In the finger pulse transducer method, systolic arterial pressure is indicated when the finger pulse returns as the cuff pressure is released.

In the finger pulse transducer method, systolic arterial pressure is indicated when the finger pulse returns as the cuff pressure is released.

• A. Cuff is inflated until finger pulse disappears
• B. Pressure released, blood flow returns, indicating systolic pressure
• C. The cuff is inflated to a fixed high pressure and held
• D. The finger pulse is tracked by a sensor during gradual inflation

Answer: (B)

In this method, systolic arterial pressure is determined by the cuff pressure at which pulsatile blood flow first returns to the finger as the cuff is deflated. When the cuff is inflated, the arterial flow to the finger is fully occluded, so no pulse is detected. As the cuff pressure is gradually released and falls below the systolic pressure, the artery opens enough to allow a pulse to reach the finger, and the transducer detects that pulsatile flow. That reappearance marks the systolic pressure. Why the other ideas don’t fit: inflating until the pulse disappears would indicate the point of complete occlusion, not the first return of flow; holding a high fixed pressure provides no moment of return to mark systolic pressure; tracking during inflation won’t identify the systolic moment since the pulse isn’t present until deflation begins.

In this method, systolic arterial pressure is determined by the cuff pressure at which pulsatile blood flow first returns to the finger as the cuff is deflated. When the cuff is inflated, the arterial flow to the finger is fully occluded, so no pulse is detected. As the cuff pressure is gradually released and falls below the systolic pressure, the artery opens enough to allow a pulse to reach the finger, and the transducer detects that pulsatile flow. That reappearance marks the systolic pressure.

Why the other ideas don’t fit: inflating until the pulse disappears would indicate the point of complete occlusion, not the first return of flow; holding a high fixed pressure provides no moment of return to mark systolic pressure; tracking during inflation won’t identify the systolic moment since the pulse isn’t present until deflation begins.