Wound, Ostomy and Continence Nurses Society (WOCN) Practice Exam

Which of the following describes how to obtain ankle pressures for ABI?

1. Measure using a sphygmomanometer at the arm

2. Use a cuff and Doppler on the ankle bilaterally

3. Check the toe pressure with a sphygmomanometer

4. Measure the pressure in the capillaries

The correct answer is: Use a cuff and Doppler on the ankle bilaterally

To obtain ankle pressures for Ankle-Brachial Index (ABI) measurements, using a cuff and Doppler on the ankle bilaterally is the appropriate method. This approach is crucial because ABI assesses the blood flow in the lower extremities by comparing the blood pressure in the ankle with the blood pressure in the arm. Utilizing a Doppler device allows for accurate determination of the systolic pressure at the dorsalis pedis or posterior tibial arteries, which is essential for an accurate ABI calculation. The process is typically done bilaterally to ensure a comprehensive assessment of circulation in both legs, which can reveal asymmetries indicating vascular pathology. The other options do not provide the correct methodology for obtaining ABI measurements. For instance, measuring with a sphygmomanometer at the arm does not address ankle pressure or provide the necessary comparative measurements required for ABI. Checking toe pressure might be relevant in certain contexts but is not part of the standard ABI procedure. Measuring the pressure in the capillaries does not give a direct measurement related to ABI and would not be informative for assessing peripheral arterial disease. Thus, the use of a cuff and Doppler on the ankle bilaterally is the most reliable and accepted practice for obtaining ankle pressures in this assessment