Alzheimer Disease vs Dementia with Lewy Bodies
Alzheimer Disease and Dementia with Lewy Bodies are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Alzheimer Disease vs Dementia with Lewy Bodies at a glance
- Alzheimer Disease: Most common neurodegenerative dementia; insidious memory loss with cortical amyloid and tau pathology.
- Dementia with Lewy Bodies: Neurodegenerative dementia with fluctuating cognition, recurrent visual hallucinations, parkinsonism, and REM sleep behavior disorder.
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Side-by-side comparison
| Feature | Alzheimer Disease | Dementia with Lewy Bodies |
|---|---|---|
| At a glance | Most common neurodegenerative dementia; insidious memory loss with cortical amyloid and tau pathology. | Neurodegenerative dementia with fluctuating cognition, recurrent visual hallucinations, parkinsonism, and REM sleep behavior disorder. |
| Classic presentation | Profound short-term memory loss with relatively preserved older memories and intact remote procedural memory; hippocampal/medial temporal atrophy on MRI.; Insidious onset, gradual progression over years; Early: episodic short-term memory loss (forgetting recent conversations, repeating questions, misplacing items), word-finding… | Elderly patient with fluctuating cognition + well-formed visual hallucinations + parkinsonism + history of acting out dreams.; Cognitive fluctuations: pronounced day-to-day or hour-to-hour variation in attention, alertness, and coherence; Recurrent visual hallucinations — typically well-formed people or animals, often non-threatening;… |
| Workup / key labs | NIA-AA: probable AD dementia = insidious onset, progressive cognitive decline, predominant memory or non-amnestic syndrome, exclusion of other causes. Biomarker-supported (CSF or imaging) AD if available.; Reversible-cause screen: CBC, BMP, calcium, LFTs, TSH, B12, folate; consider HIV, RPR, heavy metals if risk factors; Depression… | McKeith 2017 criteria: dementia + core features (fluctuating cognition, visual hallucinations, RBD, parkinsonism). Probable DLB = ≥2 core features OR 1 core + ≥1 indicative biomarker (DaTscan, MIBG, polysomnography-confirmed RBD).; TSH, B12, syphilis, HIV (reversible cognitive impairment screen); Comprehensive metabolic panel;… |
| Imaging | MRI brain (or CT if MRI contraindicated): generalized and disproportionate medial temporal/hippocampal atrophy; excludes vascular disease, NPH, masses, subdural; FDG-PET: temporoparietal hypometabolism; Amyloid PET (florbetapir, florbetaben, flutemetamol): positive cortical amyloid; required for anti-amyloid therapy candidacy; Tau PET… | MRI brain — relative sparing of medial temporal lobes (vs prominent hippocampal atrophy in AD); DaTscan SPECT — reduced striatal dopamine transporter uptake (indicative biomarker); FDG-PET — occipital hypometabolism with cingulate island sign; MIBG cardiac scintigraphy — reduced uptake reflecting cardiac sympathetic denervation |
| First-line treatment | Cholinesterase inhibitor (AChE inhibitor) — donepezil, rivastigmine (oral or transdermal patch), galantamine; modest symptomatic benefit for mild-to-moderate AD; rivastigmine and galantamine require BID dosing; side effects include nausea, diarrhea, anorexia, bradycardia, vivid dreams, urinary urgency; NMDA receptor antagonist —… | Cholinesterase inhibitors — rivastigmine (oral or transdermal), donepezil, galantamine — among the most responsive dementias to these agents; reduce hallucinations and improve cognition; Memantine — adjunct in moderate-severe disease; Carbidopa-levodopa for parkinsonism — start low, titrate slowly; full PD doses risk worsening… |
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