For accurate results, what percentage should the width of the cuff used in arterial segmentals be greater than the limb?

In arterial segmental measurements, it is crucial that the width of the cuff used is appropriate relative to the limb circumference to ensure accurate pressure readings. A commonly accepted guideline is that the width of the cuff should be at least 20% greater than the limb circumference. This helps in obtaining reliable and reproducible results when measuring arterial blood pressure in segmental studies, as it allows for better transmission of the pressure wave and minimizes the potential for artifacts or inaccuracies caused by using a cuff that is too narrow.

Using a cuff that is not adequately sized, either too small or not proportionate to the limb, can lead to errors in assessing peripheral arterial disease, as it may either falsely elevate or lower the pressure readings due to insufficient coverage. Thus, selecting a cuff that is 20% wider than the limb ensures that the pressure is correctly transmitted to the artery and improves the diagnostic utility of the measurements obtained.