 weeks. The complications included scarring, abnormal sensation on hand, and reduced grip strength in few patients, but those didn't induce major side effects. 5. Most RFFFs were well healed even if mortality rate of cancer patients was shown as 50% (5/10 persons). The mortality of patients was not correlated with morbidity of the flaps. We could identify the usefulness of RFFF for restoration of oral function, esthetics if the flap design, tissue transfer indications, and well controlled operation are proceeded.

그래프 합성곱 신경망을 이용한 다중 관측소 기반 지진 이벤트 분류 (Multi-site based earthquake event classification using graph convolution networks)

  • 김관태;구본화;고한석
    • 한국음향학회지
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    • 제39권6호
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    • pp.615-621
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    • 2020
  • 본 논문은 다중 관측소에서 측정된 지진 신호를 이용한 그래프 합성곱 신경망 기반 지진 이벤트 분류 방법을 제안한다. 기존의 딥러닝 기반 지진 이벤트 분류 방법은 대부분 단일 관측소에서 측정된 신호로부터 지진 이벤트를 분류한다. 지진 관측망에는 수많은 지진 관측소가 존재하며 하나의 관측소만 사용하는 방법보다 여러 관측소의 정보를 동시에 활용하는 방법이 지진 이벤트 분류 성능 향상을 이끌 수 있다. 본 논문에서는 단일 관측소에서 측정된 지진 신호들에 합성곱 신경망을 적용해 임베딩 특징을 추출한 후 그래프 합성곱 신경망을 이용해 단일 관측소들 사이의 정보를 융합하는 다중 관측소 기반 지진 이벤트 분류 구조를 제안한다. 관측소의 개수 변화 등 다양한 실험을 통해 제안한 모델의 성능 검증을 수행하였으며 실험 결과 제안하는 모델이 단일 관측소 기반 분류 모델보다 약 10 % 이상의 정확도와 이벤트 재현율 성능 향상을 보여주었다.

구강암 수술 및 재건 환자에서의 C-Reactive Protein 수치의 변화 (C-Reactive Protein Changes in Oral Cancer Patients After Resection and Reconstructive Surgery)

  • 김철환;황승연
    • Maxillofacial Plastic and Reconstructive Surgery
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    • 제32권5호
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    • pp.422-430
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    • 2010
  • Purpose: The aim of this study is that we evaluate the change of the White Blood Cell(WBC) count, Absolute Neutrophil Count (ANC), Erythrocyte Sedimentation Rate (ESR) and C-reactive Protein (CRP) values, and try to make standardization for postoperative sequels before and after the oral cancer resection and reconstructive surgery. Materials and Methods: The study was comprised of 34 patients (male 15, female 19) who were diagnosed as an oral cancer and had performed ablation and reconstructive surgery at Dankook university dental hos-pital. Each blood specimen was collected from patients and estimated WBC count, Neutrophil count, ESR, CRP on first, third, fifth, seventh day efore and after surgery and analyzing inter relationship between each value. Classifying Group I (resection with reconstructive surgery patients) and Group II (resection without reconstructive surgery patients). Also classifying group A (below 4 hours of operation time), Group B (4 to 8 hours of operation time), Group C (above 8 hours of operation time), each group was analyzed and compared. The Following results were induced. Results: (1) In coefficient of correlation, the CRP and WBC has highest value except WBC count and Neutrophil count. (2) There was no significant difference any lapse in the progress between Group I and II of WBC count, Neutrophil count, but the CRP shows statistically higher level in group I than group II at immediate postoperative day, and 1 to 5 days after surgery. (3) There is no significant difference any lapse in the progress between Group A, B, C of WBC count, Neutrophil count, but CRP shows statistically significant difference in 1 day, 3 days after surgery Conclusion: It should be suggested that, determination of CRP is most valuable parameter for postopera-tive management and determination of postoperative clinical changes than other parameter such as WBC count, neutrophil count, and ESR values in oral cancer patient after resection and reconstructive surgery, based on the results of this study.

빔 쉐이핑된 펨토초 레이저를 이용한 터치스크린 패널의 ITO 박막 패터닝 (Patterning of ITO on Touch Screen Panels using a beam shaped femtosecond laser)

  • 김명주;김용현;윤지욱;최원석;조성학;최지연
    • 한국레이저가공학회지
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    • 제16권4호
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    • pp.1-6
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    • 2013
  • Femtosecond laser patterning of ITO on a touch screen panel with a shaped fs laser beam was investigated. A quasi flat-top beam was formed using a variable mask and a planoconvex lens. The spatial profile of the original Gaussian beam and the shaped beam were monitored by a CCD beam profiler. The laser patterned ITO film was examined using an optical microscope, Scanning Electron Microscope (SEM) with Energy Dispersive X-ray Spectroscopy (EDS), and Atomic Force Microscope (AFM). It turned out that the quality of the ITO pattern fabricated by a shaped beam is superior to that of the pattern without beam shaping in terms of debris generation, height of the craters, and homogeneity of the bottom. Optimum processing window was determined at the laser irradiance exhibiting 100% removal of Sn. The removal rate of In was measured to be 83%.

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Spinal Cord Stimulation in the Treatment of Postherpetic Neuralgia in Patients with Chronic Kidney Disease: A Case Series and Review of the Literature

  • Baek, In-Yeob;Park, Ju-Yeon;Kim, Hyae-Jin;Yoon, Ji-Uk;Byoen, Gyeong-Jo;Kim, Kyung-Hoon
    • The Korean Journal of Pain
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    • 제24권3호
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    • pp.154-157
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    • 2011
  • Background: Postherpetic neuralgia (PHN) is usually managed pharmacologically. It is not uncommon for patients with chronic kidney disease (CKD) to suffer from PHN. It is difficult to prescribe a sufficient dose of anticonvulsants for intractable pain because of the decreased glomerular filtration rate. If the neural blockade and pulsed radiofrequency ablation provide only short-term amelioration of pain, spinal cord stimulation (SCS) with a low level of evidence may be used only as a last resort. This study was done to evaluate the efficacy of spinal cord stimulation in the treatment of PHN in patients with CKD. Methods: PHN patients with CKD who needed hemo-dialysis who received insufficient relief of pain over a VAS of 8 regardless of the neuropathic medications were eligible for SCS trial. The follow-up period was at least 2 years after permanent implantation. Results: Eleven patients received percutaneous SCS test trial from Jan 2003 to Dec 2007. Four patients had successfully received a permanent SCS implant with their pain being tolerable at a VAS score of less than 3 along with small doses of neuropathic medications. Conclusions: SCS was helpful in managing tolerable pain levels in some PHN patients with CKD along with tolerable neuropathic medications for over 2 years.

리오셀 섬유의 가교 처리가 탄소 직물 특성에 미치는 영향 (Effect of Cross-linking Treatment of Lyocell Fabric on Carbon Fabric Properties)

  • 이수오;박길영;김우성;황태경;김연철;서상규;정용식
    • 한국추진공학회지
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    • 제23권6호
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    • pp.21-27
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    • 2019
  • 우주 항공용 노즐에 사용되는 셀룰로오스계 탄소 직물은 낮은 열전도도, 높은 내삭마 특성을 가지고 있다. 그러나 내염화 및 흑연화 공정에서 70~90% 중량이 감소하여 최종 탄소 직물 제조 시 수율이 낮은 단점이 있다. 본 연구에서는 리오셀 직물에 인계난연제로 인산(Phosphoric acid), 가교제로 시트르산(Citric acid)을 사용하여 전처리한 후 FT-IR, XRD, TGA 분석을 통하여 화학적 구조 및 열적 특성 변화를 확인하였다. 또한 리오셀 직물의 내염화 및 흑연화 후 중량을 측정하여 시트르산이리오셀 직물 수율 변화에 미치는 영향에 대하여 확인하였으며, 16 wt% 첨가 시 흑연화 수율이 8.1% 까지 증가하는 것을 확인하였다.

팥나방(Matsumuraeses phaseoli ) (나비목: 잎말이나방과)의 우화와 교미 행동 (Eclosion and Mating Behavior of Matsumuraeses phaseoli (Matsumura) (Lepidoptera: Tortricidae))

  • 조점래;정진교;양창열;서보윤;염기홍
    • 한국응용곤충학회지
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    • 제52권3호
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    • pp.249-253
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    • 2013
  • 팥나방(Matsumuraeses phaseoli, (Matsumura))은 팥의 꽃과 꼬투리를 가해하는 해충이다. 본 연구에서는 팥나방 성충 우화와 교미 시간대, 성충 나이 및 더듬이 제거가 교미에 미치는 영향을 조사하였다. 성충 우화는 16L:8D 광 조건에서 불이 켜지고 4시간 이내에 대부분 이뤄졌다. 대부분의 교미가 암 기간 동안 이뤄졌으나, 불이 켜진 직후에도 교미하는 개체들이 일부 관찰되었다. 우화 당일의 성충은 교미를 하지 않았으나 우화 후 4일된 성충의 교미율이 가장 높았다. 더듬이가 제거된 수컷 또는 암컷은 더듬이가 제거되지 않은 반대 성의 정상 성충과 교미를 하지 못하였다.