Download - New treatment trends in alzheimer disease
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NEW TREATMENT TRENDS IN ALZHEIMER DISEASEGUIDE: DR.APOORVA PAURANIKCANDIDATE: DR.SARATH MENON.R
Dept. of Neurology,
MGM MEDICAL COLLEGE,INDORE
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OUTLINE
Treatment of AD Treatment of secondary symptoms Experimental therapy Dietary measures Social support Prevention
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ALZHEIMER DISEASE
Most common cause for dementia
24 milions has the disease at present
Incidence doubles every 5 yr after age of 60.
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RISK FACTORS FOR ALZHEIMER’S DISEASE
Age Family history Lifestyle Physical exercise Mental exercise Diet Tobacco Head injury Hypertension Elevated serum cholesterol Elevated serum homocysteine
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PATHOPHYSIOLOGY
Beta amyloid plaques
Neurofibrillary tangles (NFT)
Amyloid formed from APP (amyloid precursor protein) by secretase NFT - silver stained fibrils of abnormally phosporylated Tau protein
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BIOCHEMICAL CHANGES
Decrease in cortical level of Acetyl choline,choline acetyl transferances,nicotinic receptors
Degeneration of cholinergic neurons in nucleus basalis of Meynert.
Degenertion of loculus ceruleus & dorsal raphe
- noradrenergic & serotonergic depletion
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CASCADE OF MECHANISM
Amyloid
inflammation abnormal tau phosphorylation
free radical toxicity
synaptic loss
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CASCADE OF MECHANISM
cholinergic dysfunction
neuronal loss
norepinephrine dysfunction
serotonergic dysfunction
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CURRENT TREATMENT
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Symptomatic - Cognitive
- Behavioral
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TREATMENT OF MILD-MODERATE AD
Choline esterase inhibitors - Donepezil - Rivastigmine - Galantamine
Improves cognition & daily activities
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TREATMENT OF SEVERE AD
NMDA antagonists - Memantine
Slows intracellular Ca accumulation and delay nerve damage
Used in combination with Donepazil
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DOSAGE Donepezil – 5mg/day x 4-6 wks,then 10mg/d to max.tolerated dose. min dose-5mg/d
Rivastigmine – 1.5mg bd,then step up monthly to 6mg bd(max). min.dose-6mg/
Galantamine- 8mg/d,monthly increase to 16mg/d 24 mg/d (max). min dose- 16mg/d Memantine – 5mg daily,in a week then 5mg Bd 15mg/d- (5 & 10), max dose-10mg
bd
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CURRENT AVAILABLE THERAPY
characteristic
DONEPAZIL RIVASTIGMINE
GALANTAMINE
MEMANTINE
Chemical class
piperidine carbamate phenanthrenealkaloid
Similar to amantadine
Primary mechanism
AchE inh AchE inh AchE inh NMDA antagonist
Other mechanism
None
None Nicotine modulator
HT3 receptor antagonist
Half life 70 h 90 min 7 h 70 h
Metabolism Hepatic Renal Hepatic Hepatic
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Combined clinical trial data for the three licensed acetylcholinesterase inhibitors: rivastigmine (♦), donepezil ( ) and galantamine (•) versus placebo (▪). ▴
BULLOCK R BJP 2002;180:135-139
©2002 by The Royal College of Psychiatrists
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CURRENT STATUS OF ACHE INHIBITORS
Effective in 6 month & 12 month trials Early initiation of therapy Delay institutionalization Decrease troublesome behaviours
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TREATMENT OF SECONDARY SYMPTOMS
Behavioural intervention Neuroleptic agents - FDA in 2005 black box warning for atypical neuroleptics - 2008 , haloperidol,chlorpromazine, thioridazine included -CATIE-AD study showed cognitive decline with atypical neuroleptics -recommended in low doses in frail, elderly
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Antidepressants & mood stabilizers -citalopram ( Nyth et al study) - 20 mg /day in elderly ,max-40mg - sertaline & fluvoxetine – no
benefits (Wintraub & Petrecca et al study) - mirtazipine has no benefial effect ( Banerjee et al) Anticonvulsants - gabapentin,valproate can be
used
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Anti inflammatory agents - NSAIDs delay onset of AD - Breitner et al showed NSAIDs don’t protect against AD in very old A double blind,placebo controlled trial ( Grundman et al 2003) showed rofecoxib & naproxen don’t delay AD progression
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EXPERIMENTAL THERAPY
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Anti amyloid therapy - vaccination with amyloid species - monoclonal anti amyloid antibodies - IVIG containing amyloid binding antiboies - selective amyloid lowering agents - chelators of amyloid polymerization - beta secretase inhibitors
Till date no phase 3 trials for anti amyloid therapy shown acceptable efficacy
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VACCINATION Anti Abeta immunotherapy reduces amyloid
deposition and improved spatial cognition in mice
Clinical trial in 298 patients with AD:18 developed inflammatory meningoencephalitis: study halted
Autopsy in one: “less amyloid than expected”
Orgogozo J-M et al Neurology 2003;61:46 Mathews P & Nixon R Neurology 2003;61:7
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VACCINATION In subgroup of 30 patients, those who
generated Abeta antibodies had reduced disease progression
Attempts being made to reformulate vaccine Passive immunization considered
Hock C et al.Neuron 2003;38:547 Wolfe MS. Nat RevDrug Discov 2002;1:859
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ANTIBIOTICS FOR AD Higher than normal titres of Chlamydia in
people with AD Multicentre Canadian double blind placebo
controlled RCT 101 patients with mild to moderate AD
(MMSE 11-25) Daily doxycycline 200mg plus rifampin
300mg or placebo for 3 months
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ANTIBIOTICS FOR AD
Standardized ADAS Cog @ 6 months difference of 2.75/70 between treated and placebo group (significant @ 6 but not 12 months)
Standardized MMSE score 2.2/30 higher @12 (but not 3 or 6) months
Intriguing results! Larger study in planning stages
Loeb M, Molloy DW et al JAGS 2004;52:381
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SECRETASE INHIBITORS
Inhibit production of Amyloid Tarenflurbil and Semagacestat. Two placebo controlled trials showed no
efficacy
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Reversal of excess Tau phosphoryation Free radical scavengers - vitamin E – reduce oxidative stress - high dose Vit E (2000U/day) for 2 yr slowed progression of AD ( large double blind placebo trial ,Sano etal 1997) - Alzheimer Disease Cooperative Study ( 769 pts) showed no benefit vs placebo (Peterson etal
2005) - cause cardiovascular side effects - not recommended currently
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Estrogen replacement therapy - postmenopausal woman - RCT with 351 pts for 2 weeks showed
no beneficial effects
Cholesterol lowering agents -no beneficial effects - RCT,double blinded study with 748
pts for 6 months failed to prove efficacy
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LIPID LOWERING AND AD Previous observations suggested lower risk of AD
in those taking “statins” Recently presented at 8th International Symposium
on Advances in AD therapy Atorvostatin treatment associated with less
decline in memory, function, mood & behaviour in people with AD
Premature to decide until full details available in peer reviewed publication
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ONGOING TRIALS
Tramiprosate (Alzhemed) - homotaurine - binds to soluble & insoluble Abeta
and in reduction - protect against amyloid neurotoxicity - reduce tau abnormal phosphorylation
RCT, double blind,placebo conrolled trial (2009)
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Cerebrolysin - peptidergic drug from purified pig brain - neurotrophic & neuroprotective
RCT,double blind, placebo controlled trial (2010)
Latreperidine(Dimebom) - anti histamine - inhibit burylcholine esterase, AchE, NMDA signalling pathway RCT, phase 3 trial ongoing ( jan 2011)
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CLINCAL TRIALS - COMPLETED
Selegelline RCT trial conducted in 2010 failed to give promising results Nimodipine - prevent Ca accumulation in neurons - cause vasodilation - RCT in March 2010 in 500 pts showed positive results - given 90mg/d & 180mg/d for 12,24,52
weeks - improves cognition & global impression
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Metal protein attenuating compound(MPAC) (clinoquinol) - solubilize & clearance of Abeta - RCT,double blind study with 36 pts has no change in ADAS Cog @ 36 wks. Mertrifonate - irreversible AchE inhibitor - RCT, double blinded phase 3 study - 60-80mg/d for 26 weeks showed
improvement MMSE-1.86/30 & ADASCog- 3.24/70
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Lecithin - major source of choline - RCT,double blind placebo controlled
study failed to show efficacy
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Huperzine A from chinese club moss Huperzia
serrata reversible AchE inhibitor RCT, double blinded Chinese study with 482 pts showed improvement in MMSE-2.8/30 & ADASCog -1.91/70 @ 6
wks
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Transcutaneous electrical nerve stimulation (TENS) - change neurotransmitters,help in neuro regeneration - 3 RCT in Netherland & Japan - duration,waveform,current amplitude, - data limilted ,shows little improvement
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STEM CELL THERAPY
South Florida university with Cryo- cell International
Mouse model study in 2009 Several infusions of stem cells from umblical
cord Myeloid protein reduced by 62% Cerebral amyloid angiopathy by 82% Hope to begin human trials by 2014.
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Neural growth factor (NGF) -Injecting into spinal cord - trials going to formulate oral
preperation - still on pipe line.
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DIETARY MEASURES
No special diet for AD
Axona (caprylidine) improves cognition
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PREVENTION OF AD
Omega 3 fatty acids - French study(2005) showed decrease in
risk of AD in elderly > 60 yr - 2 RCT double blinded studies are
ongoing Mediterranean diet Light to moderate alcohol -Finnish study showed no beneficial
effects
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Who are the AD Caregivers?
• Spouses – the largest group. Most are older with their own health problems.
• Daughters – the second largest group. Called the “sandwich generation,” many are married and raising children of their own. Children may need extra support if a parent’s attention is focused on caregiving.
• Grandchildren – may become major helpers.
• Daughters-in-law – the third largest group.
• Sons – often focus on the financial, legal, and business aspects of caregiving.
• Brothers and Sisters – many are older with their own health problems.
• Others-friends,relatives
Support for Caregivers
Slide 37
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Technology and Caregiving
The NIA is studying how computers can provide information and support to family caregivers through:
These features have become very popular among users because they reach many people at once, are private and convenient, and are available around the clock.
• computer-based bulletin boards• chat rooms• Q & A modules• medical advice forums
Support for Caregivers
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CONCLUSION
Most common dementing disease worldwide Pschyco-social,economic burden Current therapy is symptomatic and limited New clinical trials & treatment approaches on
pipeline Social support for caregivers & alzheimer
support societies .
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REFERENCES
Harrisons internal medicine – 18 th edition www.clinicaltrials.gov www.thecochranelibrary.com www.alzheimers.org www.alz.org www.nia.nih.gov
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THANK U….