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ALTITUDE ILLNESS

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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