In particular, including FDG and amyloid PET biomarkers, which may help separate mild cognitive impairment subtypes (Prestia et al., 2013), and in due course tau-PET will be of considerable interest.
Our aims were to 1) detect the occurrence of three mild cognitive impairment (MCI) subtypes in the general population; 2) identify cases of cognitive impairment which are not detected by current operational criteria for MCI and; 3) determine the predictive value of the subtypes for identifying future Alzheimer disease (AD).
The early non-fluent language impairment of this subtype distinguishes it from the language syndrome of later stage typical AD, which is generally fluent in nature, with anomia, semantic paraphasias, progressing to surface dyslexia and jargon speech [ 30, 31].
Amnestic mild cognitive impairment (aMCI), a subtype of MCI, was conceptualized as significant episodic memory decline along with relatively preserved global cognition and intact activities of daily living [ 3, 4].
When there were fewer symptoms than required to fulfil the DSM-IV diagnoses (i.e., presence of only 3 5 of at least 6 criteria for either the hyperactive/impulsive or the inattentive subtypes), impairment had to be present in order for the child to be included.
AD: Alzheimer disease; A-MCI: anmestic subtype of mild cognitive impairment; MCI: mild cognitive impairment; VaD: vascular dementia; VCI: vascular cognitive impairment; VCIND: vascular cognitive impairment, no dementia.
By sorting the HRS subjects who have the ε4 gene into subtypes of impairment identified in Petersen's and Smith's work, the Cornell researchers were able to show a significant correlation the ε4 gene and risk of the Alzheimer's precondition, known as amnestic MCI (or a-MCI).
Systemic inflammation was associated with mild cognitive impairment (MCI) and its subtypes.
An imaging study might identify how the pattern of WM impairments associated with each subtype might or might not be linked to different neuroanatomy.
Cognitive function was assessed using the MMSE [ 9] and by classification based on definitions of mild cognitive impairment (MCI) and its subtypes [ 13].
In both subtypes, visual impairment is often one of the first symptoms, and retinal degeneration has been described in patients, but the cause and progression of visual deficits is not well understood [ 8– 11].
