• Zhijian Liang, Jinsheng Zeng, Cuimei Zhang, Sirun Liu, Xueying Ling, Anding Xu, Li Ling, Fang Wang, and Zhong Pei.
• Department of Neurology and Stroke Centre, Sun Yat-Sen University, Guangzhou, PR China.
• Cerebrovasc. Dis. 2008 Jan 1; 25 (3): 209-16.

BackgroundSecondary degeneration following supratentorial stroke has been detected by some studies using diffusion tensor imaging (DTI), but the anterograde and retrograde degeneration in pyramidal tract after pontine infarction and its potential clinical significance are not well understood.MethodsFourteen patients with a recent pontine infarct underwent three DTIs at week 1, week 4, and week 12 after onset. Fourteen age- and gender-matched controls underwent DTI once. Mean diffusivity and fractional anisotropy (FA) were measured. Neurological deficit, motor deficit and life independence were assessed with the NIH Stroke Scale, Fugl-Meyer scale and Barthel index, respectively, 2 h before each DTI examination.ResultsFA values at the ipsilateral medulla and the proximal portion of the pyramidal tract, including centrum semiovale, internal capsule and cerebral peduncle, significantly decreased progressively from week 1 to week 12 (p < 0.01). The NIH Stroke Scale decreased; Fugl-Meyer scale and Barthel index increased significantly over the time points (p < 0.01). The absolute values of percent reduction of FA value at the ipsilateral medulla and the proximal portion of pyramidal tract correlated negatively with the absolute values of percent reduction of the NIH Stroke Scale and percent increase of the Fugl-Meyer scale.ConclusionsProgressive anterograde and retrograde degeneration in pyramidal tract revealed by DTI may hinder the process of neurological recovery after a pontine infarct. To confirm the clinical significance, future studies with a longer observation period and a larger sample size of patients with more homogeneous pontine infarcts are still needed.

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