General Information
DEFINITION--
Any of several illnesses associated with higher than usual altitudes. Illnesses are of
several types, including:
- Acute mountain sickness (AMS).
- High altitude pulmonary edema (HAPE).
- High altitude cerebral edema (HACE).
- High altitude retinal hemorrhage (HARH).
- Subacute and chronic mountain sickness (CMS). This illness is a complication that
represents failure to recover from AMS over a long period of time.
BODY PARTS INVOLVED--These illnesses affect most body systems, especially the
brain, heart, lungs, gastrointestinal tract, circulatory system and electrolytes. SEX AND
AGE MOST AFFECTED--Young adults of both sexes.
SIGNS & SYMPTOMS
> AMS: headache, nausea, vomiting, shortness of breath, sleep disturbances.
> HAPE: shortness of breath, cough, weakness, headache, coma.
> HACE: severe headache, staggering gait, hallucinations, stupor. These indicate
swelling of the brain. Death will occur with descent.
> HARH: visual disturbances, including spots before the eyes. Blood clots and
bleeding into the retina occur in 50% of those who go above 17,000 feet.
> CMS: shortness of breath, fatigue, bloated face and body, congestive heart failure
after years of living at high altitude (rare).
CAUSES--
Insufficient oxygen at high altitudes. Following are the altitudes at which each type
of illness can occur:
- AMS--7,000 to 8,000 feet or higher.
- HAPE--9,000 to 10,000 feet.
- HACE--10,000 to 12,000 feet.
- HARH--17,000 feet.
RISK INCREASES WITH
- Lack of conditioning.
- Faster and higher ascent.
- Previous episodes of altitude illness.
- Chronic illness of any sort, particularly cardiovascular and lung diseases.
- Excess alcohol consumption or use of mind-altering drugs, including narcotics and
tranquilizers.
HOW TO PREVENT
- Acclimatization as you ascend; descend if troubling symptoms appear.
- Obtain maximum physical conditioning.
- Talk to your doctor about preventive drugs.
What To Expect
DIAGNOSTIC MEASURES--
- Medical history and physical exam by a doctor.
- Laboratory blood studies and urinalysis.
- ECG (See Glossary) and chest x-rays (sometimes).
APPROPRIATE HEALTH CARE
- Self-care.
- Doctor's treatment.
- Hospitalization (severe cases).
POSSIBLE COMPLICATIONS--Respiratory distress syndrome; brain, eye, heart and
lung damage.
PROBABLE OUTCOME--Complete recovery in 1-3 days.
How To Treat
GENERAL MEASURES--
- In most cases, rest, mild pain relievers, avoidance of alcohol and adequate hydration
will control symptoms.
- For some patients, a descent to a lower altitude will be necessary.
MEDICATION--Your doctor may prescribe:
- Pain relievers for headache.
- Antibiotics if infection is present.
- Dexamethasone or acetazolamide for more severe symptoms.
- Supplemental oxygen if required.
ACTIVITY--
- If any altitude illness occurs, decrease activity to a level at which symptoms
disappear.
- Resume routine activities gradually upon returning to normal altitude.
DIET--Increase fluid intake, avoid alcohol, eat small meals.
Call Your Doctor If
- You have symptoms of any altitude illness.
- New, unexplained symptoms develop. Drugs used in treatment may produce side effects.
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