Alzheimer's disease: what is it, how many people have it, and why do we need to know?

(99m)Tc-hexamethyl propyleneamine oxime brain perfusion single photon emission computed tomography in characterization of dementia: an initial experience in Indian clinical practice

There is a growing health burden in developing countries due to recent trends of increasing incidence of neurodegenerative diseases. To reduce the healthcare cost and effective management of dementia illness, early diagnosis, accurate differentiation and their progression assessment is becoming crucially important. We are utilizing ^99mTc-d, l-hexamethyl propyleneamine oxime (HMPAO) brain perfusion single photon emission computed tomography (SPECT) to characterize dementia on the basis of perfusion patterns and observed significant improvement in their management. Eleven patients (median age of 60 years range of 53-83 years) with clinical suspicion of dementia underwent ^99mTc-HMPAO brain perfusion SPECT. SPECT-computed tomography acquisition done, data are reconstructed, reviewed in three view and further processed in “neurogam” to get voxel based analysis and the comparison with age based normal database and surface mapping. Final diagnosis was done with clinical correlation. Four patients are diagnosed as Alzheimer's disease, two as frontotemporal dementia, one as dementia of Lewy bodies, two as vascular dementia and two as pseudodementia. All imaging findings are well-correlated with clinical background. Brain perfusion SPECT with HMPAO was very helpful to us in characterizing the patients of dementia by its perfusion pattern.

New tacrine analogs as acetylcholinesterase inhibitors - theoretical study with chemometric analysis

Computer simulations constitute the basis of the design and discovery of new drugs. This approach is not only significant with regards to finding new structures, but also for selecting the molecules with the highest probability of being useful in the diagnostic process and treatment of numerous diseases. In our work, we used computational software to analyze 32 new acetylcholinesterase (AChE) inhibitors and formulate ADMET predictions. To understand the influence of the structure of our derivatives on binding mode, we docked all structures to the active site of AChE and assigned some pharmacophoric features. Finally, we undertook a chemometric analysis of all the compounds on the basis of FT-IR, which gave us the possibility of performing a fast categorization of the analyzed compounds and design compounds with similar structures.

What do Korean American immigrants know about Alzheimer's disease (AD)? The impact of acculturation and exposure to the disease on AD knowledge

OBJECTIVE

The present study examined knowledge of Alzheimer's disease (AD) and factors related to the disease knowledge among Korean American immigrants.

METHODS

Two-hundred and nine middle-aged and older Korean American immigrants completed a self-administered questionnaire.

RESULTS

Korean American immigrants had strong stigma about AD and interpreted the disease as a form of insanity. They considered memory loss and AD as a part of the aging process. They seriously lacked knowledge about the treatment, diagnosis and cause of AD. Those who were less acculturated and less exposed to AD were likely to have poorer AD knowledge.

CONCLUSIONS

There is a need to expand AD education efforts among Korean American immigrants because the views of stigmatization and normalization of AD combined with certain Asian cultural norms can be barriers to early recognition and intervention. Our study suggests knowledge areas of concentration in AD education and a segment of the population that AD education should target. Further research on symptom knowledge by the disease stages and causal beliefs is needed to better understand the existing views about AD in Korean American immigrants.

2-deoxy-fluorglucose–positron emission tomography imaging of the brain: Current clinical applications with emphasis on the dementias

A number of very significant advances in the field of positron emission tomography (PET) imaging are now beginning to have an impact on clinical PET brain imaging. Among the most significant advances are further improvements in PET scanner detectors and computers. Increasingly, more sophisticated methods of image analysis and quantitation are also beginning to emerge. In addition, there has been a very rapid introduction of newer PET radiotracers that will ultimately work their way into the clinical environment. Finally, there is an expanding interest in the potential of PET brain imaging in the evaluation of a wide variety of clinical neuropsychiatric conditions.

Diagnosis-seeking at subspecialty memory clinics: trigger events

BACKGROUND

Research has shown that dementia often goes unrecognized, and diagnostic assessment is often further delayed. Understanding families' decision to seek care at memory clinics is relevant to efforts to facilitate early diagnosis.

OBJECTIVE

To examine the population seeking care at two memory clinics and the triggers causing caregivers to seek diagnostic assessment for a family member.

METHOD

We surveyed a consecutive sample of caregivers who accompanied a patient to an assessment at two university memory disorders clinics. Caregivers (n=416) described events that led them to seek a memory assessment for the patient, as well as who first suggested an assessment and diagnosis received.

RESULTS

Changes in the patient (cognitive, personality/behavioral, physical, or unspecified) accounted for 81% of 903 trigger events reported. Nearly half of the caregivers noting specific patient changes recorded some combination, rather than cognitive changes alone. Of the 338 respondents who noted a change in the patient as a trigger, 85% specified at least one cognitive change, while 40% specified at least one personality/behavioral change. Memory loss was most frequent trigger reported, followed by disorientation and recommendations (lay or professional). Caregivers themselves and non-specialist physicians were the most frequent sources of recommendations noted by all respondents.

CONCLUSION

A broad range of trigger events, beyond cognitive or symptomatic changes, caused caregivers to seek diagnosis at a memory clinic. Awareness of triggers significant to families may help physicians reduce the number and severity of events needed to convince caregivers a memory assessment is indicated.

Cognitive function and acute care utilization

OBJECTIVES

Little is known about variation in cognitive function across the aged population, or how use and costs of health care vary with cognitive impairment. This study was designed to create a typology of cognitive function in a nationally representative sample, and evaluate acute care use in relation to cognitive function, holding constant confounding factors. By including proxy assessments of cognitive function, this is the first study to include individuals unable to respond themselves.

METHODS

We analyzed the baseline year of the Asset and Health Dynamics Among the Oldest Old (AHEAD) survey, sponsored by the National Institute on Aging, to create three levels of cognitive function, using direct measures for self-respondents (n = 6,651) and proxy evaluations for the others (n = 792). We used a two-part model to predict the likelihood of using various health services and to evaluate intensity of care among users.

RESULTS

Sixteen percent, 64%, and 20% of the sample fell into the low, moderate, and high cognitive function groups, respectively, that differed significantly on almost all demographic and health status measures, and some utilization measures. Controlling for other health and functional status measures, lower cognitive function had a significant and negative effect on outpatient services, but did not affect hospital use directly.

DISCUSSION

Lower cognitive function may be a barrier to outpatient care, but these analyses should be repeated using administrative use and cost data.

Positron emission tomography and single-photon emission computed tomography brain imaging in the evaluation of dementia

The role of PET and SPECT brain imaging in the initial assessment and differential diagnosis of dementia is beginning to evolve rapidly. Numerous studies confirm the value of functional brain imaging, particularly with FDG-PET imaging, as a potentially cost-effective means of establishing an earlier diagnosis of Alzheimer's disease. Such an approach should allow for a more objective means of establishing which patients will benefit from treatment with cholinesterase inhibitors. In the future, neuroreceptor and plaque burden imaging studies should further enhance the sensitivity and specificity of dementia detection and patient management.

Genetically engineered mouse models of neurodegenerative diseases

Recent research has significantly advanced our understanding of the molecular mechanisms of neurodegenerative diseases, including Alzheimer's disease (AD) and motor neuron disease. Here we emphasize the use of genetically engineered mouse models that are instrumental for understanding why AD is a neuronal disease, and for validating attractive therapeutic targets. In motor neuron diseases, Cu/Zn superoxide dismutase and survival motor neuron mouse models are useful in testing disease mechanisms and therapeutic strategies for amyotrophic lateral sclerosis (ALS) and spinal motor atrophy, respectively, but the mechanisms that account for selective motor neuron loss remain uncertain. We anticipate that, in the future, therapies based on understanding disease mechanisms will be identified and tested in mouse model systems.

Essential information and support needs of family caregivers

The purpose of this study was to identify essential information and support needs of family caregivers for individuals with Alzheimer's disease or a related dementia, and to examine the relationship between caregiver characteristics and needs. Caregivers (n=128, response rate=49.4%) returned a survey detailing information needs, support needs, and personal information. The need for information concerning diagnosis/treatment and legal/financial issues was more important than general information about the disease. Specifically, information about health plan coverage was most important. Experienced caregivers also needed legal/financial information, as well as support. Female caregivers rated needs related to support as significantly more important than male caregivers. Practitioners should realize that caregivers may have different information and support needs and these needs may change throughout the caregiving experience.

Use of anticholinergic medications by older adults with dementia

OBJECTIVES

To compare the prevalence of anticholinergic use in older adults with probable dementia with that of a matched comparison group of older adults who were unlikely to have dementia and to examine the extent to which patients taking donepezil concomitantly use anticholinergic medications.

DESIGN

Retrospective study.

SETTING

Community-based older adults receiving medications through a pharmacy benefit management company.

PARTICIPANTS

Eight hundred thirty-six patients aged 65 and older. Patients taking donepezil (n = 418) constituted the treatment group. Patients not taking donepezil (n = 418) constituted the comparison group. Each treatment group member was matched with a comparison group member on the basis of age, sex, and number of drugs taken for chronic conditions.

MEASUREMENTS

The prevalence of anticholinergic use was compared in the treatment and comparison groups over a 3- to 12-month follow-up period using pharmacy claims data. The proportion of follow-up period days that treatment group members concomitantly used donepezil and anticholinergics was also examined.

RESULTS

Older adults with probable dementia were more likely to use anticholinergics than matched comparison group patients (33.0% vs 23.4%; P =.001). Of treatment group members receiving anticholinergics, 26.1% used multiple anticholinergic medications. Treatment group members who received anticholinergics used those drugs concomitantly with donepezil on a mean of 28.4% of follow-up period days.

CONCLUSIONS

Community-based, commercially insured, older adults with probable dementia are more likely to take anticholinergics than matched controls. Patients taking donepezil frequently use an anticholinergic medication concomitantly. This study suggests that prescribing for older adults with dementia could be improved, especially if cognitive enhancing agents are being considered.

The parent they knew and the "new" parent: daughters' perceptions of dementia of the Alzheimer's Type

Psychosocial death is a significant dimension of the Dementia of the Alzheimer's Type disease process but poorly studied. This article explores three phases of psychosocial death that emerged from in-depth interviews with three daughters caring for a parent with this chronic illness. The phases discussed include: (1) daughters creating a new relationship with their parent; (2) daughters grieving chronically throughout the illness; (3) daughters negotiating coherence between the parent that once was and the parent that exists now. Daughters' narratives reveal that witnessing the deterioration of a mind was a burdensome grave learning process that encompassed many losses. These daughters lacked appropriate education and support. Future research in this area is required to develop strategies for informal caregivers that respond to this disease process.

Single photon emission CT and positron emission tomography in the evaluation of neurologic disease

Widely available SPECT allows imaging of certain critical components of neurotransmission, providing clinically and experimentally significant information. Future efforts may be directed toward developing innovative techniques to delineate dynamic neurochemical changes in vivo.