Brain Reorganization in Patients with Brachial Plexus Injury: a Longitudinal Functional MRI Study

Overview

Journal ScientificWorldJournal

Publisher Wiley

Specialty Biology

Date 2012 May 25

PMID 22623904

Citations 9

Authors

Takeharu Yoshikawa

Naoto Hayashi

Yasuhito Tajiri

Yoshirou Satake

Kuni Ohtomo

Affiliations

Soon will be listed here.

Abstract

The aim of this study is to assess plastic changes of the sensorimotor cortex (SMC) in patients with traumatic brachial plexus injury (BPI) using functional magnetic resonance imaging (fMRI). Twenty patients with traumatic BPI underwent fMRI using blood oxygen level-dependent technique with echo-planar imaging before the operation. Sixteen patients underwent their second fMRI at approximately one year after injury. The subjects performed two tasks: a flexion-extension task of the affected elbow and a task of the unaffected elbow. After activation, maps were generated, the number of significantly activated voxels in SMC contralateral to the elbow movement in the affected elbow task study (N(af)) and that in the unaffected task study (N(unaf)) were counted. An asymmetry index (AI) was calculated, where AI = (N(af) - N(unaf))/(N(af) + N(unaf)). Ten healthy volunteers were also included in this fMRI study. The AI of the first fMRI of the patients with BPI was significantly lower than that of the healthy subjects (P = 0.035). The AI of the second fMRI significantly decreased compared with that of the first fMRI (P = 0.045). Brain reorganization associates with peripheral nervous changes after BPI and after operation for functional reconstruction.

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