Acrocyanosis could be caused by which condition?

• A. Anemia and hypothermia
• B. Polycythemia and hyperthermia
• C. Anemia and hyperthermia
• D. Hypothermia only

Answer: (D)

Acrocyanosis occurs when the small vessels in the extremities constrict, reducing blood flow to the hands and feet. In newborns, this is commonly due to cold exposure—the peripheral circulation is still immature, so cooling causes vasoconstriction and a blue tint to the extremities while the core remains adequately perfused. This pattern is typically benign and improves with warming.

Anemia tends to cause pallor from reduced oxygen-carrying capacity, not a blue discoloration of the extremities. Hyperthermia causes skin vasodilation and warmth, often leading to flushed skin rather than blue extremities. Polycythemia can affect color as well, but it doesn’t produce the classic cold-induced, distal acrocyanosis pattern. Therefore, the presentation is most consistent with hypothermia only.