PuSH - Publikationsserver des Helmholtz Zentrums München: Structural nerve remodeling at 3-t mr neurography differs between painful and painless diabetic polyneuropathy in type 1 or 2 diabetes.

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Jende, J.M.E.* ; Groener, J.B.* ; Kender, Z.* ; Rother, C.* ; Hahn, A.* ; Hilgenfeld, T.* ; Juerchott, A.* ; Preisner, F.* ; Heiland, S.* ; Kopf, S.* ; Nawroth, P.P. ; Bendszus, M.* ; Kurz, F.T.*

Structural nerve remodeling at 3-t mr neurography differs between painful and painless diabetic polyneuropathy in type 1 or 2 diabetes.

Radiology 294, 405-414 (2020)

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Background: The pathophysiologic mechanisms underlying painful symptoms in diabetic polyneuropathy (DPN) are poorly understood.They may be associated with MRI characteristics, which have not yet been investigated.Purpose: To investigate correlations between nerve structure, load and spatial distribution of nerve lesions, and pain in patients with DPN.Materials and Methods: In this prospective single-center cross-sectional study, participants with type 1 or 2 diabetes volunteered between June 2015 and March 2018. Participants underwent 3-T MR neurography of the sciatic nerve with a T2-weighed fat-suppressed sequence, which was preceded by clinical and electrophysiologic tests. For group comparisons, analysis of variance or the Kruskal-Wall is test was performed depending on Gaussian or non-Gaussian distribution of data. Spearman correlation coefficients were calculated for correlation analysis.Results: A total of 131 participants (mean age, 62 years +/- 11 [standard deviation]; 82 men) with either type 1 (n = 45) or type 2 (n = 86) diabetes were evaluated with painful (n = 64), painless (n = 37), or no (n = 30) DPN. Participants who had painful diabetic neuropathy had a higher percentage of nerve lesions in the full nerve volume (15.2% +/- 1.6) than did participants with nonpainful DPN (10.4% +/- 1.7, P = .03) or no DPN (8.3% +/- 1.7; P<.001). The amount and extension of T2-weighted hyperintense nerve lesions correlated positively with the neuropathy disability score (r = 0.37; 95% confidence interval [CI]: 0.21, 0.52; r = 0.37; 95% CI: 0.20, 0.52, respectively) and the neuropathy symptom score (r = 0.41; 95% CI: 0.25, 0.55; r = 0.34; 95% CI: 0.17,0.49, respectively). Negative correlations were found for the tibial nerve conduction velocity (r = -0.23; 95% CI: -0.44, -0.01; r = 20.37; 95% CI: 20.55, 20.15, respectively). The cross-sectional area of the nerve was positively correlated with the neuropathy disability score (r = 0.23; 95% CI: 0.03, 0.36). Negative correlations were found for the tibial nerve conduction velocity (r = 20.24; 95% CI: -0.45, -0.01).Conclusion: The amount and extension of T2-weighted hyperintense fascicular nerve lesions were greater in patients with painful diabetic neuropathy than in those with painless diabetic neuropathy. These results suggest that proximal fascicular damage is associated with the evolution of painful sensory symptoms in diabetic polyneuropathy.

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