Parkinsons's disease is caused by:

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2023

Medical & Surgical Nursing

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2023

Explanation

Parkinson's disease is fundamentally a movement disorder resulting from the death of dopamine-producing cells.
The specific brain region affected is the substantia nigra, located in the midbrain.
This cell death leads to a deficiency of the neurotransmitter dopamine, which is essential for smooth, controlled muscle movements.
The pathological hallmark of the disease is the presence of Lewy bodies, which are abnormal protein clumps (α-synuclein) inside nerve cells.
The resulting imbalance between low dopamine and relatively high acetylcholine levels causes the characteristic motor symptoms.

Option B: This describes a brainstem stroke (Cerebrovascular Accident). A stroke is an acute vascular event with sudden onset, whereas Parkinson's is a chronic, progressive neurodegenerative disease.
Option C: This is the classic description of Guillain-Barré Syndrome (GBS). GBS is an acute inflammatory demyelinating polyneuropathy affecting the peripheral nervous system, not a central neurodegenerative disorder.
Option D: This describes the pathophysiology of Myasthenia Gravis, an autoimmune disorder affecting the neuromuscular junction.

Clinical Relevance

Nursing practice connection: Knowing Pathophysiology of Parkinson's Disease helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
The primary goal of nursing care is to manage symptoms, promote safety, and maintain the highest possible quality of life.
Medication adherence is critical. Levodopa/Carbidopa must be given on a strict schedule to avoid 'on-off' fluctuations in motor function.
Fall prevention is a major safety priority due to postural instability and shuffling gait. Nursing interventions include environmental modification and patient education.

How to Approach the Question

First, identify the core of the question, which asks for the cause (pathophysiology) of Parkinson's disease.
Recall the key features of major neurological disorders. Parkinson's is known as a movement disorder related to dopamine.
Evaluate each option against your knowledge. Option A directly links degeneration of a specific brain area (substantia nigra) to dopamine depletion, which is the hallmark of Parkinson's.
Analyze the other options to confirm they describe different conditions. Option B is a stroke, Option C is Guillain-Barré Syndrome, and Option D is Myasthenia Gravis.
By correctly identifying the pathophysiology of Parkinson's and differentiating it from other neurological diseases, you can confidently select the correct answer.

Concept Tested & Keywords

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