An adult blood pressure is measured with a cuff that is too narrow for the arm circumference. Which result is most likely?
Answer choices
- AFalsely low reading
- BFalsely high reading
- CNormal reading with only pulse pressure error
- DInability to hear Korotkoff sounds in all cases
About this question
What happens if a blood pressure cuff is too small or too narrow for the patient's arm? This is a classic NHA CCMA Clinical Patient Care vitals item. Exam writers love cuff-size errors because the direction of the bias is easy to reverse under time pressure. Read the wording and clinical context closely; those details determine the NHA CCMA competency being tested.
This practice question asks for the most likely reading error. A cuff that is too narrow for the arm circumference usually produces a falsely high blood pressure reading, because more pressure is needed to occlude the artery. An oversized cuff tends to read falsely low, the reverse trap. Match bladder width to arm circumference before you blame hypertension or hypotension on the patient. For blood pressure cuff too small falsely high, write the rule beside a counterexample so the distinction stays clear on later questions.
Reveal answer & explanationShow
Correct answer
- AFalsely low reading
- BFalsely high readingCorrect
- CNormal reading with only pulse pressure error
- DInability to hear Korotkoff sounds in all cases
Basic rationale
A cuff that is too small generally causes a falsely high blood pressure reading.
Option explanations
- A: Too narrow cuffs usually push readings upward, not downward.
- B: Correct. Small cuffs overestimate blood pressure.
- C: Cuff-size mismatch affects overall BP accuracy.
- D: The principal effect is measurement bias, not guaranteed inaudibility.
Deep Analysis
Core logic
Improper cuff size changes pressure transmission. A narrow cuff requires more pressure to occlude flow, producing artificially elevated readings.
Distractor analysis
A: Incorrect because falsely low values are more associated with oversized cuffs. C: Incorrect because cuff sizing error commonly affects absolute value, not only pulse pressure interpretation. D: Incorrect because Korotkoff sounds can usually still be heard; the main issue is inaccuracy.
Exam trap
Many learners reverse the cuff-size rule under test pressure.
Memory tip
Small cuff, big number. Large cuff, low number.
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