Medical Glossary

This glossary contains:
19186
medical terms

Altitude, acclimatization to



Altitude, acclimatization to

Adjustment to changes in altitude. The main cause of altitude sickness is going too high too fast. Given time, the body can adapt to the decrease in oxygen concentration at a specific altitude, process known as acclimatization.

RELATED TERMS
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Oxygen
A chemical element essential for sustaining life.



SIMILAR TERMS
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Altitude illness
"Altitude illness (or altitude sickness) is a disorder caused by being at high altitude. It commonly occurs above 8,000 feet (2,440 meters). The cause of altitude illness is a matter of oxygen physiology. At sea level the concentration of oxygen 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 oxygenate the body effectively, 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, high altitude and lower air pressure cause 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.

Altitude sickness
A potentially fatal illness caused by being at altitudes high enough to reduce the amount of oxygen available to the body.

Altitude, high
Altitude sickness occurs at high altitude.



PREVIOUS AND NEXT TERMS
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Alternating hemiplegia syndrome
See: Alternating hemiplegia of childhood.

Alternative medical system
A system of alternative medicine built upon a complete system of theory and practice. Often, such systems have evolved apart from and earlier than the conventional medical approach used in the US or Europe. Alternative medical systems may have evolved in Western or non-Western cultures. Examples of alternative medical systems that have developed in Western cultures include homeopathic medicine and naturopathic medicine. Examples of systems that have developed in non-Western cultures include traditional Chinese medicine and Ayurveda.

Alternative splicing
A mechanism by which different forms of mature mRNAs (messengers RNAs) are generated from the same gene. Alternative splicing is a regulatory mechanism by which variations in the incorporation of the exons, or coding regions, into mRNA leads to the production of more than one related protein, or isoform.

Altitude illness
"Altitude illness (or altitude sickness) is a disorder caused by being at high altitude. It commonly occurs above 8,000 feet (2,440 meters). The cause of altitude illness is a matter of oxygen physiology. At sea level the concentration of oxygen 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 oxygenate the body effectively, 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, high altitude and lower air pressure cause 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.

Altitude, acclimatization to

Altitude, high
Altitude sickness occurs at high altitude.

Altretamine
Brand name: Hexalen. An oral drug used to treat ovarian cancer that has persisted or has recurred following treatment with other anti-cancer drugs. It was approved for this use by the FDA in 1990. Altretamine also has been used for treating lung cancer, although this is an off-label use.

Aluminum poisoning
See: Aluminum.

Aluminum toxicity
See: Aluminum.

Alveolar
"Pertaining to the alveoli, the tiny air sacs in the lungs. The exchange of oxygen and carbon dioxide takes place in the alveoli which look like cells in a honeycomb. The word comes from the Latin diminutive of ""alveus"" meaning a cavity or hollow = a little cavity or hollow."

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This dictionary contains 19186 terms.


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