An aneurysm (aneurysm) is a bulging or dilation of an artery from a weak spot. To be considered an aneurysm (aneurysm), the artery's diameter should be at least ______ more than the normal range.

Appeared in: Raj. CHO - 2023

Explanation

An aneurysm is medically defined as a permanent, localized dilation of an artery that has at least a 50% increase in diameter compared to its expected normal diameter.
This means the artery's diameter has widened to 1.5 times its normal size.
This specific threshold distinguishes a true aneurysm from arterial ectasia, which is a more generalized or less severe dilation (less than 50% increase).

Option B: A 75% increase in diameter is a significant aneurysm, but it is not the minimum threshold for the definition. The question asks for the point at which a dilation is first considered an aneurysm.
Option C: A 20% increase in arterial diameter is not sufficient to be classified as an aneurysm.
Option D: A 35% increase in arterial diameter is also below the established 50% threshold for defining an aneurysm.

Visual 1: Diagram: Comparison of a normal artery, an ectatic artery (less than 50% dilation), and an artery with a fusiform aneurysm (greater than 50% dilation). This helps visualize the definitional difference.
Visual 2: Infographic: A chart showing the progression of Abdominal Aortic Aneurysm (AAA) size (e.g., <3cm, 3-4.4cm, 4.5-5.4cm, >5.5cm) and the corresponding surveillance or intervention recommendations for each stage.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition and Classification of Aneurysm as background academic context rather than a clinical decision trigger.
Understanding the 50% threshold is crucial for nurses when reviewing diagnostic reports (e.g., ultrasound, CT scans) to identify patients who meet the criteria for an aneurysm, which then dictates specific monitoring protocols and patient education.
Nurses play a key role in educating patients with small aneurysms about the importance of adherence to surveillance schedules and managing risk factors like hypertension and smoking to slow aneurysm growth and reduce rupture risk.
What if? If a patient's aortic diameter was 2.0 cm on a prior scan and is now 2.8 cm, the increase is 40% ([2.8-2.0]/2.0). This would be classified as ectasia, not yet an aneurysm. The nursing action would be to ensure the patient understands the need for continued monitoring and risk factor control, as it shows progression toward an aneurysm.

How to Approach the Question

This is a factual recall question that tests your knowledge of a specific clinical definition.
Identify the core of the question: what is the minimum percentage increase in diameter for a dilation to be called an 'aneurysm'?
Focus on the keyword 'at least,' which indicates you are looking for a minimum threshold, not just any value that would be considered an aneurysm.
Recall the standard medical definition. The 50% increase (or 1.5 times the normal diameter) is a fundamental value in vascular pathology.
Evaluate the options based on this fact. 50% is the correct threshold.
Eliminate the other options: 20% and 35% are too low and would be classified as ectasia. 75% is an aneurysm, but it's not the minimum value required for the definition.

Concept Tested & Keywords

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Practise the full Raj. CHO - 2023

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