Medicine

Parkinson's Disease (PD)

A neurodegenerative disorder primarily affecting movement due to the loss of dopamine-producing neurons in the substantia nigra.

Motor Symptoms of Parkinson's Disease

Common symptoms include resting tremor, bradykinesia (slowness of movement), rigidity (muscle stiffness), and postural instability (balance difficulties).

Pathophysiology of Parkinson's Disease

Characterized by the loss of dopaminergic neurons in the substantia nigra leading to dopamine deficiency in the basal ganglia.

Diagnosis of Parkinson's Disease

Primarily clinical based on motor symptoms, response to levodopa, and brain imaging to rule out other conditions.

Management of Parkinson's Disease

Levodopa is the mainstay treatment, along with dopamine agonists, MAO-B inhibitors, and physical therapy.

Non-Motor Symptoms of Parkinson's Disease

Includes autonomic dysfunction (e.g., constipation, orthostatic hypotension) and cognitive decline in later stages.

Lewy Body Dementia (LBD)

A progressive neurodegenerative disorder with cognitive decline and Lewy bodies in the brain, sharing features with both Alzheimer’s and Parkinson’s diseases.

Core Symptoms of Lewy Body Dementia

Involves parkinsonism, early cognitive decline, vivid visual hallucinations, and fluctuating cognition.

Pathophysiology of Lewy Body Dementia

Characterized by the accumulation of Lewy bodies (alpha-synuclein protein) affecting motor and cognitive functions.

Diagnosis of Lewy Body Dementia

Based on clinical symptoms including early cognitive decline, visual hallucinations, and parkinsonism.

Management of Lewy Body Dementia

May include cautiously administered levodopa, cholinesterase inhibitors for cognitive symptoms, and antipsychotics for hallucinations.

Differences Between Parkinson's Disease and Lewy Body Dementia

PD has later-onset cognitive symptoms while LBD features early cognitive decline and hallucinations.

Visual Hallucinations in Parkinsonism

Less common in early Parkinson's Disease but common early in Lewy Body Dementia, indicating a Parkinson's Plus Syndrome.

Parkinsonism Definition

A motor syndrome that can occur in various neurodegenerative disorders, including PD and LBD.

Fluctuation of Cognition in Lewy Body Dementia

Marked fluctuations in alertness and cognition, especially early in the disease.