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Kim BS, Cho SS, Choi JY, Kim YH. Transient global amnesia: a study with Tc-99m ECD SPECT shortly after symptom onset and after recovery. Diagn Interv Radiol 2017; 22:476-80. [PMID: 27535207 DOI: 10.5152/dir.2016.15487] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
PURPOSE Transient global amnesia (TGA) is characterized by sudden loss of memory of recent events, transient inability to retain new information, and retrograde amnesia. We investigated the changes of regional cerebral blood flow in patients with TGA shortly after symptom onset and after recovery using Tc-99m-ethyl cysteinate dimer single-photon emission computed tomography (Tc-99m ECD SPECT) and statistical parametric mapping (SPM) analysis. METHODS Six right-handed patients with TGA were studied using Tc-99m ECD SPECT shortly after symptom onset and after recovery. As a control group, six healthy individuals were also studied. Images were analyzed using SPM8 using voxel-based analysis to estimate the differences between TGA patients and controls. RESULTS There was significant hypoperfusion in the left hippocampus, left thalamus, and bilateral cerebellum. In the follow-up SPECT scan, hypoperfusion in hippocampus and thalamus were restored, while hypoperfusion was noted in the temporoparietal region. CONCLUSION Our results suggest that the underlying mechanism of TGA may be temporary ischemia in the hippocampus and thalamus. There was significant restoration of perfusion in the hippocampus and thalamus after recovery from TGA.
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Affiliation(s)
- Bom Sahn Kim
- Department of Nuclear Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
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Quinette P, Constans JM, Hainselin M, Desgranges B, Eustache F, Viader F. Hippocampal modifications in transient global amnesia. Rev Neurol (Paris) 2015; 171:282-8. [PMID: 25769554 DOI: 10.1016/j.neurol.2015.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 01/28/2015] [Indexed: 10/23/2022]
Abstract
Transient global amnesia (TGA) is an acute and transient syndrome with a remarkably stereotypical set of signs and symptoms. It is characterized by the abrupt onset (no forewarning) of massive episodic memory impairment, both anterograde and retrograde. Ever since it was first described, TGA has fascinated neurologists and other memory experts, and in recent years, there has been a surge of neuroimaging studies seeking to pin down the brain dysfunction responsible for it. Several pathophysiological hypotheses have been put forward, including the short-lived suggestion of an epileptic mechanism. All the available data indicate that the brain modifications are reversible, and that the mechanism behind TGA is of a functional nature. However, while diffusion-weighted imaging studies have clearly identified the hippocampus and, more specifically, the CA1 area, as the locus of brain modifications associated with TGA, researchers have yet to determine whether the origin of the mechanism is vascular or neurochemical. Spectroscopy may provide a means of settling this issue once and for all.
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Affiliation(s)
- P Quinette
- U1077, Inserm, 5, avenue de la Côte-de-Nacre, CS 30001, 14033 Caen Cedex 9, France; UMR-S1077, University of Caen - Basse-Normandie, esplanade de la Paix, 14032 Caen Cedex 5, France; UMR-S1077, École Pratique des Hautes Études, 5, avenue de la Côte-de-Nacre, 14032 Caen Cedex 5, France; U1077, Caen University Hospital, 5, avenue de la Côte-de-Nacre, 14033 Caen Cedex 9, France
| | - J M Constans
- Radiology and Medical Imaging Department, Amiens University Hospital, place Victor-Pauchet, 80054 Amiens Cedex 1, France
| | - M Hainselin
- U1077, Inserm, 5, avenue de la Côte-de-Nacre, CS 30001, 14033 Caen Cedex 9, France; UMR-S1077, University of Caen - Basse-Normandie, esplanade de la Paix, 14032 Caen Cedex 5, France; UMR-S1077, École Pratique des Hautes Études, 5, avenue de la Côte-de-Nacre, 14032 Caen Cedex 5, France; U1077, Caen University Hospital, 5, avenue de la Côte-de-Nacre, 14033 Caen Cedex 9, France; CRPCPO, EA 7273, University of Picardie Jules Verne, chemin du Thil, 80000 Amiens, France
| | - B Desgranges
- U1077, Inserm, 5, avenue de la Côte-de-Nacre, CS 30001, 14033 Caen Cedex 9, France; UMR-S1077, University of Caen - Basse-Normandie, esplanade de la Paix, 14032 Caen Cedex 5, France; UMR-S1077, École Pratique des Hautes Études, 5, avenue de la Côte-de-Nacre, 14032 Caen Cedex 5, France; U1077, Caen University Hospital, 5, avenue de la Côte-de-Nacre, 14033 Caen Cedex 9, France
| | - F Eustache
- U1077, Inserm, 5, avenue de la Côte-de-Nacre, CS 30001, 14033 Caen Cedex 9, France; UMR-S1077, University of Caen - Basse-Normandie, esplanade de la Paix, 14032 Caen Cedex 5, France; UMR-S1077, École Pratique des Hautes Études, 5, avenue de la Côte-de-Nacre, 14032 Caen Cedex 5, France; U1077, Caen University Hospital, 5, avenue de la Côte-de-Nacre, 14033 Caen Cedex 9, France.
| | - F Viader
- U1077, Inserm, 5, avenue de la Côte-de-Nacre, CS 30001, 14033 Caen Cedex 9, France; UMR-S1077, University of Caen - Basse-Normandie, esplanade de la Paix, 14032 Caen Cedex 5, France; UMR-S1077, École Pratique des Hautes Études, 5, avenue de la Côte-de-Nacre, 14032 Caen Cedex 5, France; U1077, Caen University Hospital, 5, avenue de la Côte-de-Nacre, 14033 Caen Cedex 9, France; Neurology Department, Caen University Hospital, avenue de la Côte-de-Nacre, 14033 Caen Cedex 9, France
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Senaha MLH, Caramelli P, Brucki SMD, Smid J, Takada LT, Porto CS, César KG, Matioli MNP, Soares RT, Mansur LL, Nitrini R. Primary progressive aphasia: classification of variants in 100 consecutive Brazilian cases. Dement Neuropsychol 2013; 7:110-121. [PMID: 29213827 PMCID: PMC5619553 DOI: 10.1590/s1980-57642013dn70100017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Primary progressive aphasia (PPA) is a neurodegenerative clinical syndrome
characterized primarily by progressive language impairment. Recently, consensus
diagnostic criteria were published for the diagnosis and classification of
variants of PPA. The currently recognized variants are nonfluent/agrammatic
(PPA-G), logopenic (PPA-L) and semantic (PPA-S).
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Affiliation(s)
- Mirna Lie Hosogi Senaha
- PhD, Member of Behavioral and Cognitive Neurology Unit of Department of Neurology, University of São Paulo School of Medicine, São Paulo SP, Brazil
| | - Paulo Caramelli
- MD, PhD, Professor, Department of Internal Medicine, Faculty of Medicine, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais MG, Brazil
| | - Sonia M D Brucki
- MD, PhD, Member of Behavioral and Cognitive Neurology Unit of Department of Neurology, University of São Paulo School of Medicine, São Paulo SP, Brazil
| | - Jerusa Smid
- MD, PhD, Member of Behavioral and Cognitive Neurology Unit of Department of Neurology, University of São Paulo School of Medicine, São Paulo SP, Brazil
| | - Leonel T Takada
- MD, Member of Behavioral and Cognitive Neurology Unit of Department of Neurology, University of São Paulo School of Medicine, São Paulo SP, Brazil
| | - Claudia S Porto
- PhD, Member of Behavioral and Cognitive Neurology Unit of Department of Neurology, University of São Paulo School of Medicine, São Paulo SP, Brazil
| | - Karolina G César
- MD, Member of Behavioral and Cognitive Neurology Unit of Department of Neurology, University of São Paulo School of Medicine, São Paulo SP, Brazil
| | - Maria Niures P Matioli
- MD, Member of Behavioral and Cognitive Neurology Unit of Department of Neurology, University of São Paulo School of Medicine, São Paulo SP, Brazil
| | - Roger T Soares
- MD, Member of Behavioral and Cognitive Neurology Unit of Department of Neurology, University of São Paulo School of Medicine, São Paulo SP, Brazil
| | - Letícia L Mansur
- PhD, Member of Behavioral and Cognitive Neurology Unit of Department of Neurology, University of São Paulo School of Medicine, São Paulo SP, Brazil
| | - Ricardo Nitrini
- MD, PhD, Professor, Department of Neurology, University of São Paulo School of Medicine, São Paulo SP, Brazil
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