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Vascular dementia

Vascular dementia is dementia caused by a series of strokes.[2][4] Restricted blood flow due to strokes reduces oxygen and glucose delivery to the brain, causing cell injury and neurological deficits in the affected region.[6] Subtypes of vascular dementia include subcortical vascular dementia, multi-infarct dementia, stroke-related dementia, and mixed dementia.[2][5]

Vascular dementia
Other namesDementia due to cerebrovascular disease;[1]
Vascular cognitive impairment[2]
Brain atrophy from vascular dementia
SpecialtyPsychiatry, neurology Edit this on Wikidata
SymptomsCognitive impairment, short-term memory loss[3]
ComplicationsHeart disease, loss of ability to care for self and interact, pneumonia[4]
CausesConditions that impair blood vessels in the brain and therefore interfere with oxygen delivery to the brain[3]
Risk factorsHigh blood pressure, high cholesterol, atrial fibrillation, diabetes[3]
Diagnostic methodLab test, neuroimaging test, neuropsychological testing[5]
Differential diagnosisAlzheimer’s disease[5]
TreatmentSymptomatic[3][4]
Frequency15-30% of dementia cases in the United States, Europe, and Asia[5][6]

Subcortical vascular dementia occurs from damage to small blood vessels in the brain. Multi-infarct dementia results from a series of small strokes affecting several brain regions. Stroke-related dementia involving successive small strokes causes a more gradual decline in cognition.[4] Dementia may occur when neurodegenerative and cerebrovascular pathologies are mixed, as in susceptible elderly people (75 years and older).[2][5] Cognitive decline can be traced back to occurrence of successive strokes.[4]

ICD-11 lists vascular dementia as dementia due to cerebrovascular disease.[1] DSM-5 lists vascular dementia as either major or mild vascular neurocognitive disorder.[7]

Signs and symptoms

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People with vascular dementia present with progressive cognitive impairment, acutely or sub-acutely as in mild cognitive impairment, frequently step-wise, after multiple strokes.[5]

The disease is described as both a mental and behavioral disorder within the ICD-11.[8] Signs and symptoms are cognitive, motor, behavioral, and for a significant proportion of people, also affective. These changes typically occur over a period of 5–10 years. Signs are typically the same as in other dementias, but mainly include cognitive decline and memory impairment of sufficient severity as to interfere with activities of daily living, sometimes with presence of focal neurological signs, and evidence of features consistent with cerebrovascular disease on brain imaging (CT or MRI).[4][5]

The neurological signs localizing to certain areas of the brain that can be observed are hemiparesis, bradykinesia, hyperreflexia, extensor plantar reflexes, ataxia, pseudobulbar palsy, as well as gait problems and swallowing difficulties. People have patchy deficits in terms of cognitive testing. They tend to have better free recall and fewer recall intrusions when compared with people having Alzheimer's disease.[9] In the more severely affected people, or those affected by infarcts in Wernicke's or Broca's areas, specific problems with speaking called dysarthria and aphasias may be present.[2][5]

In small vessel disease, the frontal lobes are often affected. Consequently, people with vascular dementia tend to perform worse than their Alzheimer's disease counterparts in frontal lobe tasks, such as verbal fluency, and may present with frontal lobe problems: apathy, abulia (lack of will or initiative), problems with attention, orientation, and urinary incontinence. They tend to exhibit more perseverative behavior. People with vascular dementia may also present with general slowing of processing ability, difficulty shifting sets, and impairment in abstract thinking. Apathy early in the disease is more suggestive of vascular dementia.[2][5]

Rare genetic disorders that cause vascular lesions in the brain have other presentation patterns. As a rule, they tend to occur earlier in life and have a more aggressive course. In addition, infectious disorders, such as syphilis, can cause arterial damage, strokes, and bacterial inflammation of the brain.[10]

Causes

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Risk factors and clinical characteristics for vascular dementia[11]

Vascular dementia can be caused by ischemic or hemorrhagic infarcts affecting multiple brain areas, including the anterior cerebral artery territory, the parietal lobes, or the cingulate gyrus.[5] On rare occasion, infarcts in the hippocampus or thalamus are the cause of dementia.[12] A history of stroke increases the risk of developing dementia by around 70%, and recent stroke increases the risk by around 120%.[13] Brain vascular lesions can also be the result of diffuse cerebrovascular disease, such as small vessel disease.[5]

Risk factors

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See also: Brain health and pollution § Cognitive decline and dementia

Risk factors for vascular dementia include increasing age, hypertension, smoking, hypercholesterolemia, diabetes mellitus, cardiovascular disease, and cerebrovascular disease.[2][5] Other risk factors include lifestyle, geographic origin, and APOE-ε4 genotype.[2][5]

Vascular dementia can sometimes be triggered by cerebral amyloid angiopathy, which involves accumulation of amyloid beta plaques in the walls of the cerebral arteries, leading to breakdown and rupture of the vessels.[2][5] Since amyloid plaques are a characteristic feature of Alzheimer's disease, vascular dementia may occur as a consequence.[2][6]

Diagnosis

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Several specific diagnostic criteria can be used to diagnose vascular dementia, including the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) criteria, the International Classification of Diseases, Tenth Edition (ICD-10) criteria, the National Institute of Neurological Disorders and Stroke criteria, Association Internationale pour la Recherche et l'Enseignement en Neurosciences (NINDS-AIREN) criteria, the Alzheimer's Disease Diagnostic and Treatment Center criteria, and the Hachinski Ischemic Score (after Vladimir Hachinski).[2][6][14]

The recommended investigations for cognitive impairment include: blood tests (for anemia, vitamin deficiency, thyrotoxicosis, infection, among others), chest xray, ECG, and neuroimaging, preferably a scan with a functional or metabolic sensitivity beyond a simple CT or MRI.[2][4] When available as a diagnostic tool, single photon emission computed tomography (SPECT) and positron emission tomography (PET) neuroimaging may be used to confirm a diagnosis of multi-infarct dementia in conjunction with evaluations involving mental status examination.[2][4][6]

In a person already having dementia, SPECT appears to be superior in differentiating multi-infarct dementia from Alzheimer's disease, compared to the usual mental testing and medical history analysis.[15][additional citation(s) needed]

The screening blood tests typically include full blood count, liver function tests, thyroid function tests, lipid profile, erythrocyte sedimentation rate, C reactive protein, syphilis serology, calcium serum level, fasting glucose, urea, electrolytes, vitamin B-12, and folate.[4][6]

Differential diagnosis

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Differentiating dementia syndromes can be challenging, due to the frequently overlapping clinical features and related underlying pathology. Mixed dementia, involving two types of dementia, can occur. In particular, Alzheimer's disease often co-occurs with vascular dementia.[2][5]

Mixed dementia is diagnosed when people have evidence of Alzheimer's disease and cerebrovascular disease, either clinically or based on neuro-imaging evidence of ischemic lesions.[16]

Pathology

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Gross examination of the brain may reveal noticeable lesions and damage to blood vessels.[2][6] Accumulation of various substances such as lipid deposits and clotted blood appear on microscopic views. The white matter is substantially affected, with noticeable atrophy (tissue loss), in addition to calcification of the arteries.[2][6][17] Microinfarcts may also be present in the gray matter (cerebral cortex), sometimes in large numbers.[2]

Although atheroma of the major cerebral arteries is typical in vascular dementia, smaller vessels and arterioles are mainly affected.[2][6]

Prevention

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Early detection and accurate diagnosis are important, as vascular dementia is at least partially preventable. Ischemic changes in the brain are irreversible, but the person with vascular dementia can demonstrate periods of stability or even mild improvement.[18] Since stroke is an essential part of vascular dementia,[13] the goal is to prevent new strokes. This is attempted through reduction of stroke risk factors, such as high blood pressure, high blood lipid levels, atrial fibrillation, or diabetes mellitus.[2][5]

Medications for high blood pressure are used to prevent pre-stroke dementia.[19] These medications include angiotensin converting enzyme inhibitors, diuretics, calcium channel blockers, sympathetic nerve inhibitors, angiotensin II receptor antagonists or adrenergic antagonists.[medical citation needed]

A 2023 review found that therapy with statin drugs was ineffective in treating or preventing stroke or dementia in people without a history of cerebrovascular disease.[20]

Treatment

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As of 2024, there are no medications used specifically for prevention or treatment of vascular dementia.[4][3]

Prognosis

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Many studies have been conducted to determine average survival of people with dementia. The studies were frequently small and limited, which caused contradictory results in the connection of mortality to the type of dementia and the person's gender. One 2015 study found that the one-year mortality was three to four times higher in people after their first referral to a day clinic for dementia, when compared to the general population.[21] If the person was hospitalized for dementia, the mortality was even higher than in people hospitalized for cardiovascular disease.[21] Vascular dementia was found to have either comparable or worse survival rates when compared to Alzheimer's disease;[22] another 2014 study found that the prognosis for people with vascular dementia was worse for male and older people.[23]

Vascular dementia may be a direct cause of death due to the possibility of a fatal interruption in the brain's blood supply.[24]

Epidemiology

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Vascular dementia is the second-most-common form of dementia after Alzheimer's disease in older adults.[4] The prevalence of the illness is 1.5% in Western countries and approximately 2.2% in Japan. It accounts for 50% of all dementias in Japan, 20% to 40% in Europe and 15% in Latin America. 25% of people with stroke develop new-onset dementia within one year of their stroke. One study found that in the United States, the prevalence of vascular dementia in all people over the age of 71 is 2.43%, and another found that the prevalence of the dementias doubles with every 5.1 years of age.[citation needed]

The incidence peaks between the fourth and the seventh decades of life and 80% of people have a history of hypertension.[25][additional citation(s) needed]

A 2018 meta-analysis identified 36 studies of prevalent stroke (1.9 million participants) and 12 studies of incident stroke (1.3 million participants).[13] For prevalent stroke, the pooled hazard ratio for all-cause dementia was 1.69; for incident stroke, the pooled risk ratio was 2.18.[13] Study characteristics did not modify these associations, with the exception of sex, which explained 50.2% of between-study heterogeneity for prevalent stroke. These results confirm that stroke is a strong, independent, and potentially modifiable risk factor for all-cause dementia.[13]

See also

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References

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  1. ^ a b "ICD-11: Dementia due to cerebrovascular disease". World Health Organization. 2024. Retrieved 10 April 2024.
  2. ^ a b c d e f g h i j k l m n o p q r s Iadecola C, Duering M, Hachinski V, Joutel A, Pendlebury ST, Schneider JA, et al. (July 2019). "Vascular Cognitive Impairment and Dementia". Journal of the American College of Cardiology. 73 (25): 3326–3344. doi:10.1016/j.jacc.2019.04.034. PMC 6719789. PMID 31248555.
  3. ^ a b c d e "Vascular dementia". National Heart, Lung, and Blood Institute, US National Institutes of Health. 28 September 2022. Retrieved 10 April 2024.
  4. ^ a b c d e f g h i j k "Vascular dementia". MedlinePlus, US National Library of Medicine.
  5. ^ a b c d e f g h i j k l m n o p Sanders AE, Schoo C, Kalish VB (22 October 2023). "Vascular dementia". StatPearls, US National Library of Medicine. PMID 28613567. Retrieved 9 April 2024.
  6. ^ a b c d e f g h i Wong CE, Chui CH (June 2022). "Vascular cognitive impairment and dementia". Continuum. 28 (3): 750–780. doi:10.1212/CON.0000000000001124. PMC 9833847. PMID 35678401.
  7. ^ American Psychiatric Association (2013). Diagnostic and statistical manual of mental disorders : DSM-5 (5th ed.). Washington, DC: American Psychiatric Association. pp. 591–603. ISBN 978-0-89042-554-1.
  8. ^ "ICD-11 for Mortality and Morbidity Statistics". icd.who.int. Retrieved 2022-12-09.
  9. ^ Alagiakrishnan K. "Vascular Dementia Clinical Presentation: History, Physical, Causes". emedicine.medscape.com. Retrieved 2021-03-19.
  10. ^ Cannistraro RJ, Badi M, Eidelman BH, Dickson DW, Middlebrooks EH, Meschia JF (2019-06-11). "CNS small vessel disease: A clinical review". Neurology. 92 (24): 1146–1156. doi:10.1212/WNL.0000000000007654. ISSN 1526-632X. PMC 6598791. PMID 31142635.
  11. ^ Mossanen Parsi M, Duval C, Ariëns R (2021). "Vascular dementia and crosstalk between the complement and coagulation systems". Frontiers in Cardiovascular Medicine. 8: 803169. doi:10.3389/fcvm.2021.803169. PMC 8733168. PMID 35004913.
  12. ^ Kaur M, Sharma S (1 February 2022). "Molecular mechanisms of cognitive impairment associated with stroke". Metabolic Brain Disease. 37 (2): 279–287. doi:10.1007/s11011-022-00901-0. ISSN 1573-7365. PMID 35029798.
  13. ^ a b c d e Kuźma E, Lourida I, Moore SF, Levine DA, Ukoumunne OC, Llewellyn DJ (November 2018). "Stroke and dementia risk: A systematic review and meta-analysis". Alzheimer's & Dementia. 14 (11): 1416–1426. doi:10.1016/j.jalz.2018.06.3061. PMC 6231970. PMID 30177276.
  14. ^ Robinson L, Tang E, Taylor JP (16 June 2015). "Dementia: timely diagnosis and early intervention". BMJ. 350: h3029. doi:10.1136/bmj.h3029. ISSN 1756-1833. PMC 4468575. PMID 26079686.
  15. ^ Engelhardt E, Tocquer C, André C, Moreira DM, Okamoto IH, Cavalcanti J, et al. (October 2011). "Vascular dementia: Diagnostic criteria and supplementary exams. Recommendations of the Scientific Department of Cognitive Neurology and Aging of the Brazilian Academy of Neurology. Part I." Dementia & Neuropsychologia. 5 (4): 251–263. doi:10.1590/S1980-57642011DN05040003. PMC 5619038. PMID 29213752.
  16. ^ Custodio N, Montesinos R, Lira D, Herrera-Pérez E, Bardales Y, Valeriano-Lorenzo L (2017). "Mixed dementia: A review of the evidence". Dementia & Neuropsychologia. 11 (4): 364–370. doi:10.1590/1980-57642016dn11-040005. ISSN 1980-5764. PMC 5769994. PMID 29354216.
  17. ^ Hase Y, Horsburgh K, Ihara M, Kalaria RN (2018). "White matter degeneration in vascular and other ageing-related dementias". Journal of Neurochemistry. 144 (5): 617–633. doi:10.1111/jnc.14271. hdl:20.500.11820/780992bd-e933-4715-8099-c4d463070a58. PMID 29210074. S2CID 33778577.
  18. ^ Erkinjuntti T (February 2012). Gelder M, Andreasen N, Lopez-Ibor J, Geddes J (eds.). New Oxford Textbook of Psychiatry (2 ed.). Oxford: Oxford University Press. doi:10.1093/med/9780199696758.001.0001. ISBN 978-0-19-969675-8. Retrieved 2015-09-07.
  19. ^ Santisteban MM, Iadecola C, Carnevale D (January 2023). "Hypertension, neurovascular dysfunction, and cognitive impairment". Hypertension. 80 (1): 22–34. doi:10.1161/HYPERTENSIONAHA.122.18085. PMC 9742151. PMID 36129176.
  20. ^ Goldstein LB, Toth PP, Dearborn-Tomazos JL, Giugliano RP, Hirsh BJ, Peña JM, et al. (October 2023). "Aggressive LDL-C Lowering and the Brain: Impact on Risk for Dementia and Hemorrhagic Stroke: A Scientific Statement From the American Heart Association". Arteriosclerosis, Thrombosis, and Vascular Biology. 43 (10): e404–e442. doi:10.1161/ATV.0000000000000164. PMID 37706297.
  21. ^ a b van de Vorst IE, Vaartjes I, Geerlings MI, Bots ML, Koek HL (October 2015). "Prognosis of patients with dementia: results from a prospective nationwide registry linkage study in the Netherlands". BMJ Open. 5 (10): e008897. doi:10.1136/bmjopen-2015-008897. PMC 4636675. PMID 26510729.  
  22. ^ Villarejo A, Benito-León J, Trincado R, Posada IJ, Puertas-Martín V, Boix R, et al. (2011). "Dementia-associated mortality at thirteen years in the NEDICES Cohort Study". Journal of Alzheimer's Disease. 26 (3): 543–51. doi:10.3233/JAD-2011-110443. PMID 21694455.
  23. ^ Garcia-Ptacek S, Farahmand B, Kåreholt I, Religa D, Cuadrado ML, Eriksdotter M (2014). "Mortality risk after dementia diagnosis by dementia type and underlying factors: a cohort of 15,209 patients based on the Swedish Dementia Registry". Journal of Alzheimer's Disease. 41 (2): 467–77. doi:10.3233/JAD-131856. PMID 24625796.
  24. ^ Fletcher, A (June 2023). "Good Practice Series No 11- MEs and Dementia". The Royal College of Pathologists. p. 8. Retrieved March 19, 2024.
  25. ^ Wolters FJ, Ikram MA (2019). "Epidemiology of Vascular Dementia". Arteriosclerosis, Thrombosis, and Vascular Biology. 39 (8). Arterioscler Thromb Vasc Biol: 1542–1549. doi:10.1161/ATVBAHA.119.311908. PMID 31294622.
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