When measuring blood pressure, if a cuff that is too small is used on a patient, how will the BP reading be a… - NORCET 9 Prelims-2025

NORCET 9 Prelims-2025

Nursing Foundation

Easy

Appeared in: NORCET 9 Prelims-2025

Explanation

Using a blood pressure cuff that is too small for the patient's arm circumference will yield a falsely high reading.
This error occurs because a small cuff cannot apply pressure evenly and requires significantly more inflation pressure to fully occlude the brachial artery.
The device registers this excessive inflation pressure as the patient's blood pressure, leading to an overestimation.
This is a critical concept in vital signs assessment to avoid misdiagnosing a patient with hypertension.

Option B: A falsely low reading is the result of using a blood pressure cuff that is too large for the patient's arm.
Option C: An accurate reading can only be obtained when the blood pressure cuff is the correct size for the patient's arm circumference.
Option D: While an extremely ill-fitting cuff might make the procedure difficult, it does not typically make measurement impossible. Instead, it produces a predictably inaccurate result.

Visual 1: Diagram - An illustration showing the correct application of a blood pressure cuff, with labels indicating the bladder width should be 40% and the bladder length 80% of the arm circumference.
Visual 2: Infographic - A comparative chart showing three arms: one with a small cuff (labeled 'Falsely High'), one with a correct cuff (labeled 'Accurate'), and one with a large cuff (labeled 'Falsely Low').

Clinical Relevance

Nursing practice connection: Knowing Blood Pressure Measurement Errors helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Accurate blood pressure measurement is fundamental to nursing practice. Using the wrong cuff size is a preventable error that can lead to significant patient harm.
A falsely high reading could lead to an incorrect diagnosis of hypertension, resulting in unnecessary medication, patient anxiety, and further testing.
A falsely low reading (from a large cuff) could cause a missed diagnosis of hypertension, delaying treatment and increasing the risk of stroke, heart disease, and kidney disease.

How to Approach the Question

First, identify the key elements of the question: 'blood pressure', 'cuff that is too small', and 'how will the reading be affected?'.
This is a knowledge-based question about a common procedural error in nursing. Recall the principles of accurate blood pressure measurement.
Think about the mechanics: To stop blood flow, the cuff's pressure must be transmitted through the tissue to the artery. A small cuff concentrates pressure poorly and on a smaller area.
Reason that to compensate for poor pressure transmission, you would need to inflate the cuff to a higher level. This higher inflation pressure will be read as a higher blood pressure.
Evaluate the options based on this reasoning. A 'falsely high' reading is the logical outcome. A 'falsely low' reading is the opposite effect, which would be caused by a cuff that is too large. 'Accurate' is incorrect by definition of using the wrong equipment. 'Cannot measure' is less likely than getting an incorrect measurement.

Concept Tested & Keywords

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