Drug used to prevent aspiration and decrease the secretions is?

Appeared in: JIPMER Pondicherry NO - 2022

Explanation

Atropine is an anticholinergic (muscarinic antagonist) drug.
It works by blocking acetylcholine at muscarinic receptors, which inhibits parasympathetic stimulation of glands.
This results in a significant reduction of saliva and bronchial secretions (an antisialagogue effect).
By 'drying up' the airway, it reduces the volume of fluid available to be aspirated, making it a standard preanesthetic medication.

Option A: Adrenaline (epinephrine) is a sympathomimetic amine. Its primary actions are on alpha- and beta-adrenergic receptors, causing vasoconstriction, increased heart rate, and bronchodilation. It does not primarily decrease secretions.
Option B: Noradrenaline (norepinephrine) is a potent sympathomimetic that primarily stimulates alpha-adrenergic receptors, leading to powerful vasoconstriction. It is used to raise blood pressure in states of acute hypotension.
Option C: Dopamine is a catecholamine with dose-dependent effects. At low doses, it acts on dopamine receptors to improve renal blood flow. At higher doses, it stimulates beta-1 and alpha receptors to increase cardiac output and blood pressure. It does not reduce secretions.

Clinical Relevance

Nursing practice connection: Knowing Pharmacology of Preanesthetic Medications helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
As a preanesthetic medication, a nurse's role includes administering Atropine as prescribed and educating the patient about expected side effects like dry mouth and potential blurred vision.
Nurses must monitor for adverse effects of Atropine, such as tachycardia, urinary retention, and constipation, especially in elderly patients.
Atropine is contraindicated in patients with narrow-angle glaucoma because it can increase intraocular pressure.

How to Approach the Question

First, identify the key requirements of the question: the drug must both 'prevent aspiration' and 'decrease secretions'.
Recognize that decreasing secretions is the mechanism by which aspiration is prevented in this context (less fluid to inhale).
Evaluate the pharmacological class of each option. Adrenaline, Noradrenaline, and Dopamine are all sympathomimetics (adrenergic agonists).
Recall the primary effects of sympathomimetics, which mainly involve the cardiovascular system ('fight or flight' response) and do not include drying secretions.
Recall the primary effects of anticholinergic drugs. Their classic side effect is 'drying' (dry mouth, dry eyes), which corresponds to decreased secretions.
Identify Atropine as the classic anticholinergic agent among the options, making it the correct choice for reducing secretions.

Concept Tested & Keywords

QMnR89JnbH9O4aAzJRDSZR

E6 Pharmacology Nursing Lilley 11e Part 1 p. 318-320

Practise the full JIPMER Pondicherry NO - 2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.