551. Ultra-Sound Femoral Nerve Block Combined With Continuous Sciatic Nerve Block for Lower Limb Arterial Bypass Surgery. (1st September 2008) - Giardina, M.; Zampaglione, D.; Versaci, A.; Risitano, D. C.; Noto, A.; Messina, R.; Benedetto, F.; La Spada, M.; David, A.