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Approximately 2% to 10% of all patients with Alzheimer's disease have mirrored-self misidentification. [2] Patients with schizophrenia , right frontal ischemic stroke, [ 2 ] and rarely patients with Parkinson's disease [ 6 ] have also reported being affected by this delusion.
Clonal pluralization of the self, where a person believes there are multiple copies of themselves, identical both physically and psychologically, but physically separate and distinct. [11] Clinical lycanthropy is the belief that one is turning or has turned into an animal. It is considered a delusional misidentification of the self. [12]
The Capgras delusion is classified as a delusional misidentification syndrome, a class of beliefs that involves the misidentification of people, places, or objects. [2] It can occur in acute, transient, or chronic forms. Cases in which patients hold the belief that time has been "warped" or "substituted" have also been reported. [3]
The term reduplicative paramnesia was first used in 1903 by psychiatrist Arnold Pick to describe a condition in a patient with suspected Alzheimer's disease who insisted that she had been moved from Pick's city clinic to one she claimed looked identical but was in a familiar suburb. To explain the discrepancy she further claimed that Pick and ...
Little detail is known about the specific causes of delusional companion syndrome. It is thought that damage to the neocortex may be the direct cause of this psychosis. . Shanks and Venneri (2002) found unique and abnormal blood flow centred in the right parietal lobe of three patients with Alzheimer's dis
Intermetamorphosis is a delusional misidentification syndrome, related to agnosia. The main symptoms consist of patients believing that they can see others change into someone else in both external appearance and internal personality. [1] The disorder is usually comorbid with neurological disorders or mental disorders.
Delusional disorders are uncommon in psychiatric practice, though this may be an underestimation due to the fact that those with the condition lack insight and thus avoid psychiatric assessment. The prevalence of this condition stands at about 24 to 30 cases per 100,000 people while 0.7 to 3.0 new cases per 100,000 people are reported every year.
[9] [20] A patient can simultaneously suffer from Fregoli delusion for both persons and environments. In some cases, the patient holds the belief that they exist in both the correct and an incorrect location, a delusion that has been termed reduplicative paramnesia; the latter being a variant of the delusional misidentification syndromes. [9]