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Frontal MRI findings associated with impairment on the Executive Interview (EXIT25)
D R Royall1, R Rauch, G C Román
1Departments of Psychiatry, Medicine, and Pharmacology, South Texas Veterans' Health System, Geriatric Research, Education and Clinical Center (GRECC), University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA. royall@uthscsa.edu
Abstract:
We examined the association between the Executive Interview (EXIT25), a bedside measure of executive control, and regional magnetic resonance imaging (MRI) pathology among 52 consecutive geriatric patients presenting to a university dementia assessment clinic. Left frontal (p < .002), left medial (p < .03), right frontal (p < .02), and right medial (p < .02) cortical lesions significantly worsened EXIT25 scores, even after adjusting for age, global cognitive impairment (on the Mini-Mental State Examination), and the severity of cortical dementia on the Qualitative Evaluation of Dementia [QED]. The EXIT25's associations with right hemisphere lesions did not persist after adjusting for left frontal lesions. Left posterior lesions did not significantly affect the EXIT25. Similarly, left frontal circuit pathology worsened EXIT25 scores (p < .05). Pathology in left anterior subcortical structures showed a trend (p = .052). EXIT25 scores were not affected by right subcortical pathology, nor by pathology in either hippocampus. We conclude that the EXIT25 is specifically affected by frontal system MRI lesions, particularly on the left. This conclusion is consistent with earlier functional neuroimaging studies associating EXIT25 performance with left mesiofrontal perfusion.
Insights
The Executive Interview (EXIT25) is significantly impacted by frontal lobe lesions, particularly on the left side. This bedside test effectively measures executive control deficits linked to specific brain MRI findings in older adults.
Area of Science:
- Neurology
- Geriatrics
- Neuroimaging
Background:
- Executive dysfunction is a key feature of cognitive decline in aging.
- Bedside cognitive assessments are crucial for early detection and diagnosis.
- Magnetic Resonance Imaging (MRI) provides detailed structural brain information.
Purpose of the Study:
- To investigate the association between the Executive Interview (EXIT25) and regional MRI-detected brain pathology.
- To determine if specific lesion locations correlate with EXIT25 performance in geriatric patients.
Main Methods:
- A cohort of 52 geriatric patients from a university dementia clinic was studied.
- Regional MRI pathology was assessed and correlated with EXIT25 scores.
- Statistical analyses adjusted for age, global cognitive impairment (MMSE), and dementia severity (QED).
Main Results:
- Left frontal and medial cortical lesions significantly worsened EXIT25 scores.
- Left frontal circuit pathology also negatively impacted EXIT25 performance.
- Associations with right hemisphere lesions were not independent of left frontal findings; posterior lesions and hippocampal pathology had no significant effect.
Conclusions:
- The EXIT25 is specifically sensitive to frontal lobe MRI lesions, especially on the left.
- Findings support the EXIT25's utility in assessing executive control deficits related to frontal system pathology.
- Results align with prior functional neuroimaging studies linking EXIT25 to left mesiofrontal brain activity.