Which of the following medications requires close observation for bronchospasm in the client with chronic obstructive pulmonary disease or asthma?

Appeared in: NORCET 5 Prelims - Sept 2023 (Shift-1)

Explanation

Propranolol is a non-selective beta-adrenergic blocker.
It blocks both beta-1 (heart) and beta-2 (lung) receptors.
Blockade of beta-2 receptors in the lungs inhibits bronchodilation and can lead to bronchoconstriction or bronchospasm.
This effect is particularly dangerous in individuals with pre-existing reactive airway diseases like asthma or COPD.
Therefore, non-selective beta-blockers are generally contraindicated in this patient population.

Option A: Verapamil is a calcium channel blocker. It works by relaxing blood vessels and reducing the heart's workload. It does not act on beta-2 receptors in the lungs and therefore does not cause bronchospasm.
Option B: Amrinone is a phosphodiesterase inhibitor used for short-term management of severe heart failure. Its primary action is to increase cardiac contractility and cause vasodilation; it does not induce bronchospasm.
Option C: Epinephrine is an adrenergic agonist that stimulates beta-2 receptors, causing potent bronchodilation. It is the drug of choice for treating acute, severe bronchospasm and anaphylaxis.

Visual 1: Diagram: A visual showing the location of Beta-1 receptors (primarily in the heart) and Beta-2 receptors (primarily in the lungs, blood vessels, and uterus). The diagram should illustrate how a non-selective blocker like Propranolol affects both, while a cardioselective blocker primarily targets Beta-1.
Visual 2: Flowchart: A decision-making flowchart for prescribing beta-blockers, showing the first question as 'Does the patient have asthma or COPD?'. If yes, it should lead to 'Avoid non-selective beta-blockers' and 'Use cardioselective beta-blockers with caution'.

Clinical Relevance

Nursing practice connection: Use the key finding related to Pharmacological side effects and contraindications in patients with respiratory conditions to guide bedside assessment, documentation, and the next nursing action.
A thorough medication and health history review is a critical nursing responsibility before administering any new drug, especially beta-blockers.
Nurses must educate patients on the signs of bronchospasm (wheezing, shortness of breath, coughing, chest tightness) and instruct them to seek immediate medical help if they occur.
What if? If the patient had hypertension but no asthma, Propranolol could be a suitable treatment. However, if a beta-blocker is essential for a cardiac condition in an asthma patient, a cardioselective beta-blocker (like Metoprolol or Atenolol) would be chosen and used with extreme caution, starting at a very low dose.

How to Approach the Question

First, identify the core of the question: which drug can worsen breathing in a patient with asthma or COPD?
This requires understanding the pathophysiology of bronchospasm (airway constriction).
Review the mechanism of action for each medication listed.
Verapamil is a calcium channel blocker; its primary effects are on the cardiovascular system.
Amrinone is a phosphodiesterase inhibitor for heart failure.
Epinephrine is a beta-agonist; it opens the airways.

Concept Tested & Keywords

Concept Tested: Pharmacological side effects and contraindications in patients with respiratory conditions.
Stem keywords: medications, bronchospasm, chronic obstructive pulmonary disease, COPD, asthma
Lead-in keywords: requires close observation
Clinical cues: The patient has a pre-existing respiratory condition (COPD or asthma), which makes them vulnerable to specific drug side effects.

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Practise the full NORCET 5 Prelims - Sept 2023 (Shift-1)

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