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 Table of Contents  
ORIGINAL ARTICLE
Year : 2016  |  Volume : 36  |  Issue : 1  |  Page : 14-21

Cognitive function, depressive symptoms, function level, and quality of life in mild dementia and amnestic-mild cognitive impairment


1 Department of Psychiatry, Zuoying Branch of Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan, Republic of China
2 Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China
3 Department of Psychiatry, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung, Taiwan, Republic of China

Date of Submission17-Aug-2015
Date of Decision06-Sep-2015
Date of Acceptance27-Oct-2015
Date of Web Publication23-Feb-2016

Correspondence Address:
Shu Ping Chuang
Department of Psychiatry, Zuoying Branch of Kaohsiung Armed Forces General Hospital, No. 553, Jiunshiau Road, Zuoying District, Kaohsiung 81342, Taiwan
Republic of China
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1011-4564.177171

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  Abstract 

Objective: The present study aimed to investigate the relationship among neurocognitive variables, depressive symptoms, functional activities, and the quality of life (QoL) in patients with mild dementia and single-domain amnestic mild cognitive impairment (a-MCI). Materials and Methods: Thirty-seven mild dementia patients and thirty a-MCI participants were recruited. All subjects participated in a series of neuropsychological measures (Cognitive Abilities Screening Instrument, family pictures, and digit span), geriatric depression scale-15 (GDS-15), activities of daily living (ADL), The Lawton instrumental ADL scale (IADL) and QoL-Alzheimer's disease. Results: Multiple regression analysis revealed that only depressive symptoms was a predictor for the QoL in mild dementia (β = −0.56, P < 0.001). In contrast, all variables were not associated with the QoL in a-MCI. Mildly demented people scored significantly lower on most aspects of cognitive functioning and reported poorer performances on IADL than a-MCI. There were no significant differences on GDS, ADL, and QoL between the two groups. Conclusion: Findings indicated that depressive symptoms contributed to the QoL in mild dementia. Interventions targeting depressive symptoms in mild dementia may improve their QoL during their early stages of dementia.

Keywords: Cognitive functioning, depressive symptoms, functional level, mild dementia, mild cognitive impairment, quality of life


How to cite this article:
Chuang SP, Wu JY, Wang CS, Pan LH. Cognitive function, depressive symptoms, function level, and quality of life in mild dementia and amnestic-mild cognitive impairment. J Med Sci 2016;36:14-21

How to cite this URL:
Chuang SP, Wu JY, Wang CS, Pan LH. Cognitive function, depressive symptoms, function level, and quality of life in mild dementia and amnestic-mild cognitive impairment. J Med Sci [serial online] 2016 [cited 2019 May 24];36:14-21. Available from: http://www.jmedscindmc.com/text.asp?2016/36/1/14/177171


  Introduction Top


Treatments in dementia have increasingly focused on aiming to maintain and/or improve their quality of life (QoL).[1],[2] Recent studies strove to investigate the linkage between QoL and cognitive functioning; however, the results are conflicting. Demented participants in long-term care institutions were reported to have lower levels of QoL than those with mild cognitive impairment (MCI) and controls, while both cognitive function and behavior symptoms in themselves were predictors of QoL.[3] Wlodarczyk et al.[4] showed that mini-mental state examination (MMSE) scores were correlated to patient-QoL in mild to moderate dementia. However, in care home settings, cognitive function was not the predictor of patient-QoL in patients with moderate dementia.[5] Higher QoL in mild to moderate dementia was not significantly correlated with cognitive function.[6] Converging evidence showed that the multinomial MCI group was significantly impaired on scores or total instrumental activities of daily living (IADL) compared to single-domain amnestic-MCI (a-MCI) or controls.[7],[8] Although, MMSE has been commonly used, [9] the Cognitive Abilities Screening Instrument (CASI) combines elements from the mostly used tests of global cognitive function [10],[11],[12],[13] and is a more detailed assessment of cognition than MMSE. In this study, CASI was used to assess for cognitive functioning and people with mild dementia were recruited and asked to self-report on their QoL. Different stages of dementia can comprise of various profiles in cognitive, functional, and behavioral symptoms. Particularly, cognitive decline is more impaired in the moderate stage of dementia compared to the mild dementia stage and affects language and abstract thought. IADLs are almost totally lost, and behavioral symptoms increase dramatically with severity.[14],[15] In the past, a number of researches have included study samples with a mixture of mildly, moderately or severely demented people, and included them all as the demented patient group. It should be noted, however, that individuals with moderate to severe dementia have more cognitive and functional impairment, causing their inability to express themselves properly, and thus, patients with moderate to severe dementia were not included in this study.

Several studies have found that depression was the most significant factor influencing the QoL of demented people.[5],[6],[16],[17] Other potential determinants such as impairment in the ADL and IADL were significantly associated with the QoL in dementia.[3],[4] Several longitudinal studies have reported that people with depression are more at risk to develop dementia and MCI compared to nondepressed participants.[18],[19],[20] Dementia often increases a high prevalence of neuropsychiatric symptoms, raises burden to caregivers, and lowers the QoL of the patients.[21] The presence of mobility-related impairment can have a strong impact on the IADL and ADL scores in older people.[22]

The results by Fuh and Wang [23] showed that caregiver distress is the most consistent predictor of informant-QoL rating and that patients' depressive severity is the most significant predictor of patient-QoL. Other researchers also found that reports by either the caregiver (or staff) or the patient regarding the patient-QoL could indicate the unique perspectives of the patient and caregiver.[5],[24] QoL as assessed by caregivers and patients could differ due to the use of different versions of patient-QoL assessment. In this study, patient-reported QOL was utilized to assess their QoL. Since medication cannot modify or reverse the whole course of this illness, [25] treatments in dementia have increasingly focused their attention on aiming to maintain or improve their QoL.[26],[27] People with MCI probably have a higher risk in developing dementia [28] and factors related to QoL in the two groups may have different profiles in early cognitive impairment. To date, relatively few studies of the predictors or correlates of QoL have included people with a single-domain MCI compared to mild dementia. Therefore, the aim of this study was to compare individuals with mild dementia and the a-MCI group based on their self-reported ratings of their QoL excluding confounding factors. We hypothesized that individuals with mild dementia would show a decrease in cognitive functioning, functional abilities, and more depressive symptoms than the a-MCI group; a comparison between these two groups are examined to determine which factors are significantly associated with QoL.


  Materials and Methods Top


Participants

The study protocol was reviewed and approved by Kaohsiung Armed Forces General Hospital Institutional Review Board. Dementia was diagnosed using the Structured Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders, 4 [th] Edition diagnoses [29] by a senior psychiatrist from the Department of Psychiatry at the Zuoying Branch of Kaohsiung Armed Forces General Hospital in Taiwan. All participants provided written informed consent before entering into this study. Based on diagnosis results, different dementia types were assessed including 28 Alzheimer's disease (AD), 4 vascular dementia, and 5 dementia due to brain damage. Exclusion criteria for dementia and MCI were: Having a current and a history of psychiatric disorder, such as schizophrenia, mood disorder, and substance abuse, other neurologic disorders besides cognitive impairment, severe physical disorder, and behavioral disturbances. All patients were not receiving medication for dementia (such as donepezil, galantamine, memantine, and rivastigmine) at the recruitment of this study. We also excluded people with moderate to severe dementia (due to their inability to correctly express their QoL because of profound cognitive impairment). Thirty participants were diagnosed with MCI according to Petersen, [30] which included specific recommendations for MCI criteria: Subjective memory complaint, normal ADL, normal general cognitive function, and abnormal memory for age and not dementia. In order to gain sample homogeneity, only patients with the same amnesic type of MCI (all amnesic single-domain) were recruited: Subjects should have normal scores of MMSE, maintained scores of ADL and not be diagnosed with dementia (see below).

Measures

Cognitive Abilities Screening Instrument


The CASI has a score range of 0-100 and provides quantitative domains of assessment on attention, concentration and judgment, orientation, short-term memory, long-term memory, language abilities, visual construction, list-generating fluency, and abstraction. The CASI demonstrates good reliability and cross-cultural applicability and is useful in screening dementia, monitoring the progression of disease, and providing profiles of cognitive deterioration.[31]

Quality of life-Alzheimer's disease

QOL-AD is a brief, 13-item instrument used separately to ask participants with dementia and informants to rate participants' QoL across a number of different domains. It has been shown to have very good internal consistency and validity. The items are each rated on a 4-point scale (1 = poor and 4 = excellent), adding up to a total score ranging from 13 to 52, with higher scores indicating higher QoL. Ratings from the patient-report were used in this study.[32]

Wechsler Memory Scale-III-Family Pictures I

The family pictures (FP) was used to evaluate the patient's processing of complex, meaningful, and visual presented information. Participants were introduced to a "family portrait" colored drawings of six members (mother, father, grandfather, grandmother, son, and daughter) and their dog for 10 s. The portrait contained four family members appearing in four different scenes. Participants were asked to remember who the character was, what their positions are, and what the characters were doing.[33]

Wechsler Memory Scale-III

Forward and reverse digit span was used to measure working memory. Participants are presented with a series of digits (e.g., digit span forward and backward) and asked to immediately reiterate the series of digit.[33]

Geriatric depression scale-15

The geriatric depression scale (GDS) is a self-reported questionnaire of depression in older adults. It consists of 15 questions about how participants have felt over the past week and is responded through a "Yes/No" format. Higher scores suggest that more depressive symptoms are present.[34]

Activities of daily living

The measurement assessed participant's mobility, self-care, and independence in 10 domains, including bowels, bladder, feeding, grooming, dressing, transferring from bed to chair and back, toilet use, mobility around house or ward, indoors, and stairs and bathing. Total scores ranged from 0 to 20, with higher scores indicating higher functioning.[35]

Lawton instrumental activities of daily living scale

This measurement assesses participants' independent living skills and is used to identify how a person is functioning at the present time and for recognizing the improvement or deterioration over time in 8 domains. Total scores range from 0 (low function, dependent) to 8 (high function, independent).[36] A clinical psychologist conducted the assessments of ADL and IADL to the participant and the informant. When the information provided by the participant was not consistent with the informant, the informant's version was applied.

Clinical Dementia Rating

The clinical dementia rating is a semi-structured interview of patients and informants. It assesses cognitive functioning rated on a 5-point scale from 6 domains, namely memory, orientation, judgment and problem solving, community affairs, home and hobbies, and personal care (0: No impairment; 0.5: Questionable impairment; 3: Severe impairment).[37]

Mini-mental state examination

The test is widely used for cognitive impairment. The normative cut-off values for the Chinese version adjusted to education were used. Subjects with a-MCI scored 15 on MMSE if they had ≤6 years of education, and 24 on MMSE if they had >7 years of education.[38]

Statistical analysis

Data analysis was carried out using  SPSS 16.0 (Statistical Package for the Social Sciences). Bivariate statistics using Pearson correlation were generated to understand the interrelationship among neuropsychological variables, functional abilities (ADL and IADL), depressive symptoms, and QoL. Comparisons of age, education, sex, religion, place of residence, and physical disorder between demented participants and MCI were performed using two sample t-tests or Chi-square statistics as appropriate and clinical measures were conducted using one-way analysis of covariance, controlling education and gender as covariates. Corrections for multiple testing were used according to the Bonferroni method to obtain results significant at a corrected alpha level of 0.05. Multiple regression analyses were used to explore significant predictors among neuropsychological variables, ADL, depressive symptoms, and QoL. The alpha level was set at 0.05 per comparison.


  Results Top


Descriptive statistics for participant's demographics are presented in [Table 1]. There were no significant differences in age, place of residence, physical disorder, and religion between demented patients and a-MCI participants. All participants were married, and none of them used alcohol or smoked. The demented group (mean = 5.9, standard deviation [SD] =4.4) had lower education years than the a-MCI group (mean = 8.8, SD = 4.0; P = 0.007) and the demented group consisted of more females (P = 0.04). Clinical characteristics of the demented patients and a-MCI participants are shown in [Table 2]; all clinical measures showed significant differences in mildly demented group and a-MCI group, except for attention (domain of CASI), digit span (forward), GDS, ADL, and QoL. Correlations among neuropsychological variables, depressive symptoms, IADL, ADL, and QoL in mild dementia and a-MCI are shown in [Table 3] and [Table 4] (Demographics that were not associated with the QoL in both groups were not shown in the Table). The domains of CASI, the FP, digit span forward and backward were not correlated with the QoL in mild dementia, whereas, in contrast, only language and domain of CASI was correlated with the QoL in a-MCI (r = 0.39, P < 0.05, are not shown in Table).
Table 1: Sociodemographic characteristics of mildly demented patients and a-MCI participants

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Table 2: Clinical characteristics of patient group and a-MCI group

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Table 3: Correlations among neuropsychological variables, depressive symptoms, IADL, ADL and quality of life of mild dementia (n=37)

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Table 4: Correlations among neuropsychological variables, depressive symptoms, IADL, ADL and quality of life of a-MCI (n=30)

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The present study aimed to understand the extent to which neuropsychological variables, depressive symptoms, ADL, and IADL were related to the patient's QoL. Four multiple regression analyses were performed, which are shown in [Table 5].
Table 5: Multiple regression predicting quality of life from demographic characteristics and clinical measures in mildly demented participants (n=37)

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As summarized in [Table 5], depressive symptoms emerged to contribute significantly as a predictor of mild demented participant's QoL (adjusted r 2 = 0.26, P < 0.05). Other variables were not significant predictors of QoL. [Table 5] presents the details of beta weights of contributing variables. All variables did not predict the QoL in the a-MCI group (data not shown).


  Discussion Top


The results of our study demonstrated that individuals with mild dementia displayed more impairment in almost all of the cognitive measures and in IADL compared to the a-MCI group. This study showed a significantly negative correlation between depressive symptoms and QoL in mildly demented patients. Our finding was similar to that of Bhattacharya et al.[39] who found that depression was inversely associated with patient-rated QoL in mild dementia. In this study, we used CASI (more quantitative domains of cognitive abilities), other than MMSE and functional abilities, all of which were expected to show an impact on QoL, but our results were unforeseen. Previous studies have also found inconsistent results. Wlodarczyk et al.[4] represented that MMSE scores were correlated to patient-QoL in mild to moderate dementia (the patients receive donepezil treatment). Missotten et al.[3] reported MMSE, ADL, IADL correlated significantly with informant-QoL of dementia (not classified subtypes) in long-term care institution. Findings by Ready et al.[40] indicated that QoL is moderately related with greater dementia severity. On the other hand, Hoe et al.[5] found no significant correlation between MMSE scores and patient-QoL in patients with moderate dementia in residential care homes. Higher QoL of moderate to severe dementia was not correlated with cognitive function at baseline, but improvement in QoL was associated with increased cognitive performances and reduced depression.[3] Thus, the discrepancy in the findings may be due to several factors, including the severity of dementia, receiving medical treatment, residence of place or not excluding confounding factors (such as psychiatric disorder, neurological disorder, severe physical disorder, and dementia-behavioral symptoms).

In contrast, we found that the QoL in a-MCI was not associated with depression, cognitive functioning, and functional activities. Inconsistently, Teng et al.[41] indicated that depression scores were negatively correlated with subject-QoL in MCI people (mix of amnestic and nonamnestic). A recent study found that QoL was negatively associated with depressive mood and memory complaints while it was positively correlated with the self-efficacy of MCI (not classified subtypes).[42] A potential explanation may be the method selection of the MCI group. Our study cases included single-domain a-MCI which may complicate results. The differences of cognitive functioning between mild dementia and a-MCI were significant, indicating that mild dementia have lower scores in most aspects of cognition than a-MCI, except for attention (domain of CASI) and digit span (forward). People of subjective memory complaint with impaired digit showed wider cognitive decline in verbal memory and fluency compared to the normal digit span group, impaired digit span scores indicate an earlier sign for conversion of subjective memory complaint to MCI.[43] In the present study, no significant difference was shown in the digit span (forward) scores between the a-MCI and mild dementia groups, indicating that mild dementia still possessed these abilities, but not in backward digit span. Forward digit span does not have such a working memory burden as backward digit span.[44] The backward digit span involved mental double tracking in that both the memorizing and the reversing must operate simultaneously, and in this study, it seems that mildly demented people failed to possess this ability. Thus, if people with a-MCI have poor performance on backward digit span, it is possible that these people may be considered to have a higher risk of developing dementia.

Compared to a-MCI, mildly demented people also showed poorer performances on IADL. People with single-domain a-MCI performed similarly to the normal controls on IADL.[45] According to the results by Luck et al., [46] MCI subtypes with IADL impairment increased the conversion rate to dementia, implying that IADL impairment is a risk factor for developing dementia. Gold [47] concluded that multiple-domain MCI was more impaired than single-domain MCI on IADL, and mild IADL changes in MCI may be a strong predictor for incident dementia. Although depressive symptoms were not associated with QoL in this study, Pearson's correlation showed that shopping, doing laundry, using the telephone, and handling finances (domains of IADL) were negatively associated with depressive symptoms (r = -0.36 ~ -0.73, P < 0.05), suggesting that when these independent skills weakened, people with a-MCI may feel distressed and consider it as a sign of deteriorating health status or reduced self-efficacy. The link between depressive symptoms and QoL was only found in patients with mild dementia, but not a-MCI. It is possible that people with a-MCI may perceive their cognitive decline as a normal decline and maintained a good health status (self-rated memory and perceived health status not measured in this study). Kosteniuk et al.[48] found that elevated depressive symptoms were negatively associated with self-rated memory and QoL for the patients with dementia, but not in the MCI group (the type of two groups were not classified).

In this study, we excluded confounding factors to investigate, which clinical measures impacted QoL in the two groups. A few limitations should be noted. The small sample size in the present study may have limited the strength of the primary findings, which require confirmation in a larger mild dementia and a-MCI sample. In this study, we used QOL-AD, which specifically examined the QoL in AD. Other measurements of QOL may be considered for future research. The cross-sectional nature of our study did not allow us to test the causal effect of clinical measures on QoL in this study. A longer follow-up is needed to test subsequent factors associated with the QoL. Another potential limiting factor was that the findings might not be referred to the different stages of dementia, subgroups of MCI and other cognitive impaired adults. Other factors, such as economic status, perceived stress level, self-efficacy, and health status, could be considered in investigating their relationship with the QoL in these two groups.


  Conclusion Top


In summary, our data suggested that more depressive symptoms were associated with a lower QoL in mild dementia patients, but not in a-MCI. Our results suggest that interventions targeting depressive symptoms in mild dementia may be the most effective in improving QoL for these individuals.[49],[50]

Acknowledgment

This study was supported by grant from Zuoying Branch of Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan (ZBH103-15).

Financial support and sponsorship

Zuoying Branch of Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan (ZBH103-15).

Conflicts of interest

There are no conflicts of interest.

 
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    Tables

  [Table 1], [Table 2], [Table 3], [Table 4], [Table 5]


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