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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7469957 | PMC |
| http://dx.doi.org/10.1176/appi.neuropsych.19010017 | DOI Listing |
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Center for Studies of Addiction, Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Incidence of opioid-related overdoses in the United States has increased dramatically over the past two decades. Despite public emphasis on overdose fatalities, most overdose cases are not fatal. Although there are case reports of amnestic syndromes and acute injury to the hippocampus following non-fatal opioid overdose, the effects of such overdoses on brain structure are poorly understood.
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Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts.
Since 2012, individuals with a history of opioid misuse have infrequently been observed to develop a sudden-onset amnestic syndrome associated with bilateral hippocampal-restricted diffusion on MRI. Follow-up imaging of this opioid-associated amnestic syndrome (OAS) has revealed persistent hippocampal abnormalities. Given these observations, as well as neuropathological studies demonstrating excessive tau deposition in the hippocampi and other brain regions of individuals with opioid misuse, we describe longitudinal imaging of a patient with a history of OAS from presentation through 53 months later, when tau positron emission tomography (PET) was performed.
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Family and Community Medicine, Western Michigan University Homer Stryker M.D. School of Medicine, Kalamazoo, USA.
Opioid-associated amnestic syndrome (OAS) is a relatively new condition that is associated with opioid abuse and has increased in prevalence since the notable rise in opioid-related deaths and opioid-related hospitalizations of the opioid crisis. Patients often present with acute anterograde amnesia and current opioid abuse, most commonly fentanyl. OAS is frequently diagnosed when other potentially infectious or metabolic conditions such as encephalitis and seizures are ruled out, as these conditions can also present similarly to OAS.
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Opioid-associated amnestic syndrome observed with fentanyl patch use.
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Department of Clinical Neurological Sciences (Taylor, Budhram, Lee, Mirsattari), and Division of Radiology (Lee), Western University, London, Ont.