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Dual-Task Stroop Paradigm for Detecting Cognitive Deficits in High-Functioning Stroke Patients
Published on: December 16, 2022
Underestimation of cognitive impairments by the Montreal Cognitive Assessment (MoCA) in an acute stroke unit
Edgar Chan1, Sabah Khan1, Rupert Oliver1
1National Hospital for Neurology and Neurosurgery, London, UK.
Background And Purpose:
The Montreal Cognitive Assessment (MoCA) is an increasingly popular clinical screening tool for detecting cognitive impairment in stroke, but few studies have directly compared performance on the MoCA with neuropsychological assessment. Our retrospective study examined the extent to which intact performance on the MoCA reflects intact cognition as determined by neuropsychological assessment.
Methods:
In this retrospective study, cognitive profiles for 136 acute stroke patients admitted to the Acute Stroke Unit who had available MoCA and neuropsychological assessment data were examined.
Results:
22% of our patients were deemed cognitively intact on the MoCA. Of these, 78% were found to be impaired (≤ 5%ile) on neuropsychological assessment in one or more cognitive domains. The most common impairments were in general intelligence, information processing speed and visual memory; three areas not assessed by the MoCA. In addition, a high proportion (up to 59%) of patients who scored the maximum points in one of the MoCA-specified domains were impaired on comparable neuropsychological assessment.
Conclusions:
Our findings suggest that although the MoCA may be a useful screening tool post-stroke in detecting gross impairments, neuropsychological assessment is still necessary for a comprehensive and reliable detection of domain-specific cognitive deficits, which can more reliably inform us for realistic goal setting and vocational advice vital for effective rehabilitation.
Insights
The Montreal Cognitive Assessment (MoCA) may miss cognitive deficits in stroke patients. Neuropsychological assessment remains crucial for comprehensive evaluation and effective rehabilitation planning.
Area of Science:
- Neurology
- Neuropsychology
- Cognitive Science
Background:
- The Montreal Cognitive Assessment (MoCA) is widely used for cognitive impairment screening in stroke patients.
- Limited research directly compares MoCA performance with detailed neuropsychological assessments.
Purpose of the Study:
- To evaluate how well intact MoCA performance correlates with overall cognitive function determined by neuropsychological assessment in acute stroke patients.
- To identify cognitive domains where MoCA may not accurately reflect impairment.
Main Methods:
- Retrospective analysis of cognitive data from 136 acute stroke patients.
- Comparison of Montreal Cognitive Assessment (MoCA) scores with comprehensive neuropsychological assessment results.
Main Results:
- 22% of patients appeared cognitively intact on MoCA, yet 78% showed impairment in neuropsychological tests.
- Commonly missed impairments included general intelligence, processing speed, and visual memory.
- Significant impairment was noted in up to 59% of patients who achieved maximum scores in specific MoCA domains.
Conclusions:
- The MoCA is useful for detecting gross cognitive deficits post-stroke.
- Comprehensive neuropsychological assessment is essential for identifying domain-specific deficits.
- Accurate cognitive assessment informs realistic goal setting and vocational advice for stroke rehabilitation.
