Emergency Intramuscular Hydrocortisone for Adrenal Crisis

Indications for Immediate IM Injection

• Patients with adrenal insufficiency should inject 100 mg of hydrocortisone intramuscularly at the first sign of an adrenal crisis—such as persistent vomiting or diarrhea that prevents oral medication, systolic blood pressure < 100 mm Hg, severe physical stress (major trauma, fever ≥ 39 °C, or shock‑like symptoms)—and then call emergency services. 1
• The injection must be given without waiting for laboratory confirmation or attempting to contact the endocrinologist first, because delay can be life‑threatening. 1

Immediate Post‑Injection Management

• After self‑administration, call emergency medical services immediately and inform them of the adrenal insufficiency and the dose given. 1
• Patients should be transported to an emergency department even if symptoms improve; they will require IV fluid resuscitation (≈ 1 L of saline in the first hour) and continuous IV hydrocortisone (total 200 mg over 24 h or 50 mg every 6 h) to prevent recurrence of crisis. 1

Injection Technique Considerations

• Use a needle at least 1 inch (25 mm) long for adults to ensure true intramuscular delivery; shorter needles risk sub‑cutaneous administration and slower drug absorption. 1
• Preferred injection sites are the vastus lateralis (outer thigh) or the ventrogluteal (upper outer buttock); the dorsogluteal (upper inner buttock) site should be avoided because of a higher risk of sciatic nerve injury. 1

Risks of Delayed or Improper Administration

• Delaying the injection while trying to reach a physician or waiting for symptom improvement can allow adrenal crisis to progress to shock and death within hours. 1
• Using an inadequate needle length or injecting into the dorsogluteal site increases the chance of ineffective drug delivery or nerve injury, respectively. 1
• Failing to call for emergency transport after the IM dose leaves the patient vulnerable, as the single dose only buys time and does not replace the need for hospital‑level IV therapy. 1

Criteria and Management of Adrenal Crisis

Definition and Diagnostic Thresholds

• Adrenal crisis is defined as a major health impairment accompanied by at least two of the following signs or symptoms: hypotension (systolic < 100 mmHg), nausea/vomiting, severe fatigue, fever, somnolence, hyponatremia (< 132 mmol/L) or hyperkalemia, and hypoglycemia. 2
• The specific blood‑pressure threshold for crisis is a systolic pressure < 100 mmHg. 2

Indications for Emergency Hydrocortisone

• Emergency IV hydrocortisone (100 mg) is indicated when any of the following are present:

Emergency Treatment Regimen

This regimen is recommended for the acute management of adrenal crisis. 3

Stress‑Dose Adjustments for Mild Illness

• For low‑grade fever (~38 °C), double the usual oral hydrocortisone dose.
• For high‑grade fever (≥ 39 °C), triple the usual oral dose.
• Maintain the increased dose for 2–3 days until the patient recovers. 3

Immediate Actions When Oral Intake Is Not Possible

• Administer 100 mg hydrocortisone IM or SC immediately from an emergency kit.
• Arrange prompt transport to an emergency department for further care. 2, 3

Clinical Decision Guidance

• Do not delay treatment while awaiting laboratory confirmation; the presence of clinical criteria alone warrants immediate therapy. 3

Stress‑Dose Glucocorticoid Management for Patients with Addison’s Disease Undergoing Blood Transfusion

Pre‑Transfusion Steroid Coverage

• Hospitalized or high‑risk transfusions: Administer 100 mg hydrocortisone intravenously immediately before or at the start of the blood transfusion to provide adequate glucocorticoid coverage for the physiological stress of the procedure. 4
• Uncomplicated outpatient transfusions: Double the usual oral hydrocortisone dose (e.g., from 15–25 mg/day to 30–50 mg/day) on the day of transfusion and maintain the increased dose for 24–48 hours to prevent adrenal crisis. 4
• Fever‑triggered dose escalation: If the patient develops a fever ≥ 38 °C during or after transfusion, double the hydrocortisone dose; if fever reaches ≥ 39 °C, triple the dose to match the heightened stress response. 4

Management of Transfusion‑Related Adrenal Crisis

• Immediate response to hypotension or shock: Stop the transfusion, give a 100 mg IV bolus of hydrocortisone without awaiting laboratory confirmation, and rapidly infuse 1 L isotonic saline over the first hour. Follow with continuous IV hydrocortisone 200 mg over 24 hours (or 50 mg IV every 6 hours). 4
• Allergic or anaphylactoid reactions: Recognize that such reactions can precipitate rapid cardiovascular collapse in patients lacking endogenous cortisol; ensure stress‑dose hydrocortisone is administered promptly. 4
• Volume overload considerations: Be aware that patients with aldosterone deficiency may poorly tolerate transfusion‑related volume shifts, increasing the risk of decompensation. 4

Patient Education and Documentation

• Written instructions for dose adjustment: Provide patients with clear written guidance to double or triple their oral hydrocortisone dose if fever or gastrointestinal symptoms develop after transfusion. 4
• Transfusion order documentation: Explicitly note in the transfusion order that the patient has primary adrenal insufficiency and requires stress‑dose steroid coverage. [5][4]

Monitoring and Post‑Transfusion Care

• Temperature surveillance: Check the patient’s temperature hourly; any fever ≥ 38 °C triggers an immediate increase in glucocorticoid dosing. 4
• Post‑transfusion steroid continuation: Maintain the doubled hydrocortisone dose for 24–48 hours after the transfusion to cover the ongoing inflammatory response. 4

Critical Considerations

• Avoid delay for specialist consultation: Do not wait for endocrinology input before administering IV hydrocortisone in a hypotensive patient with Addison’s disease; immediate treatment is essential to prevent fatal adrenal crisis. 4

All cited facts are derived from peer‑reviewed sources (Anaesthesia 2020; The Journal of Clinical Endocrinology & Metabolism 2016). Evidence level was not explicitly graded in the source material.