Getting lost in the community: a phone survey on the community-dwelling demented people in Hong Kong

Risk Factors Associated with Missing Incidents among Persons Living with Dementia: A Scoping Review

Worldwide, over 55-million people have dementia, and the number will triple by 2050. Persons living with dementia are exposed to risks secondary to cognitive challenges including getting lost. The adverse outcomes of going missing include injuries, death, and premature institutionalization. In this scoping review, we investigate risk factors associated with going missing among persons living with dementia. We searched and screened studies from four electronic databases (Medline, CINAHL, Embase, and Scopus), and extracted relevant data. We identified 3,376 articles, of which 73 met the inclusion criteria. Most studies used quantitative research methods. We identified 27 variables grouped into three risk factor domains: (a) demographics and personal characteristics, (b) health conditions and symptoms, and (c) environmental and contextual antecedents. Identification of risk factors associated with getting lost helps to anticipate missing incidents. Risk factors can be paired with proactive strategies to prevent incidents and inform policies to create safer communities.

Search and rescue incidents among persons 65 years and older in the USA: Examination of factors associated with death

OBJECTIVES

Older people are vulnerable to becoming lost from home, especially if alone and in unfamiliar environments. Incidents of older persons becoming lost are frequently reported and often requiring a search and rescue (SAR) response. Becoming lost is distressing to the person concerned, their carer, and family and may result in physical injury and/or death. This study examined what factors are associated with death among older persons reported lost from home.

METHODS/DESIGN

A retrospective cross-sectional study. Data were obtained from the International Search and Rescue Incident Database from 1985 to 2013. Participants comprised persons aged 65 years and older living in the United States. Individual, SAR incident, and environmental factors were analysed. The primary outcome of this study was lost person found alive or found dead on arrival. Relationships between categorical variables and outcome were summarised with contingency tables, chi-squared test p-values (or Fisher's-exact-test), and odds ratios (OR) with 95% confidence intervals (CI). Association between continuous variables and outcome were examined using multiple logistic regression. p-value of <0.05 was considered significant.

RESULTS

Among the 5242 SAR incidents, 1703 met the inclusion criteria, of which 87.8% (n = 1495) were found alive and 12.2% (n = 208) were found dead. Factors associated with death included: male gender (OR 1.46; CI 1.01-2.13; p = 0.048), cognitively intact (OR 0.32; CI 0.22-0.47; p < 0.001), prolonged SAR duration (OR: 1.028; CI: 1.021-1.035; p < 0.001), found in water/wetlands (OR 7.40; CI 3.37-16.24; p < 0.001), and extreme weather (OR: 2.06; 95% CI: 1.10-3.86; p = 0.024).

CONCLUSIONS

Older people have a fundamental human right to protection from preventable deaths. Findings indicate these rights are not being protected with deaths occurring frequently among older people who have become lost from home. To minimise fatalities, knowledge of factors associated with death could inform the development suitable assessment and intervention strategies for SAR teams and caregivers.

Predicting real world spatial disorientation in Alzheimer's disease patients using virtual reality navigation tests

Spatial navigation impairments in Alzheimer's disease (AD) have been suggested to underlie patients experiencing spatial disorientation. Though many studies have highlighted navigation impairments for AD patients in virtual reality (VR) environments, the extent to which these impairments predict a patient's risk for spatial disorientation in the real world is still poorly understood. The aims of this study were to (a) investigate the spatial navigation abilities of AD patients in VR environments as well as in a real world community setting and (b) explore whether we could predict patients at a high risk for spatial disorientation in the community based on their VR navigation. Sixteen community-dwelling AD patients and 21 age/gender matched controls were assessed on their egocentric and allocentric navigation abilities in VR environments using the Virtual Supermarket Test (VST) and Sea Hero Quest (SHQ) as well as in the community using the Detour Navigation Test (DNT). When compared to controls, AD patients exhibited impairments on the VST, SHQ, and DNT. For patients, only SHQ wayfinding distance and wayfinding duration significantly predicted composite disorientation score on the DNT (β = 0.422, p = 0.034, R² = 0.299 and β = 0.357, p = 0.046, R² = 0.27 respectively). However, these same VR measures could not reliably predict which patients were at highest risk of spatial disorientation in the community (p > 0.1). Future studies should focus on developing VR-based tests which can predict AD patients at high risk of getting spatially disorientated in the real world.

Using GPS Tracking to Investigate Outdoor Navigation Patterns in Patients With Alzheimer Disease: Cross-sectional Study

Background

Spatial disorientation is one of the earliest and most distressing symptoms seen in patients with Alzheimer disease (AD) and can lead to them getting lost in the community. Although it is a prevalent problem worldwide and is associated with various negative consequences, very little is known about the extent to which outdoor navigation patterns of patients with AD explain why spatial disorientation occurs for them even in familiar surroundings.

Objective

This study aims to understand the outdoor navigation patterns of patients with AD in different conditions (alone vs accompanied; disoriented vs not disoriented during the study) and investigate whether patients with AD experienced spatial disorientation when navigating through environments with a high outdoor landmark density and complex road network structure (road intersection density, intersection complexity, and orientation entropy).

Methods

We investigated the outdoor navigation patterns of community-dwelling patients with AD (n=15) and age-matched healthy controls (n=18) over a 2-week period using GPS tracking and trajectory mining analytical techniques. Here, for the patients, the occurrence of any spatial disorientation behavior during this tracking period was recorded. We also used a spatial buffer methodology to capture the outdoor landmark density and features of the road network in the environments that the participants visited during the tracking period.

Results

The patients with AD had outdoor navigation patterns similar to those of the controls when they were accompanied; however, when they were alone, they had significantly fewer outings per day (total outings: P<.001; day outings: P=.003; night outings: P<.001), lower time spent moving per outing (P=.001), lower total distance covered per outing (P=.009), lower walking distance per outing (P=.02), and lower mean distance from home per outing (P=.004). Our results did not identify any mobility risk factors for spatial disorientation. We also found that the environments visited by patients who experienced disorientation versus those who maintained their orientation during the tracking period did not significantly differ in outdoor landmark density (P=.60) or road network structure (road intersection density: P=.43; intersection complexity: P=.45; orientation entropy: P=.89).

Conclusions

Our findings suggest that when alone, patients with AD restrict the spatial and temporal extent of their outdoor navigation in the community to successfully reduce their perceived risk of spatial disorientation. Implications of this work highlight the importance for future research to identify which of these individuals may be at an actual high risk for spatial disorientation as well as to explore the implementation of health care measures to help maintain a balance between patients’ right to safety and autonomy when making outings alone in the community.

Effectiveness of Interventions for Preventing People With Dementia Exiting or Getting Lost

BACKGROUND AND OBJECTIVES

People with dementia are at risk of exiting premises unsupervised, eloping, or getting lost, potentially leading to harmful or distressing consequences. This review aimed to estimate the effectiveness of interventions for preventing people with dementia from exiting or getting lost.

RESEARCH DESIGN AND METHODS

A systematic review of English sources was undertaken. Health care (EMBASE, BNI, Medline, PubMed, CINAHL, PsycINFO, AMED, HTA, CENTRAL) and gray literature (OpenGrey) databases were searched using prespecified search terms. Additional studies were identified by hand-searching bibliographies of relevant reviews and included studies. Wide inclusion criteria were set to capture a range of intervention types. Data extraction and risk of bias assessment were completed independently by two reviewers. Methods were preregistered on PROSPERO.

RESULTS

Individual and overall risk of bias was too high for statistical meta-analyses. A narrative synthesis was therefore performed. Twenty-five studies with 814 participants were included, investigating a range of nonpharmacological interventions aiming to prevent exiting, facilitate retrieval, educate participants, or a combination of these. Seventeen (68%) of the included studies had critical risks of internal bias to outcomes, providing no useful evidence for the effectiveness of their respective interventions. The remaining 8 (32%) studies had serious risks of bias. Narrative synthesis of results yielded no overall robust evidence for the effectiveness of any interventions.

DISCUSSION AND IMPLICATIONS

No evidence was found to justify the recommendation of any interventions included in this review. Future studies should focus on high-quality, controlled study designs.

Geospatial Analysis of Environmental Risk Factors for Missing Dementia Patients

BACKGROUND

Dementia-related missing incidents are highly prevalent but still poorly understood. This is particularly true for environmental/geospatial risk factors, which might contribute to these missing incidents.

OBJECTIVE

The study aimed to conduct a retrospective, observational analysis on a large sample of missing dementia patient case records provided by the police (n = 210), covering dates from January 2014 to December 2017. In particular, we wanted to explore 1) whether there were any hotspot regions of missing incidents and 2) the relationship between outdoor landmark density and missing incidents.

METHODS

Global spatial autocorrelation (Moran's I) was used to identify the potential hotspot regions for missing incidents. Meanwhile, spatial buffer and regression modelling were used to determine the relationship between outdoor landmark density and missing incidents.

RESULTS

Our demographics measures replicated and extended previous studies of dementia-related missing incidents. Meanwhile, no hotspot regions for missing incidents were identified, while higher outdoor landmark density led to increased missing incidents.

CONCLUSION

Our results highlight that missing incidents do not occur in isolated hotspots of regions but instead are endemic in patients regardless of location. Higher outdoor landmark density emerges as a significant geospatial factor for missing incidents in dementia, which crucially informs future safeguarding/intervention studies.

Impact of road network structure on dementia-related missing incidents: a spatial buffer approach

Dementia-related missing incidents are a highly prevalent issue worldwide. Despite being associated with potentially life-threatening consequences, very little is still known about what environmental risk factors may potentially contribute to these missing incidents. The aim of this study was to conduct a retrospective, observational analysis using a large sample of police case records of missing individuals with dementia (n = 210). Due to the influence that road network structure has on our real world navigation, we aimed to explore the relationship between road intersection density, intersection complexity, and orientation entropy to the dementia-related missing incidents. For each missing incident location, the above three variables were computed at a 1 km radius buffer zone around these locations; these values were then compared to that of a set of random locations. The results showed that higher road intersection density, intersection complexity, and orientation entropy were all significantly associated with dementia-related missing incidents. Our results suggest that these properties of road network structure emerge as significant environmental risk factors for dementia-related missing incidents, informing future prospective studies as well as safeguarding guidelines.

Effectiveness of a home-based missing incident prevention program for community-dwelling elderly patients with dementia

ABSTRACTBackground:Getting lost is a recognized complication in patients with dementia. Preventive measures are lacking. This study aims to investigate the effectiveness of a home-based missing incident prevention program (HMIPP) in reducing missing incidents, time of searching, and caregivers' stress.

METHODS

The design was a pre- and post-intervention study. Patients were recruited from a hospital-based Geriatric Memory Clinic. Inclusion criteria were as follows: aged 60 years or above, established dementia, and Modified Functional Ambulation Categories score VI or VII. An occupational therapist performed the interventions at the patients's home. These included dementia education, prescription of assistive devices, on-site skills training, environmental modifications, community service referrals, and redesigning of daily life routine tasks. The number of missing incidents and caregivers' stress at three months and one year were compared with baseline data from one year before and the secondary outcome was time for searching of the last incident.

RESULTS

A total of 54 patients were recruited. The mean age was 78.8 years and 54% were females. Majority of patients had moderate dementia. The mean number of missing incidents per year was significantly reduced at three months and one year (0.70, 0.22, and 0.14 at 0, 3, and 12 months, respectively; p &lt; 0.001). The time for searching of last missing episode was reduced significantly (6.25, 0.13, and 0.35 hours, respectively; p &lt; 0.001). The caregivers' stress also decreased significantly at three months and one year.

CONCLUSION

The HMIPP was effective in reducing the number of missing incidents, searching time, and caregivers' stress at three months and one year.

How can we better use Twitter to find a person who got lost due to dementia?

Twitter is a social media platform for online message sharing. The aim of this study is to evaluate the effectiveness of using Twitter to search for people who got lost due to dementia. The online messages on Twitter, i.e., tweets, were collected through an Application Programming Interface. Contents of the tweets were analysed. The personal characteristics, features of tweets and types of Twitter users were collected to investigate their associations with whether a person can be found within a month. Logistic regression was used to identify the features that were useful in finding the missing people. Results showed that the young age of the persons with dementia who got lost, having tweets posted by police departments, and having tweets with photos can increase the chance of being found. Social media is reshaping the human communication pathway, which may lead to future needs on a new patient-care model.

Twitter can help find people who get lost due to dementia—if the social media tool is used optimally. Kelvin Tsoi and colleagues from the Chinese University of Hong Kong analysed over 45,000 tweets about people with dementia or Alzheimer’s disease who went missing. The researchers identified 40 individuals who were found within a month of the first tweet, and 14 others who were not. Comparing the two groups, they found that people were more likely to be located if they were younger, if police departments were tweeting about the missing person, and if tweets contained photos of the lost individuals. The findings point toward better ways of using Twitter to track down those who get lost, a common and unpredictable phenomenon that occurs for at least half of all people living with dementia.

Supporting ethical use of electronic monitoring for people living with dementia: Social work's role in assessment, decision-making, and review

Walking outdoors supports health and well-being, but some people living with dementia are at increased risk of getting lost and of harm while missing. Electronic monitoring can potentially play an important preventative role by enabling the person's location to be continuously monitored by caregivers. However, there are considerable ethical concerns arising from electronic monitoring. This paper explores these thematically, drawing attention to its implications for autonomy and liberty; privacy; dignity; the rights and needs of caregivers and families; beneficence and nonmaleficence. Following from this, key questions for consideration in social work assessment are identified. The ethical issues necessitate assessment of the person's unique circumstances and preferences and that of their caregivers, and careful ethical deliberation in decision-making. Social work can play an important role in facilitating inclusive assessment and decision-making, leading to consensus on intervening with electronic monitoring. The need for the ongoing review following implementation is discussed to track whether decisions need modification in light of the experience of usage. In conclusion, while legislative instruments and professional codes of ethics frame social work practice responses, there is need for a nuanced debate about ethical use of electronic monitoring and specific guidance to inform assessment, decision-making, and review.

Field Evaluations of Tracking/Locating Technologies for Prevention of Missing Incidents

BACKGROUND

Persons with dementia are at risk of a missing incident, which is defined as an instance in which a demented person's whereabouts are unknown to the caregiver and the individual is not in an expected location. Since it is critical to determine the missing person's location as quickly as possible, we evaluated whether commercially available tracking technologies can assist in a rapid recovery.

METHODS

This study examined 7 commercially available tracking devices: 3 radio frequency (RF) based and 4 global positioning system (GPS) based, employing realistic tracking scenarios. Outcome measures were time to discovery and degree of deviation from a straight intercept course.

RESULTS/CONCLUSION

Across all scenarios tested, GPS devices were found to be approximately twice as efficient as the RF devices in locating a "missing person." While the RF devices showed reasonable performance at close proximity, the GPS devices were found to be more appropriate overall for tracking/locating missing persons over unknown and larger distances.

The Incidence and Recurrence of Getting Lost in Community-Dwelling People with Alzheimer's Disease: A Two and a Half-Year Follow-Up

Getting lost (GL) is a serious problem for people living with Alzheimer's disease (PwAD), causing psychological distress in both PwAD and caregivers, and increasing the odds of being institutionalized. It is thus important to identify risk factors for the GL events in PwAD. Between April 2009 and March 2012, we invited 185 community-dwelling PwAD and their caregivers to participate in this study. At the baseline, 95 had experienced GL (Group B); the remaining 90 (Group A) had not. We focused on the incidence of GL events and the associated factors by way of demographic data, cognitive function assessed by the Cognitive Ability Screening Instrument (CASI), and spatial navigation abilities as assessed by the Questionnaire of Everyday Navigational Ability (QuENA). After a 2.5-year period, the incidence of GL in Group A was 33.3% and the recurrence of GL in Group B was 40%. Multiple logistic regression analysis revealed that the inattention item on the QuENA and orientation item on the CASI had independent effects on the GL incidence, while the absence of a safety range was associated with the risk of GL recurrence. During the 2.5 years, the PwAD with GL incidence deteriorated more in the mental manipulation item on the CASI than those without. We suggest that before the occurrence of GL, the caregivers of PwAD should refer to the results of cognitive assessment and navigation ability evaluation to enhance the orientation and attention of the PwAD. Once GL occurs, the caregivers must set a safety range to prevent GL recurrence, especially for younger people.

The Concept of Missing Incidents in Persons with Dementia

Behavioral symptoms of dementia often present the greatest challenge for informal caregivers. One behavior, that is a constant concern for caregivers, is the person with dementia leaving a designated area such that their whereabouts become unknown to the caregiver or a missing incident. Based on an extensive literature review and published findings of their own research, members of the International Consortium on Wandering and Missing Incidents constructed a preliminary missing incidents model. Examining the evidence base, specific factors within each category of the model were further described, reviewed and modified until consensus was reached regarding the final model. The model begins to explain in particular the variety of antecedents that are related to missing incidents. The model presented in this paper is designed to be heuristic and may be used to stimulate discussion and the development of effective preventative and response strategies for missing incidents among persons with dementia.

Trends in prevalence and mortality of dementia in elderly Hong Kong population: projections, disease burden, and implications for long-term care

Background. We describe the trends in prevalence and mortality of dementia among older people in Hong Kong over time. Projections of the number of older people with dementia through 2039 and estimation of the disease burden are also included. Methods. Prevalence data were extracted from previous studies in Hong Kong. Mortality data were obtained from the Department of Health of Hong Kong. Projections of the number of people with dementia were calculated by applying the prevalence rates of dementia obtained from previous studies to Hong Kong population projections. The burden of dementia was measured by Disability-Adjusted Life Years (DALYs). Results. The number of people aged 60 and above with dementia is projected to increase by 222%, from 103,433 in 2009 to 332,688 in 2039, with a large proportion of those living in institutions. The number of deaths due to dementia among people aged 60 and above has more than doubled between 2001 and 2009. Mortality rates for dementia have also risen. In 2006, about 286,313 DALYS were lost due to dementia. Conclusions. The information presented may be used to formulate a long-term care strategy for dementia of the ageing population in Hong Kong.

Validation of the route map recall test for getting lost behavior in Alzheimer's disease patients

Getting lost (GL) behavior is among the early symptoms in Alzheimer's disease (AD). Only a few tests, however, have been developed to screen for this symptom. The aim of this study was to develop an instrument, the Route Map Recall Test (RMRT), for the screening of the GL problem in AD patients. We examined the psychometric properties of the RMRT and its clinical utility to predict the GL risk in 23 AD patients and 43 cognitively healthy older adults. The results showed that the RMRT has a sound reliability (test-retest, r = .752, p < .001; Cronbach's α = 0.887, p < .001). The convergent validity was supported by the high correlations with Trail Making Test A and B. With the optimal criteria (93.5/104), the discriminative validity for the diagnosis of AD showed good sensitivity (86%) and specificity (70%), and sensitivity (100%) and specificity (67%) for GL in AD patients. The findings support the RMRT to be a useful tool for clinical screening of AD patients and their GL risk.

Prevalence of and antecedents to dementia-related missing incidents in the community

OBJECTIVE

The primary aim of this study is to examine the prevalence of and antecedents to missing incidents among community-dwelling persons with dementia.

METHODS

This prospective study used mailed surveys and telephone interviews.

RESULTS

The prevalence of having any incident was 0.46/year; the overall prevalence for missing incidents in this study was 0.65/year. Missing incidents had few antecedents and occurred largely when persons with dementia were performing everyday activities that they normally completed without incident.

CONCLUSION

Given that a missing incident is relatively common among persons with dementia, health care professionals should assist caregivers with a missing incident plan early in the disease process. Also, as missing persons are found by persons other than the caregiver and caregivers underutilize identification devices, health care professionals may recommend the use of identification devices to facilitate a safe return.