Dementia Screening Accuracy is Robust to Premorbid IQ Variation: Evidence from the Addenbrooke's Cognitive Examination-III and the Test of Premorbid Function

Does the presence of chronic pain affect scores on cognitive screening tests/brief cognitive measures for dementia? A systematic review and meta-analysis

OBJECTIVE

Cognitive screening tests can identify potential dementia by indicating a concerning level of cognitive impairment. The older populations for whom this is most relevant are more likely to experience chronic pain, which also impairs cognitive function, but pain's impact on cognitive screening tests specifically remains unknown.

METHOD

We conducted a systematic review and meta-analysis (SR/MA) following PRISMA guidelines evaluating cognitive screening scores in studies involving participants with chronic pain compared with a pain-free control group. Our question was whether the presence of chronic pain (self-reported or based on diagnosis) was associated with poorer performance on these screens, and to identify the heterogeneity across groups and screens.

RESULTS

The 51 studies identified yielded 62 effect size estimates. The pooled g was 0.76 (95% confidence interval 0.57 to 0.95). Heterogeneity was high for the full model (= 93.16%) with some reductions in sub-analyses. Around half of the studies were identified as being at a low risk of bias. There was no evidence of publication bias.

CONCLUSIONS

As a whole, this analysis suggests medium to large effect sizes on cognitive screen performance when people are living with chronic pain. We suggest that clinicians should consider the effect of chronic pain when cognitive screens are employed to investigate dementia. Further research could clarify the effect pain has on different screen sub-domains to aid their effective use with these populations.

Utility of Chinese Versions of Addenbrooke’s Cognitive Examination: A Narrative Review

Addenbrooke’s cognitive examination (ACE) is a cognitive screening tool that has developed through three stages: ACE, ACE-Revised (ACE-R), and ACE-Ⅲ. In addition, mini-Addenbrooke’s Cognitive Examination (M-ACE) and ACE mobile are the additional versions that is derived from ACE-III. ACE and its related versions show better performance than Mini-Mental State Examination (MMSE) and Montreal Cognitive Assessment (MoCA) in detecting mild cognitive impairment in different neurological disorders. It has been translated into numerous languages, including Chinese. Through reviewing the history, validity, and comparison with other cognitive tests of Chinese versions of ACE, it aims to facilitate the clinical and scientific use, further development, improvement, and validation of Chinese versions of ACE in various neurological disorders and ultimately promote early identification and management of cognitive impairment in China.

Role of anxiety, depression and neurocognition for cognitive behavioural therapy pre-therapy skills in people living with dementia, older and younger adults✰

BACKGROUND

Anxiety and depression are common in people living with dementia (PLWD) and Cognitive behavioural therapy (CBT) seems to be one of the few efficacious interventions. However, PLWD's ability to engage with CBT has been questioned due to the presumed impact of neurocognitive impairment on core skills necessary to engage with CBT (pre-therapy skills). Here, we (i) compare CBT pre-therapy skills in PLWD to older and younger adults (OA, YA), (ii) examine potential confounders and mediators and (iii) explore associations of neurocognition, anxiety and depression with pre-therapy skills in PLWD.

METHODS

Pre-therapy skills were compared between PLWD (n = 102), OA (n = 77) and YA (n = 56). Structural equation modelling was used to assess mediators and confounders of differences in pre-therapy skills between groups. Spearman's rank correlations were used to examine the relationship of pre-therapy skills with neurocognition and mood in PLWD.

RESULTS

Group differences in pre-therapy skills were found, following the pattern YA>OA>PLWD. Neurocognition mediated the difference between OA and PLWD. In PLWD, language was associated with performance on all skills. There was little evidence that anxiety or depression contributed to variability in skill performance within PLWD.

LIMITATIONS

Cross-sectional design limited ability to ascertain cause and effect. Pre-therapy skill measures have not been used in the context of actual CBT; consequently, their relationship with CBT outcomes needs to be established.

CONCLUSIONS

PLWD may have a relative difficulty in CBT pre-therapy skills. Yet, there seems to be substantial variability of skill level, independent of mood. Therefore, mild dementia does not necessarily preclude CBT readiness.

Hindi Version of Addenbrooke's Cognitive Examination III: Distinguishing Cognitive Impairment Among Older Indians at the Lower Cut-Offs

Background

Screening and diagnostic tests provide an objective measure of cognitive performance and also aid in distinguishing mild cognitive impairment (MCI) from major neurocognitive disorder (MNCD). Further, when such tests are culturally and educationally unbiased, it strengthens their diagnostic utility. This study aimed to validate the Hindi version of Addenbrooke’s Cognitive Examination III (ACE-III) in Indian older adults and compare its validity with the Hindi Mini-Mental State Examination (HMSE).

Methods

A sample of 412 consenting older adults visiting a memory clinic was recruited into the study. They were categorized into three groups: healthy controls (n=222), MCI (n=70), and MNCD (n=120). The complete clinical protocol was followed. Hindi ACE-III and HMSE were administered and were statistically analyzed.

Results

The optimal cut-off values to detect MCI and MNCD with ACE-III were 71 and 62 (AUC: 0.849 and 0.884), respectively, which were slightly higher than with HMSE (AUC: 0.822, 0.861). Education- and age-stratified cut-offs were also computed.

Conclusion

Hindi ACE-III has good discriminating power at lower cut-offs than the standard scores in differentiating between MCI and MNCD.

Thought-feeling discrimination in people with dementia: adaptation and preliminary validation of the first dementia-specific measure

OBJECTIVE

There is emerging evidence that cognitive behavioral therapy (CBT) can be effective for treating anxiety and depression in people living with dementia (PLWD). Discriminating between thoughts and feelings is a critical element of CBT and also of relevance to emotional understanding more generally. The aim of the present study was the structured adaptation and preliminary validation of an existing measure of thought-feeling discrimination for use in PLWD.

METHODS/DESIGN

The Behavior Thought Feeling Questionnaire (BTFQ) was adapted via expert and service-user consultation for use in PLWD. One hundred two PLWD and 77 people aged over 65 years who did not have measurable cognitive impairments completed the adapted measure along with two measures of emotional recognition and reasoning. The factor structure of this measure was examined and the measure reduced.

RESULTS

Factor analysis suggested a two-factor solution with thought and feeling items loading on separate factors. The behavior items were not included in scoring due to high cross-loading and ceiling effects, leaving a 14-item measure with two subscales. Thus, an adapted measure was created (named the BTFQ-D), which showed moderate convergent validity in the PLWD but not the older adult sample. Both thought and feeling subscales showed good internal consistency.

CONCLUSIONS

The BTFQ-D showed preliminary validity as a measure of thought-feeling discrimination in PLWD. It may have utility in measuring readiness for CBT as part of clinical assessment. Further validation is required.

Cognitive mediation in people with dementia: Development, structural, and construct validity of the first dementia-specific measure

OBJECTIVES

Anxiety and depression are common and deleterious comorbidities in people living with dementia (PLWD). Cognitive behavioural therapy (CBT) is one of the few promising treatments; however, it is unclear whether PLWD have the necessary prerequisites to engage in this. Having an understanding of cognitive mediation, that a thought mediates the relationship between an antecedent event and its emotional consequence, is key for engaging with CBT and is also a critical component of emotion regulation. There are no measures of this construct validated for PLWD. This study aims to adapt and validate an existing measure for this population. A secondary aim is to assess its applicability in older adults (OA) without a recognised neurocognitive impairment.

METHODS

A measure of cognitive mediation was adapted via expert and service user consultation for use in PLWD. A total of 102 PLWD and 77 OA without neurocognitive impairments completed the adapted measure along with two measures of emotion recognition and reasoning. Factor structure was examined separately in both samples, and the measure reduced, with convergent validity assessed.

RESULTS

A final measure of 10 items (named the CM-Dem) was subject to factor analysis yielding a single factor solution. The measure showed good psychometric properties in PLWD, including good model fit, high internal consistency, inter-rater reliability, and moderate convergent validity with related constructs. In contrast, poor validity was found in OA, especially a lack of convergent validity.

CONCLUSIONS

The CM-Dem has clinical and research utility as a measure of cognitive mediation in PLWD, but less so in OA.

Addenbrooke's cognitive examination III in the diagnosis of dementia: a critical review

Addenbrooke's cognitive examination III is a screening test that is composed of tests of attention, orientation, memory, language, visual perceptual and visuospatial skills. It is useful in the detection of cognitive impairment, especially in the detection of Alzheimer's disease and fronto-temporal dementia. The aim of this study is to do a critical review of the Addenbrooke's cognitive examination III. The different language versions available and research about the different variables that have relationship with the performance of the subject in the ACE-III are listed. The ACE-III is a detection technique that can differentiate patients with and without cognitive impairment, is sensitive to the early stages of dementia, and is available in different languages. However, further research is needed to obtain optimal cutoffs for the different versions and to evaluate the impact of different age, gender, IQ, and education variables on the performance of the test.