Effect of Warm Bupivacaine on Subtenon Block.

bupivacaine will be on a sterile shelf in the operating room at 23°C. The empty syringes and needles will be also on the same shelf before their use.

bupivacaine will be warmed to 37◦C for 20 minutes. The empty syringes and needles, in their packaging, will be held at the same temperature for at least 2 hours before initiating the block.