300 Section - Electrophysiological Subtypes of Guillain Barré Syndrome in the Population of the Pediatric Unit of the National Medical Center of the West from 2021-2022.

Objectives : To determine the frequency of Gillan Barre electrophysiological subtypes in the pediatric population of the Pediatric UMAE of the National Medical Center of the West

Design: This was an observational, retrospective, cross-sectional, and descriptive study. It was conducted in the physical medicine and rehabilitation service at the Pediatric High Specialty Medical Unit (UMAE) of CMNO. Over a two-year period, the records of hospitalized patients diagnosed with Guillain-Barré syndrome (GBS) who met the inclusion criteria were reviewed: hospitalized patients under 15 years of age, with neuromuscular blockade (NMB) performed between 7 and 50 days after the onset of illness, and without comorbidities. Patients with normal NMB results were excluded. A total of 17 patients were included, and 2 were excluded. Motor NMB of the median, ulnar, tibial, and peroneal nerves was evaluated, as well as F and sensory responses in the median, ulnar, peroneal, and sural nerves. Based on the NMB results, patients were classified as AIDP, AMAN, and AMSAN.

Results: From 2021-2022, the study population consisted of 17 patients diagnosed with GB, with a mean age of 8.6 years and a sex distribution of 7 men and 10 women. Of the electrophysiological subtypes, 41.17% corresponded to AIDP, 47.05% to AMAN, and 11.76% to AMSAN.

Conclusion: It was concluded that the most frequent electrophysiological subtype was AMAN, closely followed by AIDP. Axonal forms predominated. Women were more affected, and a slight predominance was found during the winter months.