anterograde amnesia
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BMC Neurology ◽  
2022 ◽  
Vol 22 (1) ◽  
Author(s):  
Eckhard Schlemm ◽  
Tim Magnus ◽  
Leander D. Rimmele ◽  
Justine Münsterberg ◽  
Maxim Bester ◽  
...  

Abstract Background We report the case of a patient with recurrent episodes of disturbed memory suggestive of transient epileptic amnesia, and a focal hippocampal lesion typically associated with transient global amnesia. We argue how careful consideration of clinical, electrophysiological and imaging findings can resolve this apparent contradiction and lead to a diagnosis of early symptomatic post-stroke seizures that links brain structure to function in a new, clinically relevant way. Case presentation A 70-year-old patient was identified in clinical practice in our tertiary care centre and was evaluated clinically as well as by repeated electroencephalography and magnetic resonance imaging. The presenting complaint were recurrent episodes of short-term memory disturbance which manifested as isolated anterograde amnesia on neurocognitive evaluation. EEG and MRI revealed predominantly right frontotemporal spikes and a punctate diffusion-restricted lesion in the left hippocampus, respectively. Both symptoms and EEG changes subsided under anticonvulsant treatment with levetiracetam. Conclusions Our report contributes to the current discussion of clinical challenges in the differential diagnosis of transient memory disturbance. It suggests that focal diffusion-restricted hippocampal lesions, as seen in TGA, might be ischemic and thus highlights the importance of considering post-stroke seizures as a possible cause of transient memory disturbance.


Author(s):  
Mehrdad Masoudifar ◽  
Behzad Nazemroaya ◽  
Maryam Raisi

Background: One of the complications of ECT treatment is headache. There is a need to use sedation during ECT. As a result, midazolam has been used to address a safe and effective strategy in this regard. Methods: This study is a double-blind clinical trial that has been performed in three groups: group A, which receives midazolam based on the usual regimen, group B, which receives midazolam after shock, and group C, which is the control group. Patients were asked about headache, nausea, and muscle aches during the recovery time, seizure duration and after becoming fully conscious. Data were analyzed in the PASW version18 software using analysis of variance and repeated measurement tests, ANOVA, independed t and χ2 tests. Results: Analysis showed that the frequency of muscle pain after full consciousness in group C was significantly higher than group B, with group B being higher than group A. χ2 test showed that the frequency of headache, cough and nausea in group C was significantly higher than the two groups A and B. Conclusion: The result of this research showed that midazolam prodrug plays an effective role in preventing post-ECT complications in children. The effect of midazolam before and after ECT on headache, muscle pain and nausea was investigated and compared with the control group. Also, due to its anterograde amnesia, midazolam can reduce the patient's stress in the next visits, and this issue is even more important when the patient is a child.


2021 ◽  
Vol 15 ◽  
Author(s):  
Dirk Montag

Retrograde amnesia is the inability to remember events or information. The successful acquisition and memory of information is required before retrograde amnesia may occur. Often, the trigger for retrograde amnesia is a traumatic event. Loss of memories may be caused in two ways: either by loss/erasure of the memory itself or by the inability to access the memory, which is still present. In general, memories and learning are associated with a positive connotation although the extinction of unpleasant experiences and memories of traumatic events may be highly welcome. In contrast to the many experimental models addressing learning deficits caused by anterograde amnesia, the incapability to acquire new information, retrograde amnesia could so far only be investigated sporadically in human patients and in a limited number of model systems. Apart from models and diseases in which neurodegeneration or dementia like Alzheimer’s disease result in loss of memory, retrograde amnesia can be elicited by various drugs of which alcohol is the most prominent one and exemplifies the non-specific effects and the variable duration. External or internal impacts like traumatic brain injury, stroke, or electroconvulsive treatments may similarly result in variable degrees of retrograde amnesia. In this review, I will discuss a new genetic approach to induce retrograde amnesia in a mouse model and raise the hypothesis that retrograde amnesia is caused by altered intracellular calcium homeostasis. Recently, we observed that neuronal loss of neuroplastin resulted in retrograde amnesia specifically for associative memories. Neuroplastin is tightly linked to the expression of the main Ca2+ extruding pumps, the plasma membrane calcium ATPases (PMCAs). Therefore, neuronal loss of neuroplastin may block the retrieval and storage of associative memories by interference with Ca2+ signaling cascades. The possibility to elicit retrograde amnesia in a controlled manner allows to investigate the underlying mechanisms and may provide a deeper understanding of the molecular and circuit processes of memory.


2021 ◽  
Author(s):  
Léa Herbulot ◽  
Chloé Bost ◽  
Agnès Viguier ◽  
Nathalie Faure-Marie ◽  
Eloïse Baudou ◽  
...  

AbstractAntiglutamic acid decarboxylase (GAD65) encephalitis is rare and few pediatric cases have been reported, with variable clinical presentations. A 14-year-old female adolescent was managed in our department. She had been treated for several months for drug-resistant temporal lobe epilepsy and gradually presented major anterograde amnesia with confusion. Upon her arrival at the University Hospital Centre, she showed a classical form of stiff person syndrome. The brain magnetic resonance imaging showed bitemporal hyperintensities and hypertrophy of the amygdala. The blood and cerebrospinal fluid were positive for GAD65 antibodies. At 2 years of immunosuppressive treatment and rehabilitation, the course showed partial improvement of the memory and neuropsychiatric impairment, and epilepsy that continued to be active. GAD65 antibodies are associated with various neurological syndromes, and this presentation combining limbic encephalitis and stiff person syndrome is the first pediatric form published to date; there are also few cases described in adults.


2021 ◽  
Author(s):  
Svetlana Solntseva ◽  
Vladimir Nikitin ◽  
Sergey Kozyrev ◽  
Pavel Nikitin

Abstract Previously, we found that impairment of conditioned food aversion memory consolidation or reconsolidation in snails by NMDA glutamate receptors antagonists led to the induction of amnesia changing over time. In particular, at the later amnesia stages (10 or more days), repeated aversion training for the same food type that was used in the initial training did not induce long-term memory formation. In these animals, long-term aversion memory for a new food type was formed. We characterized this amnesia as specific anterograde amnesia. In the present work, using DNA methyltransferases (DNMT) inhibitors, the DNA methylation processes role in mechanisms of anterograde amnesia and recovery from amnesia was investigated. It was found that in amnestic animals, DNMT inhibitor administration before or after repeated training led to the rapid long-term conditioned food aversion memory formation. It depended on proteins and mRNA synthesis at certain time windows. Thus, protein synthesis inhibitors administration before or immediately after repeated training, or RNA synthesis inhibitor injection after training, prevented memory formation induced by the DNMT inhibitor. The effects of DNMT inhibitors were specific for certain conditioned stimulus, since these inhibitors did not affect amnestic animals training for a new food stimulus. DNMT inhibition during second training removed blockade of these genes' expression, opening up access to them for transcription factors synthesized during training. Thus, this work was the first to study the molecular mechanisms of anterograde amnesia, as well as memory recovery, which can be important for search for pharmacological correction of this neuropsychic pathology.


2021 ◽  
Vol 12 ◽  
Author(s):  
Xingyi Zhao ◽  
Minpeng Ji ◽  
Xin Wen ◽  
Dan Chen ◽  
Fu Huang ◽  
...  

BackgroundMidazolam is a neurological drug with diverse functions, including sedation, hypnosis, decreased anxiety, anterograde amnesia, brain-mediated muscle relaxation, and anticonvulsant activity. Since it is frequently used in children and adolescents for extended periods of time, there is a risk that it may affect their pubertal development. Here, we report a potential effect of the drug on the development of Leydig cells (LCs), the testosterone (T)-producing cells in the testis.MethodsStem LCs (SLCs), isolated from adult rat testes by a magnetic-activated cell sorting technique, were induced to differentiate into LCs in vitro for 3 weeks. Midazolam (0.1–30 μM) was added to the culture medium, and the effects on LC development were assayed.ResultsMidazolam has dose-dependent effects on SLC differentiation. At low concentrations (0.1–5 μM), the drug can mildly increase SLC differentiation (increased T production), while at higher concentrations (15–30 μM), it inhibits LC development (decreased T production). T increases at lower levels may be due to upregulations of scavenger receptor class b Member 1 (SCARB1) and cytochrome P450 17A1 (CYP17A1), while T reductions at higher levels of midazolam could be due to changes in multiple steroidogenic proteins. The uneven changes in steroidogenic pathway proteins, especially reductions in CYP17A1 at high midazolam levels, also result in an accumulation of progesterone. In addition to changes in T, increases in progesterone could have additional impacts on male reproduction. The loss in steroidogenic proteins at high midazolam levels may be mediated in part by the inactivation of protein kinase B/cAMP response element-binding protein (AKT/CREB) signaling pathway.ConclusionMidazolam has the potential to affect adult Leydig cell (ALC) development at concentrations comparable with the blood serum levels in human patients. Further studies are needed to test the effects on human cells.


Author(s):  
Stefano Terruzzi ◽  
Maurizia Chiusole ◽  
Donatella Ottaviani ◽  
Umberto Rozzanigo ◽  
Costanza Papagno
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2021 ◽  
Vol 14 (10) ◽  
pp. e245682
Author(s):  
Jinsoo Koh ◽  
Junko Taruya ◽  
Megumi Mori ◽  
Hidefumi Ito

Primary phlebitis of the central nervous system (PPCNS) is a rare condition that might be a subset of primary angiitis of the CNS. In this case report, the patient was a 39-year-old man with a 2-week history of anterograde amnesia and abnormal behaviours. Black-blood MRI (BB-MRI) showed contrast enhancement of the left basilar vein and cerebral superficial veins. Angiography showed unremarkable change in arteries. After a thorough differential diagnosis, we diagnosed PPCNS and then administered methylprednisolone pulse and cyclophosphamide pulse. The neuropsychological symptoms and MRI findings gradually improved, and after 2 months, the dose of prednisolone was gradually reduced to 20 mg. No recurrence was observed. This case shows that BB-MRI may be useful for diagnosing PPCNS.


2021 ◽  
pp. 095679762110074
Author(s):  
McKenna M. Garland ◽  
Jatin G. Vaidya ◽  
Daniel Tranel ◽  
David Watson ◽  
Justin S. Feinstein

Little is known about the role of declarative memory in the ongoing perception of one’s personality. Seven individuals who developed a rare and severe type of anterograde amnesia following damage to their medial temporal lobes were identified from our neurological patient registry. We examined the stability of their personality ratings on the Big Five Inventory over five retest periods and assessed the accuracy of their ratings via analyses of self–caregiver agreement. The patients portrayed a stable sense of self over the course of 1 year. However, their self-ratings differed from those provided by the caregivers. Intriguingly, these discrepancies diminished when caregivers retrospectively rated the patients’ personalities prior to their brain injury, suggesting that patients’ perceptions of themselves were stuck in the past. We interpret our findings to indicate that the ability to form new declarative memories is not required for maintaining a stable sense of self but may be important for updating one’s sense of self over time.


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