Low Operator Index During PWA

A low Operator Index during PWA most often indicates a measurement quality issue rather than a device malfunction. The most common causes are incorrect cuff size, imprecise cuff placement, poor arm positioning, or patient movement during capture.

Step 1: Confirm Patient Preparation and Stillness

Before adjusting any hardware, verify that the patient:

• Has rested comfortably for at least 5 minutes.
• Is relaxed, not talking, and not moving during the measurement.
• Has their back and arm supported throughout.

Step 2: Verify Cuff Size

• Select an appropriately sized cuff for the patient's limb.
• Confirm the cuff index mark falls within the printed range when the cuff is wrapped. If it falls outside the range, switch to a different cuff size.

Step 3: Verify Cuff Placement

• Place the cuff on bare skin on the upper arm (remove tight or bulky clothing).
• Center the cuff over the brachial artery (palpate if needed).
• Align the artery marker over the brachial artery and in line with the patient's small finger.
• Position the cuff as high as possible on the arm, approximately 1–2 cm above the elbow crease.
• Ensure tubing is not compressed or restricted.

Step 4: Confirm Cuff Fit and Arm Position

• Fasten the cuff snugly — two fingers should fit between the arm and the cuff.
• Ensure the middle of the cuff is level with the heart.
• Confirm the arm is supported on a table or armrest (not held up by the patient).

Step 5: If Quality Issues Persist

• Allow an additional 1–2 minutes of rest, reposition the cuff, and repeat.
• If the issue continues, try the other arm and document the change.