(Stroke. 1999;30:749-754.)
© 1999 American Heart Association, Inc.
Original Contributions |
Plasticity of Language-Related Brain Function During Recovery From Stroke
From the MR Research Center (K.R.T.), University of Pittsburgh Medical Center, and the Department of Psychology (P.A.C., M.A.J.), Carnegie Mellon University, Pittsburgh, Pa.
Correspondence to Keith R. Thulborn, MD, PhD, B855, MR Research Center, Presbyterian University Hospital, 200 Lothrop St, Pittsburgh PA 15213. E-mail keith{at}mrctr.upmc.edu
Background and Purpose—This study was undertaken to correlate functional recovery from aphasia after acute stroke with the temporal evolution of the anatomic, physiological, and functional changes as measured by MRI.
Methods—Blood oxygenation level–dependent contrast and echo-planar MRI were used to map language comprehension in 6 normal adults and in 2 adult patients during recovery from acute stroke presenting with aphasia. Perfusion, diffusion, sodium, and conventional anatomic MRI were used to follow physiological and structural changes.
Results—The normal activation pattern for language comprehension showed activation predominately in left-sided Wernicke's and Broca's areas, with laterality ratios of 0.8 and 0.3, respectively. Recovery of the patient confirmed as having a completed stroke affecting Broca's area occurred rapidly with a shift of activation to the homologous region in the right hemisphere within 3 days, with continued rightward lateralization over 6 months. In the second patient, in whom mapping was performed fortuitously before stroke, recovery of a Wernicke's aphasia showed a similar increasing rightward shift in activation recruitment over 9 months after the event.
Conclusions—Recovery of aphasia in adults can occur rapidly and is concomitant with an activation pattern that changes from left to a homologous right hemispheric pattern. Such recovery occurs even when the stroke evolves to completion. Such plasticity must be considered when evaluating stroke interventions based on behavioral and neurological measurements.
Key Words: magnetic resonance imaging • aphasia • cerebral infarction • stroke outcome
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