Which neurotransmitter is primarily deficient in Parkinson’s disease?

NORCET 10 Mains

Medical & Surgical Nursing

Easy

Appeared in: NORCET 10 Mains

Explanation

Parkinson's disease is a neurodegenerative disorder characterized by the progressive death of dopamine-producing cells in a part of the brain called the substantia nigra.
This cell death leads to a significant deficiency of the neurotransmitter dopamine.
Dopamine is essential for coordinating and controlling movement, so its absence causes the classic motor symptoms of Parkinson's: tremor, rigidity, and slowness of movement (bradykinesia).

Option B: Acetylcholine is not deficient in Parkinson's disease. Instead, the loss of dopamine creates a relative excess or overactivity of acetylcholine.
Option C: While serotonin levels can be reduced in Parkinson's disease, this is not the primary neurotransmitter deficiency. The reduction in serotonin is associated with non-motor symptoms like depression and anxiety, not the core motor deficits.
Option D: GABA (Gamma-aminobutyric acid) is the main inhibitory neurotransmitter in the brain. Its function within the brain's motor circuits is disrupted as a secondary consequence of dopamine loss, but it is not the primary deficient neurotransmitter.

Visual 1: Diagram: Comparison of a healthy brain and a Parkinson's brain, highlighting the substantia nigra and the reduced dopamine pathways.
Visual 2: Flowchart: Illustrating the dopamine-acetylcholine imbalance in Parkinson's disease and how it leads to motor symptoms.

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.
Understanding that dopamine deficiency is the core problem is crucial for educating patients on why they are prescribed medications like Levodopa (a dopamine precursor) or dopamine agonists.
Nurses must monitor for the side effects of dopamine-enhancing drugs, such as dyskinesia (involuntary movements), hallucinations, and orthostatic hypotension.
What if? If a patient with Parkinson's disease develops severe depression, the nurse should recognize this is a common non-motor symptom, likely related to the disease's effect on other neurotransmitters like serotonin, and ensure the patient is assessed and treated for co-morbid depression.

How to Approach the Question

First, identify the key terms in the question: 'primarily deficient,' 'neurotransmitter,' and 'Parkinson's disease'.
Recall the fundamental pathophysiology of Parkinson's disease. The core of the disease is the loss of a specific type of neuron in a specific brain region.
Connect the lost neurons (in the substantia nigra) to the neurotransmitter they produce, which is dopamine.
Evaluate the other options. Consider if they are affected at all, and if so, whether their role is primary or secondary to the main deficiency.
Select the option that represents the central, causative deficiency for the main motor symptoms, not a secondary effect or a contributor to non-motor symptoms.

Concept Tested & Keywords

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