Final answer:
A nerve block can be used to decrease tourniquet pain during a Bier block.
Step-by-step explanation:
The block that can be used to decrease tourniquet pain during a Bier block is a nerve block. A nerve block involves the injection of a local anesthetic, such as lidocaine, near a specific nerve or nerve group to block the transmission of pain signals. By blocking the transmission of pain signals, the nerve block can help reduce tourniquet pain.