Vascular Dementia Frontotemporal Dementia Other Neurodegenerative Disorders CJD Subcortical Dementia Parkinsons Disease DLB Huntington Disease HIV /AIDS complex MND Shanker Waghray Consultant Old Age Psychiatry Vascular dementia No definite definition A preferred term now is Vascular Cognitive impairment Second most common single cause of Dementia. Prevalence rates vary from 9-14% depending on criteria used . Aetiology Large artery disease Cardiac embolic events Small vessel disease, Haemorrhages Specific arteriopathies Risk factors Vascular HTN, MI, Diabetes, Lipid abnormalities ,smoking Demographics Increased Age , Low education Genetic family history Stroke related factors . Type of CVD . Site and size of infarcts C/F of VaD Insidious onset , often stepwise deterioration, maybe relatively abrupt. Neurological findings indicating focal lesions ,bulbar signs, Gait disorders, Psychomotor slowing ,abnormal executive functioning . Depression , anxiety ,emotional labiality Relatively preserved personality with insight in mild and moderate cases Investigation and Treatment CT scan ----Focal infarcts , WML SPECT ---Reduction of regional blood flow and decreased white matter flow No specific lab test ACHEI have been used in trials but not licensed Non Cognitive features similar to Alzheimer's and treatment is same Fronto temporal Dementia . Insidious course Onset between 35-70 years Personality and behaviour changes occur early rather than cognitive changes. Aetiology Unclear. Frontotemporal dementia Lund Manchester criteria Behaviour disorder Insidious onset, slow progression, early loss of insight, loss of social and personal awareness ,mental rigidity ,disinhibition ,lack of judgement, impulsivity , stereotyped repetitive behaviour, Impulsivity. Affective symptoms Depression ,Hypochondriasis, emotional bluntness, lack of empathy, Speech disorder reduction of speech ,stereotypy ,echolalia . Receptive speech preserved, late mutism. Physical signs –Early incontinence ,Rigidity, Tremor, Low and labile blood pressure. CT and MRI show frontal and /or temporal cortical atrophy and deep white matter lesions .Functional Imaging is helpful Neuropsychological tests show slow verbal production and relatively intact reasoning and memory while intellectual and motor speed is reduced . Memory disturbances are found at an early stage but LTM is less affected compared to Alzheimers. Creutzfeld-Jacob Disease Rare and rapidly progressive Onset between 45-75 years. Affects 0.3-5 cases/million Subtypes Sporadic Genetic Iatrogenic New Variant CJD CJD Sporadic Rapidly progressive Dementia Myoclonus Ataxia Visual Disturbances Multifocal CNS failure Death due to Bronchopneumonia Mean duration is 8 months .Only 4% survive upto 2 years CJD Genetic Autosomal Dominant Occurs a decade earlier than sporadic Features are much the same as sporadic CJD Iatrogenic Fortunately rare Due to inadvertent inoculation with human prions during medical procedures First described in a patient receiving corneal graft Contaminated instruments are other causes Rapidly progressive dementia New Variant First described in 1996 Age is lower(29) Causal link to BSE Risk to humans minimal. Depressed ,withdrawn, fleeting delusions ,behaviour disturbances, Cognitive impairment ,involuntary movements ,incontinence,aggression,auditory and visual hallucinations . increased dependency, mutism . progresses rapidly Investigations EEG –2HZ generalised bi/triphasic periodic complexes .Serial EEGs may be required MRI shows atrophy of brain and Increased signal in basal ganglion Treatment No treatment can halt the progress of CJD Myoclonus can be treated with Na Valproate Mg, Amantidine ,Interferon have been tried Patients can be treated in an open ward Barrier nursing is not required All samples can be treated as normal Mean duration is 8months Subcortical Dementias Cortical Subcortical Aphasia early No Aphasia Recall and Recognition Recall impaired, Impaired Calculation Involved early Euthymic mood Motor speed normal Personality unconcerned Recognition better Calculation preserved until late. Depressed mood Motor speed slowed Apathetic personality J.Cummings Pure Subcortical Syndrome Slowed Information Processing Impaired Executive Function Apathy Impaired recall with relatively persevered recognition (retrieval not encoding deficit) Gait Disorder Parkinson's Disease James Parkinson 1812 Commonest degenerative disease after Dementias. 1% Lifetime risk . Common between 50-70yrs of age rare <40. No upper age limit . Due to loss of pigmented cells in SN widespread distribution so autonomic dysfunction and degeneration is seen Amyloid Plaques and NFTs are seen Clinical Features Insidious Onset Tremor---more in upper limb.<by action >by emotion Bradykinesia /lead pipe rigidity Gait –festinating . Monotonus speech. Mask like Facies. Micrographia ---Writing tails off towards the end of a sentence. Dementia in PD Common executive dysfunction precede Motor symptoms eg: working memory, attention ,verbal fluency. ----Detected by tests of planning ,spatial working memory. Reflects dopaminergic dysfunction in front striatal networks Cognitive impairment is seen in 10%. Progresses to Dementia in 60%--same as non PD . Predictors of Dementia at initial diagnosis Age /Motor impairment/Impaired semantic fluency/Impaired pentagon copying . Dementia Was not considered part of the original definition Wide variation of prevalence---Seen in 23----41% risk of developing Dementia is 6 times more than in non PD. Risk factors –Males ,Low education, Depression ,Hallucinations ,Older age ,family history of Dementia, Motor impairment ,Impaired verbal fluency, impaired pentagon copying . Rigidity and postural disorders are more related to subsequent Dementia than tremors . In Early PD Two types of Cognitive impairment. a) Executive deficits (due to frontostriatal dysfunction )– likley to fluctuate with disease course but not clearly associated with dementia b) Posterior cortical deficits Lewy body disposition or AD type pathology Maybe – there is multiple Dementia syndromes in PD PDD Cognitive deficits in late PDD are similar to LBD Marked visuospatial dysfunction ,Fluctuating cognition ,Executive dysfunction ,working and episodic memory ,Language relatively well persevered particularly object naming . Visual hallucinations Sleep disturbances Diagnosis MMSE not entirely diagnostic CAMCOG and CAMDEX are more sensitive tests In later stages cortical features are seen Diagnosis of PDD is made in patients with PD who develop dementia >1year later If <1year it is DLB Treatment Rivastigmine and to some extent Galantamine have been found useful For non cognitive symptoms no one drug is available Symptomatic treatment Dementia of Lewy body(DLB) Now the preferred term Spectrum of disease Three broad patterns a) Nigrostriatal involvement -----motor symptoms of Parkinsons b) Cortical involvement producing cognitive decline c) Sympathetic nervous system involvement producing autonomic failure . Accounts for just under 20% of all Dementias . M:F ratio is 1.5:1 Dementia –Lewy Body Consensus Diagnostic criteria Progressive cognitive decline and two of the following core features a) Fluctuating cognition with variations in attention and alertness b) Visual hallucinations –well formed c) spontaneous motor features of Parkinson's Supportive Features falls, syncope ,sensitivity to neuroleptics, systematized delusions, Hallucinations in other modalities. Imaging WMH and periventricular lesions are seen SPECT shows Dopamine transporter loss in caudate and Putamen and is a marker of nigrostriatal degeneration Treatment For Cognitive ----ACHEI all three have ben tried with good results For non cognitive need to be careful due to sensitivity –Atypicals have been used . Huntington's Disease First described in 1872 Prevalence is 5.5/100000 Occurs world wide Males>Females Genetics Single autosomal gene with high penetrance ---on short arm of chromosome 4 Family history not always forthcoming New mutations can occur but rare. HD Occurs in 4th to 5th decades so prevention is difficult Prenatal testing is now available by molecular genetic testing . Reduced level of GABA in Basal Ganglia and substantia Nigra Cholinergic neurons are severely deficient in the Striatum Motor symptoms Chorea is the predominate feature Rapid non repetitive contractions involving orofacial ,truncal areas and limbs and worsens with anxiety. Cannot be controlled voluntarily but is early stages patients integrate this movements with purposeful actions Gait abnormalities and dysarthria occurs later. Difficulty with walking, turning , Falls Dementia in HD Dementia is insidious and no impairment is seen in asymptomatic carriers. Psychomotor slowing Depression Executive functioning ,language ,perceptual and spatial skills are all affected Verbal recognition memory ,word recognition and object naming remain intact so communication is possible initially Language may become impaired in later stages. Memory deficits are common , Problem is with acquiring and retrieving memories rather than retention. Appear early –can predate the motor symptoms Basal ganglia and fronto striatal connections are involved in memory deficits. Imaging and course CAT scan shows caudate atrophy. MRI shows reduced volumes of Thalamus and medain temporal structures. SPECT shows reduced blood flow in basal ganglia Course is longer than other Dementias –15-30 years is average No drug treatment ---Symptomatic treatment C/F First reported in 80s.Virus isolated in 1983 Sero conversion occurs in 50-90% of cases 2-4 weeks after exposure. Mild fever ,myalgia ,sore throat ,lymphadenopathy is seen and subsides within 2 weeks. Asymptomatic phase lasts for 2-10years during which the person remains infective Constitutional symptoms eg fever ,night sweats ,weight loss is seen. Opportunistic infections take over. Nervous system is an early target with viral ,fungal and parasitic infections . HIV/AIDS Dementia complex Term coined in 1986 by Navia et al Cognitive and behavioural changes with motor deficits are common Lethargy and social withdrawal can be mistaken for depression Dementia is seen in 60% and occurs early with minimum systemic manifestations Onset can be insidious or abrupt poor concentration and memory are early symptoms and can be mistaken for systemic illness or depression STM is poor but LTM is good and patients are good at confabulating and so appear normal Asymptomatic HIV positive patients performed poorly on tests of abstract thinking ,learning ,memory and speed of information processing. Severe global impairment is seen in half of the cases within 2 months . Insight is preserved till late . Final stage is marked by severe global dementia. Imaging and Treatment MRI shows areas of increased T2 signals in white matter PET shows subcortical hypo metabolism with progression to cortical areas . SPECT shows perfusion deficits Treatment Antiretroviral Motor Neurone Disease Disorder of unknown aetiology . Males>females 50-70 years 5-6%have an affected relative. Occasional families show autosomal inheritance Gene is localised to chromosome 9 also 17and 3 Insidious onset with atrophy of small muscles No sensory change Patients survive 2-3 years Dementia Was considered rare. Testing may reveal deficits in memory Dementia is of frontal lobe type and begins 6-12 months before wasting begins Personality changes with disordered conduct ,stereotyped behaviour ,reduced verbal output . Progressive language difficulties with stereotyped phrase, echolalia and finally mutism Imaging Atrophy is seen in neocortices ,amygdala and basal ganglia. PET scan shows reduced blood flow in frontal areas . No cholinergic deficit NO SPECIFIC treatment -----symptomatic Thank You