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Program Book - Keck School of Medicine of USC - University of ...

Program Book - Keck School of Medicine of USC - University of ...

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Pre-emptive Invasive Evaluation• Early angiography and PTA may preventsubsequent access thrombosis• Intervention on an open (non–thrombosed)access has longer patency than intervention ona closed (thrombosed) access• Some studies suggest benefit• Other studies suggest no benefit• Dember et al Kidney Int 2004• Moist LM J Am Soc Nephrol 2003• Bittl JA Cath Cardiovasc Intervent 2009p 0.16• Static venous pressure/Systolic blood pressureratio (SVPR)• 64 patients with ↑SVPR• >0.4 Intervention• Observation groupfollowed for graftthrombosis• Primary endpoint: graftabandonment4-step Approach1. Thrombectomy <strong>of</strong> outflow, fistula/graftand inflow segments2. PTA <strong>of</strong> venous outflow stenosis3. Fogarty thrombectomy <strong>of</strong> adherentclot at arterial inflow anastomosis4. Angiography <strong>of</strong> fistula/graft, centralveins and inflow region127

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