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High-Altitude Illness: How to Avoid It and How to Treat It
The higher you climb above sea level, the less oxygen there is in the air. The oxygen level becomes very low at altitudes above 8,000 feet. This causes problems for people who normally live at lower altitudes because their bodies aren't used to working on so little oxygen. If you stay at a high altitude for a long time, your body gets used to the low oxygen level, and you don't get sick from it. The following are the 3 main types of high-altitude illness:
High-altitude pulmonary edema (also called HAPE), which affects the lungs
High-altitude cerebral edema (also called HACE), which affects the brain
These illnesses can be serious, but they can also be prevented.
How can I prevent high-altitude illness?
You can do 2 important things to prevent high-altitude illness:
1. Take your time traveling to higher altitudes. When you travel to a high altitude, your body will begin
adjusting right away to the lower amount of oxygen in the air, but it takes several days for your body to adjust completely. If you're healthy, you can probably safely go from sea level to an altitude of 8,000 feet in a few days. But when you reach an altitude above 8,000 feet, don't go up faster than 1,000 feet per day. The closer you live to sea level, the more time your body will need to get used to a high altitude. Plan your trip so your body has time to get used to the high altitude before you start your physical activity.
2. Sleep at an altitude that is lower than the altitude you are at during the day. For example, if you ski
at an elevation of 10,000 feet during the day, sleep the night before and the night after at an elevation of 8,500 feet.
How do I know if I'm getting high-altitude illness?
Some of the first signs of high-altitude illness are headache, lightheadedness, weakness, trouble sleeping and an upset stomach. If you have these symptoms, stop going up or go back down to a lower altitude until your symptoms go away. More severe symptoms include difficulty breathing even while you're resting, coughing, confusion and the inability to walk in a straight line. If you get these symptoms, go to a lower altitude right away and get help from a doctor.
What should I do if I get high-altitude illness?
The best treatment for any of the 3 high-altitude illnesses is to go down to a lower altitude right away. But if you only have mild symptoms, you may be able to stay at that altitude and let your body adjust. If you do this, don't exercise at all--just rest until you feel better. If you have severe symptoms, go down 1,500 to 2,000 feet right away to see if your symptoms get better. Keep going down until your symptoms go away completely. Medicines that may be used to prevent or treat the symptoms of severe high-altitude illness include acetazolamide (one brand name: Diamox) and nifedipine (one brand name: Procardia). Don't ignore signs of high-altitude illness. People can die of this if they don't recognize the signs or if they don't believe their illness is caused by the high altitude. When you have signs of high-altitude illness, don't go higher until you feel better and your symptoms have gone away completely.
Is it safe to go to a high altitude if I have a chronic illness like heart disease or lung disease?
It depends on the type and severity of chronic illness you have. Most people who have a chronic illness, such as heart or lung disease, can safely spend time at a high altitude if their disease is under control. People who have coronary artery disease, mild emphysema or high blood pressure aren't at greater risk of high-altitude illness than people who don't have these diseases. They also don't risk making their disease worse by traveling to a high altitude. In addition, being overweight does not increase the risk of getting high-altitude illness. Some diseases make going to a high altitude very dangerous. People who have sickle cell anemia shouldn't go to a high altitude. A high altitude is also dangerous for people who have severe lung disease, such as chronic obstructive pulmonary disease (COPD) or severe emphysema, and for people who have severe heart disease. If you have a chronic disease, ask your doctor if it's safe for you to travel to a high altitude.
Is going to a high altitude dangerous during pregnancy?
There isn't much information about the risk of high-altitude illness during pregnancy, so it's hard to say if going to a high altitude is safe for pregnant women. Some experts recommend that pregnant women not travel to an altitude above 8,000 feet. If you're pregnant, ask your doctor for advice before you travel to a high altitude.
It's usually safe for children to go to high altitudes, but they're more likely to get high-altitude illness because their bodies have a hard time adjusting to the low oxygen level. A child may not be able to recognize the symptoms of high-altitude illness, so parents and other adults must carefully watch for any signs of high-altitude illness in children.
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