Bihar NHM CHO-2025: All of the following are selective beta-blockers, which primarily target only beta-1 receptors EXCEPT:

Bihar NHM CHO-2025

Pharmacology

Easy

Appeared in: Bihar NHM CHO-2025

Explanation

Propranolol is a non-selective beta-blocker, meaning it blocks both beta-1 (β₁) and beta-2 (β₂) receptors.
The question requires identifying the drug that is NOT a selective beta-1 blocker, making Propranolol the correct exception.
Blocking β₂ receptors, as Propranolol does, can cause bronchoconstriction, which is a key difference from selective blockers.

Option A: Bisoprolol is a cardioselective beta-blocker that primarily targets beta-1 receptors, fitting the description in the question stem.
Option B: Atenolol is a well-known cardioselective beta-1 blocker, used for conditions like hypertension and angina.
Option D: Metoprolol is a prototype cardioselective beta-1 blocker, making it one of the drugs described in the question stem.

Visual 1: Diagram - A chart illustrating the different types of beta-receptors (β₁ and β₂) and their locations in the body (heart, lungs, blood vessels). The diagram could show which drugs (selective vs. non-selective) act on which receptors.
Visual 2: Table - A comparative table listing common selective and non-selective beta-blockers, their primary indications, and major side effects, especially relating to respiratory and metabolic systems.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacological classification of beta-blockers based on receptor selectivity as background academic context rather than a clinical decision trigger.
Understanding the selectivity of beta-blockers is critical for patient safety. Administering a non-selective beta-blocker like Propranolol to a patient with asthma or COPD can trigger severe bronchospasm.
For patients with diabetes, non-selective beta-blockers can mask the adrenergic symptoms of hypoglycemia (like tachycardia and tremors), delaying recognition and treatment of low blood sugar.
What if? If the patient in question had a history of both hypertension and asthma, a cardioselective beta-blocker like Metoprolol or Atenolol would be the preferred choice over Propranolol to avoid triggering an asthma attack.

How to Approach the Question

First, identify the core concept: the classification of beta-blocker drugs.
Notice the keyword 'EXCEPT'. This means you are looking for the option that does not fit the description given in the stem.
The stem describes 'selective beta-blockers, which primarily target only beta-1 receptors'. Therefore, you need to find the non-selective beta-blocker in the list.
Recall or deduce the properties of each drug: Bisoprolol, Atenolol, and Metoprolol are known for being cardioselective (β₁).
Identify Propranolol as the classic example of a non-selective beta-blocker.
Conclude that Propranolol is the exception and therefore the correct answer.

Concept Tested & Keywords

Concept Tested: Pharmacological classification of beta-blockers based on receptor selectivity.
Stem keywords: selective beta-blockers, beta-1 receptors
Lead-in keywords: EXCEPT
Negative lead-in flag: The question asks for the exception among a group of similar items.