Marie-Jeanne Kergoat

Benefits of Physical Exercise Training on Cognition and Quality of Life in Frail Older Adults

OBJECTIVES Frailty is a state of vulnerability associated with increased risks of fall, hospitalization, cognitive deficits, and psychological distress. Studies with healthy senior suggest that physical exercise can help improve cognition and quality of life. Whether frail older adults can show such benefits remains to be documented. METHOD A total of 83 participants aged 61-89 years were assigned to an exercise-training group (3 times a week for 12 weeks) or a control group (waiting list). Frailty was determined by a complete geriatric examination using specific criteria. Pre- and post-test measures assessed physical capacity, cognitive performance, and quality of life. RESULTS Compared with controls, the intervention group showed significant improvement in physical capacity (functional capacities and physical endurance), cognitive performance (executive functions, processing speed, and working memory), and quality of life (global quality of life, leisure activities, physical capacity, social/family relationships, and physical health). Benefits were overall equivalent between frail and nonfrail participants. DISCUSSION Physical exercise training leads to improved cognitive functioning and psychological well-being in frail older adults.

The cognitive and neural expression of semantic memory impairment in mild cognitive impairment and early Alzheimer's disease

Semantic deficits in Alzheimers disease have been widely documented, but little is known about the integrity of semantic memory in the prodromal stage of the illness. The aims of the present study were to: (i) investigate naming abilities and semantic memory in amnestic mild cognitive impairment (aMCI), early Alzheimers disease (AD) compared to healthy older subjects; (ii) investigate the association between naming and semantic knowledge in aMCI and AD; (iii) examine if the semantic impairment was present in different modalities; and (iv) study the relationship between semantic performance and grey matter volume using voxel-based morphometry. Results indicate that both naming and semantic knowledge of objects and famous people were impaired in aMCI and early AD groups, when compared to healthy age- and education-matched controls. Item-by-item analyses showed that anomia in aMCI and early AD was significantly associated with underlying semantic knowledge of famous people but not with semantic knowledge of objects. Moreover, semantic knowledge of the same concepts was impaired in both the visual and the verbal modalities. Finally, voxel-based morphometry analyses revealed that semantic impairment in aMCI and AD was associated with cortical atrophy in the anterior temporal lobe (ATL) region as well as in the inferior prefrontal cortex (IPC), some of the key regions of the semantic cognition network. These findings suggest that the semantic impairment in aMCI may result from a breakdown of semantic knowledge of famous people and objects, combined with difficulties in the selection, manipulation and retrieval of this knowledge.

“Learning to Become a Family Caregiver” Efficacy of an Intervention Program for Caregivers Following Diagnosis of Dementia in a Relative

PURPOSE The purpose of this experimental study was to test the efficacy of a psychoeducational individual program conceived to facilitate transition to the caregiver role following diagnosis of Alzheimer disease in a relative. DESIGN AND METHODS Caregivers were recruited in memory clinics and randomized to an experimental group (n = 62) or a control group (n = 49) receiving usual care. Eligible participants-primary caregivers of a relative diagnosed with Alzheimer in the past 9 months-were assessed blindly before randomization, at the end of the program (post-test), and 3 months later (follow-up) on different outcomes associated with healthy role transition. RESULTS The analyses indicated that at post-test and follow-up, caregivers in the experimental group were more confident in dealing with caregiving situations, perceived themselves to be better prepared to provide care and more efficacious in their caregiver role, were better able to plan for the future care needs of their relative, had better knowledge of available services, and made more frequent use of the coping strategies of problem solving and reframing. The program had no significant effect on use of stress-management strategies, perceived informal support and family conflicts. IMPLICATIONS This program underscores that a proactive intervention approach from the onset of the care trajectory is key to fostering caregiver adaptation to the new challenges they must meet.

The multiple dimensions of frailty: physical capacity, cognition, and quality of life.

BACKGROUND Frailty is a complex health state of increased vulnerability associated with adverse outcomes such as disability, falls, hospitalization, and death. Along with physical impairments, cognition and quality of life may be affected in frail older adults. Yet, evidence is still lacking. The aim of this study was to compare frail and non-frail older adults on physical, cognitive, and psychological dimensions. METHODS Thirty-nine frail and 44 non-frail elders were compared on several measures of physical capacity, cognition, and quality of life. Frailty status was based on a geriatric examination and scored using the Modified Physical Performance Test. RESULTS After controlling for demographic and medical characteristics, physical capacity measures (i.e. functional capacities, physical endurance, gait speed, and mobility) were significantly lower in frail participants. Frail participants showed reduced performances in specific cognitive measures of executive functions and processing speed. On the quality of life dimension, frail elders reported poor self-perceptions of physical capacity, cognition, affectivity, housekeeping efficacy, and physical health. CONCLUSION In addition to the reduced physical capacity, frailty might affect selective components of cognition and quality of life. These dimensions should be investigated in intervention programs designed for frail older adults.

Low Vitamin K Intakes in Community-Dwelling Elders at an Early Stage of Alzheimer's Disease

An increasing body of evidence points to a role for vitamin K in brain physiology through its participation in sphingolipid metabolism and biological activation of the vitamin K-dependent protein Gas6. One hypothesis is that vitamin K may also play a role in the pathogenesis of Alzheimers disease. A recent study found that patients with early-stage Alzheimers disease consumed less vitamin K than did cognitively intact control subjects. To learn more about the dietary intakes and food sources of vitamin K in these patients, a detailed analysis was conducted. Dietary vitamin K intakes were assessed from 5 nonconsecutive days of food records collected from 31 community-dwelling patients with early-stage Alzheimers disease and in 31 age- and sex-matched cognitively intact control subjects. Mean vitamin K intake on a person-day basis was 63+/-90 microg/day in patients and 139+/-233 microg/day in control subjects. Vitamin K intakes were significantly less in participants with Alzheimers disease (P<0.0001), even after adjusting for energy intakes (P=0.0003). Vegetables, fats, and fruits contributed more than 70% of total vitamin K intake in both groups. The main source of vitamin K was green vegetables, which contributed 33% and 49% to total intakes in patients and control subjects, respectively. This lower consumption of green vegetables in participants with Alzheimers disease explained their lower vitamin K intakes overall. Despite their limitations, results are in line with the most recent research in both vitamin K and Alzheimers disease and suggest a need to consider vitamin K in future investigations on the role of diet in Alzheimers disease.

Selecting process quality indicators for the integrated care of vulnerable older adults affected by cognitive impairment or dementia

BackgroundThis study aimed at evaluating face and content validity, feasibility and reliability of process quality indicators developed previously in the United States or other countries. The indicators can be used to evaluate care and services for vulnerable older adults affected by cognitive impairment or dementia within an integrated service system in Quebec, Canada.MethodsA total of 33 clinical experts from three major urban centres in Quebec formed a panel representing two medical specialties (family medicine, geriatrics) and seven health or social services specialties (nursing, occupational therapy, psychology, neuropsychology, pharmacy, nutrition, social work), from primary or secondary levels of care, including long-term care. A modified version of the RAND®/University of California at Los Angeles (UCLA) appropriateness method, a two-round Delphi panel, was used to assess face and content validity of process quality indicators. The appropriateness of indicators was evaluated according to a) agreement of the panel with three criteria, defined as a median rating of 7–9 on a nine-point rating scale, and b) agreement among panellists, judged by the statistical measure of the interpercentile range adjusted for symmetry. Feasibility of quality assessment and reliability of appropriate indicators were then evaluated within a pilot study on 29 patients affected by cognitive impairment or dementia. For measurable indicators the inter-observer reliability was calculated with the Kappa statistic.ResultsInitially, 82 indicators for care of vulnerable older adults with cognitive impairment or dementia were submitted to the panellists. Of those, 72 (88%) were accepted after two rounds. Among 29 patients for whom medical files of the preceding two years were evaluated, 63 (88%) of these indicators were considered applicable at least once, for at least one patient. Only 22 indicators were considered applicable at least once for ten or more out of 29 patients. Four indicators could be measured with the help of a validated questionnaire on patient satisfaction. Inter-observer reliability was moderate (Kappa = 0.57).ConclusionA multidisciplinary panel of experts judged a large majority of the initial indicators valid for use in integrated care systems for vulnerable older adults in Quebec, Canada. Most of these indicators can be measured using patient files or patient or caregiver interviews and reliability of assessment from patient-files is moderate.

The unique experience of spouses in early-onset dementia.

To date, few studies have examined the experience of spouse caregivers living with a person with early-onset dementia. Moreover, few support resources are offered to these family caregivers and fewer are still tailored to their unique trajectory. The aim of this qualitative study was to document the lived experience of spouse caregivers of young patients in order to inform the development of professional support tailored to their reality. A sample of 12 spouses of persons diagnosed with dementia before the age of 65 participated in semistructured interviews. Six themes emerged from their caregiver trajectories, namely, difficulty managing behavioral and psychological symptoms, long quest for diagnosis, nondisclosure to others and denial of diagnosis, grief for loss of spouse and midlife projects, difficulty juggling unexpected role and daily life responsibilities, and difficulty planning for future. Results open up innovative avenues for the development of interventions geared to facilitating role transition for these spouse caregivers.

Visual retinocortical function in dementia of the Alzheimer type

Background: Some histological investigations have reported anomalies in the primary visual pathways of individuals with dementia of the Alzheimer type (DAT), while others have suggested that these visual structures are spared by the disease process. Objectives: This study was conducted to address this issue of substantial controversy. We determined in vivo whether DAT alters the functioning of the primary visual pathways by evaluating pattern-reversal electroretinograms (ERGs) and cortical visual evoked potentials (VEPs). Methods: Twenty-seven individuals with mild to moderate DAT and 27 age- and sex-matched control subjects were included in the investigation. ERG and VEP recordings were obtained from all participants with the use of a clinical electrodiagnostic system. Stimulus conditions were biased towards a preferential response from the magnocellular and parvocellular subdivisions of the visual system. Results: Amplitude and latency of the ERG were not affected by DAT. The VEP amplitude was not attenuated in DAT individuals, but there was a delay in the latency of the VEPs arising from both magnocellular and parvocellular streams of visual processing. Conclusion: Our results indicate that while the inner retina appears to be spared by the disease process, the visual function is altered upstream in the retinocortical visual pathways of individuals with DAT.

Challenges associated with transition to caregiver role following diagnostic disclosure of Alzheimer disease: A descriptive study

BACKGROUND The prevalence of Alzheimers disease is rising. The large number of new cases identified each year means that many new families will set upon a long trajectory of caring for a relative with dementia. Diagnostic disclosure of Alzheimers disease marks the official transition to the caregiver role, yet this early period of the caregiver career have rarely been studied. OBJECTIVES Based on Meleiss theoretical framework for role transition, the objectives of this study were to document the characteristics of the caregiving context during the transition to the caregiver role following diagnostic disclosure of Alzheimers disease and to compare these characteristics by caregiver gender and kinship tie to the relative. DESIGN SETTINGS AND PARTICIPANTS A descriptive design was used. Data were collected using standardized measures selected in accordance with the role transition theoretical framework. The sample recruited in Quebec (Canada) cognition clinics comprised 122 caregivers of an elderly relative diagnosed with Alzheimers disease in the past nine months. RESULTS Findings reveal the context of care to be marked by several challenges for caregivers. The majority of caregivers receives little informal support, has poor knowledge of available formal services, and has difficulty planning ahead for the relatives future care needs. Caregivers themselves report a lack of preparedness to provide care. Compared with men caregivers, women seem to have more problems controlling disturbing thoughts about their new caregiver role and to experience more family conflicts and psychological distress. Compared with offspring caregivers, spouse caregivers are less able to respond to the relatives disruptive behaviors, make less use of problem-solving strategies, and report fewer family conflicts. CONCLUSIONS The challenges faced by caregivers during the transition to the caregiver role are sensitive to nursing interventions. Pro-active interventions from the outset of the caregiving career, such as early assessment of caregiver needs for support and of caregiver preparedness to provide care as well as early psycho-educational interventions, are essential to foster positive caregiver responses to the challenges of their new role.

Explaining the Relationship between Three Eye Diseases and Depressive Symptoms in Older Adults

PURPOSE The purpose of this study is to examine whether patients with age-related eye diseases, like age-related macular degeneration (AMD), glaucoma, or Fuchs corneal dystrophy, are more likely to show signs of depression compared to a control group of older adults with good vision, and to determine whether reduced mobility mediates these relationships. METHODS We recruited 315 eligible patients (81 with AMD, 55 with Fuchs, 91 with glaucoma, and 88 controls) from the ophthalmology clinics of a Montreal hospital from September 2009 until December 2011. Depressive symptoms were assessed using the Geriatric Depression Scale Short Form (GDS-15). Life space was measured using the Life Space Assessment. Logistic regression was used to adjust for demographic, health, and social factors, and mediation was assessed using the methods of Baron and Kenny. RESULTS There were 78 people (25%) meeting the criteria for depression in the cohort. All three groups with eye disease were more likely to be depressed than the control group after adjusting for age, sex, ethnicity, education, cognitive score, limitations in activities of daily living, social support, and lens opacity (P < 0.05). Life space and limited activities due to a fear of falling appeared to mediate the relationship between eye disease and depression. CONCLUSIONS Visually limiting eye disease is associated with depression in older adults. Further research on interventions to prevent depression in patients with eye disease is warranted and should consider strategies to alleviate mobility limitation. Greater attention from families, physicians, and society to the mental health needs and mobility challenges of patients with eye disease is needed.