The nurse selects a blood pressure cuff that is too small for the patient's arm. Which of the following outcomes is most likely?

Rationale: A. This is incorrect because accuracy depends on using a correctly sized cuff. While a cuff that is too small may cause discomfort due to tightness, it will not provide a true measurement of the patient’s blood pressure. Discomfort alone does not ensure an accurate reading. B. A cuff that is too large for the patient can cause falsely low readings because the cuff more easily compresses the artery. However, when the cuff is too small, the opposite occurs: the nurse must inflate the cuff to a higher pressure to occlude the artery, resulting in a falsely elevated reading. C. Generally, a small cuff can still provide a reading. The problem is not that a measurement cannot be taken, but that the reading is inaccurate and consistently higher than the true blood pressure. D. Using a cuff that is too small for the patient’s arm circumference increases the pressure needed to occlude the artery, leading to an overestimation of both systolic and diastolic blood pressures. This is a common error in clinical practice, particularly in patients with larger arms. Using the proper cuff size — where the bladder width is approximately 40% of the arm circumference and the length covers 80–100% of the arm — ensures accurate blood pressure readings and reduces the risk of misdiagnosis or inappropriate treatment.