Dementia with Lewy Bodies (DLB)

Condition: Dementia with Lewy Bodies (DLB)

Brief Overview: Dementia with Lewy bodies (DLB) is a progressive neurodegenerative disorder associated with abnormal deposits of the protein alpha-synuclein, called Lewy bodies, within brain cells. These changes can affect thinking, attention, perception, movement, sleep, behavior, mood, and autonomic functions such as blood pressure regulation and digestion.

DLB is characterized by progressive cognitive decline that interferes with daily functioning. Common distinguishing features include:

Fluctuating cognition and alertness
Recurrent, well-formed visual hallucinations
REM sleep behavior disorder
Spontaneous parkinsonism, such as slowed movement, rigidity, tremor, or gait changes

Problems with attention, executive functioning, and visuospatial abilities may be prominent early in DLB, while significant memory impairment may become more noticeable as the disease progresses.

DLB vs. Parkinson's Disease Dementia

DLB and Parkinson's disease dementia are related disorders but are diagnosed separately.

DLB: Dementia occurs before, at approximately the same time as, or within 1 year of the onset of parkinsonian motor symptoms.

Parkinson's disease dementia: Dementia develops after Parkinson's disease has already been established, generally more than 1 year after the onset of motor symptoms.

This resource specifically addresses Dementia with Lewy Bodies (DLB).

Prevalence: According to UpToDate, “DLB, although once considered rare, is now recognized as one of the most common neurodegenerative causes of dementia, alongside Alzheimer disease (AD) and vascular dementia. Population-based and autopsy series suggest that Lewy body pathology is present in approximately 20 percent of older adults and that neocortical/diffuse Lewy body disease accounts for about 10 to 15 percent of autopsy-confirmed dementia cases, most often in combination with AD neuropathologic change. In population-based clinical studies, DLB incidence in the general population is on the order of 3 to 8 per 100,000 person-years, rising to approximately 50 to 160 per 100,000 person-years in individuals aged 65 years and older.”

Etiology: The exact cause of DLB is not fully understood.

DLB is associated with abnormal accumulation of alpha-synuclein within neurons. These abnormal deposits disrupt brain-cell function and are associated with changes in important neurotransmitter systems.

These include:

Acetylcholine, which is important for attention, learning, and memory.
Dopamine, which plays an important role in movement, cognition, motivation, mood, and behavior.

Risk Factors:

Increasing age
Family history: Having a relative with DLB may modestly increase risk, although most cases are not directly inherited.

Common Medications:

Cholinesterase inhibitors – donepezil, rivastigmine
Memantine
Antipsychotics for severe, refractory behavioral symptoms
Melatonin or clonazepam for REM sleep behavior disorder
Antiparkinson medication – carbidopa-levodopa

Common Labs, Imaging, and Tests:

Cognitive assessment, neuropsychological testing
Neuroimaging study (MRI)
Lab tests: vitamin B12, thyroid function studies

Commonly Associated Conditions:

REM sleep behavior disorder.
Parkinsonism.
Orthostatic hypotension.
Syncope or transient episodes of unresponsiveness.
Constipation.
Urinary dysfunction.
Depression.
Anxiety.
Apathy.
Excessive daytime sleepiness.
Recurrent falls.
Dysphagia.
Visual hallucinations.
Delusions.
Alzheimer's disease pathology, which may coexist with Lewy body pathology in some patients.

Common Symptoms:

Cognitive Symptoms

Fluctuating attention and alertness.
Episodes of staring or appearing "zoned out."
Periods of significant confusion alternating with greater clarity.
Difficulty concentrating.
Slowed thinking.
Difficulty planning and organizing.
Problems completing multistep activities.
Impaired judgment.
Difficulty judging distance or depth.
Difficulty recognizing or correctly interpreting visual information.
Memory impairment, particularly as disease progresses.

Cognitive fluctuations may occur over minutes, hours, or days.

Hallucinations and Behavioral Symptoms

Recurrent visual hallucinations.
Seeing people, children, animals, or objects that are not present.
Auditory or other hallucinations may also occur.
Delusions.
Misidentifying people or places.
Capgras-type beliefs that a familiar person has been replaced by an impostor.
Anxiety.
Depression.
Apathy.
Agitation.
Paranoia.

Visual hallucinations are often detailed and well-formed and may appear relatively early in the disease.

Parkinsonian/Movement Symptoms

Slowed movement.
Muscle rigidity.
Shuffling gait.
Difficulty initiating movement.
Tremor, although tremor may not be prominent in every patient.
Stooped posture.
Reduced arm swing.
Reduced facial expression.
Soft voice.
Difficulty rising from a chair.
Impaired balance.
Falls.
Difficulty swallowing.

Sleep Symptoms

REM sleep behavior disorder.
Talking or shouting while dreaming.
Punching, kicking, or flailing during sleep.
Falling out of bed.
Excessive daytime sleepiness.
Fragmented nighttime sleep.

REM sleep behavior disorder may begin years before dementia symptoms become apparent.

Autonomic Symptoms

Orthostatic hypotension.
Dizziness when standing.
Syncope.
Constipation.
Urinary urgency or incontinence.
Abnormal sweating.
Temperature-regulation problems.
Drooling.
Sexual dysfunction.

Common Treatments:

Medications (see above)
Establish a safe sleeping environment
Physical therapy, occupational therapy, and mobility aids may be needed if parkinsonism is present
Speech-language pathology may be needed
Treatment for depression/anxiety if present
Environmental, behavioral interventions
A predictable routine, calm communication, reassurance, adequate lighting, and reducing unnecessary stimulation may be helpful.

Neurology Symptom-Change Guidance

For any new neurologic symptom or change/worsening of an existing neurologic symptom, advise the patient or caregiver to contact the patient's neurologist to report the change.

Examples may include new or worsening:

Weakness.
Numbness or tingling.
Balance or walking difficulty.
Falls.
Tremor or other movement changes.
Vision changes.
Speech or swallowing difficulty.
Cognitive or behavioral changes.
Hallucinations.
Changes in level of alertness.
Pain or other symptoms related to the patient's neurologic condition.

If the reported symptoms meet criteria for urgent or emergency evaluation, do not delay care while waiting for the neurologist to respond. Follow organizational escalation protocols and direct the patient to the appropriate level of urgent or emergency care.

Care coordinators should not independently determine that a new or worsening neurologic symptom is an expected part of the patient's chronic condition.

If Patient Reports a New Symptom:

New or changed neurologic symptoms should be reported to the patient's neurologist. If symptoms warrant urgent or emergency evaluation, follow organizational escalation protocol rather than waiting for routine neurology follow-up.

Physical Findings:

Bradykinesia.
Rigidity.
Resting tremor.
Shuffling gait.
Reduced arm swing.
Stooped posture.
Postural instability.
Difficulty rising from a chair.
Masked facial expression.
Reduced voice volume.
Orthostatic decrease in blood pressure.
Impaired balance.
Fluctuating alertness or attention.

Potential Complications and Contraindications:

Potential complications include:

Progressive cognitive decline.
Increasing dependence with activities of daily living.
Falls and fall-related injury.
Syncope.
Orthostatic hypotension.
Aspiration.
Pneumonia.
Dysphagia.
Weight loss or malnutrition.
Constipation.
Urinary dysfunction.
Medication errors.
Driving-related safety concerns.
Wandering.
Hallucinations or delusions that create safety concerns.
Sleep-related injury associated with REM sleep behavior disorder.
Delirium during acute illness or hospitalization.
Caregiver stress and burnout.

Severe Neuroleptic Sensitivity

DLB is strongly associated with sensitivity to dopamine-blocking antipsychotic medications. Severe reactions may include profound sedation, confusion, dramatically worsened parkinsonism, autonomic instability, or neuroleptic malignant syndrome.

Neuroleptic Malignant Syndrome

Potential findings include:

High fever.
Severe muscle rigidity.
Significant change in mental status.
Autonomic instability.
Reduced responsiveness.

This is a medical emergency. Follow emergency protocols, call 911 for the patient if needed.

Sudden Change From Baseline — Important DLB Consideration

DLB naturally causes fluctuations in cognition and alertness. However, a new or abrupt deterioration that is clearly different from the patient's usual pattern should not automatically be attributed to DLB.

Potential causes include:

Infection.
Dehydration.
Medication adverse effects or interactions.
Pain.
Constipation.
Urinary retention.
Electrolyte or metabolic abnormalities.
Hypoglycemia or hyperglycemia.
Stroke.
Head injury.
Cardiopulmonary illness.
Surgery or anesthesia.
Sleep disruption.

Patients with DLB can be particularly vulnerable to delirium during illness or hospitalization. The DLB Consortium notes that comorbid medical disorders can cause significant worsening of mental status. Patients should be directed to call their provider, 911, or seek emergency care when needed. Follow emergency protocols, call 911 for the patient if needed.

General Health and Lifestyle Guidance:

Maintain a predictable daily routine.
Keep instructions simple and provide one task at a time when needed.
Use adequate lighting, particularly in hallways, bathrooms, and at night.
Remove loose rugs and clutter.
Use prescribed walkers, canes, or other assistive devices.
Rise slowly from sitting or lying positions if orthostatic symptoms are present.
Do not automatically increase salt or fluids for orthostatic hypotension without provider guidance, particularly when heart failure, kidney disease, or hypertension is present.
Maintain regular meals and monitor weight.
Report new chewing or swallowing difficulty.
Encourage physical activity appropriate for the patient's abilities and healthcare-provider recommendations.
Maintain regular sleep and wake times when possible.
Supervise medications when the patient can no longer manage them safely.
Maintain an updated medication list.
Review OTC medications and supplements with the healthcare team.
Ensure glasses and hearing aids are used when prescribed.
Maintain neurology and primary-care follow-up.
Consider physical therapy, occupational therapy, or speech therapy when indicated.
Discuss driving safety with the healthcare provider.
Consider a medical-alert system for patients with falls or syncope.
Encourage advance-care planning while the patient remains able to participate meaningfully in decisions.
Encourage caregivers to use respite care and support resources when needed.

REM Sleep Behavior Disorder Safety

For patients who physically act out dreams:

Report symptoms to the healthcare provider.
Remove sharp, breakable, or dangerous objects from around the bed.
Reduce the risk of injury from falling out of bed.
Address safety for the patient's bed partner.
Do not independently start sleep medications.

Suggested Questions to Ask Patients:

Because DLB can impair insight and recall, caregiver input is often especially valuable when appropriate permission and organizational processes are in place.

Cognition and Function

Have you noticed any changes in the patient's thinking or ability to concentrate since our last call?
Does the patient's alertness seem to vary significantly throughout the day?
Are these fluctuations typical for the patient, or is something clearly different?
Is the patient having more trouble managing medications, meals, appointments, finances, or household activities?
Does the patient need more help bathing, dressing, toileting, or getting around?
Has there been a noticeable decline in function since our last call?

Hallucinations and Behavior

Has the patient been seeing or hearing things that other people do not?
What is the patient seeing or hearing?
How often is this happening?
Are the hallucinations upsetting or frightening?
Are they causing the patient to do anything unsafe?
Has there been any new suspiciousness, agitation, delusions, or unusual behavior?
Did these symptoms develop gradually, or was there a sudden change?

Movement and Fall Risk

Is the patient moving more slowly or appearing more stiff?
Is there more difficulty standing from a chair?
Has the patient started shuffling or freezing while walking?
Has the patient fallen or almost fallen since our last call?
Is the patient using a cane, walker, or other prescribed device?
Does the caregiver feel the patient is safe walking independently?

Dizziness and Syncope

Does the patient feel dizzy or lightheaded after standing?
Has the patient fainted?
Have there been episodes when the patient seemed briefly unresponsive?
Have there been recent changes to blood pressure, Parkinson's, or other medications?
Is the patient eating and drinking normally?

Sleep

Does the patient talk, yell, punch, kick, or move around while dreaming?
Has the patient fallen out of bed?
Has the patient or bed partner been injured?
Is there significant daytime sleepiness?
Has the sleep pattern changed recently?

Swallowing and Nutrition

Is the patient having difficulty chewing or swallowing?
Has the patient coughed or choked while eating or drinking?
Has appetite decreased?
Has there been unexplained weight loss?

Bowel and Bladder Symptoms

Is the patient having difficulty with constipation?
When was the last bowel movement?
Has there been a significant change in bowel habits?
Are there new urinary symptoms?
Is the patient having difficulty emptying the bladder?

Medication Safety

Who manages the patient's medications?
Have any medications recently been started, stopped, or changed?
Has the patient recently been to urgent care, an emergency department, or the hospital?
Has the patient started a new sleep aid, antihistamine, bladder medication, pain medicine, or OTC product?
Is the patient taking medication for hallucinations or agitation?
If so, what medication?
Did alertness, walking, stiffness, hallucinations, or confusion change after the medication was started?

Caregiver and Home Safety

Who is helping the patient at home?
Is the patient routinely left alone?
Has the patient wandered or become lost?
Is the patient currently driving?
Does the caregiver feel the patient can safely be left alone?
Is the caregiver having difficulty meeting the patient's needs?
Does the caregiver feel additional assistance is needed?

⚠️ Telephone Escalation Guidance | Emergency — Call 911 / Emergency Evaluation

Follow organizational emergency protocol for:

Sudden facial droop, one-sided weakness, new speech difficulty, or other possible stroke symptoms.
New inability to awaken normally or prolonged unresponsiveness.
Severe difficulty breathing.
Severe choking or inability to protect the airway.
Serious fall with head injury, significant bleeding, loss of consciousness, severe pain, or inability to stand afterward.
Immediate danger of the patient harming themselves or another person.
Severe allergic reaction.
High fever with severe muscle rigidity, major mental-status change, or reduced responsiveness following antipsychotic exposure, which may indicate neuroleptic malignant syndrome.

Do not assume sudden neurological or mental-status changes are caused by the patient's dementia.

Key Care Coordinator Principle: DLB causes chronic cognitive fluctuations, but an abrupt change over hours or days that is clearly outside the patient's usual pattern warrants evaluation for an acute cause rather than being labeled dementia progression.

Suggested Talking Points:

Explaining DLB

"Dementia with Lewy bodies is a condition that can affect thinking, attention, movement, sleep, behavior, and functions such as blood pressure and digestion."

Explaining cognitive fluctuations

"With DLB, someone's alertness and thinking can change quite a bit from one time to another. Your healthcare providers still want to know about changes that are clearly different from their usual pattern."

Discussing sudden confusion

"A sudden increase in confusion isn't something we automatically assume is the dementia. Things like illness, dehydration, pain, constipation, or medication changes can cause sudden worsening."

Discussing hallucinations

"Seeing people, animals, or objects that aren't there can happen with DLB. If the hallucination isn't upsetting or unsafe, arguing about whether it's real can sometimes make things more stressful. We especially want the healthcare team to know if the hallucinations are new, suddenly worse, frightening, or creating a safety problem."

Discussing medication sensitivity

"People with DLB can be unusually sensitive to certain medications, particularly some medications used for hallucinations or agitation. Every healthcare provider should know about the DLB diagnosis before starting a new medication."

Discussing falls

"DLB can affect both balance and blood pressure, so dizziness, fainting, falls, and near-falls are important for us to track."

Discussing caregiver involvement

"As DLB progresses, managing medications and other daily activities safely can become more difficult. Having a family member or caregiver involved can become an important part of the care plan."

Suggested SMART Goal Examples

1. Fall Prevention
"I will remove loose rugs and clutter from the main walking areas of my home within the next 7 days."

2. Assistive Device Use
"I will use my prescribed walker every time I walk outside my bedroom for the next 30 days."

3. Medication Management
"My caregiver will help me review my medication organizer each day for the next 30 days to make sure my medications are taken as prescribed."

4. Updated Medication List
"I will keep an updated list of my prescription medications, OTC medications, and supplements with me for the next 3 months."

5. Symptom Monitoring
"My caregiver and I will document significant changes in my alertness, hallucinations, walking, or behavior at least 3 days per week for the next 4 weeks."

6. Home Lighting
"I will add night-lights between my bedroom and bathroom within the next week to reduce my fall risk."

7. Sleep Safety
"My caregiver and I will remove sharp or breakable objects from around my bed within the next 7 days because I sometimes act out my dreams."

8. Physical Activity
"Following my healthcare provider or therapist's recommendations, I will complete ___ minutes of safe physical activity ___ days per week for the next 4 weeks."

9. Constipation Monitoring
"I will track my bowel movements for the next 2 weeks and report significant or persistent constipation according to my healthcare provider's instructions."

10. Neurology Follow-Up
"I will schedule and attend my recommended neurology appointment within the next ___ days."

11. Caregiver Support
"My caregiver will identify at least one respite-care, caregiver-support, or community resource within the next 30 days."

12. Driving Safety
"I will discuss whether it is safe for me to continue driving with my healthcare provider at my next appointment."

13. Advance Care Planning
"I will discuss my healthcare decision-maker and advance-care-planning preferences with my family and healthcare provider within the next 30 days."

Sources:

⚠️ Medical Disclaimer

This resource is provided for educational and informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. The information presented is general in nature and may not apply to every individual or health situation.

Individuals should consult their physician or other qualified healthcare professional for personalized medical advice, diagnosis, or treatment recommendations related to their specific health conditions and should not begin any new exercise program or change their diet or medications without consulting their healthcare professional.

Call 911 if you are experiencing a medical emergency.