Faculty Bibliography

PURPOSE: Intravascular stents have become important tools for the management of vascular lesions; however, stents in combination with vascular grafts have only recently reached clinical application. This report describes an experience with stented grafts for the treatment of penetrating arterial trauma. METHODS: Seven transluminally placed stented grafts were used to treat one arteriovenous fistula and six pseudoaneurysms. These grafts were successfully inserted percutaneously or through open arteriotomies that were remote from the site of vascular trauma. The devices were composed of balloon-expandable stainless steel stents covered with polytetrafluoroethylene grafts. RESULTS: Patency up to 14 months was achieved (mean follow-up 6.5 months) with these stented grafts. The use of stented grafts appears to be associated with decreased blood loss, a less invasive insertion procedure, reduced requirements for anesthesia, and a limited need for an extensive dissection in the traumatized field. These advantages are particularly important in patients with central arteriovenous fistulas or false aneurysms who are critically ill from other coexisting injuries or medical comorbidities. CONCLUSIONS: The use of stented grafts already appears justified to treat traumatic arterial lesions in critically ill patients. Although the early results with the seven cases in this report are encouraging, documentation of long-term effectiveness must be obtained before these devices can be recommended for widespread or generalized use in the treatment of major arterial injuries

BACKGROUND: Endovascular stented grafts employ a new technique that blends intravascular stent and prosthetic graft technologies. These devices may be used to treat arterial aneurysms, occlusive disease, and vascular injuries. This report describes the application of stented grafts to the treatment of limb-threatening ischemia secondary to occlusive disease of the aorta, iliac, and femoral arteries. METHODS: Three patients with limb-threatening ischemia and severe comorbid medical illnesses were treated with transvascular stented grafts that were composed of 6-mm thin-walled polytetrafluoroethylene grafts and Palmaz balloon expandable stents. The grafts were inserted through a cutdown in an artery remote from the site of occlusion and introduced into the vascular system within 14-Fr introducer sheaths. RESULTS: Technical success was documented in all three patients with restoration of arterial continuity following stent graft deployment. Patency and limb salvage has been achieved to 1 year. One patient required further dilatation of the proximal stent at 6 weeks. Complications were limited to an iliofemoral deep vein thrombosis in one patient. CONCLUSIONS: Endovascular stented grafts can be inserted to treat limb-threatening ischemia. Although these initial results are encouraging, greater experience in more patients observed for longer periods of time is necessary before this technique can be advocated for widespread use

We reviewed 95 cases of vein graft and anastomotic lesions treated with percutaneous transluminal balloon angioplasty (PTA) and 30 cases treated surgically. The therapy was deemed a failure if the lesion recurred or if the graft closed. The 21-month patency rate of lesions treated surgically was 86%, which was significantly better than the 42% patency rate for all lesions treated with PTA (P < 0.01). An evaluation of the lesion and graft characteristics that could influence the patency of stenotic lesions treated with PTA included: lesion length, minimum graft diameter, lesion location, and lesion type. The 66% patency rate at 24 months for the 41 simple lesions (single, nonrecurrent, < 15 mm in length, and within grafts > or = 3 mm minimal diameter) was significantly better than the 17% patency rate for the 50 complex lesions (multiple, recurrent, > or = 15 mm in length, or within grafts < 3 mm in minimal diameter) (P < 0.01). In addition, the 21-month patency rate for the surgically treated group (86%) was not significantly better than that of the angioplasty-treated simple lesions (66%). When feasible, vein graft lesions are best treated with simple surgical interventions. PTA can be useful to maintain the patency of severely compromised grafts prior to surgical repair, to treat simple lesions difficult to reach surgically, and for patients with medical contraindications for an operation

PURPOSE: The absence of sufficient length of suitable autologous vein occasionally prohibits the treatment of severe distal lower extremity arterial occlusive disease with a standard distal bypass originating from the common femoral artery. During the past 11 years, we have therefore selectively performed short distal bypasses originating from the infrapopliteal arteries in patients with limb-threatening ischemia and occlusive lesions limited to the distal tibial and peroneal arteries. This report summarizes our experience with these tibial artery based distal bypasses. METHODS: Forty-two distal lower extremity arterial bypasses originating from infrapopliteal arteries in 41 patients were performed over an 11-year period. Autologous vein was used as the bypass conduit in all cases. Extensions from a more proximal bypass were excluded. RESULTS: The primary patency rate of these tibiotibial bypasses was 77% at 1 year and 62% after 5 years. The limb salvage rate after 5 years was 74%. The perioperative mortality rate was low (2%), but the 5-year patient survival rate (64%) was similar to that with more standard lower extremity arterial reconstructive procedures. CONCLUSIONS: Tibiotibial bypass is an effective limb salvage procedure in carefully selected patients with distal tibial artery occlusive disease and limited autologous vein. It offers a durable means of distal revascularization in circumstances in which a standard operation might not be desirable or possible

This report describes the use of an endoluminally placed stented graft to repair a large (2.6 by 2.6 by 15 cm) popliteal aneurysm in a 63-year-old man with advanced heart disease. Two balloon-expandable stents were attached to a 6 mm polytetrafluoroethylene graft, which was inserted with the patient receiving local anesthetic through a proximal superficial femoral artery arteriotomy. Repeat arteriography and duplex ultrasonography performed up to 3 months after the procedure documented graft and distal artery patency and complete aneurysmal exclusion without distal emboli. This experience demonstrates technical feasibility and early graft patency. However, additional experience and follow-up will be needed to assess the value of this minimally invasive procedure in the management of popliteal aneurysmal disease

Purpose: Our purpose was to evaluate the efficacy and limitations of the Auth Rotablator, an atherectomy device recently approved by the U.S. food and Drug Administration for general use in treating peripheral arterial occlusive lesions. Methods: Between August 1987 and December 1990, 72 patients from three medical centers (University of California, Los Angeles, Montefore, and Stanford) underwent atherectomy with the Auth Rotablator in 79 limbs and 107 arteries: 2 iliac, 45 femoral, 29 popliteal, and 31 tibial. The average age among the 72 patients was 69 years (43 to 91 years), and 67% were men. Indications for atherectomy were claudication in 34 (43%), limb threat in 44 (56%), and asymptomatic in 1 (1%) case. Average ankle-brachial index was 0.47 (0 to 0.81). Average length of lesions was 9 cm (1 to 40 cm); 70 treated arterial segments were less than 10 cm and 37 were greater than 10 cm. All patients underwent arterial pulse examination, vascular laboratory Doppler measurement of ankle-brachial indexes, and arteriography before and after surgery and at follow-up intervals during a period of 15 to 41 months (mean 27 months). Results: Angiographic success (residual lumen < 25% stenosis) was achieved in 70 (89%) of 79 limbs and 82 (77%) of 107 arteries: iliac 1 (50%) of 2, femoral 38 (84%) of 45, popliteal 24 (83%) of 29, and tibial 19 (61%) of 31. In-hospital clinical and hemodynamic success was achieved in 61 (77%) of 79 limbs. The cumulative primary patency rate was 47% at 6 months, 31% at 12 months, and 18.6% at 24 months. Complications included hemoglobinuria in 10 cases (13%), emboli in eight cases (10%), dissection in five cases (6%), perforation in three cases (4%), hematoma in four cases (5%), and infection in one case (1%). There were nine early thromboses (11%) and two device-related amputations (2.5%). Conclusion: Peripheral atherectomy with the Auth Rotablator currently has limited application because of frequent early thromboembolic complications and poor late patency rates. Atherectomy is not generally recommended for treating peripheral arterial occlusive lesions until these problems with early thromboemboli, occlusions, and late restenoses are solved. $$: