Search

Brescia and Cimino et al. first described the creation of an arteriovenous fistula for hemodialysis access in 1966 [1]. Fifty years later, the National Kidney Foundation Dialysis Outcomes Quality Initiative (KDOQI) Guidelines continue to support radiocephalic arteriovenous fistula as the preferred initial vascular access [2]. Preference for a radiocephalic fistula is followed by brachiocephalic fistula, transposed brachiobasilic fistula, and lastly arteriovenous synthetic graft [2]. The overarching principal is to begin as distal as feasible and move proximally for future access procedures. The first description of a transposed upper arm brachiobasilic fistula was by Dagher et al. in 1976 [3]. Forearm cephalic or basilic vein transposition has also been described but is less commonly employed. If a forearm basilic or cephalic vein is of adequate size but anatomical constraints preclude a Cimino-type fistula, these distal transposition procedures allow for additional options. While more involved than a Cimino-type fistula, these forearm fistula options preserve upper arm veins for future procedures and may provide reliable dialysis access.

Surgeons increasingly encounter patients on clopidogrel therapy who are preparing to undergo surgery. The goal of this study was to examine the change in platelet function after the common clinical scenario of discontinuing chronic clopidogrel therapy in those patients preparing to undergo an elective surgery, and the time course of platelet function recovery after clopidogrel discontinuation. Patients on clopidogrel therapy scheduled for an elective surgical procedure had their platelet function tested using a Verify Now P2Y12 device (Accumetrics, San Diego, CA). Platelet inhibition was evaluated at baseline before clopidogrel discontinuation, and subsequently studied every other day in the week before their scheduled procedure. Mean platelet inhibition was 32.1 per cent on Day 0 (before clopidogrel discontinuation), decreasing to 3.7 per cent on Day 4. Platelet inhibition decreased significantly after discontinuation of clopidogrel in a time-dependent manner ( P = 0.011), although a considerable interindividual variability of P2Y12 reaction units values was observed over the study period. Patients on concomitant proton pump inhibitors and clopidogrel demonstrated a decreased effect of clopidogrel. In conclusion, individual platelet function monitoring may assist the surgeon in perioperative decision-making in patients receiving clopidogrel therapy preparing to undergo elective surgery.

Objective Hybrid thoracic endovascular aortic repair (TEVAR) has expanded the surgical management of complex thoracic aneurysms. Aortic arch debranching generally requires a sternotomy. We describe our experience performing a right anterior minithoracotomy for hybrid TEVAR. Method During a 3-year period, 7 patients (aged 76 ± 15 years; 57% were male) with aortic arch aneurysms underwent hybrid TEVAR via a right anterior minithoracotomy. Of all with prior thoracic or abdominal aortic surgery, 4 had a prior sternotomy. All patients included in this series had an American Society of Anesthesiology score of 4 or greater. Results Repairs were performed via a 5-cm incision at the third to fourth intercostal space to access the ascending arch. A Satinsky clamp on the ascending aorta facilitated bypass with the 10-mm arm of a bifurcated 10/12-mm graft to the innominate artery or right common carotid artery (12-mm arm: endoprosthesis conduit). The remaining arch vessels were bypassed as needed; subsequently, a thoracic stent graft was deployed by the 12- or 14-mm arm. Primary technical success was 86% (6 patients); 1 patient required conversion to sternotomy secondary to bleeding. Complications included cerebrovascular accident in 2 patients (28%) and respiratory failure in 2 patients (28%). The average length of stay was 12 days with no wound infection. One death occurred during the 30-day period. Conclusions Right anterior minithoracotomy is a compelling, less invasive technique for hybrid TEVAR. Further experience will be necessary to completely evaluate the merits of this approach.

Introduction La creation et la conservation de l’acces de dialyse chez les patients presentant une maladie occlusive veineuse centrale (MOVC) est un probleme complexe. L’approche et le processus decisionnel chirurgicaux demeurent mal definis. Nous avons evalue notre experience dans la prise en charge chirurgicale de la MOVC en rapport avec l’hemodialyse. La technique chirurgicale, les donnees demographiques, les complications, les reinterventions, les taux d’acces fonctionnels, et les facteurs influencant la morbidite et la mortalite ont ete examines. Methodes De janvier 2006 a mai 2010, nous avons realise un total de 1703 procedures d’acces de dialyse, 1021 fistules arterioveineuses (FAVs), 335 greffes arterioveineuses (GAVs), et 314 reprises d’acces comprenant des procedures de sauvetage endovasculaire. Dix-sept patients (10 femmes [58%] avec un âge moyen de 44 ± 27 ans) atteints de MOVC qui n’etaient pas indiques pour une greffe renale ou une dialyse peritoneale ont subi 20 procedures d’acces vasculaires complexes. Les indications etaient le besoin d’une creation d’acces dans 14 cas (70%) et une conservation dans les 6 autres (30%). Le polytetrafluoroethylene (PTFE) a ete employe pour tous les pontages chirurgicaux (PC). Tous les patients avaient precedemment subi de multiples procedures d’acces et avaient eu des echecs d’interventions percutanees pour MOVC. Resultats La planification chirurgicale consistait a trouver une sortie veineuse pour un acces arterioveineux (AV) ; les reconstructions veineuses centrales etaient necessaires dans 10 cas (50%) (7 [35%] sur le systeme veineux central thoracique et 3 [15%] sur des vaisseaux sous-diaphragmatiques) et un PC veineux extra-anatomique dans deux cas (10%). Les options d’acces non-veineux incluaient un PC arterio-arteriel axillaire parietal thoracique dans cinq cas (25%) et un PC de l’artere brachiale a l’oreillette droite dans trois (15%). Le succes technique etait obtenu dans tous les cas (100%). Le suivi moyen etait de 14,1 mois, les taux de permeabilite des acces AV ou par PC etaient de 66% a 6 mois et la duree globale de fonctionnement d’acces AV etait en moyenne de 9,2 mois. Parmi ces derniers, 85% des patients retournaient a domicile et 19 (95%) ont repris leurs activites habituelles. Un deces s’est produit par defaillance multi-organe au cours de la periode postoperatoire de 30 jours. Quatre patients supplementaires sont morts dans un delai de 3 ans apres la procedure, en raison de leurs comorbidites et sans lien avec la chirurgie. Conclusion Le recours a un acces vasculaires complexes augmentera avec le nombre de patients presentant une insuffisance renale terminale. La MOVC est un defi pour la chirurgie d’acces de dialyse et avec cet article nous proposons un algorithme de prise de decision.

Background Exhaustion of upper extremity dialysis access options is becoming more prevalent due to the longer survival of this patient population. In addition, central venous occlusive disease (CVOD) increases the risk of losing access viability in the ipsilateral extremity. Purpose We describe a novel technique of lower extremity arteriovenous graft (AVG) placement in which the external iliac artery and vein are utilized, as illustrated in 2 selected cases. Methods Two dialysis patients presented with exhausted upper extremity access options and bilateral intrathoracic CVOD. In patient 1, a venogram demonstrated complete occlusion of the left common iliac vein and severe stenosis of the right common femoral vein, rendering these unsuitable for access creation. In patient 2, with a history of peripheral arterial disease, an arteriogram revealed that the common and superficial femoral arteries were inadequate for access creation bilaterally. A retroperitoneal approach was utilized for a right external iliac artery and vein arteriovenous graft tunneled under the inguinal ligament to the anterior thigh. Results Adequate thrill and uneventful postoperative course were observed in both cases. At 10 months, patient 1 has done well on hemodialysis without the need for further intervention. Patient 2 has only recently had the procedure and is not yet using her graft. Conclusions As the number of patients requiring lower extremity vascular access increases, new surgical techniques will become available to handle the clinical and anatomic challenges encountered in this population.

To report robot-assisted stenting of a stenosis at the pulmonary artery anastomosis following lung transplantation, a rare complication that conveys poor prognosis even after surgical correction.The technique is illustrated in a 72-year-old man with end-stage lung disease who received a left single lung transplant. On postoperative day 54, he was evaluated for recurrent dyspnea on exertion that was due to a severe stenosis at the site of the pulmonary artery anastomosis. Balloon angioplasty was performed, and a 10-mm stent was deployed, with marked clinical improvement. Fourteen months later, he presented with recurrent symptoms due to in-stent restenosis. Multiple attempts at catheterization and balloon angioplasty of the stent failed. Due to the technical difficulty involved in maneuvering the balloon while maintaining stability, it was decided to repeat the angioplasty with the assistance of a Hansen Sensei remote robotic navigation system. The robotic arm markedly enhanced stability and facilitated successful navigation of the stented site. A 16-mm-diameter Wallstent was placed through the previously placed balloon-expandable stent and postdilated.A remote robotic catheter navigation system was able to assist stenting of an anastomotic pulmonary artery stenosis following failure of conventional interventional techniques.

ObjectiveTo examine contemporary operative techniques and outcomes for repair of isolated iliac artery aneurysms.MethodsWe retrospectively reviewed the charts of all patients who underwent repair of an isolated iliac artery aneurysm from February 1995 to June 2007. Mycotic aneurysms and patients with concurrent infrarenal abdominal aortic aneurysms greater than 3.5 cm in diameter were excluded from analysis. Patients with prior abdominal aortic aneurysm repair were not excluded.ResultsFifty-six patients (96% male; mean age, 72 ± 10 years) had either open (n = 24) or endovascular (n = 32) repair with median follow-up of 36 months. Seven patients were treated for rupture, six with open repair, and one with an endograft. Average aneurysm size for patients in the open and endovascular repair cohorts was 4.5 ± 2.4 cm and 4.0 ± 1.1 cm, respectively (P = .35). One episode of endograft limb thrombosis at five months was treated with catheter-directed thrombolytic therapy and stent placement. Thirty-day mortality for patients undergoing elective and emergent open repair was 1/18 (6%) and 1/6 (17%), respectively. There was no 30-day mortality for the endovascular group. Median length of stay was 10.5 days in the open group and one day in the endovascular elective group (P < .01). There was no mid-term aneurysm-related mortality in either group. Primary patency rates were similar between the open and endovascular groups at five years (100% vs. 96%, P = .07). Aneurysm sac diameter decreased in 67% (21/28) of patients that underwent endovascular repair. One patient with a Type III endoleak required relining of the endograft with a second endograft at 72 months.ConclusionThese data demonstrate that in appropriately selected patients, endovascular repair of isolated iliac artery aneurysms is a safe, effective alternative to open repair with mid-term follow-up. Endovascular repair is associated with a significantly reduced hospital length of stay and may be associated with decreased need for transfusion and mortality when compared with open repair.

Adult paratesticular rhabdomyosarcoma (PRMS) with invasion of the retroperitoneum and involvement of the infrarenal aorta and inferior vena cava (IVC) is rare. We describe a 23-year-old male diagnosed with PRMS in 2008, previously treated with right orchiectomy, chemotherapy, and radiation, who presented with new onset of lower back pain. Computed tomography (CT) scan revealed a 4.8 × 4.2 cm mass involving both the infrarenal aorta and the IVC. We resected the tumor en bloc with in situ reconstruction of the aorta utilizing a Dacron graft and the IVC with a bovine pericardium roll graft. His postoperative period was uneventful, and he was discharged on postoperative day 6 in stable condition. At 2-month follow-up, the patient recovered well from the surgery, patent grafts on CT scan with no clinical signs of lower extremity ischemia or edema, and he continues to receive cycles of chemotherapy.

Background Creation and preservation of dialysis access in patients with central venous occlusive disease (CVOD) is a complex problem. The surgical approach and decision-making process remains poorly defined. We evaluated our experience in the surgical management of hemodialysis-related CVOD. Surgical technique, demographics, complications, reinterventions, access function rates, and factors influencing morbidity and mortality were examined. Methods From January 2006 to May 2010, we performed a total of 1,703 dialysis access-related procedures, 1,021 arteriovenous fistulas (AVFs), 335 arteriovenous grafts (AVGs), and 314 access revisions including endovascular salvage procedures. Seventeen patients (10 women [58%] with a mean age of 44 ± 27 years) with CVOD who were not suitable for peritoneal dialysis or kidney transplant underwent 20 complex vascular access procedures. The indications were need for access creation in 14 cases (70%) and preservation in the remaining 6 (30%). Polytetrafluoroethylene (PTFE) was used for all surgical bypass grafts (BPG). All patients had previously undergone multiple access surgeries and had failed percutaneous interventions for CVOD. Results The surgical planning centered on finding venous outflow for an arteriovenous (AV) access; central venous reconstructions were necessary in 10 (50%) cases (seven [35%] in the thoracic central venous system and three [15%] in infradiaphragmatic vessels) and extracavitary venous BPG in two (10%) cases. Non-venous access options included axillary arterial-arterial chest wall BPG in five (25%) cases and brachial artery to right atrium BPG in three (15%). Technical success was achieved in all cases (100%). Mean follow-up was 14.1 months, both BPG and AV access patency rates were 66% at 6 months and overall average AV access function time was 9.2 months. Of these, 85% of patients were discharged home and following 19 (95%) cases they returned or improved their baseline functional status. One death occurred from multiorgan failure during the 30-day postoperative period. Four additional patients died within 3 years of the procedure secondary to nonsurgical-related comorbidities. Conclusion The need for complex vascular accesses will continue as the number of patients with end-stage renal disease increases. CVOD is an access surgical challenge and with this article we propose a decision-making algorithm.

Patients undergoing hemodialysis are known to develop central venous occlusion and exhaust all options for vascular access to upper extremity sites; therefore, creating and maintaining vascular access is paramount in such patients. The present case report describes the condition of a 34-year-old woman with failed upper extremity access, frequent catheter-related issues, and multiple central venous occlusions. As a last resort, access to the lower extremity was pursued as follows: an inferior vena cava bypass was combined with a right femoral transposition fistula and a distal revascularization interval ligation procedure. This complex procedure that was carried out for the purpose of vascular access is a unique, albeit aggressive, surgical solution that resulted in autologous vascular access with a 6-month patency and also served to improve the quality of life in the seemingly hopeless case.

Les patients en hemodialyse sont connus pour developper des occlusions veineuses centrales et pour epuiser toutes les options d’acces vasculaire au niveau du membre superieur ; la creation et le maintien d’un acces vasculaire sont essentiels chez ces patients. Le present rapport de cas concerne une femme de 34 ans avec echec d’un acces au membre superieur, de problemes de catheterisme, et des occlusions veineuses centrales multiples. En dernier recours, un acces au membre inferieur a ete cree comme suit : un pontage cave inferieur a ete associe a une fistule par transposition femorale droite et une procedure de revascularisation distale avec ligature intermediaire. Ce procede complexe utilise pour creer un acces vasculaire est une solution chirurgicale originale, quoiqu’agressive, qui a permis un acces vasculaire autologue avec une permeabilite a six mois et une amelioration de la qualite de vie dans ce cas apparemment desespere.

A 58-year-old man presented with recurrent esophageal adenocarcinoma abutting the descending thoracic aorta. He had undergone partial esophagectomy 2 years previously, followed by chemotherapy and radiation. A recent esophagoscopy and biopsy indicated local recurrence. A second round of chemotherapy and concomitant esophageal stent placement was undertaken before presenting for resection of his mass and completion esophagectomy. Given the proximity of the tumor to the thoracic aorta, the previous radiation therapy, and the nature of a redo field in the chest, a thoracic endograft was placed under Dyna and fluoro computed tomography (CT) to facilitate the esophagectomy by preventing aortic interruption/rupture during the thoracic dissection (Cover). The images were acquired by the Siemens Artis Zeego Dyna-CT Rotational Angiography system at our Hybrid Operating Room and reconstructed at our syngo XWP (Siemens AG, Forchheim, Germany) clinical workstation. This Dyna-CT image after thoracic endovascular aneurysm repair placement demonstrates both the thoracic and esophageal stents in place. Dyna-CT with adequate postimaging 3D software can provide on-table information regarding aortic anatomy, including curvature, angulation, conicity, intramural thrombus, diameters, center-line lengths, landing zones, spinal/lumbar arteries and large collaterals; all with one modality. Upgrades in fixed C-arm imaging have facilitated wider fields of view. Furthermore, integrated Dyna-CT images can be overlaid to in vivo arteriography during thoracic endovascular aneurysm repair placement. The use of Dyna-CT allowed precise avoidance of the left subclavian artery and the distal accessory spinal artery supplying watershed areas of the spinal cord (Artery of Adamkiewicz). The patient safely tolerated his completion esophagectomy and resection of mediastinal mass without risk to his descending thoracic aorta. The use of Dyna-CT confirms prior esophageal and cardiac modeling to provide highly accurate and precise imaging over multislice CT alone.

Plant Factories with Artificial Lighting (PFALs) are spreading due to the claimed efficiency in natural resources use, although at the cost of higher energy needs as compared with more traditional food systems. In recent years, research literature on PFAL technological features and management protocols has bloomed, mainly targeting innovation in lighting technologies, growing systems and environmental control units. To date, however, a comprehensive analysis of resource use and environmental impacts associated with PFAL systems is lacking. The present review paper aims at providing valuable insights on PFAL sustainability and compare their applications against current technologies and food systems with a special focus on resource use efficiency.