Do you typically encounter phrenic involvement in patients with CIDP?

No. Respiratory involvement is very unusual in CIDP, unlike GBS (AIDP) where it is common. In CIDP frequency of phrenic nerve involvement is <10%, probably below 5. Of course, there are always exceptions to the rule. If the phrenic nerve is involved and the mechanism is predominantly demyelinating (conduction block) as opposed to axonal degeneration, which can be gauged by assessing the CMAP amplitude of the phrenic nerve conduction study, theoretically treatment can lead to significant improvem...