Elevating a limb for less than 1 minute produces pallor followed by delayed reactive hyperemia in a dependent position. These signs indicate which of the following?

Elevating a limb for less than 1 minute produces pallor followed by delayed reactive hyperemia in a dependent position. These signs indicate which of the following?

• A. An intact circulatory system
• B. Arterial insufficiency
• C. Venous insufficiency
• D. Acute arterial occlusion

Answer: (B)

The signs point to arterial insufficiency. When you elevate a limb, gravity reduces arterial inflow to the distal tissues, so a pale color can appear if the arterial supply is compromised. If you then place the limb in a dependent position and the color returns slowly (delayed reactive hyperemia), that delay shows the arteries can’t quickly vasodilate and deliver blood to the tissues. Together, these findings indicate reduced arterial inflow rather than a problem with venous drainage or a totally blocked artery. Venous insufficiency tends to cause edema and a shift toward dusky or congested coloring with dependent positioning, not pallor on elevation. Acute arterial occlusion would present with sudden, severe symptoms such as acute pain, cold limb, numbness, and absent pulse, which is more urgent than the described pattern. An intact circulatory system would not exhibit pallor with elevation or a delayed return of color.

The signs point to arterial insufficiency. When you elevate a limb, gravity reduces arterial inflow to the distal tissues, so a pale color can appear if the arterial supply is compromised. If you then place the limb in a dependent position and the color returns slowly (delayed reactive hyperemia), that delay shows the arteries can’t quickly vasodilate and deliver blood to the tissues. Together, these findings indicate reduced arterial inflow rather than a problem with venous drainage or a totally blocked artery. Venous insufficiency tends to cause edema and a shift toward dusky or congested coloring with dependent positioning, not pallor on elevation. Acute arterial occlusion would present with sudden, severe symptoms such as acute pain, cold limb, numbness, and absent pulse, which is more urgent than the described pattern. An intact circulatory system would not exhibit pallor with elevation or a delayed return of color.