Progressive Memory Loss and Alzheimer's Disease, Features and Stages

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Progressive Memory Loss and Alzheimer's Disease, Features and Stages

Abnormal Psychology · Chapter 20: Cognitive Impairments: Disorders of Thinking and MemorySection 20.3 · lesson 77 of 9718 min · free with a free account

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In this lesson

One syndrome, several diseases - and a person throughout.

  • Describe Alzheimer's disease - presentation, pathology, and stages
  • State the status of the amyloid account and of genetic risk accurately
  • Distinguish vascular, Lewy body, and frontotemporal presentations
  • Describe diagnosis, communication, and personhood-centered management

Transcript

Everything said in the video, section by section (2,359 words). Read along, or search it.

Cognitive Impairments: Disorders of Thinking and Memory

Alzheimer's Disease and Progressive Decline

This section covers progressive memory loss, and Alzheimer's disease in particular. Its features, and its stages. We look at how one syndrome can come from several diseases, at the pathology of Alzheimer's, and at the honest status of the amyloid account and of genetic risk. We distinguish vascular, Lewy body, and frontotemporal presentations, and finish with diagnosis, how to communicate it, and care that keeps the person at the center.

Before You Begin

People, Not Losses

This material is educational, and not a basis for diagnosing yourself or anyone else. Some viewers will have personal experience of these conditions, in themselves or someone they love. If you are concerned about yourself or someone close to you, please speak with a qualified professional. Two statements belong at the outset. People living with dementia retain preferences, emotions, relationships, and identity. Framing these conditions as a loss of personhood is inaccurate, and harmful. And the words sufferer, victim, demented, and senile are not used here. The first two define a person by a condition and cast them as passive. The last two reduce the person, or blame age itself.

Syndrome Versus Disease, Applied

The Same Syndrome, Different Diseases

Progressive neurocognitive disorders share one defining feature. Gradual decline from a previously attained level, continuing over months and years. What they do not share is a cause. Two people can meet the same syndrome, while one has Alzheimer's disease and the other a frontotemporal condition. The syndrome tells you there is significant acquired decline. The disease tells you what to expect, what to offer, and what to say. Prognosis differs. Management differs, most consequentially in Lewy body disease, where a medication sensitivity makes misattribution dangerous. And what families need to prepare for differs. The classification records attribution as probable, with stronger evidence, or possible, where support is weaker. That honestly records the strength of the judgment. Definitive attribution historically required post-mortem examination. Biomarker methods are beginning to detect aspects of the pathology during life, and their status is emerging and contested.

Alzheimer's Disease

Episodic Memory Fails First

Alzheimer's disease is the most common cause of progressive neurocognitive decline. It typically begins with episodic memory, the system for events tied to a time and place. So the early picture shows repeated questions, difficulty retaining recent conversations, and reliance on notes, while vocabulary, general knowledge, long-established skills, and personality remain intact. Families often describe the person as still themselves in this period, and they are right. As the disease progresses, other domains become involved. Language, with word-finding difficulty. Executive function, affecting complex tasks. And perceptual-motor function, affecting navigation. Social cognition and personality are typically affected later, which contrasts sharply with frontotemporal presentations, and is one of the more useful early discriminators.

The Pathology

Plaques, Tangles, and a Regional Pattern

Two protein abnormalities characterize the disease. Amyloid plaques are deposits that accumulate outside cells, between neurons. Tau tangles are accumulations inside cells, disrupting the structures that maintain the neuron and transport material along it. Both come with loss of neurons, and of the connections between them. The regional pattern explains the clinical one. Changes typically appear first in medial temporal structures, the regions needed to form new memories, before spreading more widely. So episodic memory goes first. But pathology and symptoms correlate imperfectly. Some people have substantial pathology at post-mortem, with no symptoms during life.

The Amyloid Account

Dominant - Not Established

The amyloid account proposes that amyloid accumulation is the initiating event, with tau changes, neuronal loss, and symptoms following. Its status needs careful statement. It remains the dominant framework. It has organized the field for decades, and is supported by the rare inherited forms, which involve genes affecting amyloid processing. But the trial history has been largely disappointing. A long sequence of treatments targeting amyloid has not produced the predicted clinical benefit. Where effects on pathology were shown, clinical benefit has been limited and contested. Alternative and complementary accounts are actively pursued, centered on tau, on inflammatory and immune processes, and on vascular and metabolic factors. And causation remains unsettled. No causal account of this disease is established. As with psychosis, a dominant framework that organized productive research is not thereby an established cause. That gap is where overstatement occurs.

Figure 20.3.2

Approximate Stages Against Independence

Here is a schematic of the approximate stages, set against functional independence. Independence is maintained through the preclinical stage and mild cognitive impairment, then declines through mild, moderate, and severe dementia. Look at the dashed band around the line, rather than the line itself. The band is the honest part of the figure. Progression rates differ greatly between people, and the stages overlap. Staging is a way to describe where someone is now, not a schedule they will follow.

The Stages

A Communication Tool, Not a Prediction

The stages, briefly. In the preclinical stage, pathological changes are present without symptoms. It is identifiable only by research methods, which is one reason the biomarker question is ethically complicated. Mild cognitive impairment is measurable decline that does not interfere with independence. In mild dementia, complex activities are affected. Finances, appointments, medication, and unfamiliar journeys. Personal care is typically managed. In moderate dementia, help is needed with everyday activities, including aspects of personal care, and supervision becomes necessary. In severe dementia, the person depends on others for most care, and communication and physical health are substantially affected. Progression is variable. Some people remain in one stage for years, while others move quickly, and it is not predictable at diagnosis. Staging helps communication and planning. It is not a prediction.

Mild Cognitive Impairment

Not the Same as Early Dementia

Mild cognitive impairment is measurable decline that does not interfere with independence. It does not always progress. Some people remain stable for years, and some return to normal performance, sometimes because a reversible contributor was found and treated. So it is not the same as early dementia, and describing it that way to a person is inaccurate. The label carries the same ethical difficulty as clinical high risk for psychosis. Applied to a group many of whom will not progress, it brings altered self-concept, altered treatment by others, and anxiety about a future that may never arrive. Against that, people often want an explanation for a change they have noticed. The designation gives access to monitoring and support, and some value the chance to plan. The resolution turns on communication. What is said, and how honestly the uncertainty is conveyed.

Genetic Contribution

3 Statements, Handled Carefully

Three statements define the genetics. Most cases are not directly inherited. The great majority of people who develop the disease did not have an affected parent, and the great majority with an affected parent do not develop it. Early-onset, directly inherited forms exist, and are rare. A small number of families carry them, typically with earlier onset. They are the exception, and should not be generalized. And one relatively common genetic variant is associated with elevated risk. Carrying it does not mean a person will develop the disease, and not carrying it does not mean they will not. So predictive testing for the common variant is not generally recommended. The result changes a probability without changing what anyone can do, and people often read a positive result as a prediction. Testing in the rare inherited families is different, and involves specialist genetic counselling.

The Other Principal Causes

Vascular, Lewy Body, Frontotemporal

Three other principal causes deserve description. Vascular neurocognitive disorder arises from disrupted blood supply to brain tissue. The classic description is a stepwise course, but it is often gradual, especially with small vessel disease. Its early features involve executive function and processing speed, rather than episodic memory. And it frequently co-occurs with Alzheimer pathology. Mixed disease is common in older people. Lewy body disease produces a characteristic combination. Fluctuating cognition, which can resemble delirium. Visual perceptual disturbance. Parkinsonian motor features. And sleep disturbance, which may precede everything else by years. People with Lewy body disease can be severely sensitive to certain medication classes, and adverse reactions can be serious. Prescribing needs specialist involvement. That caution is all this course states. Frontotemporal disorders affect the frontal and anterior temporal regions. The behavioral variant changes personality, social conduct, and motivation, with memory relatively preserved early. The language variants affect speech production, or word and object meaning. Onset is typically younger than in Alzheimer's disease, often in working age.

Table 20.3.1

The First Symptoms Are the Best Clue

This comparison matters more than any other in this section. The pattern of first symptoms is the most informative diagnostic clue, because these conditions converge as they progress. Alzheimer's begins with episodic memory, with personality and conduct preserved. Vascular disease begins with executive function and processing speed. Lewy body disease begins with fluctuation, visual disturbance, parkinsonism, and sleep changes. And frontotemporal disorders begin with personality and conduct, or language, with memory preserved, and at a younger age. Other causes include Parkinson's disease, Huntington's disease, and rare, rapidly progressive prion diseases. And normal pressure hydrocephalus, a disturbance of the fluid around the brain, produces gait difficulty, cognitive change, and urinary symptoms. It is named because it is potentially treatable. Some causes of progressive decline are not progressive, if identified.

Diagnosis

Exclude First, Then Name, Then Attribute

Diagnosis follows a pathway. History and collateral history establish the timeline, the baseline, and which domain was affected first. Next, excluding reversible contributors. This is the step that most changes outcome, and the one most often hurried. Cognitive assessment then characterizes the pattern across domains. The syndrome is identified, major or mild. And the cause is attributed, as a separate question. Identifying the syndrome and attributing the cause are often collapsed into one. Imaging is used mainly to exclude other pathology, and to look for supportive patterns, not to make the diagnosis. Biomarker methods shift attribution toward pathology, which is a real advance. But they raise a serious question about detecting pathology in someone without symptoms. And access, cost, and individual interpretation remain unresolved.

In the Clinic

Delivering the Diagnosis Well

What people want from the diagnostic conversation is fairly consistent, and it often differs from what they receive. They want to be told, honestly and directly. Withholding a diagnosis removes the person's ability to plan, and to make decisions while they are best able to. They want it with time, and without euphemism, but not bluntly. Blunt delivery without support leaves people with a diagnosis and nothing else. They want to know what it means for them specifically, and what is not known, including that progression is variable. They need follow-up arranged, because very little of this conversation is retained. And they want to hear what can be done. A great deal helps, and saying so is accurate, not consoling. Practical matters are best raised early, while the person can fully take part. Driving, finances, and advance planning, recording preferences for future care while capacity is not in question.

Management

No Treatment Halts the Disease

No treatment currently halts the underlying disease. That is stated plainly, because it is true, and often obscured. Everything here improves symptoms, function, or wellbeing, without altering the disease process. Certain medication classes have evidence of limited symptomatic benefit, with modest effects on cognition and function in some people, and no effect on progression. Non-drug approaches are primary. Environmental adaptation, like clear signage, consistent placement, and good lighting, reduces demand on impaired systems. Routine supports function through preserved procedural memory. Meaningful activity, matched to the person's history and preferences, shows some of the most consistent effects on wellbeing and distress. Structured cognitive and social stimulation has reasonable evidence. And carer education and support is a core component, not an add-on. Notice that the intervention people ask about first has the most limited effect.

Personhood and Risk

Care for the Person - and Honest Prevention

The framing of dementia as a loss of personhood is inaccurate and harmful, and correcting it is a clinical intervention. People living with dementia keep their preferences, emotions, relationships, and identity. Emotional responses, and awareness of how they are treated, persist well beyond the point where events can be recalled. Much of what is attributed to the disease is attributable to how the person is being treated, and where they are. So speak to the person, not about them in their presence. That basic competency is breached constantly. On risk reduction, evidence links risk with education, hearing, vascular health, physical activity, smoking, alcohol, social contact, and air pollution. Three qualifications apply. Risk reduction is not prevention. People who did everything associated with lower risk still develop the disease. The evidence is largely observational, and reverse causation is a live concern, since early disease can reduce activity years before diagnosis. Presenting these associations as a way to avoid the disease overstates what is known, and blames people who develop it anyway.

Case Vignette 1 (Composite)

Margaret: A Typical Alzheimer Presentation

Now two composite cases, constructed for instruction. Margaret is seventy-six. Her son brought her in after noticing repeated questions and missed appointments. It started about eighteen months ago as forgetfulness, which they both dismissed as age. She has missed appointments and two bill payments, and now writes everything down. She manages her personal care, cooking, and household without difficulty. The history shows a gradual course, so no acute process. Episodic memory was affected first, while her language, personality, and navigation are unchanged. Reversible contributors were excluded properly. Medications, thyroid, vitamins, metabolism, and hearing. And depression, the contributor most likely to be missed here, because her bereavement offered a ready explanation for low mood. She needs no help with everyday activities, so the syndrome is mild. And the pattern is characteristic of Alzheimer's disease, recorded with the strength the evidence supports. Note that just age delayed this by more than a year.

Case Vignette 2 (Composite)

Douglas: A Behavioral Presentation Misattributed

Douglas is fifty-eight. His employer's occupational health service referred him after changes at work. He has no psychiatric history, and his wife describes him as reserved, punctilious, and considerate. Over about two years, he has made uncharacteristic remarks to colleagues, lost interest in work he cared about, shown less concern for others, changed his eating, and developed rigid routines. He was first assessed as having depression, with personality change under stress. That was not careless. His memory was intact, routine investigation was normal, and the picture maps convincingly onto depression. Three things identified the error, and none of them was visible on the day. The change was progressive, not episodic. It was entirely out of character, as his wife said repeatedly. And it affected social cognition and personality, with memory preserved, the reverse of the Alzheimer pattern, and characteristic of a behavioral-variant frontotemporal presentation. His younger age fits that condition. So a new, progressive, out-of-character change in conduct in middle age warrants a neurocognitive assessment, even when memory is intact. Ask the informant when the person stopped being themselves.

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FAQ

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About Progressive Memory Loss and Alzheimer's Disease, Features and Stages

What are the early signs of Alzheimer's disease?
Alzheimer's disease typically begins with episodic memory problems, such as repeated questions, difficulty retaining recent conversations, and growing reliance on notes. Vocabulary, general knowledge, long-practiced skills, and personality usually stay intact early on. As the disease progresses, language, executive function, and navigation become affected, while social conduct and personality are typically affected later, which helps distinguish it from frontotemporal conditions.
What causes Alzheimer's disease?
No cause of Alzheimer's disease is established. The disease is characterized by amyloid plaques outside neurons and tau tangles inside them, with loss of neurons and connections, starting in medial temporal memory regions. The amyloid account, which proposes amyloid buildup as the initiating event, remains the dominant framework, but many amyloid-targeting treatments have not delivered the predicted clinical benefit, so tau, inflammatory, and vascular accounts are also pursued.
Is Alzheimer's disease hereditary?
Most cases of Alzheimer's disease are not directly inherited, and most people with an affected parent do not develop it. Rare inherited early-onset forms run in a small number of families. A relatively common variant, APOE e4, raises risk, but carrying it does not mean a person will develop the disease, and lacking it does not rule the disease out. For that reason, predictive testing for the common variant is not generally recommended.
How do vascular, Lewy body, and frontotemporal dementia differ from Alzheimer's?
These conditions differ most in their first symptoms. Alzheimer's begins with episodic memory loss. Vascular neurocognitive disorder tends to start with slowed processing and executive problems. Lewy body disease brings fluctuating cognition, visual disturbances, parkinsonian movement features, sleep changes, and severe sensitivity to certain medications. Frontotemporal disorders begin with changes in personality and social conduct or language, with memory relatively preserved, and often start at working age.

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