Which receptor is blocked as a result of psychotropic drugs when a patient reports dry mouth, constipation, and blurred vision?
Serotonin (5-HT_2).
Acetylcholine (ACh).
Alpha (α_1).
Histamine (H_1).
The Correct Answer is B
Choice A rationale
Serotonin 5HT_2 receptors are targeted by many atypical antipsychotics and mood stabilizers. Blocking these receptors is associated with desired effects like improved mood and reduced psychosis, but also with side effects like weight gain or hypotension. It is not the primary mechanism responsible for dry mouth, constipation, and blurred vision, which are characteristic anticholinergic effects.
Choice B rationale
Acetylcholine (ACh) receptors, specifically muscarinic receptors, are blocked by many psychotropic drugs, especially older antidepressants and antipsychotics. This anticholinergic action inhibits parasympathetic nervous system responses, leading to the classic peripheral side effects: dry mouth (xerostomia), constipation (decreased peristalsis), and blurred vision (mydriasis/cycloplegia), which are directly mediated by ACh blockade.
Choice C rationale
Alpha-1 (α_1) adrenergic receptors are blocked by many psychotropic agents, especially antipsychotics. Blocking these receptors causes vasodilation and is primarily associated with orthostatic hypotension (dizziness upon standing) and reflex tachycardia. While it may sometimes contribute to overall side effect burden, it is not the direct cause of the triad of dry mouth, constipation, and blurred vision.
Choice D rationale
Histamine (H_1) receptors are blocked by many psychotropic drugs, particularly those with sedative properties. This blockade primarily leads to side effects such as sedation, drowsiness, and weight gain. While it contributes to the overall side effect profile, it is not the main pharmacological mechanism responsible for the distinct cluster of dry mouth, constipation, and blurred vision symptoms.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Occasional sleeplessness and anxiety are common, transient responses to stress or life events and do not, in isolation, suggest a diagnosable mental illness. These symptoms are often within the normal spectrum of human emotional and physiological responses, reflecting coping mechanisms that do not necessarily constitute a pathological syndrome causing significant functional impairment.
Choice B rationale
The ability to differentiate between "as if" (e.g., imagination, metaphor) and "for real" (e.g., reality) demonstrates an intact reality testing capacity, which is a hallmark of mental health. Impaired reality testing, such as experiencing hallucinations or delusions, would be a much stronger indicator of a potential mental illness, particularly psychosis.
Choice C rationale
A consistently sad, discouraged, and hopeless mood that persists over time and potentially impairs daily functioning is a cardinal symptom complex of Major Depressive Disorder. This constellation of persistent negative affect and cognitive distortion significantly deviates from typical emotional responses and suggests a pathological change in mood regulation and perception.
Choice D rationale
Experiencing difficulty with major life decisions is a normal, albeit stressful, part of the human experience. Indecisiveness can stem from various non-pathological factors, such as fear of commitment or evaluating complex variables. It only becomes indicative of mental illness if it is severe, pervasive, and accompanied by other clinical features, like profound anxiety or depression.
Correct Answer is B
Explanation
Choice A rationale
Placing a client on suicide precautions is an intervention (a safety measure) designed to prevent an attempt, not the priority outcome. The outcome is the measurable change in the client's status or behavior that demonstrates goal achievement. While precautions are essential for safety, the ultimate goal is the cessation of the life-threatening behavior itself.
Choice B rationale
Refrain from attempting suicide is the most direct and life-preserving priority outcome for a client with a nursing diagnosis of risk for self-directed violence: suicide. The immediate goal in this high-risk situation is the client's physical safety and survival, which is measurably achieved by the absence of suicidal behavior or gestures. All other goals are secondary to this primary safety objective.
Choice C rationale
Stating absence of feelings of powerlessness is a valuable intermediate or long-term outcome, as powerlessness is a contributing factor to suicidal ideation. However, it addresses the underlying etiology (related to) of the risk, not the life-threatening risk itself. Physical safety must take precedence over emotional or cognitive shifts in the immediate timeframe.
Choice D rationale
Attending a self-help group daily is a therapeutic intervention aimed at long-term coping and recovery, not the immediate priority outcome. While social support and engagement are crucial for preventing recurrence, they do not represent the primary, measurable, and immediate objective of protecting the client's life from imminent self-harm.
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