Undersupply of the neurotransmitter serotonin is linked to?

JSSH Staff Nurse - 2019

Pharmacology

Easy

Appeared in: JSSH Staff Nurse - 2019

Explanation

The monoamine hypothesis of depression posits that the condition is caused by a deficiency in monoamine neurotransmitters, most notably serotonin and norepinephrine.
Serotonin plays a critical role in regulating mood, sleep, and appetite; low levels are strongly correlated with the symptoms of depression.
This link is the basis for the primary pharmacological treatment for depression: Selective Serotonin Reuptake Inhibitors (SSRIs), which increase the availability of serotonin in the brain.
Research data indicates that serotonin binding is low in depression, and depletion of serotonin can precipitate depressive episodes.

Option A: Schizophrenia is primarily associated with an excess of dopaminergic activity, not a deficiency of serotonin. This is known as the dopamine hypothesis of schizophrenia.
Option B: Alzheimer's disease is a neurodegenerative disorder primarily characterized by a deficiency in the neurotransmitter acetylcholine, along with the presence of amyloid plaques and neurofibrillary tangles.
Option C: Parkinsonism (Parkinson's disease) is a motor disorder caused by the death of dopamine-producing cells in the substantia nigra, leading to a significant deficiency in dopamine.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Neurotransmitter imbalance and its relation to psychiatric disorders as background academic context rather than a clinical decision trigger.
Understanding the link between neurotransmitters and mental health is fundamental for nurses in medication administration and patient education. Knowing that SSRIs target serotonin helps in explaining the treatment rationale to patients with depression.
Nurses must monitor patients starting on SSRIs for potential side effects, including the paradoxical increase in suicidal ideation during the initial weeks of treatment before the mood-lifting effects begin. Another critical condition to monitor for is Serotonin Syndrome, characterized by agitation, confusion, rapid heart rate, and muscle rigidity.
What if? If a patient on an SSRI for depression also starts taking a triptan for migraines (which also increases serotonin), the nurse must be vigilant for signs of Serotonin Syndrome, as the combination of medications significantly increases this risk.

How to Approach the Question

First, identify the key terms in the question: 'undersupply' and 'neurotransmitter serotonin'. This directs you to recall knowledge about the functions and deficiencies of specific neurotransmitters.
Systematically review each option and its primary associated neurotransmitter imbalance.
Recall or deduce that Schizophrenia is linked to excess dopamine.
Recall or deduce that Alzheimer's disease is linked to decreased acetylcholine.
Recall or deduce that Parkinson's disease is linked to decreased dopamine.
This process of elimination leaves Depression, which is classically associated with an undersupply of serotonin according to the monoamine hypothesis.

Concept Tested & Keywords

Concept Tested: Neurotransmitter imbalance and its relation to psychiatric disorders.
Stem keywords: Undersupply, neurotransmitter, serotonin
Lead-in keywords: linked to
Negative lead-in flag: false

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E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) pp. 238-240, 1268-1270, 1161-1163