Final answer:
A continuous catheter can be used on a SNB preoperatively to provide longer pain relief.
Step-by-step explanation:
A continuous catheter can be used on a SNB (Selective Nerve Block) preoperatively to provide longer pain relief. This is true.
It appears there might be a slight error or confusion in your question. Continuous catheter use in the context of pain relief is commonly associated with epidural or peripheral nerve catheters rather than the term "SNB," which typically stands for "Sciatic Nerve Block."