Which of the following shall be seen with use of a small size BP cuff?
**Core Concept**
The use of a small size blood pressure (BP) cuff is associated with a phenomenon known as "cuff size mismatch." This occurs when the cuff is too small for the patient's arm, leading to inaccurate blood pressure readings. The underlying principle is that the cuff should encircle the arm with a certain amount of overlap to ensure accurate measurement.
**Why the Correct Answer is Right**
When a small size BP cuff is used, it tends to overestimate systolic blood pressure and underestimate diastolic blood pressure. This occurs because the cuff is too tight, causing the artery to be compressed more than necessary, resulting in an artificially high systolic reading and a low diastolic reading. The mechanism behind this is the increased pressure exerted on the artery, which restricts blood flow and distorts the blood pressure waveform.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is a general statement about blood pressure cuffs, but does not specifically address the issue of cuff size mismatch.
* **Option B:** This option is incorrect because it describes a different phenomenon altogether, where the cuff is too large, leading to inaccurate readings due to reduced pressure on the artery.
* **Option C:** This option is incorrect because it is a symptom of hypertension, not a consequence of using a small size BP cuff.
**Clinical Pearl / High-Yield Fact**
When measuring blood pressure, it is essential to use a cuff that is the correct size for the patient's arm to ensure accurate readings. A general rule of thumb is to use a cuff with a bladder width that is 40% of the arm's circumference.
**Correct Answer: C. Overestimation of systolic BP and underestimation of diastolic BP.**