We retrospectively reviewed the medical records of patients with the clinical diagnosis of CIDP in IRAN university hospitals in 2014 on the basis of a progressive or relapsing polyradiculoneuropathy developing over at least 2 months. Electrophysiological studies were performed with standard surface stimulation and recording techniques. The amplitude, the area under the curve (AREA), and the duration (DUR) of the negative peak of the compound muscle action potential (CMAP) were determined as well as NCV, and DL from the Median, Ulnar, Tibial, and Peroneal nerves in both side.
prominent observation of the present study is that the frequency of abnormal DL, NCV and Temporal dispersion in Median nerve was more than other nerves. Unequivocal conduction block was more frequent in Peroneal nerve and possible conduction block in Ulnar nerve was more.
In electrodiagnostinc pattern of CIDP, Median nerve shows more frequent patterns of demyelinatoin Iranian patient.
Demyelinating Polyradiculoneuropathy, Conduction Block, Conduction Velocity, Temporal Dispersion, Distal Latency.