• Journal of Chest Surgery
• /
• 제51권6호
• /
• pp.406-409
• /
• 2018

Aortocaval fistula (ACF) occurs in <1% of all abdominal aortic aneurysms (AAAs), and in 3% to 7% of all ruptured AAAs. The triad of clinical findings of AAA with ACF are abdominal pain, abdominal machinery bruit, and a pulsating abdominal mass. Other findings include pelvic venous hypertension (hematuria, oliguria, scrotal edema), lower-limb edema with or without arterial insufficiency or venous thrombus, shock, congestive heart failure, and cardiac arrest. Surgery is the main treatment modality. We report successful surgical treatment in a patient with a ruptured AAA with ACF who presented with cardiogenic shock.

• 대한기계학회논문집B
• /
• 제37권11호
• /
• pp.985-990
• /
• 2013

신부전 환자의 신장기능을 유지하는 방법의 일환으로서 사용되는 혈액 투석 시 동정맥루 문합각도에 따라서 혈액 유동상태의 양호가 결정된다. 지금까지의 연구는 CFD에 의한 것이 대부분이었으나 실험적 보고는 없다. 본 연구에서는 동정맥루의 혈류역학적 특성을 분석하기 위하여 PIV기법을 이용하였다. PIV실험을 위한 혈관모델의 문합부 각도는 $30^{\circ}C$로 정하였다. 유체역학적 상사를 만족시키기 위하여 Re수는 같게 하였고, 동맥부분에 밸브를 달아 개폐 정도를 조절하면서 PIV실험을 수행하였다. PIV 실험결과 분지부 부분에서 재순환유동이 발생되는 것을 볼 수 있었고, 동맥의 개폐 정도에 따라 전체적인 혈류속도의 변화가 나타났다.

• Journal of Chest Surgery
• /
• 제53권5호
• /
• pp.297-300
• /
• 2020

Background: This study aimed to assess the effect of vessel size and flow characteristics on the maturation of autogenous radiocephalic arteriovenous fistulae (RCAVFs). Methods: We retrospectively reviewed records of patients undergoing RCAVF creation at a single medical center from January 2013 to December 2019. Operative variables were compared between patients whose fistulae matured and those whose fistulae failed to mature. Results: Overall, 152 patients (33 of whom were women) with a mean age of 62.6±13.6 years underwent RCAVF creation; functional maturation was achieved in 123. No statistically significant differences were observed between patients in whom maturation was or was not achieved in terms of the following variables: female sex (20.3% vs. 25.0%), radial artery size (2.5 vs. 2.4 mm), and pulsatility index (0.69 vs. 0.62). Low intraoperative transit time flowmetry (TTF; 150.4 vs. 98.1 mL/min) and small vein size (2.4 vs. 2.0 mm) were associated with failure of maturation. The best cutoff diameter for RCAVF TTF and cephalic vein size were 105 mL/min and 2.45 mm, respectively. Conclusion: In patients who undergo RCAVF creation, vein diameter on preoperative ultrasonography and intraoperative TTF are predictors of functional maturation. We identified an intraoperative TTF cutoff value that can be used for intraoperative decision-making.

• 임상간호연구
• /
• 제21권2호
• /
• pp.215-222
• /
• 2015

Purpose: For hemodialysis, a vascular access which can maintain a certain speed for a long time is required. The prevention of the vascular access dysfunction is very important to decrease morbidity and to improvethe quality of life of patients receiving hemodialysis It is reported that far infrared heat increases the blood flow by expanding capillaries and micro-arteriovenouses. This study aimed to evaluate the effect of far infrared heat therapy as a new nursing intervention for maintaining vascular access function and improving the blood flow of patients receiving hemodialysis. Methods: The quasi-experimental research of nonequivalent control group pre-post test design was carried out for 59 patients receiving hemodialysis 3 times per week at K medical center. A far infrared heat was applied to the experimental group for 3 months. Results: The arteriovenous fistula blood flow of the experimental group (far infrared heat therapy group) increased significantly when compared to the control group (p=.047). However, static intra-access pressure ratio(SIAPR)was not different statistically (p=.101). Conclusion: The far infrared therapy could be considered as nursing intervention of choice as it demonstrated increase in the arteriovenous fistula blood flow in the patients receiving hemodialysis.

• Journal of Chest Surgery
• /
• 제43권5호
• /
• pp.534-537
• /
• 2010

5세 때에 교통사고 후 지혈목적으로 대퇴정맥 결찰을 받은 26세 남자 환자가 입원 5일 전 축구하다 생긴 좌측 하지의 정맥궤양에서 나타난 출혈을 주소로 입원하였다. 환자는 좌측 하지에 하지 정맥류의 발생과 정체성 피부염과 정맥 궤양이 있었다. 좌측 대퇴정맥 혈류를 우측 대퇴정맥으로 환류시키려고 우측 대복재정맥을 이용하여 동정맥루가 있는 우회로 조성술을 시행하였다. 우회로의 원활한 개통을 위해 만든 동정맥루는 처음 수술 6주 후에 폐쇄하였다. 환자는 수술 후 6개월 간 좌측 하지 둘레가 비교적 일정하게 유지되고 있다. 이와 같이 만성 대퇴정맥 결찰 환자에 대한 정맥 crossover 우회로 조성술 1예를 치험하였기에 보고하는 바이다.

• Journal of Chest Surgery
• /
• 제29권8호
• /
• pp.883-888
• /
• 1996

Expanded polytetrafluoroethyene(expanded PTFE) 인조혈관을 이용한 동정 맥루조성술은 장기간의 혈액투석을 시행받는 환자들의 이차적인 동정 맥루조성술로서 많이 이용되고 있는 방법이다. 충남대학교병원 흉부외과에서는 1990년 8월부터 1995년 8월까지 35명의 환자에서 48례의 expanded PTFE인조혈관을 이용한 동정 맥루조성술을 시행하였고, 이중 32명의 환자 43례 에서 1개월에서 46개월 까지 추적관찰하였다. 저자들은 forearm에 36례의 수술을 시행하였고 upperarm에는 7례의 수술을 시행하였다. 수술실패가 3례, 조기 및 만기 합병증이 22례였었다(15례의 인조혈관 혈전, 기타 7례). 전체 동정맥루의 누적개존율은 12개월이 63%, 24개월 32%, 36개월 32%, 46개월이 21%였다. Fore- arm graft의 누적개존율은 12개월이 55%, 24개월이 30%, 36개월이 30%, 46개월이 20%이었으며 upperarm graft의 누적 개존율은 12개 월이 83%, 24개 월이 41%, 29개 월이 41 %였다. 위의 결과를 볼때, 이차적인 동정 맥루술로서의 expanded PTFE graft는 아직 자가정맥에 의한 동정맥루술보다 개존율이 낮고많은 합병증을 갖고 있지만, 개존율을 높이기 위해서는 더 좋은 梔行仄袖\ulcorner개발과 술후 관심 있는 관찰 및 기능을 유지하기 위한 관심이 필요하다고 생각된다.

• Journal of Chest Surgery
• /
• 제45권5호
• /
• pp.326-329
• /
• 2012

Pulmonary arteriovenous malformation (PAVM) is a rare anomalous direct communication between the pulmonary artery and vein with a considerable risk of serious complications such as cerebral thromboembolism or abscess and pulmonary hemorrhage. Although the past, surgical resection such as lobectomy was mostly used to treat PAVM, the recent development of endovascular treatment has made it a primary consideration to perform transcatheter embolization using coils or detachable balloons. We report a case of successful transcatheter embolization of giant PAVM with the second generation Amplatzer vascular plug II as a new self-expanding device.

• Journal of Chest Surgery
• /
• 제48권2호
• /
• pp.120-125
• /
• 2015

Background: The purpose of this study was to evaluate the use of a Fogarty arterial embolectomy catheter (Fogarty catheter) in intraoperative balloon angioplasty of the cephalic vein, in order to determine its effect on the patency of arteriovenous fistulas (AVFs) created for hemodialysis access. Methods: A total of 156 patients who underwent creation of an AVF were divided into two groups, based whether a Fogarty catheter was used during AVF creation. Group A (89 patients) comprised the patients who underwent balloon angioplasty with a Fogarty catheter during the operation. Group B (67 patients) included the patients in whom a Fogarty catheter was not used during the operation. Patient records were reviewed retrospectively and documented. The patency rate was determined by the Kaplan-Meier method. Results: The records of 156 patients who underwent the creation of an AVF from January 2007 to October 2011 were included. The mean follow-up duration was $40.2{\pm}19.4$ months (range, 1 to 97 months). The patency rates in group A at 12, 36, and 72 months were $83.9%{\pm}3.9%$, $78.3%{\pm}4.6%$, and $76.3%{\pm}4.9%$, respectively, while the corresponding patency rates in group B were $92.5%{\pm}3.2%$, $82.8%{\pm}0.5%$, and $79.9%{\pm}5.7%$, respectively. The patency rates in group B were found to be slightly higher than those in group A, but the difference was not statistically significant (p=0.356). Conclusion: Intraoperative balloon angioplasty of the cephalic vein using the Fogarty catheter is a simple and easily reproducible procedure, and it can be helpful in increasing AVF patency in cases of insufficient runoff or a suboptimal cephalic vein.

• 대한영상의학회지
• /
• 제83권3호
• /
• pp.658-668
• /
• 2022

목적 혈액투석경로의 기능부전에 대한 인터벤션 치료 시 경요골 동맥 접근법의 유용성을 연구하고자 한다. 대상과 방법 2008년 1월부터 2019년 4월까지 73명의 환자에서(남성 43명, 여성 30명, 평균 연령 67.4세; 범위 42-92세) 경요골 동맥 접근법을 이용한 시술을 시행한 환자들에 대해 후향적 연구를 시행하였다. 환자들의 기본적인 특성과 병변의 특성, 경요골 동맥 접근을 통한 인터벤션 시술의 기술적 및 임상적 성공률, 시술과 연관된 합병증에 대해 조사하였고 장기 개통성에 대해서는 카플란-마이어 방법을 이용하여 분석하였다. 결과 모든 환자에서 요골 동맥을 통한 혈관조영술을 성공적으로 시행하였고, 기술적 성공률은 98.6%(72/73), 임상적 성공률은 91.7%(67/73)였다. 일차적 개통률의 중앙값은 18.8 ± 15.9개월이었고, 3, 6, 12개월 누적 개통률은 각각 82.1%, 68.6%, 그리고 63.9%였다. 모든 환자에서 손의 허혈과 같은 주요한 합병증은 발생하지 않았으며 경요골 동맥 천자와 연관한 즉각적인 합병증 또한 발생하지 않았다. 결론 혈액투석경로 기능 부전 환자에서 경요골 동맥 접근법을 통한 인터벤션 시술은 안전하고 임상적으로 유용한 방법으로 생각된다. 또한 선별된 환자에서 전통적인 경정맥 접근법에 대해 대안으로 기능할 수 있을 것으로 생각된다.

• Korean Journal of Radiology
• /
• 제23권10호
• /
• pp.949-958
• /
• 2022

Objective: To investigate the feasibility of using a deep learning-based analysis of auscultation data to predict significant stenosis of arteriovenous fistulas (AVF) in patients undergoing hemodialysis requiring percutaneous transluminal angioplasty (PTA). Materials and Methods: Forty patients (24 male and 16 female; median age, 62.5 years) with dysfunctional native AVF were prospectively recruited. Digital sounds from the AVF shunt were recorded using a wireless electronic stethoscope before (pre-PTA) and after PTA (post-PTA), and the audio files were subsequently converted to mel spectrograms, which were used to construct various deep convolutional neural network (DCNN) models (DenseNet201, EfficientNetB5, and ResNet50). The performance of these models for diagnosing ≥ 50% AVF stenosis was assessed and compared. The ground truth for the presence of ≥ 50% AVF stenosis was obtained using digital subtraction angiography. Gradient-weighted class activation mapping (Grad-CAM) was used to produce visual explanations for DCNN model decisions. Results: Eighty audio files were obtained from the 40 recruited patients and pooled for the study. Mel spectrograms of "pre-PTA" shunt sounds showed patterns corresponding to abnormal high-pitched bruits with systolic accentuation observed in patients with stenotic AVF. The ResNet50 and EfficientNetB5 models yielded an area under the receiver operating characteristic curve of 0.99 and 0.98, respectively, at optimized epochs for predicting ≥ 50% AVF stenosis. However, Grad-CAM heatmaps revealed that only ResNet50 highlighted areas relevant to AVF stenosis in the mel spectrogram. Conclusion: Mel spectrogram-based DCNN models, particularly ResNet50, successfully predicted the presence of significant AVF stenosis requiring PTA in this feasibility study and may potentially be used in AVF surveillance.