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An Approach to Diagnosing and Managing Dementia
1. AN APPROACH TO A CASE OF DEMENTIA
Moderater :-Dr.Arun Joshi (MD) Prof Head of Deptt
General Medicine
Presented By:-Dr.Subeg singh (PGJr2)General Medicine
2. DEMENTIA
ā¢ Cognitive function declines with aging
ā¢ ā¢ Age-related decline - cognitive speed, and working memory
ā¢ ā¢ General knowledge and vocabulary - stable or improve while
problem solving and reasoning decline
3. DEMENTIA
ā¢ DEMENTIA- the disease with acquired deterioration in cognitive/
intellectual abilities without impairment of consciousness.
ā¢ Cognitive deficit represent a decline from previous level of
functioning
4. ā¢ Dementia-characterised by multiple cognitive deficits of sufficient
severity to interfere with function during daily activities.
ā¢ DSM V criteria describe cognitive impairment and dementia in
neurocognitive disorders.
ā¢ An essential part of assessment is exclusion of depression or
delirium.
6. DSM CRITERIA FOR DEMENTIA
ā¢ 1. Memory impairment
ā¢ 2. At least one of the following:
ā¢ Aphasia
ā¢ Apraxia
ā¢ Agnosia
ā¢ Disturbance in executive functioning
ā¢ 3. Disturbance in 1 and 2 interferes with daily function
ā¢ 4. Does not occur exclusively during delirium
7. ā¢ ā¢ Alzheimer's disease is most
common dementia 50-75%
ā¢ ā¢ Dementia with Lewy bodies
15 to 35 %
ā¢ ā¢ Vascular dementia 5 ā 20 %
ā¢ EPIDEMIOLOGY
ā¢ ~ 5 to 8 % at age 65 to 70
ā¢ ~ 15 to 20 % at age 75 to 80
ā¢ up to 40 to 50 % over age 85
8.
9. CORTICAL VS. SUBCORTICAL DEMENTIA
ā¢ Subcortical
ā¢ Symptoms: behavioral changes, impaired affect and mood, motor
slowing, executive dysfunction, less severe changes in memory, extra
pyramidal findings.
ā¢ Affected brain regions: thalamus, striatum, midbrain, striatofrontal
projections.
ā¢ Examples: Parkinsonās disease, progressive supranuclear palsy, normal
pressure hydrocephalus, Huntingtonās disease, Creutzfeldt-Jakob
disease, chronic meningitis.
10. REVERSIBLE CAUSES DEMENTIA
ā¢ D = Delirium
ā¢ E = Emotions (depression)& Endocrine Disease
ā¢ M= Metabolic Disturbances
ā¢ E = Eye & Ear Impairments
ā¢ N = Nutritional Disorders
ā¢ T = Tumors, Toxicity, Trauma to Head
ā¢ I = Infectious Disorders
ā¢ A= Alcohol, Arteriosclerosis
12. Mild Cognitive Impairment (MCI)
ā¢ MCI - an in-between state of normal aging and dementia.
ā¢ ā¢ In MCI, cognitive change is greater than expected for age
ā¢ ā¢ Independence & ADL are preserved
13.
14.
15. MCI
MILD COGNITIVE IMPAIRMENT
ā¢ Subtyping MCI into amnestic and nonamnestic categories has
predictive value.
ā¢ ā¢ The vast majority of aMCI -AD dementia
ā¢ ā¢ naMCI āDLB, FTD, vascular dementia, and even Alzheimer dementia
16. MCI
ā¢ Annual risk in the elderly
ā¢ Gen. -1%ā2%
ā¢ MCI(clinic setting) - 10%ā15%
ā¢ In population-based studies - 5%ā10%
ā¢ ā¢ A diagnosis of MCI even with reversion to normal has prognostic
value MCI
17. Preclinical Stage of Dementia
ā¢ Pathophysiological processes can begin decades prior to cognitive
symptoms.
ā¢ An evolving understanding of the preclinical stages possible
therapeutic time window.
ā¢ e.g. CSF AĪ² 42 decreases ā 25 years before expected symptom onset
in AD.
ā¢ Preclinical stages of FTD have not been studied as much as AD.
18. Biomarkers predicting the risk of conversion Of
MCI to dementia
ā¢ MRI-MCI with hippocampal volumes -25th percentile ā 2 to 3 times
risk compared 75th percentile.
ā¢ CSF-ā AĪ² 42 and ā t-tau and p-tau.
ā¢ APOE4 allele.
ā¢ Temporal-parietal hypometabolism on FDG-PET.
ā¢ Amyloid deposition on AĪ² PET imaging .
19. DEMENTIA
ā¢ ā¢ 35.6 million worldwide in 2010- number would double
approximately every 20 years (Prince et al., 2013).
ā¢ ā¢ Rotterdam study,UK, Rochester- indicate the incidence of dementia
may be declining.
ā¢ ā¢ One possible explanation -improved treatment of vascular risk
factors.
20. I.Syndrome of progressive dementia(other
neurologic signs absent or inconspicuous)
ā¢ Alzheimer disease
ā¢ Some cases of Lewy-body disease
ā¢ Frontotemporal dementias-Pick disease, includin behavioral variant,
primary progressive aphasias (several types)
21. II. Syndrome of progressive dementia (in
combination with other neurologic abnormalities)
ā¢ Huntington disease (chorea)
ā¢ Lewy-body disease (parkinsonian features)
ā¢ Corticobasal ganglionic degeneration (rigidity, dystonia)
ā¢ Dementia-Parkinson-amyotrophic lateral sclerosis complex
ā¢ Cerebrocerebellar degeneration
ā¢ Familial dementia with spastic paraparesis, amyotrophy, or
myoclonus
ā¢ Polyglucosan body disease (neuropathy)
ā¢ Frontotemporal dementia with parkinsonism or ALS
22. TYPES OF DEMENTIA
ā¢ Cortical Dementia
ā¢ Subcortical Dementia
ā¢ Progressive Dementia
ā¢ Primary Dementia
ā¢ Secondary Dementia
ā¢ 1)damage to the brain that affects the cortex of the the brain or the outer layer (causes problems
with memory, language, thinking, and social behavior
ā¢ 2)dementia that affects parts of the brain below the cortex (causes changes in emotion, and
movement)
ā¢ 3)Dementia that only gets worse and starts to affect ones ability to do everything activities
ā¢ 4)dementia like Alzheimerās disease and doesnāt result from any other disease
ā¢ 5)dementia that is caused from physical disease or injury (can affect people with other disorders
that affect mobility and functions like parksins
23. HOW TO DIAGNOSE A CASE OF DEMENTIA
ā¢ Clinical history
ā¢ Symptoms analysis
ā¢ Focussed physical examination
ā¢ Cognitive and neuropsychiatric examination
ā¢ Laboratory evaluation
25. FOCUSED HISTORY
ā¢ Chronology of the problem- from loved ones
ā¢ - mode of onset ā abrupt vs gradual
ā¢ - progression - stepwise vs continous decline
ā¢ - duration of symptoms
ā¢ Medical history
ā¢ Family history
ā¢ Socio-economic history
ā¢ Evaluation for toxic agent exposure
31. ALZHEIMERS DISEASE
ā¢ ALZHEIMERāS DISEASE (AD)
ā¢ About 70% of all cases of dementia in elderly
ā¢ Incidence increases with age
ā¢ Occurs in up to 30% of persons >85 years old
ā¢ Characterized by:
ā¢ Progressive loss of cortical neurons
ā¢ Formation of amyloid plaques (beta-amyloid is major component)
and intraneuronal neurofibrillary tangles (hyperphosphorylated tau
proteins is major constituent)
32. ā¢ DIAGNOSTIC CRITERIA FOR DEMENTIA OF THE ALZHEIMER TYPE (DSM-IV)
ā¢ A. Development of multiple cognitive deficits
ā¢ 1. Memory impairment
ā¢ 2.other cognitive impairment
ā¢ B. These impairments cause dysfunction in In social or occupational
activities
ā¢ C. Course shows gradual onset and decline
ā¢ D. Deficits are not due to:
ā¢ 1. Other cns conditions
ā¢ 2. Substance induced conditions
ā¢ E. Do not occur exclusively during delirium
ā¢ F. Are not due to other psychiatric disorder
33. Alzheimer Pathophysiology
ā¢ AĪ² is derived from APP through proteolytic processing
ā¢ Removed efficiently by a number of mechanisms
ā¢ Drained through the cerebral vasculature and into the CSF via the
glymphatic system.
34. CLINICAL MANIFESTATION
ā¢ Begin with memory impairment - language, visuospatial skills
ā¢ Anosognosia- unaware of difficulties
ā¢ Cognitive decline-driving,shopping,house-keeping
ā¢ Language impaired- naming,comprehension then - fluency
ā¢ Apraxia- seq. motor task canāt perform
ā¢ Visuo spatial deficits
ā¢ Delusions ,capgras syndrome ā late stages
ā¢ End stage-rigid,mute ,incontinent & bed-ridden
35. ā¢ Neurological exam & neuropsychological testing
ā¢ Brain imaging: brain atrophy due to extensive neuronal loss and
hippocampal atrophy.
ā¢ Diagnosis confirmed by histology of post-mortem brain.
ā¢ āPlaquesā & ātanglesā in hippocampus & cerebral cortex.
36. Biomarkers in AD- CSF Biomarkers
ā¢ ā CSF AĪ² 42 and ā CSF tau protein - sensitivity of 85% and
specificity of 86% for AD.
ā¢ These biomarkers can improve diagnosis in and predict conversion
from MCI to AD.
ā¢ Data on the progression from normal or preclinical AD are
accumulating but are not ready for clinical use at this time.
37.
38. Neuroimaging Biomarkers
ā¢ MRI āvery useful in the differential diagnosis of dementia and as a
biomarker in AD dementia.
ā¢
ā¢ Medial temporal lobe atrophy of the hippocampus and entorhinal
cortex with dilatation of the temporal horns.
ā¢ Reduction in hippocampal volumes correlates with NFT pathology at
autopsy and cognitive decline
39. ā¢ Medial temporal lobe atrophic in early AD and later in the disease
atrophy rates are greater in the temporal, parietal and frontal
cortices.
ā¢ White matter hyperintensities (FLAIR or T2 MRI) also appears to
contribute to cognitive impairment in AD.
40. Cerebral Amyloid Angiography
ā¢ Hypointense signal on MRI GRE - hemosiderin deposition -
microhemorrhages.
ā¢ In the Alzheimerās Disease Neuroimaging Initiative (ADNI). AĪ² load as
measured by PiB-PET
ā¢ CAA preferentially involves the occipital lobe.
41. Tau Imaging
ā¢ Tau comprises the other hallmark of the AD pathological process,
neurofibrillary tangles
ā¢ The ability to image it in vivo would be extremely useful.
ā¢ Also implicated in a variety of other disorders
ā¢ Specificity for tau and various tau isoforms??
42. Treatment-non pharmacological
ā¢ Avoiding prior triggers
ā¢ Limiting changes to the environment
ā¢ Regular exercise, and shifting attention.
ā¢ Aromatherapy
ā¢ Music therapy-reduces agitation
43. Passive immunization
ā¢ Bapineuzumab- first humanized monoclonal antibody
ā¢ Solanezumab- specific to (Ab16ā24)
ā¢ Gantenerumab- specifically bind to aggregated Ab
ā¢ Crenezumab - a novel human IgG4 monoclonal antibody
ā¢ Reduced pro-inflammatory activity ālow risk of vaso.edema.
ā¢ Currently, a phase II trial of crenezumab (NCT01343966) is ongoing in
patients with mild to moderate AD
44. TREATMENT
ā¢ Acetylcholinesterase Inhibitors
ā¢ N-Methyl-D-aspartate Receptor Antagonist
ā¢ Vitamin E- large double-blind RCT -mild to moderate AD-less decline
and delay in progression of about 19% per year without an increase in
mortality with high-dose vitamin E
45. VASCULAR DEMENTIA
ā¢ Refers to cognitive decline caused by ischemic, hemorrhagic, or
oligemic injury to the brain as a consequence of cerebrovascular or
cardiovascular disease.
ā¢ Part of a spectrum of vascular disease causing cognitive impairment,
which also includes mild cognitive impairment of vascular origin &
mixed Alzheimer's disease plus cerebrovascular disease.
49. FRONTO TEMPORAL DEMENTIAS
ā¢ Often begins with marked behavioral disturbances, unlike AD
ā¢ Classic form ā Pickās disease
ā¢ Patients frequently hot-tempered and socially disinhibited
ā¢ memory & visuo spatial skills spared
ā¢ Impaired planning,judgement and language
ā¢ Echolalia +
ā¢ Overlap with PSP,CBD, motor neuron disease
ā¢ Illness progresses for years, like AD
ā¢ Inevitable decline
ā¢ MRI- lobar atrophy of frontal and/or temporal
ā¢ About 50% of patients have family history
50.
51. DIFFUSE LEWY BODY DISEASE
ā¢ Patients have clinical parkinsonism with early and prominent
dementia.
ā¢ Lewy bodies found in brain stem, limbic system, and cortex.
ā¢ Visual hallucinations and cognitive fluctuations common, capgras
syndrome & REM sleep disorder.
ā¢ Longstanding PD without cognitive decline develop dementia.
ā¢ Better memory but severe visuospatial deficit.
ā¢ Patients sensitive to adverse effects of neuroleptics.
ā¢ May be second most common cause of dementia after AD.
52.
53. PARKINSONāS DISEASE
ā¢ About 50% of patients have dementia by 85 years old.
ā¢ Affects executive function disproportionately.
ā¢ Dementia occur in later stage, or as a result of co morbidities-AD,DLB
or side effects of drug.
ā¢ Associated depression & anxiety.
ā¢ Frontal lobe dysfnct- complex tasks,planning, -memorizing.
ā¢ Language & mathematical skills spared.
ā¢ Predictors- late onset,akinetic-rigid,severe depression - advanced
stage
54. ā¢ CRUETZFELDT-JAKOB SYNDROME(CJD)
ā¢ Rapid progressive dementing prion disorder.
ā¢ Focal cortical signs, rigidity.
ā¢ Onset between 40- 75 years.
ā¢ 90% has MYOCLONUS vs 10% in AD.
ā¢ Progressive dementia and personality changes over weeks to months
Death <1 year from first symptom.
ā¢ EEG- diffuse slowing and periodic sharp waves or spikes.
ā¢ MRI- basal gangla abnormalities.
ā¢ CSF- detect specific aminoacid sequence (PrPSc)
55. DISORDERS OF MEMORY FUNCTION
(AMNESTIC DISORDERS)
ā¢ Aging-
ā¢ Mild loss of memory: names and dates.
ā¢ Most sensitive indicator of cognitive change: poor performance on
delayed-recall tasks.
ā¢ Verbal fluency remain intact and vocabulary may increase
56. Transient global amnesia-
ā¢ Dramatic memory disturbance.
ā¢ Affects patients >50 years.
ā¢ Usually have only one episode, lasting 6 to 12 hrs.
ā¢ Complete temporal and spatial disorientation.
ā¢ Orientation for person preserved.
ā¢ May be confused with psychogenic amnesia, fugue state, or partial
complex status epilepticus.
ā¢ May be due to vascular insufficiency to hippocampus or midline
thalamic projections
57. ā¢ Head injury
ā¢ Retrograde amnesia > antegrade amnesia.
ā¢ With time, memories usually return but rarely to recall events surrounding
trauma.
ā¢ Korsakoffās syndrome
ā¢ Near-total inability to establish new memory.
ā¢ Patients confabulate about recent events.
ā¢ Immediate memory N,attention N.
ā¢ Most common cause: thiamine and other nutritional deficiencies with
chronic alcoholism
59. REFERENCES
ā¢ Principles Of Neurology;Adams and Victor;10th edition.
ā¢ Harrisonās principles of Internal medicine 19th edition chapter no 448
,35 page no 170,2570.
ā¢ Davidsonās principles & practice of medicine 22ndchapter no 25 page
no 1432.
ā¢ API Text book of medicine 10th edition .
ā¢ Chamberlainās symptoms & signs in clinical medicine 13th edition
ā¢