Frostbite is freezing of the skin and the tissue under it in extreme cold. The fingers are among the parts most at risk, along with the toes, nose and ears. Dr. Jindal sees frostbite in trekkers and mountaineers returning from high-altitude expeditions in the Himalaya, including Everest. A common story is that gloves were taken off for a few minutes, to take photographs, handle ropes or adjust equipment, or that the gloves worn were not warm enough or had become wet.
How serious is it?
- Frostnip: the fingers are cold, numb and pale, but recover fully once warmed. It is a warning sign.
- Superficial frostbite: the skin turns white or waxy. After warming it may swell and form blisters filled with clear fluid. It usually heals.
- Deep frostbite: the finger is hard, blue-grey or blackish, and blisters may be filled with blood. Deeper tissue is affected, and part of the finger may be lost.
First aid on the mountain
- Get out of the wind and cold as soon as possible. Remove wet gloves and any rings.
- Do not rub the fingers, and do not rub them with snow. This adds damage.
- Do not rewarm the fingers if there is a chance they will freeze again before you reach safety. Thawing and refreezing does more harm than staying frozen. Keep them dry and protected until you are somewhere warm.
- Once safe, rewarm the hands in warm, not hot, water (about 37 to 39 °C, comfortably warm to an unaffected hand) until the skin is soft and colour returns, usually 15 to 30 minutes. Rewarming is painful, and pain relief helps. Do not use a fire, stove or heater, because numb skin burns easily.
- Do not burst blisters. Cover the hand loosely with a clean, dry dressing, with gauze between the fingers, and keep the hand raised.
- Get medical help early. For severe frostbite, specialised hospitals can sometimes give medicines that improve blood flow to the fingers, but these work best when started within the first day or so. Tell the expedition doctor or team leader as soon as you notice symptoms.
Treatment after you return
Frostbite is treated patiently. Blisters and wounds are dressed, the hand is kept moving with therapy, and the fingers are watched closely. It often takes several weeks for the line between healthy and damaged tissue to become clear. Scans can sometimes help to show which tissue will survive. Surgery to remove any tissue that has died is usually delayed until this is clear, so that as much length as possible is saved.
Where part of a finger is lost, the hand can often be reconstructed later with skin cover (flaps and skin cover) or by restoring finger length. Some people have lasting cold sensitivity, numbness, stiffness or nail changes after frostbite, and hand therapy helps with these.
