Gaucher disease

Disease Description (Causes and Symptoms)

Altitude sickness (altitude sickness) occurs due to the body’s inadequate adaptation to hypoxia (hypobaric hypoxia) caused by ascent to high altitude. The risk generally increases at altitudes of 2,400 m or higher, and its pathophysiology may progress to cerebral edema (high-altitude cerebral edema, HACE) or pulmonary edema (high-altitude pulmonary edema, HAPE) due to hypoxia-induced hyperventilation, changes in body fluid and blood-flow distribution, and increased vascular permeability. The main symptoms are as follows.

• Early stage (acute mountain sickness, AMS): headache (core symptom), loss of appetite, nausea and vomiting, fatigue and lethargy, sleep disturbance, dizziness, peripheral edema
• Red flags with progression: dyspnea (worsening at rest), cough (frothy or blood-tinged sputum), impaired consciousness, ataxia (staggering while walking), marked behavioral changes — suspect HAPE/HACE
• Diagnostic findings: increased pulse and respiratory rate, decreased oxygen saturation, unstable gait. The Lake Louise scoring system is commonly used to diagnose AMS.

Treatment Methods

General principle: If symptoms appear, the most important measure is to stop ascending immediately and descend as quickly as possible.

1. Conservative treatment (mild to moderate AMS)

   • Rest, stop ascending, and ensure sufficient rest and fluid intake
   • Control headache with analgesics (e.g., ibuprofen, acetaminophen)
   • Relieve symptoms with supplemental oxygen (if possible, such as 2–3 L/min via nasal cannula)
   • Medication: acetazolamide (used for both prevention and treatment)
     • Prevention: usually 125–250 mg every 12 hours (or 250 mg twice daily), starting before departure or before ascending to high altitude
     • Treatment: 250 mg every 12 hours (as directed by a physician)
   • Prohibited/caution: Avoid alcohol and sedatives (sleeping pills, benzodiazepines), as they suppress respiration

2. Severe cases (severe AMS, HACE, HAPE)

   • Descend immediately (if possible, by at least several hundred meters; ideally, descend substantially to a lower elevation)
   • High-concentration oxygen (if possible, oxygen close to 100%). Monitor oxygen saturation and symptoms
   • HACE: dexamethasone (e.g., 4 mg PO/IM q6h) — temporary symptom improvement followed by immediate descent and transfer to a hospital
   • HAPE: use portable oral extended-release nifedipine tablets (e.g., initial 30 mg extended-release, followed by 20 mg q8h) or oxygen and descent. In some situations, potasilic (e.g., sildenafil) may be considered, but it is not standard
   • A portable hyperbaric chamber (e.g., Gamow bag) is useful for relieving symptoms when descent is delayed
   • In an emergency, hospitalization and mechanical ventilation may be required

3. Complications and prognosis

   • With appropriate measures (descent, oxygen, and medication), most people make a full recovery. If untreated, there is a risk of death from HAPE/HACE.
   • Consider preventive medication in cases of repeated high-altitude exposure. A history of severe altitude sickness increases the risk of recurrence.

Outpatient Visit Checklist (Preparation and Example Questions)

Items to bring:

• A list of all medications currently being taken (prescription, nonprescription, and supplements)
• The timing of recent symptom onset and altitude (maximum altitude reached and altitude at symptom onset)
• Hiking and travel itinerary (rate of ascent and scheduled rest days)
• History of altitude sickness, lung disease, cardiovascular disease, or neurological disease
• Recently measured oxygen saturation, if available, body temperature, and records of changes in urine output
• Whether preventive medication is being taken (such as whether acetazolamide has been started)

Data to show the doctor during the outpatient visit:

• Time of symptom onset and the pattern of worsening or improvement
• Activity level (whether strenuous climbing was involved) and sleep status
• Alcohol consumption and smoking status, and whether underlying conditions such as hypertension or asthma are present

Examples of General Questions to Ask the Doctor

• Is this definitely altitude sickness (AMS/HAPE/HACE)? Could there be other causes, such as dehydration or a viral illness?
• What are the expected effects and side effects of the medication I am currently taking (e.g., acetazolamide)?
• By when should I descend, and when should I seek medical care after descending?
• If I have plans for another high-altitude climb, what preventive measures do you recommend?

Examples of Disease-Specific Questions

• Is it safe to remain for several more days at the altitude where I currently have symptoms, or should I descend immediately?
• I have a history of HAPE/HACE. When I climb again, what preventive measures do you recommend in addition to acetazolamide?

Caution: If emergency symptoms occur (severe dyspnea at rest, pink frothy sputum, impaired consciousness, or severe ataxia), immediate first aid, descent, and transfer to a medical institution are required.