Parkinson’s Disease

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Parkinson’s Disease

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 Parkinson’s Disease

1. Definition

Parkinson’s Disease (PD) is a chronic, progressive neurodegenerative disorder of the central nervous system, primarily affecting movement. It is caused by the degeneration of dopaminergic neurons in the substantia nigra pars compacta of the basal ganglia.

2. Etiology / Causes

  • Idiopathic (most common): No clear cause, but linked to age and genetics.

  • Genetic factors: Mutations in genes such as LRRK2, PARK7, PINK1, SNCA.

  • Environmental factors: Long-term exposure to pesticides, toxins, heavy metals.

  • Secondary Parkinsonism: Can be caused by head trauma, stroke, infections, or certain drugs (antipsychotics, reserpine, metoclopramide).

3. Risk Factors

  • Age > 60 years

  • Male gender (slightly more common than female)

  • Positive family history

  • Exposure to pesticides, rural living

  • Head injury history

4. Pathophysiology

  • Loss of dopamine-producing neurons in the substantia nigra → reduced dopamine in the striatum.

  • Imbalance between dopamine and acetylcholine → impaired control of voluntary movement.

  • Formation of Lewy bodies (abnormal protein deposits of alpha-synuclein) inside neurons.

  • Leads to the classic motor symptoms of PD.

5. Clinical Features

🔹 Motor Symptoms (cardinal signs)

  1. Tremor – typically resting tremor ("pill-rolling")

  2. Rigidity – stiffness of muscles ("cogwheel rigidity")

  3. Bradykinesia – slowness of movement, difficulty initiating movement

  4. Postural instability – impaired balance and increased risk of falls

🔹 Other motor features

  • Shuffling gait (short steps, reduced arm swing)

  • Freezing episodes (sudden inability to move)

  • Reduced facial expression ("masked face")

  • Soft, monotone speech (hypophonia)

🔹 Non-motor symptoms

  • Cognitive decline, dementia in later stages

  • Depression, anxiety, sleep disturbances

  • Autonomic dysfunction (constipation, orthostatic hypotension, urinary problems)

  • Fatigue, pain, anosmia (loss of smell)

6. Diagnosis

  • Clinical diagnosis (no single test). Based on symptoms & neurological exam.

  • Diagnostic criteria: UK Brain Bank Criteria or MDS Clinical Diagnostic Criteria.

  • Imaging: MRI to rule out other causes; DaTSCAN can show reduced dopamine activity.

  • Response to Levodopa therapy is also supportive for diagnosis.

7. Complications

  • Falls and fractures

  • Aspiration pneumonia (due to swallowing problems)

  • Dementia and severe cognitive impairment

  • Social isolation and depression

8. Medical Management

  • Levodopa + Carbidopa → most effective treatment (replaces dopamine).

  • Dopamine agonists (e.g., pramipexole, ropinirole).

  • MAO-B inhibitors (selegiline, rasagiline) to slow dopamine breakdown.

  • COMT inhibitors (entacapone) to prolong Levodopa effect.

  • Deep Brain Stimulation (DBS) for advanced PD not responding to medication.

9. Physiotherapy / Rehabilitation Management

The role of physiotherapy is crucial to maintain mobility, independence, and quality of life.

🔹 Goals

  • Improve mobility & balance

  • Prevent falls

  • Maintain muscle strength and flexibility

  • Promote independence in daily activities

  • Reduce secondary complications (contractures, deconditioning)

🔹 Physiotherapy Interventions

  1. Gait Training:

    • Cueing strategies (visual or auditory cues) to overcome freezing.

    • Treadmill training with body-weight support.

    • Walking with large, exaggerated steps to counter shuffling gait.

  2. Balance Training:

    • Static and dynamic balance exercises.

    • Functional training (sit-to-stand, turning).

  3. Strength & Flexibility Exercises:

    • Strengthening core, lower limb, and postural muscles.

    • Stretching to reduce rigidity (especially trunk rotation & hip flexors).

  4. Postural Training:

    • Corrective exercises for stooped posture.

    • Yoga, Tai Chi, Pilates.

  5. Respiratory Training:

    • Breathing exercises to improve chest expansion.

    • Speech therapy collaboration for hypophonia.

  6. Home Exercise Program:

    • Encourage regular walking, cycling, swimming.

    • Daily stretching and mobility exercises.

10. Prognosis & Prevention

  • PD is progressive and incurable, but progression can be slowed.

  • Good physiotherapy + medication helps patients remain functional for years.

  • Life expectancy is slightly reduced, mainly due to complications (falls, pneumonia).

  • Prevention: No guaranteed method, but physical activity, healthy diet, and avoiding toxins may reduce risk.
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    11.protocol of treatment 

    European

    Physiotherapy

    Guideline for

    Parkinson’s Disease


أخر المواضيع من قسم : Neurological Conditions

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