Sub-Tenon's infiltration using bupivacaine 0.5% decreases acute postoperative pain and opioid requirement after posterior segment surgery.

high. Only distal muscular responses would be accepted. We would be interested to know more about patient acceptance of the procedure, as penetration of the pectoral muscle with a thin needle is sometimes painful. What about a large 17 or 18G Tuohy needle? Although sophisticated methods may be helpful in some circumstances, we believe no device will ever replace good training in the ®eld of peripheral nerve block.