in a randomized double-blind study , 40 orthopedic patients received one of the following four local anesthetics epidurally : 0.5 % bupivacaine-hcl ( n = 10 ) , 0.5 % bupivacaine-co2 ( n = 10 ) , 1.0 % etidocaine ( n = 10 ) , and 1.5 % etidocaine ( n = 10 ) , all without addition of a vasoconstrictor .
C0887621
bupivacaine-hcl
C0006400
bupivacaine