Final answer:
The incidence of phrenic nerve paralysis with supraclavicular block is rare but possible. The phrenic nerve is a nerve that originates from the cervical spinal nerves and provides motor innervation to the diaphragm. If the phrenic nerve is affected by the block, it can lead to phrenic nerve paralysis, causing respiratory distress.
Step-by-step explanation:
The incidence of phrenic nerve paralysis with supraclavicular block is rare but possible.
The phrenic nerve is a nerve that originates from the cervical spinal nerves and provides motor innervation to the diaphragm, which is responsible for breathing. During a supraclavicular block, a local anesthetic is injected near the brachial plexus, which includes the phrenic nerve.
If the phrenic nerve is affected by the block, it can lead to phrenic nerve paralysis, which can cause respiratory distress and difficulty breathing.