Extracorporeal membrane oxygenation (ECMO) is generally used as a last resort toE xtracorporeal membrane oxygenation (ECMO) is a short-term mechanical circulatory support system for patients who are in advanced cardiac, pulmonary, or combined cardiopulmonary failure. Patients in cardiac failure are typically placed on venoarterial ECMO, and patients in respiratory failure are placed on venovenous ECMO. Large-diameter cannulas are needed to maintain high blood flow through the mechanical circulatory support system. However, upon insertion into blood vessels, these cannulas can reduce native blood flow, especially when vessel diameters are small. Acute limb ischemia can necessitate vascular reconstruction or amputation of the patient's extremities. We describe a modified T-graft technique that we used in order to avoid acute limb ischemia from ECMO in a young woman whose femoral arteries (FAs) were small.
Case ReportIn April 2012, an 18-year-old woman presented with viral cardiomyopathy, systolic heart failure, and acute respiratory distress syndrome. She was intubated and was started on full mechanical ventilation. However, her pulmonary status continued to deteriorate, so we emergently placed her on ECMO. A 15F cannula was inserted in her right common FA, and a 19F cannula was inserted in her right common femoral vein. Several attempts to percutaneously place an antegrade distal-perfusion catheter in the right superficial FA failed because of small vessel size (diameter, 3-4 mm) and vasoconstriction. Critical limb ischemia subsequently developed in the patient's right leg. She remained hemodynamically unstable and would not have been able to tolerate a limb-revascularization procedure. During the next few days, her hemodynamic status improved; however, she became increasingly acidotic and sustained rhabdomyolysis and renal failure as the limb ischemia progressed. To prevent progression of the renal failure secondary to rhabdomyolysis, an emergency guillotine amputation of her right leg was performed, above the knee. At the same time, we decided to switch the ECMO to left femoral access by means of a modified T-graft technique, to avoid critical limb ischemia of her left leg.