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Abstract
Unilateral spatial neglect (USN) is a common and disabling cognitive consequence of stroke wherein individuals demonstrate decreased response to contralesional information. Here, we provide an updated narrative review of studies that shed light on the neural mechanisms and predictors of recovery of USN. Additionally, we report a rapid review of randomized controlled trials focusing on USN intervention, both nonpharmacological and pharmacological, published in the last 5 years. Randomized controlled trials are reviewed within the context of systematic reviews and meta-analyses of USN interventions published within the same time frame. The quality of randomized controlled trials of treatment is higher compared to quality reported in previous reviews and meta-analyses. However, remaining weaknesses in participant demographic reporting, as well as small, heterogenous samples, render generalizability and cross-study interpretation a challenge. Nevertheless, evidence regarding neural mechanisms underlying USN recovery and regarding the effectiveness of targeted USN interventions is accumulating and strengthening, setting the foundation for future investigations into patient-specific factors that may influence treatment response. We identify gaps and provide suggestions for future USN intervention research.
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Affiliation(s)
- Alexandra Zezinka Durfee
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD (A.Z.D., A.E.H.)
| | - Argye E Hillis
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD (A.Z.D., A.E.H.).,Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, MD (A.E.H.).,Department of Cognitive Science, Johns Hopkins University, Baltimore, MD (A.E.H.)
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Takamura Y, Imanishi M, Osaka M, Ohmatsu S, Tominaga T, Yamanaka K, Morioka S, Kawashima N. Intentional gaze shift to neglected space: a compensatory strategy during recovery after unilateral spatial neglect. Brain 2016; 139:2970-2982. [DOI: 10.1093/brain/aww226] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 07/23/2016] [Indexed: 11/13/2022] Open
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Lunven M, Thiebaut De Schotten M, Bourlon C, Duret C, Migliaccio R, Rode G, Bartolomeo P. White matter lesional predictors of chronic visual neglect: a longitudinal study. ACTA ACUST UNITED AC 2015; 138:746-60. [PMID: 25609686 DOI: 10.1093/brain/awu389] [Citation(s) in RCA: 155] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Chronic visual neglect prevents brain-damaged patients from returning to an independent and active life. Detecting predictors of persistent neglect as early as possible after the stroke is therefore crucial to plan the relevant interventions. Neglect signs do not only depend on focal brain lesions, but also on dysfunction of large-scale brain networks connected by white matter bundles. We explored the relationship between markers of axonal degeneration occurring after the stroke and visual neglect chronicity. A group of 45 patients with unilateral strokes in the right hemisphere underwent cognitive testing for neglect twice, first at the subacute phase (<3 months after onset) and then at the chronic phase (>1 year). For each patient, magnetic resonance imaging including diffusion sequences was performed at least 4 months after the stroke. After masking each patient's lesion, we used tract-based spatial statistics to obtain a voxel-wise statistical analysis of the fractional anisotropy data. Twenty-seven patients had signs of visual neglect at initial testing. Only 10 of these patients had recovered from neglect at follow-up. When compared with patients without neglect, the group including all subacute neglect patients had decreased fractional anisotropy in the second (II) and third (III) branches of the right superior longitudinal fasciculus, as well as in the splenium of the corpus callosum. The subgroup of chronic patients showed reduced fractional anisotropy in a portion the splenium, the forceps major, which provides interhemispheric communication between regions of the occipital lobe and of the superior parietal lobules. The severity of neglect correlated with fractional anisotropy values in superior longitudinal fasciculus II/III for subacute patients and in its caudal portion for chronic patients. Our results confirm a key role of fronto-parietal disconnection in the emergence and chronic persistence of neglect, and demonstrate an implication of caudal interhemispheric disconnection in chronic neglect. Splenial disconnection may prevent fronto-parietal networks in the left hemisphere from resolving the activity imbalance with their right hemisphere counterparts, thus leading to persistent neglect.
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Affiliation(s)
- Marine Lunven
- 1 INSERM U 1127, CNRS UMR 7225, Sorbonne Universités, and Université Pierre et Marie Curie-Paris 6, UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013 Paris, France 2 Service de Médecine Physique et Réadaptation, Unité de Rééducation Neurologique CRF 'Les Trois Soleils' Boissise le Roi, France 3 Inserm UMR_S 1028, CNRS UMR 5292, ImpAct, centre des neurosciences de Lyon, université Lyon-1, 16, avenue Lépine 69676 Bron, France
| | - Michel Thiebaut De Schotten
- 1 INSERM U 1127, CNRS UMR 7225, Sorbonne Universités, and Université Pierre et Marie Curie-Paris 6, UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013 Paris, France 4 Natbrainlab, Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, King's College London, UK
| | - Clémence Bourlon
- 2 Service de Médecine Physique et Réadaptation, Unité de Rééducation Neurologique CRF 'Les Trois Soleils' Boissise le Roi, France
| | - Christophe Duret
- 2 Service de Médecine Physique et Réadaptation, Unité de Rééducation Neurologique CRF 'Les Trois Soleils' Boissise le Roi, France
| | - Raffaella Migliaccio
- 1 INSERM U 1127, CNRS UMR 7225, Sorbonne Universités, and Université Pierre et Marie Curie-Paris 6, UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013 Paris, France 5 AP-HP, Department of Neurology, IFR 70, Salpêtrière Hospital, Paris, France
| | - Gilles Rode
- 3 Inserm UMR_S 1028, CNRS UMR 5292, ImpAct, centre des neurosciences de Lyon, université Lyon-1, 16, avenue Lépine 69676 Bron, France 6 Service de médecine physique et réadaptation neurologique, hospital Henry-Gabrielle, hospice civils de Lyon, 20, route de Vourles, Saint-Genis-Laval, France
| | - Paolo Bartolomeo
- 1 INSERM U 1127, CNRS UMR 7225, Sorbonne Universités, and Université Pierre et Marie Curie-Paris 6, UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013 Paris, France 5 AP-HP, Department of Neurology, IFR 70, Salpêtrière Hospital, Paris, France 7 Department of Psychology, Catholic University, Milan, Italy
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