Figure 4.

Nerve conduction studies and nerve ultrasound variables in immunoglobulin M (IgM) neuropathy and chronic inflammatory demyelinating polyneuropathy (CIDP). Variables of nerve conduction studies and nerve ultrasound differ between demyelinating neuropathy associated with IgM monoclonal gammopathy of unknown significance (IgM neuropathy) and CIDP. Upper panels show distal motor latency (DML) and terminal latency index (TLI) in median nerve. Red dashed lines represent cutoff values for disproportionate prolongation of DML.6 Lower panel shows nerve ultrasound sum‐score of proximal median nerve segments: sum of nerve size of median nerve in forearm and upper arm in both arms (cross‐sectional area [CSA]). The blue dashed line represents proposed nerve ultrasound cutoff value after multivariate logistic regression and receiver operating characteristics analysis to discern IgM neuropathy from CIDP, error bars represent 2SD (i.e. 95%) [Color figure can be viewed at wileyonlinelibrary.com]