The Montreal Cognitive Assessment (MoCA) with a double threshold: improving the MoCA for triaging patients in need of a neuropsychological assessment.

OBJECTIVES: Diagnosis of patients suspected of mild dementia (MD) is a challenge and patient numbers continue to rise. A short test triaging patients in need of a neuropsychological assessment (NPA) is welcome. The Montreal cognitive assessment (MoCA) has high sensitivity at the original cutoff <26 for MD, but results in too many false-positive (FP) referrals in clinical practice (low specificity). A cutoff that finds all patients at high risk of MD without referring to many patients not (yet) in need of an NPA is needed. A difficulty is who is to be considered at risk, as definitions for disease (e.g. MD) do not always define health at the same time and thereby create subthreshold disorders. DESIGN: In this study, we compared different selection strategies to efficiently identify patients in need of an NPA. Using the MoCA with a double threshold tackles the dilemma of increasing the specificity without decreasing the sensitivity and creates the opportunity to distinguish the clinical (MD) and subclinical (MCI) state and hence to get their appropriate policy. SETTING/PARTICIPANTS: Patients referred to old-age psychiatry suspected of cognitive impairment that could benefit from an NPA (n = 693). RESULTS: The optimal strategy was a two-stage selection process using the MoCA with a double threshold as an add-on after initial assessment. By selecting who is likely to have dementia and should be assessed further (MoCA<21), who should be discharged (≥26), and who's course should be monitored actively as they are at increased risk (21<26). CONCLUSION: By using two cutoffs, the clinical value of the MoCA improved for triaging. A double-threshold MoCA not only gave the best results; accuracy, PPV, NPV, and reducing FP referrals by 65%, still correctly triaging most MD patients. It also identified most MCIs whose intermediate state justifies active monitoring.

Clinical value of the Montreal Cognitive Assessment (MoCA) in patients suspected of cognitive impairment in old age psychiatry. Using the MoCA for triaging to a memory clinic.

Objectives: Diagnostic pathways are limited. A validated instrument that can triage patients when they are suspected of mild dementia (MD) is necessary to optimise referrals. Method: The MoCA is validated for identifying MD and mild cognitive impairment (MCI) in a cohort of patients suspected of cognitive impairment (CI) after initial assessment in old age psychiatry. The reference standard was the consensus-based diagnoses for MD and MCI, adhering to the international criteria and using suspected patients, but without CI as comparisons (NoCI). Results: The mean MoCA scores differ significantly between the groups: 24(SE: .59) in NoCI, 21(SE: .31) in MCI and 16,7(SE: .45) in MD (p < .05). The AUC of MD against non-demented (MCI + NoCI) was 0.83(95%CI: 0.78-0.88) resulting in 90% sensitivity, 65% specificity, 50%PPV and 94%NPV at a "best" cutoff of <21 according the Youden index and respectively 0.77(95%CI: 0.69-0.85), 56%, 73%, 90%, 28% for CI (MD + MCI) against NoCI at <21. Conclusion: 90% of individuals with a MoCA of <21 will have CI (MD + MCI), while 94% with a MoCA of ≥21 will not have dementia. The MoCA can reduce referrals substantially (50%) by selecting who don't need further work up in a memory clinic, even if they were suspected of CI after initial assessment.

Diagnostic accuracy of the Montreal Cognitive Assessment (MoCA) for cognitive screening in old age psychiatry: Determining cutoff scores in clinical practice. Avoiding spectrum bias caused by healthy controls.

OBJECTIVE/METHODS: The Montreal Cognitive Assessment (MoCA) is an increasingly used screening tool for cognitive impairment. While it has been validated in multiple settings and languages, most studies have used a biased case-control design including healthy controls as comparisons not representing a clinical setting. The purpose of the present cross-sectional study is to test the criterion validity of the MoCA for mild cognitive impairment (MCI) and mild dementia (MD) in an old age psychiatry cohort (n = 710). The reference standard consists of a multidisciplinary, consensus-based diagnosis in accordance with international criteria. As a secondary outcome, the use of healthy community older adults as additional comparisons allowed us to underscore the effects of case-control spectrum-bias. RESULTS: The criterion validity of the MoCA for cognitive impairment (MCI + MD) in a case-control design, using healthy controls, was satisfactory (area under the curve [AUC] 0.93; specificity of 73% less than 26), but declined in the cross-sectional design using referred but not cognitive impaired as comparisons (AUC 0.77; specificity of 37% less than 26). In an old age psychiatry setting, the MoCA is valuable for confirming normal cognition (greater than or equal to 26, 95% sensitivity), excluding MD (greater than or equal to 21; negative predictive value [NPV] 98%) and excluding MCI (greater than or equal to 26;NPV 94%); but not for diagnosing MD (less than 21; positive predictive value [PPV] 31%) or MCI (less than 26; PPV 33%). CONCLUSIONS: This study shows that validating the MoCA using healthy controls overestimates specificity. Taking clinical and demographic characteristics into account, the MoCA is a suitable screening tool-in an old age psychiatry setting-for distinguishing between those in need of further diagnostic investigations and those who are not but not for diagnosing cognitive impairment.

The care needs of older patients with bipolar disorder.

OBJECTIVES: With aging, bipolar disorder evolves into a more complex illness, with increasing cognitive impairment, somatic comorbidity, and polypharmacy. To tailor treatment of these patients, it is important to study their needs, as having more unmet needs is a strong predictor of a lower quality of life. METHOD: Seventy-eight Dutch patients with bipolar I or II disorder aged 60 years and older in contact with mental health services were interviewed using the Camberwell Assessment of Need in the Elderly (CANE) to assess met and unmet needs, both from a patient and a staff perspective. RESULTS: Patients (mean age 68 years, range 61-98) reported a mean of 4.3 needs compared to 4.4 reported by staff, of which 0.8 were unmet according to patients and 0.5 according to staff. Patients frequently rated company and daytime activities as unmet needs. More current mood symptoms were associated with a higher total number of needs. Less social participation was associated with a higher total number of needs and more unmet needs. CONCLUSION: Older bipolar patients report fewer needs and unmet needs compared to older patients with depression, schizophrenia, and dementia. A plausible explanation is that older bipolar patients had higher Global Assessment of Functioning scores, were better socially integrated, and had fewer actual mood symptoms, all of which correlated with the number of needs in this study. The results emphasize the necessity to assess the needs of bipolar patients with special attention to social functioning, as it is suggested that staff fail to recognize or anticipate these needs.