altitude sickness: see decompression sickness decompression sickness, physiological disorder caused by a rapid decrease in atmospheric pressure, resulting in the release of nitrogen bubbles into the body tissues. It is also known as caisson disease, altitude sickness, and the bends.
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altitude sickness

or mountain sickness

Acute reaction to a change from low altitudes to altitudes above 8,000 ft (2,400 m). Most people gradually adapt, but some have a severe reaction that can be fatal unless they return to low altitude. Normal adaptations to the reduced oxygen at high altitude (e.g., breathlessness, racing heartbeat) are exaggerated; other manifestations include headache, gastrointestinal upsets, and weakness. Pulmonary edema is quickly reversed with oxygen and evacuation to a lower area.

altitude sickness [′al·tə‚tüd ‚sik·nəs]

(medicine)

In general, any sickness brought on by exposure to reduced oxygen tension and barometric pressure.

Altitude Sickness

a pathological condition that arises upon ascent to great heights (above 3,000 m) resulting from lowered partial pressure of oxygen in inhaled air. The development of altitude sickness is associated with a disturbance of the function of certain organs and systems, chiefly of the cells of the higher sections of the central nervous system, resulting from oxygen starvation, or hypoxia. At heights under 3,000 m, a healthy person’s oxygen deficiency is compensated for by an increase in pulmonary ventilation (faster and deeper breathing), in blood circulation, and in hemoglobin and erythrocyte count in the blood. Further ascent brings on hypoxia, since the functions of the organism can no longer provide sufficient compensation. A shortage of oxygen in the surrounding air leads to lowered partial pressure of oxygen in the lungs and to lowered oxygen saturation of arterial blood. The major symptoms of altitude sickness include shortness of breath, heart palpitations, dizziness, noise in the ears, headache, nausea, weakness of the muscles, perspiration, blurred vision, sleepiness, and decreased stamina. The symptoms develop in phases, depending on the speed of ascent and on the functional state of the organism. Alcohol, fatigue, and insomnia lower the tolerance for great heights.

Treatments for altitude sickness include descent to a lower altitude, rest, cardiac medicines, and strong tea or coffee. In severe cases, inhalation of oxygen is called for. Inhalation of oxygen from a special apparatus while ascending to great heights prevents altitude sickness. Sports that increase the organism’s demand for oxygen and thus cause hypoxia develop the organism’s resistance to hypoxia. One variant of altitude sickness is mountain sickness. Along with an oxygen deficiency, other factors in mountain sickness are physical exhaustion, cold, and ultraviolet radiation. With acclimatization to the mountain climate, the symptoms of mountain sickness weaken. Relative stabilization of the physiological indexes begins after approximately a three-week stay in the mountains.

N. A. AGADZHANIAN

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No references found	Some of the common symptoms of jet lag include but are not limited to: As mentioned previously, one of the common affect of high altitude sickness is sleep disturbance. Jet Lag and How to Avoid Jet Lag Forever by Trace Cordell / Travel, recreation and leisure community October and November offer prime conditions for trekking and mountaineering in Nepal's spectacular Himalayan peaks, but high altitude sickness and accidents cause annual fatalities. Nepal climbing season claims five French lives by AFP / AFP South Asian Edition	HiFD disk Higan Higashikurume Higashimatsuyama Higashiosaka Higbie model Higden, Ranulf Higgenbotham, A. Leon, Jr. Higgins Higgins project Higgins, Eugene Higgins, George Higgins, Marguerite Higgins, William Higginson, Francis Higginson, Henry L. Higginson, Thomas Wentworth Higgs boson Higgs bosons Higgs field Higgs mechanism Higgs particle high high aloft high altar High altitude sickness High Arctic high availability high bit High bit-rate Digital Subscriber Line high blood pressure high boiler high boost high brass high chair High Church High Cliff State Park high clouds high color high colour High Commission Court High Commission, Court high commissioner high contrast high core High Court High Court of Admiralty high def high definition high density high end	High Altitude Plant Physiology Research Centre High Altitude Plasma Instrument High Altitude Platform High Altitude Platform Station High Altitude Platforms for Communications and Other Services High Altitude Power Loss High Altitude Pulmonary Edema High Altitude Pulmonary Hypertension High Altitude Pulmonary Oedema High Altitude Pulmonary Oedema High Altitude Pulmonary Oedema High Altitude Pulmonary Oedema High Altitude Radar Altimeter High Altitude Reconnaissance Platform High Altitude Reconnaissance Vehicle High Altitude Redesign High Altitude Release Point High Altitude Remote Platform Surveillance System High Altitude Rescue Team High Altitude Research Project High Altitude Research Vehicle High Altitude Reserve Unit High Altitude Resonance Absorption Calculation High Altitude Retinal Hemorrhage High Altitude Route System High Altitude Sampling Program High Altitude Satellite Drag Model High altitude sickness High Altitude SIGINT Architecture High Altitude Sounding Probe High Altitude Space Platform High Altitude Sports Training Complex High Altitude Surface-To-Air Missile High Altitude Surveillance Platform High Altitude Tactical Missile Air Defense High Altitude Theater Missile Defense High Altitude Training Center High Altitude Training Site High Altitude Transition High Altitude Trombone Quartet High Altitude Warfare Experimental Squadron High Altitude Warfare School High Altitude Warfare X High Altitude Water Cherenkov telescope High Altitude, Long Loiter High Altitude-Endurance Aerostat Radar High altitudes High Alumina Cement High Aluminum Defect High Ambient High Amount Lock Out High Amplitude Low Frequency Pulses

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Some of the common symptoms of jet lag include but are not limited to: As mentioned previously, one of the common affect of high altitude sickness is sleep disturbance.

Jet Lag and How to Avoid Jet Lag Forever by Trace Cordell / Travel, recreation and leisure community

October and November offer prime conditions for trekking and mountaineering in Nepal's spectacular Himalayan peaks, but high altitude sickness and accidents cause annual fatalities.

Nepal climbing season claims five French lives by AFP / AFP South Asian Edition

High Altitude Plant Physiology Research Centre
High Altitude Plasma Instrument
High Altitude Platform
High Altitude Platform Station
High Altitude Platforms for Communications and Other Services
High Altitude Power Loss
High Altitude Pulmonary Edema
High Altitude Pulmonary Hypertension
High Altitude Pulmonary Oedema
High Altitude Pulmonary Oedema
High Altitude Pulmonary Oedema
High Altitude Pulmonary Oedema
High Altitude Radar Altimeter
High Altitude Reconnaissance Platform
High Altitude Reconnaissance Vehicle
High Altitude Redesign
High Altitude Release Point
High Altitude Remote Platform Surveillance System
High Altitude Rescue Team
High Altitude Research Project
High Altitude Research Vehicle
High Altitude Reserve Unit
High Altitude Resonance Absorption Calculation
High Altitude Retinal Hemorrhage
High Altitude Route System
High Altitude Sampling Program
High Altitude Satellite Drag Model

High altitude sickness

High Altitude SIGINT Architecture
High Altitude Sounding Probe
High Altitude Space Platform
High Altitude Sports Training Complex
High Altitude Surface-To-Air Missile
High Altitude Surveillance Platform
High Altitude Tactical Missile Air Defense
High Altitude Theater Missile Defense
High Altitude Training Center
High Altitude Training Site
High Altitude Transition
High Altitude Trombone Quartet
High Altitude Warfare Experimental Squadron
High Altitude Warfare School
High Altitude Warfare X
High Altitude Water Cherenkov telescope
High Altitude, Long Loiter
High Altitude-Endurance Aerostat Radar
High altitudes
High Alumina Cement
High Aluminum Defect
High Ambient
High Amount Lock Out
High Amplitude Low Frequency Pulses

Altitude Sickness (redirected from High altitude sickness)

altitude sickness

Altitude Sickness
(redirected from High altitude sickness)