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Individual differences |
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Pseudodementia is a syndrome seen in older people in which they exhibit symptoms consistent with dementia but the cause is a pre-existing psychiatric illness rather than a degenerative one. The name is derived from the Ancient Greek prefix pseudo- "false", prepended to dementia.
Older people with predominant cognitive symptoms such as loss of memory, and vagueness, as well as prominent slowing of movement and reduced or slowed speech, were sometimes misdiagnosed as having dementia when further investigation showed they were suffering from a major depressive episode. This was an important distinction as the former was untreatable and progressive and the latter treatable with antidepressant therapy or electroconvulsive therapy or both.
Doubts about the classification and features of the syndrome, and the misleading nature of the name, led to proposals that the term be dropped. However, proponents argue that although it is not a defined singular concept with a precise set of symptoms, it is a practical and useful term which has held up well in clinical practice, and also highlights those who may have a treatable condition.
The history of disturbance in pseudodementia is often short and abrupt onset, while dementia is more often insidious. Clinically, people with pseudodementia differ from those with true dementia when their memory is tested. They will often answer that they don't know the answer to a question, and their attention and concentration are often intact, and they may appear upset or distressed. Those with true dementia will often give wrong answers, have poor attention and concentration, and appear indifferent or unconcerned.
Investigations such as SPECT imaging of the brain show reduced blood flow in areas of the brain in people with Alzheimer's Disease, compared with a more normal blood flow in those with pseudodementia.
- ↑ Sachdev, Perminder, J S Smith, H Angus-Lepan, P Rodriguez (1990). Pseudodementia twelve years on. J Neurol Neurosurg Psychiatry 53 (3): 254–59.
- ↑ Caine, E.D. (1981). Pseudodementia. Current concepts and future directions. Archives of General Psychiatry 38 (12): 1359–64.
- ↑ Kiloh, Leslie Gordon (1961). Pseudodementia. Acta Psychiatr Scand. 37: 336–51.
- ↑ McAllister, TW (May 1983). Overview: Pseudodementia. American Journal of Psychiatry 140 (5): 528–33.
- ↑ Poon, Leonard W. (1991). abstract Toward an understanding of cognitive functioning in geriatric depression. International Psychogeriatrics 4 (4): 241–66.
- ↑ Sachdev, Perminder & Reutens, Sharon (2003). "The Nondepressive Pseudodementias" V. Olga B. Emery, Thomas E. Oxman Dementia: Presentations, Differential Diagnosis, and Nosology, p. 418, JHU Press.
- ↑ Wells, CE (May 1979). Pseudodementia. American Journal of Psychiatry 136 (7): 895–900.
- ↑ Parker, Gordon; Dusan Hadzi-Pavlovic, Kerrie Eyers (1996). Melancholia: A disorder of movement and mood: A phenomenological and neurobiological review, pp. 273–74, Cambridge: Cambridge University Press.