Balloon angioplasty and primary stenting of symptomatic aortoiliac occlusive lesions is a durable treatment option. Long-term follow-up of treated patients shows outcomes that are comparable with direct surgical intervention. IVUS significantly improved the long-term patency of iliac arterial lesions treated with balloon angioplasty and stenting by defining the appropriate angioplasty diameter endpoint and adequacy of stent deployment.

Femoral-infrapopliteal bypass graft for limb salvage with a cryopreserved saphenous vein allograft can be an acceptable alternative when autogenous vein is not available. Our treatment protocol substantially improved allograft patency and limb salvage when compared with current published data.

Peripheral atherectomy can achieve good early clinical and hemodynamic success in patients with TASC C lesions and critical limb ischemia. However, mid-term restenosis rates are high in this challenging cohort of patients.

The use of IVUS may be the best means for assessing adequacy of arterial stent deployment. Our study suggests that the use of IVUS improves the long-term clinical outcome of balloon angioplasty and stented aortoiliac occlusive lesions.

Abstract--The reaction of benzene with exchangeable Cu(II) and Fe(III) in hectorite clay films was studied by electron paramagnetic resonance (EPR). The reaction when carried out in a sealed tube between 60* and 100*C produced a variety of organic radical products. The nature of these products depended on the concentration of water in the reaction medium and the reaction time. The free radicals were accompanied by a reduction in the oxidation state of the metal ions; this process had a zero-order dependence on the metal ion concentration. The activation energies determined from the zero-order rate constants are 67 _+ 11 kJ/mole (Cu(II)) and 46 _+ 6 kJ/mole (Fe(III)). The free radicals initially formed under anhydrous conditions appeared to populate sites in the interlayer region; the activation energies determined for this first order process are 57 • 9 kJ/mole (Cu(II)) and 42 • 3 kJ/mole (Fe(III)). These activation energies are within experimental error of those determined from the metal ion kinetics. The EPR signal due to organic radicals showed little temperature dependence; thus, exchange processes involving organic free radicals were probably not important in determining EPR lineshapes.