Diseases related to Alzheimer's : understand, distinguish and adapt practices in nursing home

In medical residences and Nursing homes, Alzheimer's disease occupies a central place in the training of caregiving teams. This is legitimate : it accounts for 60 to 70 % of dementia cases in France. However, this omnipresence sometimes creates a clinical blind spot : the Alzheimer's-related diseases — Lewy body dementia, frontotemporal dementia, vascular dementia, progressive supranuclear palsy, posterior cortical atrophy — are frequently underdiagnosed or wrongly equated with "classic" Alzheimer's disease.

This confusion is not without consequences. Adapting practices to Alzheimer's disease when actually dealing with Lewy body dementia risks inappropriate medication, poorly targeted stimulation, and a misunderstanding of behaviors that exhausts the team and increases the resident's suffering. Conversely, recognizing the specificity of each pathology allows for personalized support, prevents avoidable complications, and better supports families.

This guide is aimed at care professionals in medical residences : nursing assistants, nurses, activity coordinators, psychologists, occupational therapists, care coordinators. It does not replace a medical diagnosis but provides you with the keys to observe, alert, and adapt appropriately on a daily basis.

1. Overview of Alzheimer's-related diseases

The term “ dementia ” refers to a clinical syndrome characterized by a cognitive decline severe enough to impact daily life. This syndrome can be caused by many different pathologies. Alzheimer's disease is the most common form, but it is far from the only one.

The World Health Organization estimates that around 55 million people live with dementia worldwide, and this number is expected to double by 2050. In France, there are approximately 1.2 million affected individuals. Among them, 30 to 40 % have a pathology other than Alzheimer's or a mixed form involving several pathological mechanisms.

The main pathologies grouped under the term “ Alzheimer's-related diseases ” are as follows :

1. Frontotemporal dementia (FTD) — preferential involvement of the frontal and temporal lobes, often with early onset (50-65 years), marked by behavioral or language disorders at the forefront.
2. Lewy body dementia (LBD) — the second leading cause of degenerative dementia after Alzheimer's, characterized by a triad: cognitive fluctuations, early visual hallucinations, parkinsonian syndrome.
3. Vascular dementia — a consequence of cerebrovascular damage (Stroke, lacunes, leukoaraiosis), often progressing in fits and starts with relative preservation of episodic memory in the early stages.
4. Progressive supranuclear palsy (PSP) — atypical parkinsonian syndrome with vertical oculomotor dysfunction, early postural instability, and frontal dysexecutive syndrome.
5. Posterior cortical atrophy (PCA) — a variant of Alzheimer's with visual onset, spatial disorientation, early praxic disorders, and agnosia, but memory preserved for a long time.
6. Creutzfeldt-Jakob disease (CJD) — a rare spongiform encephalopathy, with very rapid progression (weeks to months), presenting polymorphically with cognitive disorders, myoclonus, and diffuse neurological signs.
7. Mixed forms — very common in elderly people, combining an Alzheimer component with a vascular component or Lewy body. These forms make differential diagnosis particularly complex.

2. Why distinguishing these pathologies is essential in Nursing homes

One might be tempted to think that, faced with a resident in a Nursing home whose dementia is advanced, the distinction between Alzheimer's and a related disease matters little: care will anyway focus on comfort, safety, and quality of life. This reasoning, although intuitively appealing, is erroneous for at least four major reasons.

Vital medication contraindications

Lewy body dementia perfectly illustrates this issue. Classic neuroleptics (haloperidol, chlorpromazine) are frequently prescribed to manage behavioral disorders in Alzheimer's disease. In LBD, they can cause severe hypersensitivity reactions, potentially fatal: extreme rigidity, coma, malignant hyperthermia. A resident with LBD hospitalized for agitation and treated with neuroleptics may not survive. The vigilance of the care team regarding signs suggestive of LBD can literally save a life.

Different cognitive stimulation modalities

Cognitive stimulation "standard" in Nursing home is often modeled on the needs of Alzheimer's disease: episodic memory exercises, recall of facts, temporal orientation. This approach is counterproductive, even painful, for a resident with FTD whose episodic memory is long preserved but who presents severe apathy or disinhibition. It is unsuitable for an ACP patient who no longer perceives space correctly. Adapting cognitive stimulation to the resident's actual neuropsychological profile is a condition for its effectiveness.

A better understanding of disruptive behaviors

Aggressiveness, disinhibition, and aberrant eating behaviors of an FTD resident are sometimes interpreted as "Alzheimer's agitation" and managed by inappropriate behavioral measures. Understanding that these behaviors are a direct consequence of frontal damage — and not of bad will or anxiety — radically changes the approach. The team can anticipate, structure the environment, and de-dramatize rather than react in urgency.

Better support for families

Families of residents with FTD or MCI are often bewildered by symptoms they had not anticipated. FTD, in particular, affects relatively young people and often presents with personality changes that those around interpret as a "change in character" or a psychiatric problem. A trained team can help the family recontextualize these behaviors within the framework of the disease, which reduces guilt and improves the quality of visits.

3. Frontotemporal dementia (FTD): when behavior takes precedence

Frontotemporal dementia is a group of degenerative pathologies characterized by a preferential involvement of the anterior frontal and temporal lobes. It differs from Alzheimer's disease by several major clinical features.

An earlier onset

The average onset age of FTD is 58 years, compared to 73 years for Alzheimer's. This difference is fundamental in Nursing home: a 60-year-old resident presenting severe behavioral disorders, whose episodic memory remains relatively preserved, should suggest FTD rather than atypical Alzheimer's. Care in a traditional geriatric structure is often unsuitable for these younger, more active profiles, with different social needs.

Three main clinical variants

FTD has three main presentations. The behavioral variant (bvFTD) is the most common (50% of cases). It manifests as disinhibition, apathy, loss of empathy, stereotyped behaviors, and changes in eating habits (hyperphagia, preference for sweets). Episodic memory is initially preserved, but executive functions are severely affected.

The semantic aphasic variant (DTS) is characterized by a progressive loss of meaning of words and concepts. The resident speaks fluently but empties their sentences of semantic content (“ thing ”, “ stuff ”, descriptions instead of names). They may no longer recognize famous faces or common objects. The non-fluent primary progressive aphasia (APPNF), the third variant, is manifested by significant speech efforts, apraxia of speech, progressive dysarthria with language comprehension preserved for a long time.

What this changes for the caregiving team

When faced with a DFTvc resident, the team should expect disconcerting behaviors: lack of modesty, inappropriate comments, excessive food consumption, rigidity regarding daily rituals. These behaviors are neither malice nor a refusal of authority: they are the direct consequence of frontal disinhibition. The strategy is not confrontation but reorientation and structuring.

4. Lewy body dementia (DCL) : vigilance regarding treatments

Lewy body dementia is the second leading cause of degenerative dementia, accounting for about 15 to 20 % of cases. It is caused by the accumulation of alpha-synuclein protein in neurons in the form of Lewy bodies, affecting the cerebral cortices and subcortical structures.

The characteristic clinical triad

The diagnosis of DCL is based on three cardinal symptoms. Cognitive fluctuations are significant variations in attention and alertness throughout the day or from one day to the next: the resident may be clearly awake and communicative in the morning, then prostrated and confused in the afternoon, without apparent reason. These fluctuations are often mistakenly interpreted as simulation or depression.

Early and recurrent visual hallucinations are almost pathognomonic of DCL. They are typically images of animals, children, or unknown people, often described with precision and relatively calmly by the resident. They may precede cognitive decline by several years. The spontaneous parkinsonian syndrome — rigidity, bradykinesia, postural instability, sometimes tremor — completes the triad.

Major medication risks

One of the most critical issues of DCL in Nursing homes is the extreme sensitivity to neuroleptics. Classic antipsychotics (haloperidol, chlorpromazine) as well as some atypical ones (risperidone, olanzapine) can cause in DCL a severe sensitivity syndrome: sudden worsening of cognitive disorders, massive rigidity, hyperthermia, stuporous state that can be fatal. This reaction occurs in 30 to 50 % of DCL cases exposed to neuroleptics.

Equally problematic: medications with anticholinergic effects (some antihistamines, tricyclic antidepressants, urinary antispasmodics) are poorly tolerated in DCL and worsen confusion. The care team must systematically alert the coordinating physician before introducing any new treatment for a resident suspected of DCL.

Appropriate support in Nursing homes

The hallucinations of DCL are rarely anxiety-provoking if one does not try to "correct" them. The most effective strategy is to not confront the resident about the reality of their visions, but to accompany them in their experience ("Do these people scare you? Would you like us to stay with you?"). Activities should take into account cognitive fluctuations: plan stimulation workshops at times of better alertness, usually in the morning.

5. Vascular dementia: a progression in fits and starts

Vascular dementia is the consequence of brain lesions of vascular origin: multiple infarcts, diffuse subcortical lesions (leukoaraiosis), or sequelae of a strategic Stroke affecting a key brain area. It represents about 15 % of dementias, but this proportion is likely underestimated due to the frequency of mixed forms.

A clinical presentation distinct from Alzheimer's

Unlike Alzheimer's, whose decline is progressive and regular, vascular dementia often evolves in a stair-step fashion: the patient experiences a sudden worsening at the time of a new vascular event, followed by a period of relative stability, then a new deterioration. This discontinuous progression is an important warning sign.

Episodic memory is often relatively preserved at the beginning of the evolution, unlike in Alzheimer's. It is the executive and attentional functions that are affected first: slow processing, planning difficulties, concentration disorders, psychomotor slowing. Associated neurological signs are common: gait disturbances, early urinary incontinence, pseudobulbar syndrome (spasmodic laughter and crying).

The vascular risk factors at the heart of prevention

Vascular dementia is the only form of dementia for which preventive action remains effective even after the first symptoms. The control of vascular risk factors — high blood pressure, diabetes, atrial fibrillation, dyslipidemia, smoking — slows the onset of new lesions and stabilizes the clinical picture. In a Nursing home, vigilance regarding blood pressure, anticoagulant treatment in case of fibrillation, and general therapeutic adherence are integral parts of care.

Adapting support to the vascular profile

The vascular resident tires quickly and shows a great variability in their performance depending on the time and conditions. Activities should be short, well-structured, with simple and clear instructions. Stimulation of executive functions — sorting, classifying, sequential organization of a task — is more relevant than episodic memory exercises. Attention to gait disorders and fall risks is also crucial.

6. PSP, ACM and other Parkinson-plus syndromes

Progressive supranuclear palsy (PSP)

PSP is an atypical parkinsonian syndrome caused by the accumulation of tau protein in the neurons of the brainstem and basal ganglia. It is distinguished from Parkinson's disease by early and severe postural instability (falls in the early years), a disorder of vertical gaze (difficulty looking down, a nearly pathognomonic sign), and a marked dysarthria.

The cognitive disorders of PSP are of the fronto-subcortical type: ideomotor slowing, dysexecutive syndrome, apathy. Episodic memory is initially preserved. Swallowing impairment is a severe and early complication, justifying careful monitoring and rapid adaptation of food texture.

Posterior cortical atrophy (PCA)

PCA is a variant of Alzheimer's disease in which lesions predominate in the parietal and occipital cortices. The clinical picture is dominated by early and severe visuospatial disorders: inability to locate objects in space, to read, to recognize faces or objects (visual agnosia), to perform complex gestures (apraxia). Memory and language are preserved for a long time, creating a disconcerting gap between the resident's verbal abilities and their functional incapacities.

In a Nursing home, the PCA resident is often perceived as "strange" or "faking" because they can hold a coherent conversation but are unable to find their room, recognize their plate, or use a spoon. Understanding this neuropsychological profile by the team is essential to adapt the environment (very marked visual signage, uncluttered environment, assistance with daily gestures) and avoid paradoxical injunctions.

7. Comparative table: distinctive signs by pathology

This table is a clinical orientation tool, not a diagnostic one. It serves to structure observation and formulate relevant questions for the coordinating physician or neurologist. Formal differential diagnosis relies on a complete neuropsychological examination, neuroimaging (brain MRI), and increasingly, biomarkers in the CSF or via PET-amyloid.

8. Practically adapting care practices

Knowing the different pathologies is necessary but insufficient. The added value of this knowledge is measured in the concrete adjustments it allows on a daily basis. Here’s how the specifics of each pathology translate into adapted care practices.

Communication and caregiver-resident relationship

In FTD, the relationship must be firm without being confrontational. The resident is unaware of their inappropriate behaviors (frontal anosognosia): arguing is pointless. The technique of diversion and proposing an alternative activity is more effective. The team must be prepared not to take inappropriate comments personally.

In MCI, cognitive fluctuations make exchanges very variable. The caregiver must adapt to the resident's level of alertness in the moment, not insist during phases of confusion, and resume communication during phases of better clarity. Hallucinations deserve an empathetic, not corrective response (“I don't see the same things you do, but I hear you”).

In the ACP, verbal comprehension being long preserved, the resident understands what is said to them. But the visual information reaches them distorted. The caregiver must verbally guide each action, describe orally what they are going to do, and avoid instructions that are only gestural.

Environmental Arrangement

For the resident DFT, structuring the environment means reducing uncontrolled stimulations (access to food, freedom to wander in unsuitable areas) while maintaining marked spaces of freedom. Rituals and routines are resources, not constraints: rely on them rather than break them.

For the resident ACP, the environment must be visually uncluttered and well marked. Brightly colored markers on the bedroom door, a clearly defined path to the dining room, contrasting tableware with the tablecloth: these simple arrangements significantly reduce functional disorientation and situations of failure.

For the resident PSP, fall prevention is a priority. The bed must be at a minimum height, the armchair must provide good back support to compensate for postural instability, and thick-soled shoes should be avoided. The bedside table and elements in the room must be accessible without the resident having to lower their gaze.

Nutrition and Nursing Care

Swallowing disorders are early in PSP and late in Alzheimer's disease. A speech therapy assessment of swallowing should be anticipated well before the appearance of significant aspiration. The texture and consistency of meals must be gradually adapted. Mealtime is also a risk moment for falls in PSP: the resident may lean back while trying to look at their plate.

In DFT, hyperphagia can be managed in small portions (several small servings) and by offering healthy alternatives freely accessible. Total removal of access to food causes great agitation; it is better to channel than to prohibit.

9. Cognitive Stimulation : what tools for what profiles ?

Cognitive stimulation in nursing homes is often thought of as a homogeneous block of beneficial activities for “ demented individuals ”. The neuropsychological reality is much more nuanced. Stimulating inappropriately can be as harmful as a lack of stimulation : a reminiscence activity for a FTD resident whose memory is preserved but whose behavior is disorganized exacerbates agitation without providing cognitive benefit. A reading exercise for a PCA resident without sensory adaptation is a source of failure and frustration.

General Principles of Differentiated Stimulation

The first principle is to start from the resident's real neuropsychological profile and not just the diagnosis. Two FTD residents can have very different profiles depending on the variant and stage of the disease. An updated neuropsychological assessment, even a brief one, guides the choice of activities more effectively than a five-letter diagnosis.

The second principle is to target preserved functions as much as deficient functions. Stimulating residual abilities maintains self-esteem and motivational engagement. A DCL resident may have long-preserved musical abilities (musical procedural memory) : music therapy is a powerful lever. A semantic variant FTD resident may benefit from manual work that appeals to procedural memory rather than language.

Digital Tools as Adaptable Stimulation Tools

Digital tools for cognitive stimulation offer a considerable advantage for Alzheimer's-related diseases : the fine modularity of exercises. Where a paper-pencil workshop offers a fixed level of difficulty, a tablet application can adapt in real-time the complexity, the number of distractors, the allowed response time, and the presentation modality (visual, auditory, combined).

For a resident DCL, exercises can be scheduled during the times of best alertness, with short sessions (10-15 minutes) and a simple interface. The tablet generates tracking data that allows for objective assessment of cognitive fluctuations: a performance graph over several weeks clearly shows variations, which helps the doctor adjust the care plan.

For a resident DFT behavioral variant, exercises focused on executive functions (sorting, sequencing, categorization) are more relevant than episodic memory exercises. Short activities with immediate feedback maintain attention better than long and open tasks. The tablet also offers a containing framework that structures the session and reduces wandering or distractibility behaviors.

For a resident ACP, exercises should minimize visuospatial tasks and enhance verbal understanding and language. Listening exercises, oral comprehension, verbal fluency, and semantic evocation are appropriate. The size of visual elements on the screen should be maximized and contrasts enhanced.

10. Working in a multidisciplinary team around differential diagnosis

The recognition and differentiated support of Alzheimer-related diseases cannot rely on a single professional. It is a team effort, structured around a common culture, shared transmission tools, and an organization that values and utilizes field observations.

The key role of daily observation

Nursing assistants, ASH, activity coordinators, and psycho-medical assistants are in direct and prolonged contact with residents. They are the first to notice warning signs: unusual fluctuations, new behaviors, hallucinations, atypical falls. But this observation is only valuable if it is communicated, formalized, and taken into account.

A simple and shared observation grid — listing the distinctive signs of the main pathologies — allows any caregiver, regardless of their qualification, to contribute to refining the clinical picture. These observations must be recorded in the care file with the date, time, context, and precisely described observed behavior. “ Agitation in the evening ” is insufficient. “ At 8:30 PM, called out several times to absent individuals, seemed to see someone in the hallway, was calmed by the silent presence of a caregiver for 10 minutes ” is clinically usable.

The multidisciplinary synthesis meeting

The synthesis meeting is where field observations become therapeutic decisions. For it to play this role in differential diagnosis, it must include a dedicated time for reviewing diagnostic hypotheses. A resident admitted with a presumed diagnosis of Alzheimer's disease may, over the months, show evocative signs of a MCI or a FTD. The synthesis meeting is the opportunity to formulate these questions and refer them to the coordinating physician or to seek a neurological opinion.

The ongoing training of the team plays a central role. A team that knows the clinical signs of the main pathologies observes differently. It formulates hypotheses, asks questions, and contributes to a more precise clinical picture. This collective competence directly improves the quality of care and the safety of residents.

The coordinating physician and the neurologist

The coordinating physician is the link between the observations of the caregiving team and medical decisions. Their role is to integrate clinical data, request additional assessments if necessary, and inform the team of the practical implications of the diagnosis. A formalized differential diagnosis — “ this resident presents with MCI, neuroleptics are formally contraindicated, adapt activity schedules to fluctuations ” — translates the clinical picture into concrete directives for the team.

Telemedicine now allows, in certain areas, to obtain a specialized neurological opinion without moving the resident. These systems facilitate access to expertise that is difficult to obtain in rural areas and allow for a review of diagnoses without long and destabilizing hospitalization for the resident.

Supporting and training teams continuously

Supporting residents with FTD, MCI, or PSP is emotionally demanding. Disinhibited behaviors, hallucinations, the extreme slowness of the PSP resident, the disconcerting fluctuations of MCI — all of this requires significant psychological resources from caregivers. Training is not enough if it is not accompanied by a space for discussion and analysis of practices.

Team supervision, discussion groups led by a psychologist, and short training sessions focused on concrete situations allow for the transformation of theoretical knowledge into solid and lasting practical skills. Caregivers who understand why a resident with ADHD behaves this way do not experience this support in the same way as those who interpret it as unwillingness.

Understanding the diseases related to Alzheimer's disease in their clinical uniqueness means providing each resident with the support that precisely corresponds to what they experience in their brain and body. It also gives caregiving teams a framework of understanding that transforms disturbing behaviors into intelligible clinical signs — and empowers caregivers from being helpless to being competent and calm professionals. This competence is acquired, shared, and maintained. It is at the heart of quality of life in a Nursing home.