Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Parkinson Disease

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In one line

·Dopamine-making cells in the substantia nigra (the brain's movement-control station) are dying, so your body loses the chemical signal it needs to start and smooth out movement.

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Normal physiology

·The substantia nigra (a small dark cluster of cells deep in the midbrain) makes dopamine and sends it to the striatum (the brain's movement-control hub). Together they run a loop that starts every movement, sets its speed, and keeps it smooth. Picture that loop working perfectly—then every weird finding in Parkinson makes sense as a break in that loop.

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What goes wrong

·One upstream problem—dopamine cells dying in the substantia nigra—explains every symptom you see downstream.

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Hallmark signs

·Shaking in one hand or arm while at rest (resting tremor)
·Moving slowly overall (bradykinesia)
·Stiff, rigid muscles
·Trouble with balance and walking (postural instability)
·Smaller handwriting that gets tinier as you write (micrographia)
·Soft, mumbled speech and a flat facial expression (hypomimia)
·Trouble rolling over in bed or getting up from a chair
·Falls in the first year, trouble moving the eyes up and down, or early problems controlling blood pressure and bladder

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Red flags · escalate now

·Falls or severe balance problems within the first year of symptoms
·Eye-movement trouble, especially looking up or down (vertical gaze palsy)
·Blood pressure that drops sharply when standing, severe constipation, or loss of bladder control early in the illness
·Symptoms that are exactly the same on both sides of the body from the start (true Parkinson usually begins on one side)
·No improvement at all after a fair trial of levodopa (the main Parkinson medicine)

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Workup

·Clinical diagnosis (Movement Disorder Society criteria)
·DaTscan (dopamine transporter SPECT imaging)
·MRI brain (if atypical features present)
·Levodopa trial (carbidopa-levodopa 25/100 mg three times daily for 4–6 weeks)
·Thyroid-stimulating hormone (TSH)
·Serum ceruloplasmin and 24-hour urine copper (if age < 40)

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Treatment

·Carbidopa-levodopa (25/100 mg three times daily, titrated up)
·Physical therapy and structured aerobic exercise (30–60 minutes, 3–5 times per week)
·MAO-B inhibitors (rasagiline 1 mg daily or selegiline 5 mg twice daily)
·Dopamine agonists (pramipexole 0.5–4.5 mg daily or ropinirole 3–24 mg daily) for younger patients (age < 60–65)
·Catechol-O-methyltransferase (COMT) inhibitors (entacapone 200 mg with each levodopa dose)
·Selective serotonin reuptake inhibitors (SSRIs, e.g. sertraline 50–200 mg daily) or serotonin-norepinephrine reuptake inhibitors (SNRIs, e.g. venlafaxine 75–225 mg daily) for depression
·Deep brain stimulation (DBS) of the subthalamic nucleus or globus pallidus interna when medicines stop working or side effects become unbearable

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NCLEX trap

·Parkinson disease causes a resting tremor – the shake shows up when the hand is quiet and stops when the person moves. Propranolol is for essential tremor (a different kind of shake that happens during movement), not Parkinson disease. In Parkinson disease, carbidopa-levodopa replaces the missing dopamine and calms the tremor.
·Early falls and trouble moving the eyes up and down point to Progressive Supranuclear Palsy (a cousin of Parkinson disease that hits different brain parts first), not classic Parkinson disease. In Parkinson disease, cells in the substantia nigra (the brain's dopamine factory in the midbrain) die first, and balance problems come much later. PSP needs a different treatment plan – dopamine drugs do not help much.
·Never stop dopamine drugs suddenly in Parkinson disease. A sudden stop can trigger Parkinsonism-hyperpyrexia syndrome – the person becomes stiff as a board, spikes a dangerously high fever, and can die, just like malignant hyperthermia. Always taper slowly and overlap the new drug with the old one. Carbidopa-levodopa is the best medicine for Parkinson disease and should stay the backbone of treatment.
·Parkinson disease attacks the whole body, not just movement. Lewy bodies (clumps of a sticky protein called alpha-synuclein) spread through the brain and gut nervous system early. Always check for loss of smell, constipation, depression, trouble sleeping, and mild memory problems – these non-motor signs often show up before the tremor and are easy to miss if you do not ask.
·Poor balance (postural instability) comes LATE in Parkinson disease, usually years after the tremor and stiffness begin. If balance is bad at the very start, think of atypical parkinsonian syndromes (like PSP or multiple system atrophy), stroke, or vitamin B12 deficiency. Do not miss these mimics – they need different workups and treatments.
·Dopamine agonists like pramipexole can overstimulate reward pathways in the brain and cause impulse control problems – gambling, compulsive shopping, hypersexuality. This is a known side effect, not a reason to crash the dopamine system. Taper the agonist slowly and switch to another dopaminergic drug. A sudden stop can trigger withdrawal and rebound worsening.

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