Transient global amnesia with post-hyperventilation temporal sharp waves—A case report

Jeong, Hye Seon; Moon, Jeong Soo; Baek, In Chul; Lee, Ae Young; Kim, Jae-Moon

doi:10.1016/j.seizure.2010.09.002

Cited by 9 publications

(4 citation statements)

References 16 publications

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“…2,4 The exact pathogenesis of TGA is still unknown. 5 Although several etiopathophysiological mechanisms, such as migrainerelated mechanisms, hypoxic-ischemic events, 6 jugular vein valve incompetence, 7,8 and epilepsy-related activity, 9 have been argued to be associated with this syndrome, none of them seems to fully explain this condition.…”

Section: Introductionmentioning

confidence: 99%

Abnormal EEG Power Spectra in Acute Transient Global Amnesia: A Quantitative EEG Study

et al. 2018

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Transient global amnesia (TGA) is a clinical syndrome characterized by retrograde and anterograde amnesia without other neurological deficits. Although electroencephalography (EEG) methods are commonly used in both clinical and research setting with TGA patients, few studies have investigated neurophysiological pattern in TGA using quantitative EEG (qEEG). The main aim of the present study was to extend these previous findings by exploring EEG power spectra differences between patients with acute TGA and healthy controls using the exact low-resolution brain electromagnetic tomography software (eLORETA). EEG was recorded during 5 minutes of resting state. Sixteen patients (mean age: 66.81 ± 7.94 years) during acute TGA and 16 healthy subjects were enrolled. All patients showed hippocampal or parahippocampal signal abnormalities in diffusion-weighted magnetic resonance imaging performed from 2 to 5 days after the onset of TGA. Compared with healthy controls, TGA patients showed a decrease of theta power localized in the temporal lobe (Brodmann areas, BAs 21-22-38) and frontal lobe (BAs 8-9-44-45). A decrease of EEG beta power in the bilateral precuneus (BA 7) and in the bilateral postcentral gyrus (BAs 3-4-5) was also observed in TGA individuals. Taken together, our results could reflect the neurophysiological substrate of the severe impairment of both episodic memory and autobiographical memory which affect TGA patients during the acute phase.

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Section: Introductionmentioning

confidence: 99%

Abnormal EEG Power Spectra in Acute Transient Global Amnesia: A Quantitative EEG Study

et al. 2018

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“…This is most commonly described around cold water immersion (recreational, experimental or reason undocumented),20–24 as well a case documenting TGA following exposure to cryotherapy (extremely cold dry air),25 and a case while sailing in the rain 26. Another case is described of an individual experiencing TGA after swimming underwater, having held their breath for 1 min (intentionally, without near-drowning) 27. However, the nature and temperature of the water body are not disclosed and the case considered to be secondary to hypoxia by the authors.…”

Section: Discussionmentioning

confidence: 99%

Case of transient global amnesia-like syndrome after recreational cold-water swimming

2023

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We document a case of a transient global amnesia (TGA)-like syndrome following open water swimming. This case was atypical for TGA, in that symptoms were prolonged and ischaemic infarct was considered within the differential. MRI did not demonstrate any changes associated with acute ischaemia although did show a mild degree of small vessel change. With amnesia taking greater than 24 hours to resolve, we have labelled this case to be a TGA-like syndrome, provoked by the commonly reported TGA precipitant of cold water immersion. The possibility of a tiny, strategic infarct causing these symptoms was considered and antiplatelet therapy commenced.

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“…With the termination of the clinical picture, there is a simultaneous decline of the non-specific EEG findings. 6…”

Section: Electroencephalographic (Eeg) Findings In Patients With Tgamentioning

confidence: 99%

“…With the termination of the clinical picture, there is a simultaneous decline of the non-specific EEG findings. 6 YooSeok Kwon et al, in their paper titled "'Left dominance of EEG abnormalities in patients with transient global amnesia"" published a table which presents the total electroencephalographic findings found by other researchers in patients with TGA. A number of 707 patients were studied.…”

Section: Electroencephalographic (Eeg) Findings In Patients With Tgamentioning

confidence: 99%

Neuroimaging and Electroencephalographic Correlation in Patients with Transient Global Amnesia: Clinical Case Series

et al. 2022

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Objective. To determine if there is any correlation between the electroencephalographic and neuroimaging findings in patients with Transient Global Amnesia (TGA). Methods: We retrospectively reviewed files of the First Department of Neurology of AHEPA University Hospital, including patients with a clinical diagnosis of TGA. Only patients who had the characteristic high signal in the temporal lobes in the DWI MRI and those who underwent electroencephalographic recording (EEG) were selected. Results: Out of 28 patients, 8 were selected. We found that 6 out of 8 patients (75%) who had imaging findings in DWI, in at least one medial temporal lobe, also had had intermittent slow theta waves on the electroencephalographic recording. Of these 6 patients, 3 (50%) had bilateral EEG findings, 2 patients (33,3%) only had findings on the left hemisphere and 1 (17%) had on the right hemisphere. 3 out of 6 patients (50%) had electroencephalographic dominance on the left, while 2 out of the 6 (33%) had on the right. In 2 patients with imaging findings in DWI no anomalies were demonstrated on EEG. In 3 out of 8 patients, both MRI and EEG findings correlated on the same side, while 1 patient had opposite findings, depending on which hemisphere the EEG anomalies dominated. Conclusions: There is no absolute matching between the DWI MRI and EEG findings in patients with the clinical diagnosis of TGA. However, there is some degree of correlation, when we focus on the focal dominance of the EEG anomalies, although not statistically significant.

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Transient global amnesia with post-hyperventilation temporal sharp waves—A case report

Cited by 9 publications

References 16 publications

Abnormal EEG Power Spectra in Acute Transient Global Amnesia: A Quantitative EEG Study

Abnormal EEG Power Spectra in Acute Transient Global Amnesia: A Quantitative EEG Study

Case of transient global amnesia-like syndrome after recreational cold-water swimming

Neuroimaging and Electroencephalographic Correlation in Patients with Transient Global Amnesia: Clinical Case Series

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