The Altitude

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Also referred to as "Altitude Sickness" and as this name indicates, the illnesses is commonly encountered at exceptional high altitudes, such as the summit area of Mount Kilimanjaro. AMS, once apparent, can be most effectively treated by immediately taking the affected person to a lower altitude. Often a drop as little as 500m will be sufficient. The symptoms of AMS include in the order normally experienced; headaches, nausea, anorexia, exhaustion, lassitude, rapid pulse, insomnia, swelling of the hands and feet and reduced urine output. Climbers can take precautions to at least minimise the severity of the illness, by maintaining a slow steady pace from day one, include an extra day of acclimatisation at a high altitude and by drinking at least 3-4 liters of water every day. Preventative medicine is also available and you should consult your physician for specialist advice. Fluid build-up may cause a condition known as edema, which can affect the lungs (pulmonary), preventing effective oxygen exchange, or effect the brain (cerebral) which will result in the swelling of the brain tissue. The latter can be lethal if not treated immediately or if symptoms are ignored. Probably 70% of all people climbing Kilimanjaro will suffer to some extent from AMS. You should familiarise yourself with this condition and take preventative care.

The concentration of oxygen at sea level is about 21% and the barometric pressure averages 760 mmHg. As altitude increases, the concentration remains the same but the number of oxygen molecules per breath is reduced. At 12,000 feet (3,658 meters) the barometric pressure is only 483 mmHg, so there are roughly 40% fewer oxygen molecules per breath. In order to properly oxygenate the body, your breathing rate (even while at rest) has to increase. This extra ventilation increases the oxygen content in the blood, but not to sea level concentrations. Since the amount of oxygen required for activity is the same, the body must adjust to having less oxygen. In addition, for reasons not entirely understood, high altitude and lower air pressure causes fluid to leak from the capillaries which can cause fluid build-up in both the lungs and the brain. Continuing to higher altitudes without proper acclimatization can lead to potentially serious, even life-threatening illnesses.

The major cause of altitude illnesses is going too high too fast. Given time, your body can adapt to the decrease in oxygen molecules at a specific altitude. This process is known as acclimatization and generally takes 1-3 days at that altitude. For example, if you hike to 10,000 feet (3,048 meters), and spend several days at that altitude, your body acclimatizes to 10,000 feet (3,048 meters). If you climb to 12,000 feet (3,658 meters), your body has to acclimatize once again. A number of changes take place in the body to allow it to operate with decreased oxygen.

- The depth of respiration increases.

- Pressure in pulmonary arteries is increased, "forcing" blood into portions of the lung which are normally not used during sea level breathing.

- The body produces more red blood cells to carry oxygen,

- The body produces more of a particular enzyme that facilitates

- The release of oxygen from hemoglobin to the body tissues.

Final Amount: £22,000