Skillnaden mellan Parkinsons sjukdom och Lewy body-demens

Du försöker förstå skillnaden mellan Parkinsons sjukdom och Lewy body-demens, och vad det innebär för någon du älskar. Kanske nämnde en läkare Parkinsons sjukdom vid ett besök och Lewy body-demens vid ett annat. Kanske har du läst om det ena tillståndet och ständigt ser det andra nämnas. Kanske är själva diagnosen otydlig och du försöker räkna ut vilket tillstånd som stämmer överens med det du ser.

Denna förvirring är helt förståelig eftersom de två tillstånden har samma bakomliggande problem i hjärnan. Båda innebär ansamlingar av onormalt protein som kallas Lewy-kroppar. Båda kan orsaka darrningar, stelhet, långsamma rörelser och förändringar i tänkandet. Symtomen överlappar så mycket att det ibland tar till och med erfarna neurologer månader att avgöra vilket tillstånd de har att göra med.

Trots det är Parkinsons sjukdom och Lewy body-demens skilda tillstånd. De följer olika mönster, uppträder i olika ordning och kräver olika vårdinsatser. Skillnaden påverkar val av läkemedel, vilka symtom man bör hålla utkik efter och hur man planerar för framtiden.

Denna artikel förklarar hur de skiljer sig åt, varför tidpunkten för symtomen spelar roll och vad diagnosen innebär för den vård din närstående behöver.

Varför Parkinsons sjukdom och Lewy body-demens liknar varandra

Lewy-kroppar är klumpar av ett protein som kallas alfasynuklein, vilka samlas inuti hjärnceller och stör deras funktion. Eftersom samma typ av proteinansamling finns vid båda tillstånden finns det en naturlig överlappning av symtom. 

Rörelseproblem, såsom stelhet eller darrningar, kan förekomma vid båda. Detsamma gäller förändringar i tänkande, minne eller humör. Problem med blodtryck, förstoppning och andra automatiska kroppsfunktioner kan också förekomma vid båda tillstånden. 

Även behandlingarna överlappar varandra. Många av de läkemedel som används vid Parkinson hjälper också vid Lewy body-demens. Sjukgymnastik, arbetsterapi och logopedi är till nytta för personer med båda tillstånden. De vårdstrategier som familjer lär sig kan ibland tillämpas på båda.

Det är därför läkare ibland har svårt att skilja dem åt, särskilt i ett tidigt skede. De tittar på samma bakomliggande problem som påverkar hjärnan. Men var dessa Lewy-kroppar samlas först och hur snabbt de sprider sig skapar den avgörande skillnaden mellan Parkinsons sjukdom och Lewy body-demens.

Huvudskillnaden mellan Parkinsons sjukdom och Lewy body-demens

Huvudskillnaden mellan Parkinsons sjukdom och Lewy body-demens handlar om vilka symtom som visar sig först och när.

Vid Parkinsons sjukdom visar sig rörelseproblem först. Din närstående kan få darrningar, röra sig långsammare eller ha problem med balansen. Dessa motoriska symtom uppträder vanligtvis flera år innan några märkbara förändringar i tänkande eller minne märks av. Vissa personer med Parkinsons sjukdom utvecklar aldrig demens. Andra utvecklar kognitiva problem mycket senare, ofta ett decennium eller mer efter att rörelsesymtomen började.

Vid Lewy body-demens uppträder kognitiva symtom tidigt i sjukdomen. Problem med tänkande, minne, uppmärksamhet eller visuell förmåga visar sig i början eller inom det första året efter att rörelsesymtomen har uppstått. De kognitiva förändringarna är en central del av tillståndet från start, inte något som kan utvecklas senare.

Neurologists use a guideline called the one-year rule to make this distinction. If movement symptoms appear more than a year before significant cognitive problems, the diagnosis is typically Parkinson’s disease. If cognitive symptoms appear first or within a year of movement symptoms, the diagnosis is usually Lewy body dementia.

This timeline is the clearest difference between Parkinson’s and Lewy body dementia, and it affects treatment decisions, what symptoms to monitor, and how to plan care.

Parkinson’s Disease Symptoms and Progression

Parkinson’s disease usually shows up first through changes in movement. You might notice your loved one’s hand trembling while they’re sitting or relaxing. They might move more slowly than usual, taking longer to get dressed or walk across a room. Their steps might become shorter and shuffled. Their faces might show less expression than they used to.

These motor symptoms gradually worsen over time. Stiffness increases. Balance becomes more difficult. Daily tasks that used to be simple require more effort and concentration.

Cognitive changes, if they develop, typically come much later. In the early years of Parkinson’s disease, most people’s thinking and memory remain largely intact. They can manage their finances, follow complex conversations, and make decisions about their care. The person you’re caring for is still fully themselves, even as their body becomes harder to control.

When cognitive problems do develop in Parkinson’s disease, they often affect executive function first. This means your loved one might have trouble with planning, organizing, or multitasking. They might struggle with complex decisions or take longer to process information. Memory problems can develop, but they’re usually not the first or most prominent symptom.

Many people with Parkinson’s disease maintain good cognitive function for years or decades. Some never develop significant dementia. The movement symptoms remain the primary challenge throughout the course of the disease.

Symtom och sjukdomsförlopp vid Lewy body-demens

Lewy body dementia often begins in ways that seem confusing or hard to pin down. Your loved one might have trouble following a conversation or seem less alert than usual. They might get lost in familiar places or struggle with tasks that require visual-spatial skills, like judging distances or recognizing objects.

Attention and alertness often fluctuate significantly. Your loved one might seem clear and capable one hour, then confused or drowsy the next. These changes can happen multiple times throughout the day, making it hard to predict when they’ll be at their best.

Visual hallucinations are common early in Lewy body dementia, sometimes appearing before other symptoms become obvious. Your loved one might see people, animals, or objects that aren’t there. They usually know these visions aren’t real, at least at first, but the hallucinations can still be disturbing or frightening.

Movement problems typically appear around the same time as cognitive symptoms or develop shortly after. The motor symptoms look similar to Parkinson’s disease: stiffness, slow movement, balance problems, and sometimes tremor. But in Lewy body dementia, these movement changes aren’t the first thing families notice.

Sleep problems often show up early too. Your loved one might act out their dreams, talking, shouting, or moving during sleep in ways that can be violent or dangerous.

The combination of cognitive fluctuations, hallucinations, movement problems, and sleep disturbances happening together or in quick succession is characteristic of Lewy body dementia. Each symptom alone could have other causes, but the pattern together suggests Lewy body dementia.

How Treatment Differs for Parkinson’s vs Lewy Body Dementia

Understanding whether your loved one has Parkinson’s disease or Lewy body dementia affects several important aspects of their care.

Medication sensitivity is the most critical difference. People with Lewy body dementia can have severe, dangerous reactions to standard antipsychotic medications often prescribed for hallucinations or agitation. These drugs can cause sudden worsening of movement symptoms, extreme sedation, or life-threatening complications. Doctors who understand the diagnosis know to avoid these medications or use them only with extreme caution.

The cognitive symptoms in Lewy body dementia also require different management strategies. Because attention and alertness fluctuate so much, you need to time important conversations, medical appointments, and activities for when your loved one is most alert. You learn to work with the fluctuations rather than fighting against them.

Care planning looks different too. With Parkinson’s disease, you might have years to discuss future care preferences while your loved one can fully participate in decisions. With Lewy body dementia, cognitive changes appear earlier, so advance care planning becomes urgent sooner. 

The progression patterns differ as well. Lewy body dementia typically progresses faster than Parkinson’s disease. Knowing this helps you prepare for changes and make realistic plans about care needs, living situations, and support services.

Treatment priorities shift based on the diagnosis. In Parkinson’s disease, maximizing movement and independence often takes priority. In Lewy body dementia, managing cognitive symptoms, hallucinations, and safety concerns become equally or more important than addressing motor problems.

Parkinson’s Disease Dementia vs Lewy Body Dementia

If your loved one was diagnosed with Parkinson’s disease for several years and now has developed dementia, they might receive a diagnosis of Parkinson’s Disease Dementia (PDD). This comes under the same heading of Dementia with Lewy Bodies (DLB).

The difference between Parkinson’s disease dementia and Dementia with Lewy Bodies (DLB) comes down to timing. Both involve Lewy bodies that cause motor and cognitive symptoms. They both come under the heading of Lewy Body Dementia (DLB). The medical management is often similar. What matters most is that your care team understands the full picture of what your loved one is experiencing.

Your loved one might develop motor and cognitive symptoms almost simultaneously, making it hard to say which came first. The pattern of symptoms might change over time, making the initial diagnosis less certain. If the diagnosis changes or remains unclear, this doesn’t necessarily mean the doctors made a mistake. 

Focus on managing the symptoms that are affecting your loved one’s quality of life, regardless of which diagnostic box they fit into.

Getting the Right Diagnosis: Parkinson’s or Lewy Body Dementia

Getting an accurate diagnosis takes time and careful observation, as no single test can definitively diagnose either Parkinson’s disease or Lewy body dementia. Doctors usually rely on tracking symptoms over time, performing neurological examinations, and sometimes ordering brain scans to rule out other conditions.

You play an important role in this process. Try to keep detailed notes about what symptoms you’re seeing and when they started, and bring these observations to medical appointments. Doctors can’t always see the full picture during a brief office visit, so your firsthand account of what’s happening at home will provide the crucial information they need to make an accurate diagnosis.

Despite your efforts, the diagnosis may remain uncertain for quite some time. This uncertainty is frustrating, but it reflects the reality that these conditions can be quite challenging to distinguish, especially early on.

Seeing a specialist who understands these conditions makes a real difference. Movement Disorder Neurologists and behavioral neurologists work with Lewy body diseases regularly. They know what symptoms to watch for, which medications are dangerous, and how to adjust treatment as the disease changes.

If you have questions about what you’re seeing or need help finding the right specialists, we’re here to help. Our helpline is available every day of the year from 8am to 8pm Eastern time at 516-218-2026 or 833-LBDLINE. You can also reach us by email at norma@lbdny.org.