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Tips about AMS

What is Acute Mountain Sickness (AMS)?
 
Acute Mountain Sickness is common at high altitudes, and depends on the elevation, the rate of ascent and individual susceptibility. Most visitors to Tibet will suffer from at least some symptoms that will generally disappear through acclimatization in several hours to several days. Symptoms tend to be worse at night and include headache, dizziness, and lethargy, loss of appetite, nausea, breathlessness and irritability. Difficulty sleeping is another common symptom, and many travelers have trouble sleeping for the first few days after arriving in Lhasa. The high altitude and people's reaction to it is one of the difficulties to travel to Tibet. But it is not as serious as you imagined if you know it and get prepared for it.
 
What is High Altitude?

- High Altitude: 1500 - 3500 m (5000 - 11500 ft)
- Very High Altitude: 3500 - 5500 m (11500 - 18000 ft)
- Extreme Altitude: above 5500 m
 

 Place
Altitude
Place
Altitude
3658 m
12001 ft
3000 m
9843 ft
4507 m
14787 ft
Tsedang
3500 m
11483 ft
Qamdo
3205 m
10515 ft
Xigatse
3836 m
12585 ft
Damshung
4200 m
13780 ft
Gyangtse
4040 m
13255 ft
Pome
2750 m
9022 ft
Tingri
4300 m
14108 ft
Amdo
4800 m
15748 ft
Zayui
2325 m

 
When acclimatization lags significantly behind ascent, various symptoms occur. Acute Mountain Sickness (AMS) represents the body's intolerance of the hypoxic (low oxygen) environment at one's current elevation
 
What kinds of physiologic reactions will occur?

- Hyperventilation (breathing fast)
- Shortness of breath during exertion
- Increased urination
- Changed breathing pattern at night
- Awakening frequently at night
- Weird dreams

Tips to avoid AMS
 
  • Stop doing exercises at least one week before coming to Tibet.
  • Avoid catching cold before you entering Tibet and after arrival.
  • Make sure you have a good sleep the night before you flying to Lhasa.
  • You'd better not to take any activities for the first day in Tibet.
  • After getting off your airplane in the airport, walk slowly, take some deep breath. Don't push yourself when climbing up to passes, rather take plenty of breaks. Ascend to higher altitude gradually. Do not ascend any higher if you feel bad.
  • Drink extra fluids. The mountain air is dry and cold and moisture is lost as you breathe. Evaporation of sweat may occur unnoticed and result in dehydration.
  • Eat light, high-carbohydrate meals for more energy.
  • Prepare some AMS pills according to your doctor's suggestion and avoid sedatives.
  • Avoid sedatives.
  • Avoid alcohol as it may increase the risk of dehydration, and don't smoke.
 
Who can't go?
 
Chinayak may suggest clients who suffered from high blood pressure and severe heart disease not travel to Tibet.
 
How can I prevent high-altitude illness?
 
First 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.
Other important tips are 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.
 
What about children and high altitudes?
 
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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