无题测验

1.       The mechanism of action of local anesthetics:

• Promote Na+ flowing inward, producing a persistent depolarization.

• Specifically blocks Na* channels on the inner surface of nerve cell membranes, impeding depolarization.

• Promote K+ inward flow, impeding depolarization.

• Reduce membrane permeability to Na+, K+, and Ca2+.

• Bind to extracellular Na+, preventing Na+ inward flow during depolarization.

2.    When an interscalene block is used, the most common block incompletion is:

• A. Radial nerve

• B. Median nerve

• C. Ulnar nerve

• D. Median nerve and radial nerve

• E. Radial nerve and ulnar nerve