by Dr. Theresa A.V. Donati
It is winter in the mountains and friends and relatives from low altitude will descend upon our area. As they travel to higher altitudes, we need to be familiar with the signs, symptoms and treatment of high-altitude illness.
Every year the western U.S. attracts 30 million visitors to sleep at elevations ranging from 6,500 to 9,800 feet. Millions more visit high-altitude cities around the world, and most of those destinations can be reached within a day. We all know climbers, trekkers and skiers who climb to elevations up to 13,000 feet, often without time to acclimatize. We can all be of help if we know the signs, symptoms and treatments of high-altitude illnesses.
It is possible to prevent serious effects of high-altitude illness by ascending slowly and allowing the body to adjust. If your friends or relatives have never been to a high-altitude location like many places in Colorado, it’s not possible to know in advance if they will become ill. However, certain groups of people are more prone to developing high-altitude illness, including those with a prior history of the illness; those who drink alcohol before the altitude change; those who ascend rapidly; and people with medical problems that affect breathing.
Colorado visitors should also know that certain medical conditions need special attention at higher altitudes. Anyone with a history of heart attack or heart disease who develops chest pain, shortness of breath or dizziness should seek medical attention immediately. A person who uses oxygen may need a higher flow rate at high altitude, or someone with lung disease who doesn’t use oxygen at sea level may need it here. And anyone with sickle-cell disease will probably need oxygen above 7,000 feet. Surprisingly, though, asthma does not become worse at high altitudes.
Acute mountain sickness, or AMS, is the most common of the high-altitude illnesses. About 50 percent of people who live at low altitude will develop this condition when they sleep above 10,000 feet. Symptoms include headache, fatigue, light-headedness, lack of appetite, waking frequently during the night, and nausea and sometimes vomiting. The symptoms can be mild or severe, and they usually improve after the first night if the person stays at altitude, but may return if he continues to climb higher.
To avoid AMS, ascend slowly and do the following:
• If you live below 5,000 feet, don’t sleep above 9,000 feet the first night.
• If your travel plans have you going above 10,000 feet, ascend only 1,500 feet per day. Rest a day at one altitude for every 3,000 feet you climb.
• If you are backpacking, cross high passes during the day but descend to lower altitudes to sleep.
• Don’t drink alcohol or use sleeping pills, and don’t overexert yourself during the first few days at altitude.
• Caffeine is safe at high altitudes, so if you’re a regular consumer, don’t stop — abstaining from caffeine suddenly can cause the same symptoms as AMS.
If you develop AMS, treatments include acetaminophen or ibuprofen for headaches; prescription drugs for nausea or vomiting; oxygen; and, especially, descending to a lower altitude, usually dropping down by 1,500 to 3,000 feet.
Other, more serious, altitude sicknesses include high-altitude cerebral edema which can causes severe headache and lethargy or confusion, and high-altitude pulmonary edema which causes sudden severe shortness of breath. These conditions require immediate attention and treatment by a physician.
So, the next time you have visitors from New York or Chicago — or from much of the rest of the country which is at lower altitudes — advise them to take it easy for a few days before heading to the top of Pikes Peak or Mount Evans. The view is great, but the hazards of rapid ascents shouldn’t be ignored.
Dr. Theresa A.V. Donati is on the staff at New West Physicians’ Evergreen office.
|