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시화호에서 하계 섬모충류의 초식압에 미치는 중형동물플랑크톤의 영향
홍현표,최중기,Hong, Hyun Pyo,Choi, Joong Ki 한국해양학회 2014 바다 Vol.19 No.4
시화호에서 식물플랑크톤 및 섬모충류의 포식자인 중형동물플랑크톤 개체수가 크게 증가하는 하계에 섬모충류의 초식압에 미치는 중형동물플랑크톤의 영향을 파악하기 위해 희석실험과 요각류 첨가 배양 실험을 병행하였다. 희석실험에서 섬모충류는 식물플랑크톤 생산량의 104%를 하루에 소비하였으나, 요각류 Acartia sinjiensis를 첨가한 실험구에서 섬모충류의 초식압은 19%로 크게 감소하였다. 이는 미소형식물플랑크톤의 주요 초식자인 $>20{\mu}m$ 빈섬모충류에 대한 중형동물플랑크톤의 선택적 섭이에 기인하는 것으로, 중형동물플랑크톤에 의해 섬모충류의 개체수가 강하게 지배되는 시기에는 섬모충류의 실제 초식압은 과대평가될 수 있음을 의미한다. 따라서 시화호에서 요각류 개체수가 크게 증가하는 춘계와 하계에는 식물플랑크톤의 초식자로서 섬모충류의 역할은 크게 감소될 것으로 판단되며, 초식자로서 섬모충류의 역할을 더 정확하게 평가하기 위해서는 섬모충류에 대한 중형동물플랑크톤의 포식압을 반드시 고려해야 할 것으로 보인다. We performed dilution experiments together with copepod added incubations to examine the influence of mesozooplankton on the grazing pressure of planktonic ciliates in Sihwa lake during summer when the abundances of phytoplankton and mesozooplankton increased considerably. Planktonic ciliates consumed 104% of primary production in a day on dilution experiments. However, the ciliates consumption on phytoplankton was reduced to 19% in copepod incubations with Acartia sinjiensis added. This was due to selective predation of A. sinjiensis on oligotrich ciliates ($>20{\mu}m$) which were major grazers on nano-phytoplankton. Our experiments show that grazing pressure of planktonic ciliates based on dilution experiments may be overestimated when the abundance of planktonic ciliates is strongly controlled by copepods. We postulate that the role of planktonic ciliates as grazers could diminish in Sihwa lake in spring and summer when abundance of copepods increase considerably. We suggest that the predation of mesozooplankton should be considered to better appraise the role of planktonic ciliates as grazers.
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중재적 복막투석 도관 설치술의 평가: 기술적 측면, 시술결과, 합병증$^1$
홍현표,오주형,윤엽,Hong, Hyeon-Pyo,O, Ju-Hyeong,Yun, Yeop 대한영상의학회 2003 대한영상의학회지 Vol.48 No.1
목적: 복막투석 도관의 설치 시 방사선 중재적 방법을 이용한 설치술의 시술 결과와 합병증을 알아보았다. 대상과 방법: 1999년 12월부터 2001년 4월까지 방사선 중재적 방법으로 복막투석 도관을 설치한 26명의 환자, 총 26개의 복막투석 도관을 대상으로 하였다. 남녀 비는 16:10, 나이는 30-77세(평균 55세)였다. 시술의 성공여부, 시술 중 합병증, 시술 이후 합병증을 조사하였으며, 평균 사용기간도 평가하였다. 결과: 대상환자 26명 모두 성공적으로 설치를 하였다. 1명의 환자에서 설치 중 하상복부동맥이 천자 되어 심한 국소 출혈이 있었으나 전기소작으로 치료되었으며, 설치 이상은 관찰되지 않았다. 복막투석 도관의 체내 잔류기간은 1-510일 이었으며 통계적 분석결과 도관의 평균 사용 기간은 416 $\pm$45일이었다. 추적 검사의 합병증 중, 4명에서 도관의 기능장애로 배액이 잘 안되었고, 이 중 2명은 혈관촬영실에서 위치를 교정하였으며, 그 중 1명은 urokinase를 사용하여 개통하였으며, 1명은 보존적 치료로 기능을 회복하였다. 3명의 환자에서 복막염이 발생하였으며, 2명은 항생제로 치료하였고, 1명은 도관을 제거하였다.4명의 환자에서 도관을 제거 하였으며, 그 원인은 기능장애 2예, 복막염 1예였고, 사망 1명이었다. 결론: 복막투석을 위한 도관의 방사선 중재적 방법을 이용한 설치술은 비교적 간편하며, 시술과 관련한 합병증을 줄이고 도관의 사용기간을 연장시킬 수 있다. Purpose: To evaluate the technical aspects, results and complications of the percutaneous radiologic placement of peritoneal dialysis catheters. Materials and Methods: Between December1999 and April 2001, 26 peritoneal dialysis catheters were placed percutaneously in 26 consecutive patients by interventional radiologists. The patient group consisted of 16 men and ten women with a mean age of 55 (range, 30-77) years. The results and complications arising were reviewed, and the expected patency of the catheters was determined by means of Kaplan-Meier survival analysis. Results: The technical success rate for catheter placement was 100% (26/26 patients). Severe local bleeding occurred in one patient due to by inferior epigastric artery puncture, and was treated by compression and electronic cautery. The duration of catheter implantation ranged from 1 to 510 days and the patency rate was 416 $\pm$45 days. Catheter malfunction occurred in four patients. In two, this was restored by manipulation in the intervention room, and in one, through the use of urokinase. In three patients, peritonitis occurred. Catheters were removed from four patients due to malfunction (n=2), peritonitis (n=1), and death (n=1). Conclusion: Percutaneous radiologic placement of a peritoneal dialysis catheter is a relatively simple procedure that reduces the complication rate and improves catheter patency.
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홍현표,서태석,차인호,유정림,목영재,오주형,권세환,김삼수,김승권 대한영상의학회 2013 Korean Journal of Radiology Vol.14 No.5
Objective: To evaluate the outcomes of patients undergoing percutaneous placements of a biliary stent for obstructive jaundice secondary to metastatic gastric cancer after gastrectomy. Materials and Methods: Fifty patients (mean age, 62.4 years; range, 27-86 years) who underwent percutaneous placements of a biliary stent for obstructive jaundice secondary to metastatic gastric cancer after gastrectomy were included. The technical success rate, clinical success rate, complication rate, stent patency, patient survival and factors associated with stent patency were being evaluated. Results: The median interval between the gastrectomy and stent placement was 23.1 months (range, 3.9-94.6 months). The 50 patients received a total of 65 stents without any major procedure-related complications. Technical success was achieved in all patients. The mean total serum bilirubin level, which had been 7.19 mg/dL ± 6.8 before stent insertion, decreased to 4.58 mg/dL ± 5.4 during the first week of follow-up (p < 0.001). Clinical success was achieved in 42 patients (84%). Percutaneous transhepatic biliary drainage catheters were removed from 45 patients (90%). Infectious complications were noted in two patients (4%), and stent malfunction occurred in seven patients (14%). The median stent patency was 233 ± 99 days, and the median patient survival was 179 ± 83 days. Total serum bilirubin level after stenting was an independent factor for stent patency (p = 0.009). Conclusion: Percutaneous transhepatic placement of a biliary stent for obstructive jaundice secondary to metastatic gastric cancer after gastrectomy is a technically feasible and clinically effective palliative procedure.
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홍현표,윤성원,박민준,정수찬 대한이비인후과학회 2014 대한이비인후과학회지 두경부외과학 Vol.57 No.1
Schwannoma is a benign tumor arising from the sheath of myelinated nerve fibers and may occur in any part of the body. However, a vidian nerve schwannoma is extremely rare. A 41 year-old man has experienced an occipital area headache and posterior neck stiffness for 2 weeks. Brain computed tomography (CT) angiography, magnetic resonance image revealed lobulated soft tissue density mass in left sphenoid sinus with upward displacement of sphenoid sinus floor and pressure erosion of sphenoid sinus and petrous apex. Ostiomeatal unit CT scan showed a 28×16 mm sized mass filling the left pterygoid canal. The mass was resected using endoscopic sinus surgery. The mass was confirmed as schwannoma. We report a case of vidian nerve schwan-noma that was treated by endoscopic sinus surgery. Korean J Otorhinolaryngol-Head Neck Surg 2014;57:50-3
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