Which statement correctly describes frostbite pathology?

Which statement correctly describes frostbite pathology?

• A. Dehydration of tissue
• B. Ice crystals form and expand mainly affecting distal extremities
• C. Heat expansion within tissues
• D. Skin color changes only without damage

Answer: (B)

Frostbite pathology centers on freezing tissue and the formation of ice crystals that physically disrupt cells and the microvasculature. When exposed to very cold, water in the tissue first freezes in the extracellular space, pulling water out of cells and causing cellular dehydration. If freezing continues, ice crystals can form inside cells, rupturing membranes and organelles. The expansion and mechanical damage from these ice crystals, along with reduced blood flow from cold-induced vasoconstriction, lead to tissue injury and necrosis. Distal extremities are most affected because they are the most exposed and have the least perfusion, so they are the first sites to freeze and sustain injury. This choice accurately reflects both the mechanism (ice crystal formation and expansion) and the tissue distribution (distal extremities). The other statements either oversimplify the process, misstate the mechanism, or imply no damage, which doesn’t fit frostbite pathology.

Frostbite pathology centers on freezing tissue and the formation of ice crystals that physically disrupt cells and the microvasculature. When exposed to very cold, water in the tissue first freezes in the extracellular space, pulling water out of cells and causing cellular dehydration. If freezing continues, ice crystals can form inside cells, rupturing membranes and organelles. The expansion and mechanical damage from these ice crystals, along with reduced blood flow from cold-induced vasoconstriction, lead to tissue injury and necrosis. Distal extremities are most affected because they are the most exposed and have the least perfusion, so they are the first sites to freeze and sustain injury. This choice accurately reflects both the mechanism (ice crystal formation and expansion) and the tissue distribution (distal extremities). The other statements either oversimplify the process, misstate the mechanism, or imply no damage, which doesn’t fit frostbite pathology.