Dementia: Difference between revisions

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== Description/Definition ==
== Definition ==
Dementia refers to a group of symptoms associated with a decline in mental ability. It is caused by disorders affecting the brain, and are described by a collection of symptoms affecting the brain. Dementia has an effect on thinking, behaviour and social interaction, as well as functional abilities<ref name=":3">Robinson L, Tang E, Taylor J. [https://www.bmj.com/content/bmj/350/bmj.h3029.full.pdf Clinical review. Dementia: timely diagnosis and early intervention]. BMJ. 2015;350:h3029. Accessed 26 November 2018.</ref>.
Dementia refers to a group of symptoms associated with a decline in mental ability. It is caused by disorders affecting the brain, and are described by a collection of symptoms affecting the brain. Dementia has an effect on thinking, behaviour and social interaction, as well as functional abilities<ref name=":3">Robinson L, Tang E, Taylor J. [https://www.bmj.com/content/bmj/350/bmj.h3029.full.pdf Clinical review. Dementia: timely diagnosis and early intervention]. BMJ. 2015;350:h3029. Accessed 26 November 2018.</ref>.


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== Clinically Relevant Anatomy ==
== Clinically Relevant Anatomy ==
'''Hippocampus'''
Symptoms of dementia depend on the area of the brain affected by the underlying pathology e.g. vascular disease affecting particular vessels supplying a particular lobe of the brain. The [https://www.physio-pedia.com/Introduction_to_Neuroanatomy#Limbic_System hippocampus] though is often involved and contributes to the well-known symptoms of memory loss.
 
=== '''Hippocampus''' ===
* Centre of memory and learning
* Centre of memory and learning
* Cells in this region are normally first to be damaged, resulting in the most common symptom of memory loss  
* Cells in this region are normally first to be damaged in [[Alzheimer's Disease|Alzheimer's disease]]<ref>Maruszak A, Thuret S. [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3978283/ Why looking at the whole hippocampus is not enough—a critical role for anteroposterior axis, subfield and activation analyses to enhance predictive value of hippocampal changes for Alzheimer’s disease diagnosis.] Front Cell Neurosci. 2014; 8: 95. Accessed 27 November 2018.</ref>, resulting in the most common symptom of memory loss  
* Changes in hippocampal volume (a reduction) are seen with common patterns of ageing but are exacerbated in Alzheimers<ref>den Heijer T, van der Lign F, Koudstaal PJ, Hofman A, van der Lugt A, Krestin GP, Niessen WJ, Breteler MMB. [https://academic.oup.com/brain/article/133/4/1163/312623 A 10-year follow-up of hippocampal volume on magnetic resonance imaging in early dementia and cognitive decline]. Brain. 2010. 133; 4: 1163–1172. Accessed 26 November 2018.
* Changes in hippocampal volume (a reduction) are seen with common patterns of ageing but are exacerbated in Alzheimers<ref>den Heijer T, van der Lign F, Koudstaal PJ, Hofman A, van der Lugt A, Krestin GP, Niessen WJ, Breteler MMB. [https://academic.oup.com/brain/article/133/4/1163/312623 A 10-year follow-up of hippocampal volume on magnetic resonance imaging in early dementia and cognitive decline]. Brain. 2010. 133; 4: 1163–1172. Accessed 26 November 2018.
</ref>  
</ref>  
== Epidemiology & Etiology ==
== Epidemiology and Etiology ==


=== Epidemiology ===
=== Epidemiology ===
Dementia is more common in the population above 65<ref name=":0">Dementia Australia. What is dementia? https://www.dementia.org.au/about-dementia/what-is-dementia (accessed 26/09/2018).</ref>.
Dementia affects approximately 47 million people worldwide and is projected to increase to 75 million in 2030 and 132 million by 2050<ref name=":4">World Health Organisation. [http://apps.who.int/iris/bitstream/handle/10665/259615/9789241513487-eng.pdf?sequence=1 Global action plan on the public health response to dementia 2017–2025]. 2017. Accessed 27 November 2018.</ref>.  Dementia is generally associated with age but early onset dementia also occurs.


=== Etiology ===
=== Etiology ===
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Different types of dementia has different causes. Common types of dementia are:
Different types of dementia has different causes. Common types of dementia are:
* [[Alzheimer's Disease|Alzheimer's disease]] (most common type<ref name=":3" />):
* [[Alzheimer's Disease|Alzheimer's disease]] (most common type<ref name=":3" /><ref name=":4" />):
** 60-80% of cases
** 60-70% of cases
{{#ev:youtube|v5gdH_Hydes}}
{{#ev:youtube|v5gdH_Hydes}}
* Vascular dementia (second most common type<ref name=":3" />):
* Vascular dementia (second most common type<ref name=":3" />):
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* Creutzfeldt-Jacob disease
* Creutzfeldt-Jacob disease
{{#ev:youtube|lS9jKVM7ZXo}}
{{#ev:youtube|lS9jKVM7ZXo}}
=== Risk Factors ===
Age is the primary risk factor for dementia<ref name=":4" />. While genetics can also increase risk<ref>Loy CT, Schofield PR, Turner AM, Kwok JB. [https://ses.library.usyd.edu.au/bitstream/2123/11508/2/Loy13LancetFinalDraft.pdf Genetics of dementia]. Lancet. 2014. 383; 9919:828-40. Accessed 27 November 2018.
</ref> there are noncommunicable, and often modifiable, diseases that increase the risk of dementia. These include: physical inactivity, [[Obesity: A Clinical Approach|obesity]], unbalanced diets, tobacco use, harmful [[Alcoholism|alcohol]] intake, [[Diabetes Mellitus Type 2|diabetes mellitus]] and mid-life hypertension<ref name=":4" />.


== Clinical Presentation ==
== Clinical Presentation ==
Early signs of dementia are normally subtle, sometimes mimicking other patterns of ageing<ref name=":3" />. It can include<ref name=":1">Alzheimer's association. What is dementia? https://www.alz.org/alzheimers-dementia/what-is-dementia (accessed 26/09/2018).</ref><ref name=":0" />:
Early signs of dementia are normally subtle, sometimes mimicking other patterns of ageing<ref name=":3" />. It can include<ref name=":1">Alzheimer's association. What is dementia? https://www.alz.org/alzheimers-dementia/what-is-dementia (accessed 26/09/2018).</ref><ref name=":0">Dementia Australia. What is dementia? https://www.dementia.org.au/about-dementia/what-is-dementia (accessed 26/09/2018).</ref>:
* Progressive and frequent memory loss (mostly short-term)
* Progressive and frequent memory loss (mostly short-term)
* Confusion
* Confusion
* Personality change
* Personality changes
* Apathy and withdrawal
* Apathy and withdrawal
* Loss of functional abilities to perform activities of daily living
* Loss of functional abilities to perform activities of daily living
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== Diagnostic Procedures ==
== Diagnostic Procedures ==
There are no clear test to diagnose dementia. To make the diagnosis of dementia, at least two of the core mental functions need to be significantly impaired<ref name=":1" />:
General practitioners are usually the first port of call for diagnosis of dementia<ref name=":3" />. Making a diagnosis can be challenging. The [https://www.nice.org.uk/guidance/ng97/resources/dementia-assessment-management-and-support-for-people-living-with-dementia-and-their-carers-pdf-1837760199109 NICE guidelines for dementia] recommend the following process for making a diagnosis.
* Memory
* Take a history including cognitive, behavioural and psychological symptoms, and their impact on daily life. A history should be taken from the individual with  dementia symptoms ideally also
* Communication and language skills
* A physical examination with blood and urine tests to exclude reversible causes of cognitive decline
* Concentration and focus
* Cognitive testing using a validated brief structured cognitive instrument such as: the 10-point cognitive screener (10-CS) the 6-item cognitive impairment test (6CIT) the 6-item screener the Memory Impairment Screen (MIS) the Mini-Cog Test Your Memory (TYM).
* Reasoning and judgment
Diagnosis of the dementia subtype is critical for clinical management and anticipating the course of disease<ref name=":3" />. Certain types of dementia are diagnosed by medical history, physical examination, blood tests, and characteristic changes in thinking, behaviour and the effect on performance of activities of daily living. The diagnosis of the dementia subtype can be difficult to diagnose as many of the symptoms and brain changes overlap. Secondary care services normally assist in the diagnosis of the specific types of dementia<ref name=":3" />.
* Visual perception
 
Diagnosis of the dementia subtype is critical for clinical management and anticipating the course of disease<ref name=":3" />. Certain types of dementia are diagnosed by medical history, physical examination, blood tests, and characteristic changes in thinking, behaviour and the effect on performance of activities of daily living. The diagnosis of the dementia subtype can be difficult to diagnose as many of the symptoms and brain changes overlap. Neurologists or geropsychologist normally assist in the diagnosis of the specific types of dementia<ref name=":1" />.


== Differential Diagnosis ==
== Differential Diagnosis ==

Revision as of 02:51, 27 November 2018

Original Editors - Leana Louw

Top Contributors - Vidya Acharya, Lucinda hampton, Kim Jackson, Leana Louw, Lauren Lopez, Simisola Ajeyalemi, Aminat Abolade, Tony Lowe, Shaimaa Eldib, Naomi O'Reilly, Kalyani Yajnanarayan, Safiya Naz, Ewa Jaraczewska, Carina Therese Magtibay and Aya Alhindi  

Definition[edit | edit source]

Dementia refers to a group of symptoms associated with a decline in mental ability. It is caused by disorders affecting the brain, and are described by a collection of symptoms affecting the brain. Dementia has an effect on thinking, behaviour and social interaction, as well as functional abilities[1].

Clinically Relevant Anatomy[edit | edit source]

Symptoms of dementia depend on the area of the brain affected by the underlying pathology e.g. vascular disease affecting particular vessels supplying a particular lobe of the brain. The hippocampus though is often involved and contributes to the well-known symptoms of memory loss.

Hippocampus[edit | edit source]

  • Centre of memory and learning
  • Cells in this region are normally first to be damaged in Alzheimer's disease[2], resulting in the most common symptom of memory loss
  • Changes in hippocampal volume (a reduction) are seen with common patterns of ageing but are exacerbated in Alzheimers[3]

Epidemiology and Etiology[edit | edit source]

Epidemiology[edit | edit source]

Dementia affects approximately 47 million people worldwide and is projected to increase to 75 million in 2030 and 132 million by 2050[4]. Dementia is generally associated with age but early onset dementia also occurs.

Etiology[edit | edit source]

Damage to brain cells causes changes to cognitive, behavioural and emotional functions, causing dementia.

Different types of dementia has different causes. Common types of dementia are:

  • Fronto-temporal lobar degeneration dementia
  • Alcohol related dementia (Korsakoff's syndrome)
  • Creutzfeldt-Jacob disease

Risk Factors[edit | edit source]

Age is the primary risk factor for dementia[4]. While genetics can also increase risk[5] there are noncommunicable, and often modifiable, diseases that increase the risk of dementia. These include: physical inactivity, obesity, unbalanced diets, tobacco use, harmful alcohol intake, diabetes mellitus and mid-life hypertension[4].

Clinical Presentation[edit | edit source]

Early signs of dementia are normally subtle, sometimes mimicking other patterns of ageing[1]. It can include[6][7]:

  • Progressive and frequent memory loss (mostly short-term)
  • Confusion
  • Personality changes
  • Apathy and withdrawal
  • Loss of functional abilities to perform activities of daily living

Although some cases of dementia are reversible (e.g. hormonal or vitamin deficiencies), most are progressive, with a slow, gradual onset. Certain symptoms, mostly behavioural and psychological, can result from drug interactions, environmental factors, unreported pain and other illnesses[7].

Diagnostic Procedures[edit | edit source]

General practitioners are usually the first port of call for diagnosis of dementia[1]. Making a diagnosis can be challenging. The NICE guidelines for dementia recommend the following process for making a diagnosis.

  • Take a history including cognitive, behavioural and psychological symptoms, and their impact on daily life. A history should be taken from the individual with dementia symptoms ideally also
  • A physical examination with blood and urine tests to exclude reversible causes of cognitive decline
  • Cognitive testing using a validated brief structured cognitive instrument such as: the 10-point cognitive screener (10-CS) the 6-item cognitive impairment test (6CIT) the 6-item screener the Memory Impairment Screen (MIS) the Mini-Cog Test Your Memory (TYM).

Diagnosis of the dementia subtype is critical for clinical management and anticipating the course of disease[1]. Certain types of dementia are diagnosed by medical history, physical examination, blood tests, and characteristic changes in thinking, behaviour and the effect on performance of activities of daily living. The diagnosis of the dementia subtype can be difficult to diagnose as many of the symptoms and brain changes overlap. Secondary care services normally assist in the diagnosis of the specific types of dementia[1].

Differential Diagnosis[edit | edit source]

Dementia can have different causes, and the following conditions need to be treated and/or excluded:

  • Vitamin B12 deficiency[1]
  • Hormone deficiencies (e.g. thyroid problems)[1]
  • Depression[1]
  • Medication side-effects
  • Alcohol abuse
  • Overmedication
  • Infections
  • Brain tumours

Outcome Measures[edit | edit source]

The following list is from a review of useful outcome measures for dementia.

Medical Management[edit | edit source]

Medical management should be obtained as soon as symptoms start appearing, as some of the causes are treatable, and early diagnosis and management can slow down or treat the disease process to allow most benefit from available treatments[6].

Medication [7][edit | edit source]

Antidepressants[edit | edit source]

Effectiveness is normally only seen after 2-3 weeks.

  • Types:
    • Tricyclic (amitriptyline, imipramine or dothiepin)
      • Side-effects:
        • Worsening confusion
        • Dry mouth
        • Blurry vision
        • Constipation
        • Dizziness in upright position (thus not recommended in Alzheimer's disease, as it can cause falls and injuries)
        • Difficulty with urination
    • Newer types of antidepressants have less side-effects
      • First line treatment: Fluoxetine, paroxetine, fluvoxamine, sertraline, citalopram and escitalopram
      • Side-effect
        • Headaches
        • Nausea
  • Commonly prescribed:
    • Antidepressants:
      • Amitriptyline (Endep) 
      • Citalopram (Cipramil, also Celapram, Ciazil, Talam, Talohexal) 
      • Dothiepin (Prothiaden, also Dothep) 
      • Doxepin (Sinequan, also Deptran)
      • Escitalopram (Lexapro) 
      • Fluoxetine (Prozac, also Lovan, Auscap, Fluohexal, Fluoxebell, Zactin) 
      • Fluvoxamine (Faverin, also Movax, Luvox, Voxam) 
      • Imipramine (Tofranil, also Tolerade) 
      • Mirtazipine (Avanza, Axit, Mirtazon, Remeron) 
      • Nortriptyline (Allegron) 
      • Paroxetine (Aropax, Paxtine, Oxetine) 
      • Reboxetine (Edronax) 
      • Sertraline (Zoloft, Xydep, Eleva, Concorz) 
      • Venlafaxine (Efexor)
      • Lithium carbonate (Lithicarb, Quilonum) - mood stabilizer

Antipsychotics[edit | edit source]

  • Neuroleptics/major tranquillisers such as:
    • Amisulpride (Solian) 
    • Chlorpromazine (Largactil)  
    • Fluphenazine (Modecate) 
    • Haloperidol (Haldol, Serenace) 
    • Moclobemide (Auroix) 
    • Olanzapine (Zyprexa) 
    • Promazine (Promazine) 
    • Quetiapine (Seroquel) 
    • Risperidone (Risperdal) 
    • Sulpiride (Dolmatil, Sulparex, Sulpitil) 
    • Trifluoperazine (Stelazine) 
    • Zuclopenthixol (Clopixol)
  • Treat agitation, aggression and psychotic symptoms
  • Side-effects:
    • Sedation
    • Dizziness
    • Unsteadiness
    • Shakiness, slowlessness, stiffness of limbs (resembles Parkinson's disease)

Hypnotics[edit | edit source]

  • Treatment of sleep disturbances
  • Side-effects:
    • Excessive sedation
    • Increased confusion
    • Unsteadiness
    • Long-term use: Tardive dyskinesia
  • Commonly prescribed:
    • Chloral hydrate (Welldorm) 
    • Clomethiazole (Heminevrin) 
    • Flurazepam (Dalmane) 
    • Nitrazepam (Mogadon also Alodorm) 
    • Temazepam (Femaze, Temtabs, Normison) 
    • Zopiclone (Imrest, Imovane) 
    • Zolpidem (Stilnoct)

Anxiety-relieving drugs[edit | edit source]

  • Benzodiazepine - short periods of anxiety
    • Short duration: Lorazepam, oxazepam
    • Long duration: Chlordiazepoxide, diazepam
  • Long term use not recommended
  • Side-effects:
    • Excessive sedation
    • Unsteadiness
    • Accentuation of confusion and memory deficits
  • Commonly prescribed:
    • Alprazolam (Xanax, also Alprax, Kalma, Zamahexal) 
    • Buspirone (Buspar) 
    • Diazepam (Valium also Antenex, Valpam, Ducene) 
    • Lorazepam (Ativan) 
    • Oxazepam (Alepam, Serepax, Minelax)

Anticonvulsants[edit | edit source]

  • Commonly prescribed:
    • Sodium valproate (Epilim also Valpro) 
    • Carbamazepine (Tegretol)
  • Reduce aggression and agitation

Cholinesterase inhibitors[edit | edit source]

  • Donepezil, galantamine, rivastigmine
  • Effects:
    • Improve memory and ability to perform activities of daily living (especially in Alzheimer's disease)
    • Slight effect on behavioural symptoms, mood, confidence, delusions, hallucinations
  • Side-effects (high dosages):
    • Increased agitation
    • Insomnia with nightmares

Lifestyle Modifications[edit | edit source]

  • Regular exercise/active lifestyle:
    • Very effective in the management of the depression component of dementia
  • Stimulating daily activities

[7]

Physiotherapy Management[edit | edit source]

Physiotherapy is not a modality used to treat dementia, but a well rounded knowledge about the condition is very important in the management of patients presenting to physiotherapy for other conditions, with the co-morbidity of dementia. Therapeutic non-drug treatment may include cognitive stimulation therapy[8] which has been shown to be as clinically effective and cost effective as acetylcholinesterase inhibitors[9]. Cognitive stimulation therapy can be administrated by anyone working with dementia patients; carers, nurses or occupational therapists[10].

Exercise Therapy[edit | edit source]

Physiotherapists can play a role in customising exercise programmes. Research have shown positive effects that exercise can prevent or delay the onset of dementia, by slowing down the cognitive decline[11][12]. This can lead to improved quality of life and slowing down of functional decline expected with the disease process[12].

Resources [edit | edit source]

References[edit | edit source]

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Robinson L, Tang E, Taylor J. Clinical review. Dementia: timely diagnosis and early intervention. BMJ. 2015;350:h3029. Accessed 26 November 2018.
  2. ↑ Maruszak A, Thuret S. Why looking at the whole hippocampus is not enough—a critical role for anteroposterior axis, subfield and activation analyses to enhance predictive value of hippocampal changes for Alzheimer’s disease diagnosis. Front Cell Neurosci. 2014; 8: 95. Accessed 27 November 2018.
  3. ↑ den Heijer T, van der Lign F, Koudstaal PJ, Hofman A, van der Lugt A, Krestin GP, Niessen WJ, Breteler MMB. A 10-year follow-up of hippocampal volume on magnetic resonance imaging in early dementia and cognitive decline. Brain. 2010. 133; 4: 1163–1172. Accessed 26 November 2018.
  4. ↑ 4.0 4.1 4.2 4.3 World Health Organisation. Global action plan on the public health response to dementia 2017–2025. 2017. Accessed 27 November 2018.
  5. ↑ Loy CT, Schofield PR, Turner AM, Kwok JB. Genetics of dementia. Lancet. 2014. 383; 9919:828-40. Accessed 27 November 2018.
  6. ↑ 6.0 6.1 Alzheimer's association. What is dementia? https://www.alz.org/alzheimers-dementia/what-is-dementia (accessed 26/09/2018).
  7. ↑ 7.0 7.1 7.2 7.3 Dementia Australia. What is dementia? https://www.dementia.org.au/about-dementia/what-is-dementia (accessed 26/09/2018).
  8. ↑ Km K, Han JW, So Y, Seo J, Kim YJ, Park JH, Lee SB, Lee JJ, Jeong H, Lim TH, Kim KW. Cognitive Stimulation as a Therapeutic Modality for Dementia: A Meta-Analysis. Psychiatry Investig. 2017. 14; 5: 626–639. Accessed 26 November 2018.
  9. ↑ Knapp M, Iemmi V, Romeo R. Dementia care costs and outcomes: a systematic review. Int J Geriatr Psychiatry 2013;28:551-61. Accessed 26 Novmeber 2018.
  10. ↑ Streater A, Aguirre E, Spector A, Orrell M. Cognitive stimulation therapy for people with dementia in practice: A service evaluation. Br Jour Occup Ther. 2016. 79; 9: 574–580. 
  11. ↑ Ko MH. Exercise for Dementia. Brain & Neurorehabilitation 2015;8(1):24-8.
  12. ↑ 12.0 12.1 Rolland Y. Exercise and Dementia. Pathy's Principles and Practice of Geriatric Medicine 2012;1:911-21.
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