title: Early prediction of functional recovery after experimental stroke: functional magnetic resonance imaging, electrophysiology, and behavioral testing in rats.
abstract: Therapeutic success of treatment of cerebral diseases must be assessed in terms of functional outcome. In experimental stroke studies, this has been limited to behavioral studies combined with morphological evaluations and single time point functional magnetic resonance imaging (fMRI) measurements but lacking the access to understanding underlying mechanisms for alterations in brain activation. Using a recently developed blood oxygenation level-dependent fMRI protocol to study longitudinal and intraindividual profiles of functional brain activation in the somatosensory system, we have demonstrated activation reemergence in the original representation field as the basic principle of functional recovery from experimental stroke. No plastic reorganization has been observed at any time point during 7 weeks after stroke induction. Applying combined recording of fMRI and somatosensory evoked potentials, we observed a tight coupling of electrical brain activity and hemodynamic response at all times, indicating persistent preservation of neurovascular coupling. Identification of functional brain recovery mechanisms has important implications for the understanding of brain plasticity after cerebral lesions, whereas preservation of neurovascular coupling is important for the clinical translation of fMRI.
authors.affiliation: In Vivo NMR Laboratory, Max-Planck-Institute for Neurological Research, 50931 Cologne, Germany.
authors.forename: Ralph
authors.initials: R
authors.lastname: Weber
authors.forename: Pedro
authors.initials: P
authors.lastname: Ramos-Cabrer
authors.forename: Carlos
authors.initials: C
authors.lastname: Justicia
authors.forename: Dirk
authors.initials: D
authors.lastname: Wiedermann
authors.forename: Cordula
authors.initials: C
authors.lastname: Strecker
authors.forename: Christiane
authors.initials: C
authors.lastname: Sprenger
authors.forename: Mathias
authors.initials: M
authors.lastname: Hoehn
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D004594:Electrophysiology; D005073:Evoked Potentials, Somatosensory / Q000502:physiology; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D011237:Predictive Value of Tests; D011597:Psychomotor Performance / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D020127:Recovery of Function / Q000502:physiology*; D013003:Somatosensory Cortex / Q000502:physiology; D020521:Stroke / Q000175:diagnosis / Q000503:physiopathology*; D013997:Time Factors