Cognitive and functional dementia assessment tools: review of Brazilian literature
Instrumentos de avaliação cognitiva e funcional em demência
Global aging trends
The aging of the world's population is the result of two factors: declines in fertility and increases in life expectancy. Fertility rates have declined in developing countries over the past 30 years. In addition, in developed countries, the largest gain ever in life expectancy at birth occurred during the 20th century, averaging 71% for females and 66% for males. Life expectancy at birth in developed countries now ranges from 76 to 80 years.
In 2000, the worldwide population of persons aged >
65 years was an estimated 420 million. During 2000-2030, the worldwide population aged =65 years is projected to increase by approximately 550 million to 973 million, increasing from 6.9% to 12.0% worldwide, from 15.5% to 24.3% in Europe, from 12.6% to 20.3% in North America, from 6.0% to 12.0% in Asia, and from 5.5% to 11.6% in Latin America and the Caribbean. Between 2000-2030, the number of persons in developing countries aged >
65 years is projected to almost triple, from approximately 249 million in 2000 to an estimated 690 million in 2030, and the developing countries' share of the world's population aged =65 years is projected to increase from 59% to 71%1.
Brazilian aging trends
The Brazilian elderly population (>
60 years) increased from 3 million in 1960 to 14 million by 2002. It is projected to reach 32 million by 20202.
Compared with developed countries, the Brazilian aging process has been faster, had deeper structural changes and has also taken place in a younger population3.
Dementia and aging
Several authors have highlighted that dementia is one of the chronic conditions that will affect a considerably increased number of elderly both in developed and developing countries.
A large number of epidemiological surveys show very similar results such as increasing rates with rising age4.
As adults live longer, the prevalence of Alzheimer's disease, which doubles every 5 years after age 65, is also expected to increase. Approximately 10% of adults aged >
65 years and 47% of adults aged >
85 years suffer from this degenerative and debilitating disease5.
Dementia around the world
The worldwide number of persons with dementia in 2000 was estimated at about 25 million persons. Almost half of the demented persons (46%) lived in Asia, 30% in Europe, and 12% in North America. Fifty-two percent lived in less developed regions. About 6.1% of the population 65 years of age and older suffered from dementia (about 0.5% of the worldwide population) and 59% were female. The number of new cases of dementia in 2000 was estimated to be 4.6 million (one new case every 7 seconds). The forecast indicated a considerable increase in the number of demented elderly from 25 million in the year 2000 to 63 million in 2030 (41 million in less developed regions) and to 114 million in 2050 (84 million in less developed regions)6,7.
Dementia has already been established as one of the major health challenges of this century due to the enormous burden these pathologies impose on health care systems. Dementia is a significant public health problem as it is one of the most common diseases in the elderly and a major cause of disability and mortality (Ritchie and Lovestone, 2002)8. Brazilian dementia prevalence has been estimated at 7.1% (54.1% Alzheimer Disease)9.
Dementia assessment tools
The dementia diagnosis is based on cognitive and functional evaluation. Some diagnostics criteria (DSMIII, DSM-IV) highlight instrumental cognitive domain evaluations.
Use of validated assessment tools provides structure for the assessment process, helps assure consistency, and provides a mechanism for periodic re-evaluation. The assessment approaches also foster a common language for the health care team and consist of measurable parameters that can be used to monitor outcomes10.
Physicians often underestimate the extent of disability that a patient has in basic ADLs. Further, physicians' recording of the level of function in medical notes is poor. By using standardized assessment tools, the evaluation can objectively document physical, cognitive, emotional, and functional conditions. Based on the evidence, assessment tools should be chosen to aid in diagnosis and to measure outcome treatment of dementia. Older patients should be screened by standardized assessment tools in order to improve diagnosis, assessment, and outcome measurement. There are many commonly used tools in dementia assessment11.
Cross-cultural adaptation, validation and reliability
One of the difficulties in ascertaining the number of people with dementia in developing countries is that many older people in these regions have little if any formal education, and often cannot read or write12.
Independent effects of age, sex, education and occupation were identified on scores for most but not all cognitive tests13. Considering that Brazil has a high number of illiterates and low educational subjects, such instruments should be adapted14.
a. To identify the most-used cognitive and functional assessment tools in Brazil, related to dementia diagnosis and treatment outcome;
b. To identify adaptations or normative data, when available.
The literature search was performed up until September 2006. Data were generated from PubMed, LILACS and Portal Periodicos CAPES / Brazilian thesis and dissertations database (PPC) databases using the search terms 'dementia' and 'alzheimer'. For the PubMed search the term "brazil" was also included. The LILACS search only considered abstracts in English or Portuguese.
Data collection criteria: a. Articles with abstract; b. Brazilian abstracts, related to adult Brazilian population; c. Clear mention of assessment tool in the abstract text.
The search result of three databases (Table 1) was submitted to criteria above and the repeated abstracts were excluded. 108 abstracts were selected for the following analysis: a. to identify the instruments used; b. to determine how many of the selected abstracts cited each tool; and c. to search in the mentioned databases for respective test adaptations or normative data.
A total of 52 different assessment tools were identified: 41 cognitive instruments and 11 functional instruments.
The most mentioned assessment tests were the Mini Mental State Examination (64 different abstracts) and the Pfeffer Functional Activities Questionnaire (4 different abstracts). All the mentioned instruments and respective suggestions of adaptations or normative data can be found in Tables 2 and 3.
Many of them only describe the translation process to Portuguese, with some superficial suggestions of validation, replication, normative data or trans-cultural adaptation. Few of them developed the recommended procedures outlined earlier.
Many Brazilian authors have shown the influence of education on test scores: the Mini Mental State Exam-ination15, Verbal Fluency Test16, Boston Naming Test21,22, ADAS-Cog25, CERAD26,Mattis Dementia Rating Scale30,31.
Several dementia assessment tools were identified, where few of these have followed the recommended procedures of validation, replication, normative data or trans-cultural adaptation. In the context of research use this could be acceptable, but these procedures are absolutely necessary for epidemiological surveys.
Psychometric properties of scales and trans-cultural adaptations should be developed to minimize educational influence and decrease false positive diagnosis for cognitive impairment.
Health-care professionals should be trained to recognize and evaluate quality scales and psychometric concepts such as reliability (internal consistency and testretest), validity (construct, content, face and criterion validities), and sensitivity to change (responsiveness).
Methodological problems need to be addressed, particularly development of culture- and education-fair dementia diagnostic procedures.
Consensus on assessment and outcome tools would facilitate multi-center comparative studies. One method of achieving these research goals would be through a consensus conference.
Future research should emphasize functional State, quality of life, and caregiver burden, as well as economic factors and societal perspectives.
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From the Department of Psychobiology, Federal University of São Paulo, São Paulo, Brazil.
1 Post-graduate student;
2 Affiliated researcher;
3 Adjunct Professor and Head of Department.
Dr. Luciano G.Vasconcelos -
R. Embaú, 54 - 04039-060 São Paulo SP - Brazil. E-mail: firstname.lastname@example.org