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Dementia

Dementia

Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
The progression of dementia is generally gradual.

Dementia l: Introduction

Dementia l: Introduction

Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...

Alzheimer Disease l: Introduction

Alzheimer Disease l: Introduction

Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...

Alzheimer's Disease: Overview

Alzheimer's Disease: Overview

Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ and tau...

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Alzheimer's Disease: Treatment

Alzheimer's Disease (AD), a neurodegenerative disorder, is pathologically identified by amyloid plaques and neurofibrillary tangles composed of tau protein. AD pharmacotherapy aims to manage cognitive symptoms, delay disease progression, and treat behavioral symptoms. The treatment is primarily symptomatic and palliative, with no definitive disease-modifying therapy available. Cholinesterase inhibitors, including donepezil (Aricept), rivastigmine (Exelon), and galantamine (Razadyne), are...

Alzheimer Disease ll: Pathophysiology

Alzheimer Disease ll: Pathophysiology

Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...

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Related Experiment Video

Updated: May 31, 2026

The 4 Mountains Test: A Short Test of Spatial Memory with High Sensitivity for the Diagnosis of Pre-dementia Alzheimer's Disease

The 4 Mountains Test: A Short Test of Spatial Memory with High Sensitivity for the Diagnosis of Pre-dementia Alzheimer's Disease

Published on: October 13, 2016

Diagnosing dementia: no easy job.

Frank Buntinx¹, Jan De Lepeleire, Louis Paquay

¹Katholieke Universiteit Leuven, Department of General Practice, Kapucijnenvoer 33, blok J, B 3000 Leuven, Belgium. Frank.buntinx@med.kuleuven.be

BMC Family Practice

|June 29, 2011

Summary

This study outlines a four-step diagnostic process for dementia, starting with initial recognition by a general practitioner (GP) and progressing through disease and care-oriented assessments, followed by monitoring. This framework aids in dementia diagnosis and care planning.

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Last Updated: May 31, 2026

The 4 Mountains Test: A Short Test of Spatial Memory with High Sensitivity for the Diagnosis of Pre-dementia Alzheimer's Disease

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Published on: October 13, 2016

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Area of Science:

Gerontology
Neurology
Primary Care Medicine

Background:

Complex progressive disorders like dementia require multi-step diagnostic approaches.
Each stage of dementia diagnosis presents unique clinical and research characteristics.

Purpose of the Study:

To propose a structured, phased approach to dementia diagnosis.
To guide the design of future research in dementia screening, diagnosis, and monitoring.

Main Methods:

The study defines a diagnostic pathway based on clinical experience and research findings.
It emphasizes a phased approach to dementia diagnosis and care.

Main Results:

The proposed diagnostic process includes a trigger phase, disease-oriented diagnosis, and care-oriented diagnosis.
Consideration of caregiver impact and the patient-caregiver interaction is integral.
A monitoring phase follows the comprehensive diagnosis and care plan.

Conclusions:

The diagnostic process for dementia can be divided into four distinct steps followed by a monitoring phase.
This structured approach is recommended for studies focusing on dementia screening, diagnosis, and monitoring.
Integrating caregiver considerations is crucial throughout the dementia diagnostic journey.