Task: Answer Verification
Input (English): Question: Does the sequence of administration of 1.5 % mepivacaine and 0.5 % bupivacaine affect latency of block onset or duration of analgesia in ultrasound-guided interscalene block?
Answer: The sequence in which 15 mL mepivacaine 1.5% and 15 mL bupivacaine 0.5% are administered does not seem to have a clinically meaningful effect on duration or onset of ultrasound-guided interscalene brachial plexus block.
Output (English): no