Vascular Reconstructive Procedures Research Articles

Acute ischaemia of the lower limb: the effect of centralizing vascular surgical services on morbidity and mortality.

Surgical audit data for two 5-year periods (1974-78 and 1983-87) have been compared in a Health Board Area to assess the impact of centralization of emergency vascular services on the treatment of the acutely ischaemic lower limb. Patient populations in each period were comparable. Mortality rates remained constant in both periods at approximately 30 per cent. A significant improvement in overall limb salvage was observed (from 54 to 67 per cent, P less than 0.05). Limb salvage in survivors was improved from 80 to 95 per cent (P less than 0.001) and was paralleled by an increase in the number of reconstructive vascular procedures performed. We concluded that the centralization of emergency vascular services has not led to a reduced risk of mortality but has been associated with improved limb salvage.

Cytoreductive surgery in disseminated non-seminomatous germ cell tumours of testis

Between 1977 and 1988, 67 patients underwent surgical removal of residual metastatic deposits following an aggressive chemotherapy regimen (cisplatin, vincristine, methotrexate and bleomycin alternating with etoposide, actinomycin D and cyclophosphamide) for disseminated germ cell tumours of the testis (stage IIB or above). Ninety-one surgical procedures were performed. There were 63 (69 per cent) retroperitoneal lymph node dissections, 16 (18 per cent) thoracotomies, three (3 per cent) hepatic resections, three (3 per cent) craniotomies, five (5 per cent) delayed orchidectomies and one anterolateral decompression of the vertebral column. Nine (13 per cent) patients required a repeat retroperitoneal node dissection and one patient needed a repeat thoracotomy to remove recurrent metastatic deposits during the period of follow-up. Multivisceral resections and vascular reconstruction procedures were required in 20 (30 per cent) patients undergoing retroperitoneal node dissection. Fifty-five (82 per cent) patients remain in complete remission with a mean follow-up period of 49.6 months (range 2-121 months). Nine (13 per cent) patients died with metastatic disease between 2 months to 4 years after operation. There were three deaths in the perioperative period (4 per cent). The histology of the resected metastases revealed undifferentiated active tumour in 20 (30 per cent) patients, differentiated mature teratoma in 29 (43 per cent) patients and fibrosis/necrosis in 18 (27 per cent) patients. Twelve (60 per cent) patients with undifferentiated elements and 15 patients (60 per cent) with raised preoperative tumour markers (poor prognostic categories) are in complete remission. Cytoreductive surgery in patients with metastatic germ cell tumours offers the best chance of remission following chemotherapy even in poor prognostic group categories.

Tissue Engineering of Recellularized Small-Diameter Vascular Grafts

A tissue-engineered small-diameter arterial graft would be of benefit to patients requiring vascular reconstructive procedures. Our objective was to produce a tissue-engineered vascular graft with a high patency rate that could withstand arterial pressures. Rat arteries were acellularized with a series of detergent solutions, recellularized by incubation with a primary culture of endothelial cells, and implanted as interposition grafts in the common femoral artery. Acellular grafts that had not been recellularized were implanted in a separate group of control animals. No systemic anticoagulants were administered. Grafts were explanted at 4 weeks for definitive patency evaluation and histologic examination; 89% of the recellularized grafts and 29% of the control grafts remained patent. Elastin staining demonstrated the preservation of elastic fibers within the media of the acellular grafts before implantation. Immunohistochemical staining of explanted grafts demonstrated a complete layer of endothelial cells on the lumenal surface in grafts that remained patent. Smooth muscle cells were observed to have repopulated the vessel walls. The mechanical properties of the matrix were comparable to native vessels. Such a strategy may present an alternative to autologous harvest of small vessels for use in vascular bypass procedures.

Takayasu’s aortoarteritis

Surgical treatment of two female patients aged 32 and 41 years, with neurological problems causes by type I Takayasu's aortoarteritis, are presented here. Both of them were treated with by pass from ascending aorta to left common carotid and left subclavian arteries, using transsternal approach. During the follow up period (3.5 years for the first, and 2 years for the second patient) both patients were free of neurologic symptoms. Corticosteroid therapy was given to the first patient for controlling of active diseases, immediatelly after the operation and during the first three postoperative months. By this reason an infection af the proximal part of sternal wound was developed. MRI showed involvement of the vascular graft. Due to high risk of reoperation, medical treatment was performed. Takayasu's aortoarteritis is very unsommon in our country, as well as in other countries which don't belong to Far East. In cases with hemodinamic important arterial lesions produced disabling symptoms, a standard PTA and reconstructive vascular procedures are indicated. Takayasu's aortoarteritis is a complex disease. It requires combined dignostic and therapeutic approaches which produce satisffied long-term results.

Anastomotic False Aneurysm: Case Report and Review of Literature

Background: Anastomotic false aneurysm is rare in Nigeria although it is the commonest cause of false aneurysm presently in developed countries. Method: A case is presented and the aetiopathogenesis is reviewed. The treatment modalities are highlighted. Conclusion:With increasing vascular reconstructive procedures, this type of false aneurysm will become common in our environment. It is therefore pertinent that this lesion is readily recognized so that appropriate treatment is given. Key Words: Anastomotic false aneurysm, Nigeria , Prostheses, Suture. Journal of College of Medicine 2005: 9(2): 101-103

Antithrombotic Therapy in Peripheral Arterial Occlusive Disease: The Seventh ACCP Conference on Antithrombotic and Thrombolytic Therapy

This chapter about antithrombotic therapy for peripheral arterial occlusive disease is part of the seventh ACCP Conference on Antithrombotic and Thrombolytic Therapy: Evidence Based Guidelines. Grade 1 recommendations are strong and indicate that the benefits do, or do not, outweigh risks, burden, and costs, and Grade 2 suggests that individual patients' values may lead to different choices (for a full understanding of the grading see Guyatt et al, CHEST 2004;126:179S-187S). Among the key recommendations in this chapter are the following: For patients with chronic limb ischemia, we recommend lifelong aspirin therapy in comparison to no antiplatelet therapy in patients with clinically manifest coronary or cerebrovascular disease (Grade 1A) and in those without clinically manifest coronary or cerebrovascular disease (Grade 1C+). We recommend clopidogrel over no antiplatelet therapy (Grade 1C+) but suggest that aspirin be used instead of clopidogrel (Grade 2A). For patients with disabling intermittent claudication who do not respond to conservative measures and who are not candidates for surgical or catheter-based intervention, we suggest cilostazol (Grade 2A). We suggest that clinicians not use cilostazol in patients with less-disabling claudication (Grade 2A). In these patients, we recommend against the use of pentoxifylline (Grade 1B). We suggest clinicians not use prostaglandins (Grade 2B). In patients with intermittent claudication, we recommend against the use of anticoagulants (Grade 1A). In patients with acute arterial emboli or thrombosis, we recommend treatment with immediate systemic anticoagulation with unfractionated heparin (UFH) [Grade 1C]. We also recommend systemic anticoagulation with UFH followed by long-term vitamin K antagonist (VKA) in patients with embolism [Grade 1C]). For patients undergoing major vascular reconstructive procedures, we recommend UFH at the time of application of vascular cross-clamps (Grade 1A). In patients undergoing prosthetic infrainguinal bypass, we recommend aspirin (Grade 1A). In patients undergoing infrainguinal femoropopliteal or distal vein bypass, we suggest that clinicians do not routinely use a VKA (Grade 2A). For routine patients undergoing infrainguinal bypass without special risk factors for occlusion, we recommend against VKA plus aspirin (Grade 1A). For those at high risk of bypass occlusion and limb loss, we suggest VKA plus aspirin (Grade 2B). In patients undergoing carotid endarterectomy, we recommend aspirin preoperatively and continued indefinitely (Grade 1A). In nonoperative patients with asymptomatic or recurrent carotid stenosis, we recommend lifelong aspirin (Grade 1C+). For all patients undergoing extremity balloon angioplasty, we recommend long-term aspirin (Grade 1C+).

Long-term results after repair of ruptured and non-ruptured abdominal aortic aneurysm

Abdominal aortic aneurysm can be repaired by elective procedure while asymptomatic, or immediately when it is complicated--mostly due to rupture. Treating abdominal aneurysm electively, before it becomes urgent, has medical and economical reason. Today, the first month mortality after elective operations of the abdominal aorta aneurysm is less than 3%; on the other hand, significant mortality (25%-70%) has been recorded in patients operated immediately because of rupture of the abdominal aneurysm. In addition, the costs of elective surgical treatment are significantly lower. The objective of this study is to compare long-term survival of patients that underwent elective or immediate repair of abdominal aortic aneurysm (due to rupture), and to find out the factors influencing the long-term survival of these patients. Through retrospective review of prospectively collected data of the Institute for Cardiovascular Diseases of Clinical Center of Serbia, Belgrade, 56 patients that had elective surgery and 35 patients that underwent urgent operation due to rupture of abdominal aneurysm were followed up. Only the patients that survived 30 postoperative days were included in this review, and-were followed up (ranging from 2 to 126 months). Electively operated patients were followed during 58.82 months on the average (range 7 to 122), and urgently operated were followed over 52.26 months (range 2 to 126). There was no significant difference of the length of postoperative follow-up between these two groups. During this period, out of electively operated and immediately operated patients, 27 and 22 cases died, respectively. There was no significant difference (p>0.05a) of long-term survival between these two groups. Obesity and early postoperative complications significantly decreased long-term survival of both electively and immediately operated patients. Graft infection, ventral hernia, aneurysm of peripheral arteries and other vascular reconstructive procedures were the factors that significantly reduced long-term survival of patients operated immediately due to rupture. This comprehensive study has searched for more factors than others had done before. The applied discriminative analysis numerically evaluated the influence of any risk factor of mortality. These factors were divided in three groups as follows: preoperative, operative and postoperative ones. Preoperative factors were sex, age, diabetes mellitus, arterial hypertension, obesity, COPD, and naturally, the indication for operative treatment of ruptured or non-ruptured abdominal aneurysm. Among all these factors, only obesity significantly reduced long-term survival of electively operated patients. It may be said that immediately operated patients who survived the first 30 postoperative days had quite good long-term survival. Operative factors such as type of operative procedure and vascular graft had no influence on long-term survival of patients in both groups. Postoperative risk factors were early postoperative complications, graft infection, symptomatic cerebrovascular disease, carotid endarterectomy, myocardial revascularization, ventral hernias, "other" non vascular operations, malignancy, mental disorders, peripheral aneurysms and occlusive vascular disease, and other vascular operations either due to aneurysm or peripheral occlusive disease. Early postoperative complications (even graft infection) had no significant effect on long-term survival. Ventral hernias and peripheral aneurysms were factors that significantly decreased long-term survival of patients operated for rupture of the abdominal aneurysm. It is interesting that endarterectomy, myocardial revascularization or malignancy after repair of the abdominal aneurysm (ruptured or non-ruptured) had no effect on long-term survival.

Therapeutic angiogenesis with vascular endothelial growth factor in peripheral and coronary artery disease: a review.

Therapeutic angiogenesis constitutes an alternative treatment for patients with extensive tissue ischaemia in whom primary vascular reconstruction procedures are not feasible or have previously failed. At present vascular endothelial growth factor (VEGF) has been the most widely used angiogenic factor in experimental and human clinical trials. Early clinical data provide evidence that gene transfer of the VEGF gene can achieve beneficial angiogenesis, with minimal side-effects. Ongoing phase III clinical studies will reveal definitive efficacy.

Concomitant vascular procedures for malignancies with vascular invasion.

Contemporary reconstructive vascular techniques can be safely used to permit resection of tumors invading major vascular structures. Review of vascular surgery registry between January 1, 1987, and December 31, 2001. An academic medical center and affiliated institutions. Forty-nine patients (37 males and 12 females) aged 15 through 80 years (mean age, 55 years) who required concomitant vascular resection and reconstruction to allow complete tumor resection. Early (<30 days) morbidity and mortality, late (>30 days) vascular morbidity and mortality, primary patency of the vascular reconstruction, and tumor-free survival. Aortic resection with graft reconstruction was performed in 20 patients (41.7%) and inferior vena cava resection with reconstruction in 6 patients (12.5%). Five patients (10.4%) had both the aorta and inferior vena cava resected and reconstructed. Iliac, femoral, or popliteal reconstructions were performed in 15 patients (31.3%). Portal vein reconstruction was performed to permit resection of pancreatic neoplasms in 8 patients (16.7%). Resection and reconstruction of either a brachiocephalic vessel or superior vena cava was performed in 4 patients. Thirty-day mortality was 2.1%, as 1 patient died of a myocardial infarction following tumor resection with vascular reconstruction. Overall 30-day morbidity was 12.2%. Early vascular morbidity included bleeding from an arterial anastomosis and a compartment syndrome requiring fasciotomy. Primary patency of the vascular reconstructions at 24 months was 90% and tumor-free survival was 70%. Thirty-one patients (63%) were alive, without tumor recurrence and with a patent vascular reconstruction at 24 months. No patient died or lost a limb due to occlusion of the vascular reconstruction. Contemporary reconstructive vascular procedures permit resection of tumors that involve major vascular structures with acceptable early and late morbidity and mortality.

Management of Infected Femoral Closure Devices

An increase in infectious complications has been noted with the introduction of percutaneous femoral artery closure devices. We report five cases of infected groins and/or femoral arteries following angiographic procedures that were completed using the Perclose Suture Mediated Closure Device (Perclose). Each patient required drainage of the abscess and removal of the Perclose suture. Most patients required more extensive vascular reconstructive procedures. When these complications arise, we recommend expeditious drainage of the abscess, removal of the suture, and adequate exposure of the femoral artery to facilitate repair of the vessel.

Management of infected femoral closure devices

An increase in infectious complications has been noted with the introduction of percutaneous femoral artery closure devices. We report five cases of infected groins and/or femoral arteries following angiographic procedures that were completed using the Perclose Suture Mediated Closure Device (Perclose). Each patient required drainage of the abscess and removal of the Perclose suture. Most patients required more extensive vascular reconstructive procedures. When these complications arise, we recommend expeditious drainage of the abscess, removal of the suture, and adequate exposure of the femoral artery to facilitate repair of the vessel.

Regional Extra-Corporeal Circulation to Protect Transplanted Kidney and Pancreas from Ischemia during Vascular Reconstruction

The development of severe aorto-ilio-femoral atherosclerotic disease in a patient with a previous double transplantation, kidney and pancreas, is a major surgical challenge. The transplanted organs have to be protected from extensive ischemia during the vascular reconstructive procedure and achieve optimal revascularization. The surgical management of a complex case where regional extra-corporeal circulation was used to protect transplanted pancreas and kidney during aorto-bifemoral vascular grafting in a 39 yr old diabetic patient is described. Regional femoro-femoral extra-corporeal circulation with an oxygenator is a safe technique that allows time for the proximal revascularization, minimizes the warm organ ischemia time and results in preservation of organ function.

Regional extra-corporeal circulation to protect transplanted kidney and pancreas from ischemia during vascular reconstruction

The development of severe aorto-ilio-femoral atherosclerotic disease in a patient with a previous double transplantation, kidney and pancreas, is a major surgical challenge. The transplanted organs have to be protected from extensive ischemia during the vascular reconstructive procedure and achieve optimal revascularization. The surgical management of a complex case where regional extra-corporeal circulation was used to protect transplanted pancreas and kidney during aorto-bifemoral vascular grafting in a 39 yr old diabetic patient is described. Regional femoro-femoral extra-corporeal circulation with an oxygenator is a safe technique that allows time for the proximal revascularization, minimizes the warm organ ischemia time and results in preservation of organ function.

Local delivery of mithramycin restores vascular reactivity and inhibits neointimal formation in injured arteries and vascular grafts

Arterial restenosis is responsible for the high failure rates of vascular reconstruction procedures. Local sustained drug delivery has shown promise in the prevention of restenosis. The drug release rate from mithramycin-loaded EVA matrices (0.1%) was evaluated, and their antirestenotic effect was studied in the rat carotid model and rabbit model of vascular grafts. The modulation of c-myc expression by mithramycin treatment was examined by immunohistochemistry in the rat carotid model. The proliferative response of injured rat arteries was studied by bromdeoxyuridine (BrdU) immunostaining. The impact of mithramycin treatment on vasomotor responses of the venous segments grafted into arterial circulation was studied ex vivo using vasoreactive compounds. Mithramycin was released exponentially from EVA matrices in PBS. Matrices co-formulated with PEG-4600 revealed enhanced release kinetics. The perivascular implantation of drug-loaded EVA–PEG matrices led to 50% reduction of neointimal formation, and reduced the c-myc expression and BrdU labeling in comparison to control implants. Decreased sensitivity of mithramycin-treated grafts to serotonin-induced vasoconstriction was observed. Local perivascular mithramycin treatment limits the functional alteration caused by the grafting of venous segments in high-pressure arterial environment, and potently inhibits stenosis secondary to grafting and angioplasty injury. The antirestenotic effect is associated with reduced c-myc expression and with subsequent decrease in SMC proliferation.

Simulated vascular reconstruction in a virtual operating theatre

We present an experimentation environment that combines interactive visualisation of patient-specific vascular medical data with a flow simulation environment into an interactive exploration environment that provides a virtual operating theatre in which vascular reconstruction procedures can be simulated.

Evaluation and long-term outcome of pediatric renovascular hypertension.

Seventeen children with renovascular hypertension were managed at the Royal Children's Hospital, Melbourne, over the 20-year period from 1975 to 1996. The age at presentation ranged from 10 days to 18 years. All children presented with severe hypertension with mean systolic blood pressure 7 standard deviations above age-matched averages and mean diastolic blood pressure 5.5 standard deviations above age-matched averages. Neurofibromatosis was the most common etiology (58% of patients) and there were no cases of Takayasu's arteritis. Patients underwent a variety of biochemical and imaging investigations but in all cases renal angiography was necessary for definitive diagnosis and for planning therapy. Ten of the 17 patients had surgical procedures performed. Percutaneous transluminal angioplasty was performed in four patients but led to cure in only one patient following thrombosis of the affected artery producing segmental renal infarction. Other vascular reconstructive procedures, including the use of autologous or synthetic bypass grafts and autotransplantation, produced cure of hypertension in 50% of children with improvement in a further 30%. The long-term outlook for children treated with surgical reconstructive procedures was excellent. One patient underwent surgery for avulsion of an arterial graft following a pubertal growth spurt. No other patient originally cured by surgery has required reoperation with no cases of restenosis at a mean follow-up of 11 years 3 months.

Lung conservation techniques: bronchial sleeve resection and reconstruction of the pulmonary artery.

Bronchial and vascular reconstructive procedures are a technically feasible alternative to pneumonectomy and have the advantage of sparing functioning lung parenchyma. Between 1989 and 1999, we performed bronchovascular sleeve resection and reconstruction in 145 patients (109 men, 36 women; age range, 26 to 76 years, mean, 56 years) with non-small-cell lung cancer (NSCLCL). Forty-one patients had induction chemotherapy and 3 had pre-operative radiotherapy. Immediate and long-term postoperative evaluation included bronchoscopy, spirometry, electrocardiogram, Doppler echocardiography, and perfusion lung scans, computed tomography and, only recently, angio-magnetic resonance (MR) imaging. Follow-up ranged between 3 months and 10 years (mean, 3.7 years) and is complete for all patients. We report the results of this series and conclude that morbidity, mortality, and functional data indicate that bronchovascular reconstructions are equal to standard lobectomy in terms of pulmonary function. Long-term survival is comparable with that reported for standard resection (lobectomy-pneumonectomy). These findings suggest that even complex lung-sparing operations can be proposed as adequate procedures in the treatment of lung cancer as long as a complete anatomical resection is obtained.

INTRAOPERATIVE USE OF ANTICOAGULANTS AND ANTITHROMBOTICS: Heparin and Beyond

Certain surgical interventions can perturb the hemostatic system significantly, making the patient prone to intraoperative and postoperative thrombus formation. The consequences of unabated thrombus formation can be devastating. The risk of developing deep vein thrombosis (DVT) after certain surgical procedures can be as high as 40% to 80%, while the incidence of fatal pulmonary embolism is 1% to 5%. 11 , 49 Antithrombotic therapy is usually instituted perioperatively, and has significant impact on the choice of anesthetic technique. 1 , 26 Anticoagulation is an imperative part of vascular reconstructive procedures, as iatrogenic cessation of blood flow and exposure of thrombogenic subepithelial surfaces can act as a nidus for arterial thrombus formation. Furthermore, cardiopulmonary bypass (CPB) procedures with extracorporeal circulation cannot be possible without intraoperative anticoagulation. Intraoperatively, unfractionated heparin (UH) is used most commonly to inhibit coagulation. Although it will likely continue to be used extensively in the near future, newer agents are on the horizon. These agents may be used in clinical situations where heparin is either contraindicated, or where more predictable responses with less side effects are needed. Because of their wide clinical use, it is imperative to be familiar with heparin and the newer anticoagulant agents. Furthermore, surgical interventions, anesthetics, and some commonly used medications affect coagulation. These effects on the hemostatic system will be reviewed, followed by a discussion of antithrombotics, perioperative monitoring, and clinical management. Intraoperative use of thrombolytics and anesthetic implications of anticoagulation will be discussed.

USE OF A CADAVERIC DONOR AORTA FOR VASCULAR REPLACEMENT IN KIDNEY TRANSPLANTATION

Currently the number of kidney transplants performed each year is limited only by the number of donor organs available. The disparity between the number of patients awaiting a kidney and the number of suitable organs recovered continues to increase.' In addition, an increasing number of patients on dialysis who are older than 60 years are seeking transplantation as an option for renal replacement therapy, many of whom have significant atherosclerotic disease of the iliac blood vessels andor have undergone previous vascular reconstructive procedures on the cardiovascular system. We report the use of a cadaveric donor aorta to fashion a graft for donor renal artery replacement when the transplant renal artery was not usable.

Failed Vascular Reconstructive Procedure with Profoundly Ischemic Limbs Treated by Lumbar Sympathectomy

Failed Vascular Reconstructive Procedure with Profoundly Ischemic Limbs Treated by Lumbar Sympathectomy