Reversible functional connectivity disturbances during transient global amnesia
Objective Transient global amnesia (TGA), an abrupt occurrence of severe anterograde episodic amnesia accompanied by repetitive questioning, has been known for more than 50 years. Despite extensive research, there is no clear evidence for the underlying pathophysiological basis of TGA. Moreover, the...
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Published in | Annals of neurology Vol. 75; no. 5; pp. 634 - 643 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Blackwell Publishing Ltd
01.05.2014
Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | Objective
Transient global amnesia (TGA), an abrupt occurrence of severe anterograde episodic amnesia accompanied by repetitive questioning, has been known for more than 50 years. Despite extensive research, there is no clear evidence for the underlying pathophysiological basis of TGA. Moreover, there is no neuroimaging method to evaluate TGA in real time.
Methods
Here we used resting‐state functional magnetic resonance imaging recorded in 12 patients during the acute phase of TGA together with connectivity and cluster analyses to detect changes in the episodic memory network in TGA.
Results
Our results show a significant reduction in functional connectivity of the episodic memory network during TGA, which is more pronounced in the hyperacute phase than in the postacute phase. This disturbance is bilateral, and reversible after recovery. Although the hippocampus and its connections are significantly impaired, other parts of the episodic memory network are also impaired. Similar results were obtained for the analysis of the episodic memory network whether it was defined in a data‐driven or literature‐based manner.
Interpretation
These results suggest that TGA is related to a functional disturbance in the episodic memory network, and supply a neuroimaging correlate of TGA during the acute phase. Ann Neurol 2014;75:634–643 |
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Bibliography: | ArticleID:ANA24137 ark:/67375/WNG-NS20K2PB-D Marie Curie Intra-European Fellowship within the framework of the EU-FP7 program istex:9C491F4599F018DE373FD1526C4C12F86A97C161 Ministry of Science and Technology, Israel; and the Swiss Institute of Technology (EPFL) Hebrew University Brain Collaboration German-Israeli Foundation for Scientific Research and Development (GIF) MRI unit and Neurology department of Hadassah Hebrew University Medical Center for their help in patients' management ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1 |
ISSN: | 0364-5134 1531-8249 |
DOI: | 10.1002/ana.24137 |