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

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What is the first step in taking an ABI?

Measure the ankle pressure
Rest for at least 10 minutes
Record the patient's weight
Check the radial pulse

The correct answer is: Rest for at least 10 minutes

Resting the patient for at least 10 minutes before measuring the Ankle-Brachial Index (ABI) is an essential first step. This rest period helps ensure that the blood flow to the lower extremities is stabilized, allowing for more accurate and reliable pressure readings. During this time, any leg muscle activity that could temporarily increase blood flow can settle, providing a baseline for measurement. Establishing proper conditions for accurate measurement is crucial, as factors like recent activity can influence the results, potentially leading to misinterpretation of arterial health. By having the patient at rest, the clinician can avoid the pitfalls of transient changes in blood pressure caused by activity and ensure that the ABI reflects the patient's true vascular status. Thus, initiating the ABI process with this foundational step enhances the validity of the results, leading to better diagnoses and treatment plans for those with potential vascular issues.