In a COPD patient aminophyline has given the mode of action of this drug?

NORCET 3 - 2022 (Shift-2)

Pharmacology

Easy

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

Aminophylline is a methylxanthine drug that acts as a bronchodilator, making it the correct answer.
Its primary mechanism involves relaxing the smooth muscles of the bronchial airways, which helps to open up the air passages and improve breathing in conditions like COPD.
This relaxation is achieved by inhibiting the phosphodiesterase (PDE) enzyme, leading to an increase in intracellular cyclic AMP (cAMP).
Aminophylline is a combination of theophylline and ethylenediamine; theophylline is the active bronchodilating agent.

Option B: Anticholinergic drugs work by blocking acetylcholine, a different pathway for bronchodilation. Aminophylline does not primarily act as an anticholinergic.
Option C: Mucolytics are drugs that break down mucus to make it easier to cough up. While helpful in COPD, this is not the primary action of aminophylline.
Option D: Anti-tussives are cough suppressants. While a cough can be a symptom of COPD, aminophylline's main role is to open the airways, not suppress the cough reflex.

Visual 1: Diagram: A flowchart illustrating the mechanism of action of methylxanthines, showing inhibition of phosphodiesterase leading to increased cAMP and resulting in bronchodilation.
Visual 2: Table: A comparison table of different drug classes used in COPD (Bronchodilators, Anticholinergics, Mucolytics, Corticosteroids) with their mechanisms and examples.

Clinical Relevance

Nursing practice connection: Use the key finding related to Pharmacology: Mode of Action of Aminophylline in COPD to guide bedside assessment, documentation, and the next nursing action.
Aminophylline has a narrow therapeutic window (5-15 mcg/mL). Nurses must monitor for signs of toxicity, including nausea, vomiting, tachycardia, and seizures. Serum theophylline levels should be checked regularly.
Patient education is critical. Advise patients to avoid excessive caffeine intake (coffee, tea, cola, chocolate) as it can increase the risk of side effects.
What if? If a patient on aminophylline develops new-onset cardiac arrhythmias and tremors, the nurse's first action should be to withhold the next dose and notify the physician immediately, as these are signs of toxicity.

How to Approach the Question

First, identify the core of the question: it asks for the 'mode of action' of a specific drug, 'aminophylline', in a 'COPD patient'.
Recall or look up the drug class for aminophylline. It is a methylxanthine.
Review the primary function of the methylxanthine class in respiratory diseases. Their main effect is relaxing bronchial smooth muscle.
Evaluate the given options: 'Bronchodilator' directly describes the effect of relaxing bronchial smooth muscle.
Eliminate the other options by defining their mechanisms. 'Anticholinergic', 'Mucolytic', and 'Anti-tussive' represent different drug classes with distinct actions that do not match aminophylline's primary function.
Confirm the choice. Aminophylline's role as a bronchodilator is its key therapeutic action in COPD.

Concept Tested & Keywords

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