Heterotopic ossification

Disease Description (Causes and Symptoms)

• Definition and pathophysiology: The adrenal glands (one on each side above the kidneys) secrete glucocorticoids (cortisol), mineralocorticoids (aldosterone), and androgens. Adrenal insufficiency occurs when the secretion of cortisol and/or aldosterone decreases, in particular.
  • Primary (adrenal, Addison-type): ACTH increases due to damage to the adrenal cortex itself. Causes include autoimmune disease (most common), tuberculosis, fungal infections, metastatic cancer, hemorrhage, and genetic diseases. Hyponatremia, hyperkalemia, and hypotension due to hypoaldosteronism are characteristic, and pigmentation of the skin and mucous membranes (increased melanin) may occur.
  • Secondary (central): Occurs due to abnormalities of the pituitary gland/hypothalamus or after long-term use of exogenous steroids. Aldosterone is mainly regulated by the renin-angiotensin system, so electrolyte abnormalities are relatively less pronounced.
• Main symptoms: Chronic fatigue and malaise, weight loss, decreased appetite, nausea, vomiting, abdominal pain, hypotension (orthostatic hypotension), hypoglycemia, muscle weakness, decreased body hair, salt craving, pigmentation of the skin and mucous membranes (primary), and, in severe cases, impaired consciousness and shock (adrenal crisis).

Treatment Methods and Precautions

• Key diagnostic tests (summary): Morning (08:00) serum cortisol, blood ACTH, electrolytes (Na, K), evening- and sleep-related tests if needed, standard ACTH (corticotropin) stimulation test (short-term/low-dose), renin and aldosterone, adrenal CT or pituitary MRI (when secondary adrenal insufficiency is suspected).
• Drug treatment (standard and representative regimens):
  • Chronic replacement therapy (primary and secondary):
    • Glucocorticoid: Hydrocortisone 15–25 mg/day (e.g., 10 mg in the morning, 5 mg in the afternoon, and 5–10 mg in the early evening) or prednisolone 3–5 mg/day, etc. Adjust according to individual symptoms and body weight.
    • Mineralocorticoid (needed in primary adrenal insufficiency): Fludrocortisone 0.05–0.2 mg/day (adjusted based on blood pressure, electrolytes, and renin levels).
  • Acute adrenal crisis (emergency):
    • Immediately administer intravenous hydrocortisone 100 mg as a bolus, followed by 50–100 mg every 6–8 hours or a continuous infusion of 200 mg/24 hours. Large-volume fluids (normal saline), glucose (in case of hypoglycemia), correction of electrolytes, and treatment of the cause (such as infection).
• Drug interactions and precautions:
  • Strong hepatic enzyme-inducing drugs such as rifampin, phenytoin, and carbamazepine promote steroid metabolism and may require dose increases. If a specific medication is indicated, consult the attending physician.
  • Monitor for osteopenia, increased risk of infection, elevated blood glucose, and other issues during long-term glucocorticoid use.
  • Patients with primary adrenal insufficiency require mineralocorticoid supplementation and monitoring of fluid status and electrolytes.
• Self-management and emergency response:
  • “Sick-day rules”: Temporarily increase the glucocorticoid dose 2–3 times during stress such as fever, infection, surgery, or vomiting (if oral administration is possible). If vomiting persists or oral intake is impossible, administer immediately by intravenous or intramuscular injection.
  • An emergency IM hydrocortisone injection kit and wearing a steroid emergency card/medical ID are recommended.
• Complications: Adrenal crisis (hypotension, shock, hypoglycemia), electrolyte abnormalities (hyperkalemia, hyponatremia), cardiovascular problems, worsening infection, and chronic steroid adverse effects (osteoporosis, diabetes, etc.).

Checklist Before an Outpatient Visit (Including Preparation Items and Sample Questions)

• List of items to prepare:
  • A list of all medications currently being taken (including steroid preparations), along with doses and administration times (if possible, bring photos of the medication bottles or prescriptions).
  • Recent blood pressure and weight records (especially orthostatic blood pressure measurements if orthostatic symptoms are present).
  • Recent test results (electrolytes, cortisol and ACTH, ACTH stimulation test results, blood glucose, etc.) or copies of test results received from a medical institution.
  • Past medical history (tuberculosis, pituitary disease, history of long-term steroid use, surgical history).
  • A symptom diary (the timing and severity of fatigue, vomiting, appetite changes, dizziness, pigmentation, etc.).
• Information helpful to provide to the doctor during the outpatient visit:
  • Changes in symptoms (new or worsening symptoms), recent stressful events such as infection, surgery, or trauma, and changes in medications being taken.
• Simple examples of questions to prepare for the outpatient visit:
  • Is the dose of the steroid I am currently taking appropriate?
  • How do I use the emergency steroid injection kit?

General Examples of Questions to Ask the Doctor

• What are the common side effects and long-term monitoring items for this medication (hydrocortisone/fludrocortisone)?
• How specifically should I increase the medication during stressful situations such as infection or surgery? (When should I go to a medical institution?)
• Which medications require caution because of drug interactions (e.g., antituberculosis drugs, antiepileptic drugs)?
• What is the long-term prognosis, and what tests should I undergo regularly?

Examples of Disease-Specific Questions

• If it is primary adrenal insufficiency (a problem with the adrenal glands themselves): “According to what criteria (blood pressure, sodium, and renin levels) should fludrocortisone be adjusted?”
• When acute symptoms (vomiting, dehydration, impaired consciousness, etc.) occur: “Could you explain how to administer an IM hydrocortisone injection at home in an emergency and the criteria for administering it? When should I go directly to the emergency room?”