The Endocrine System in Emergency Medicine
While diabetic emergencies dominate endocrine-related EMS education, the endocrine system encompasses multiple glands that can produce life-threatening emergencies. The thyroid gland, adrenal glands, and pituitary gland all regulate critical body functions, and dysfunction of any of these can cause acute, life-threatening presentations. Recognizing these conditions requires understanding their pathophysiology and typical presentations.
Endocrine emergencies often present with nonspecific symptoms that mimic other conditions: altered mental status, cardiovascular instability, and metabolic derangements. The key to identifying them is maintaining a broad differential diagnosis and asking about endocrine medical history and medications during your SAMPLE history.
Thyroid Emergencies
Thyroid Storm (Thyrotoxic Crisis)
Thyroid storm is a life-threatening exacerbation of hyperthyroidism. It typically occurs in patients with known hyperthyroidism (Graves' disease) who experience a precipitating event such as infection, surgery, trauma, or medication noncompliance. The presentation includes extremely high fever (often above 104 degrees F), severe tachycardia (heart rates above 140 are common), agitation or delirium, diaphoresis, nausea, vomiting, and diarrhea. Atrial fibrillation and heart failure may develop. Without treatment, thyroid storm can progress to cardiovascular collapse and death.
Prehospital management focuses on supportive care: cooling measures for hyperthermia, IV fluid resuscitation for dehydration, cardiac monitoring, and rapid transport. Document any thyroid medications the patient takes.
Myxedema Coma
Myxedema coma is the most severe form of hypothyroidism and is the opposite of thyroid storm. It typically develops in elderly patients with untreated or undertreated hypothyroidism who encounter a physiological stressor. Patients present with hypothermia (sometimes profoundly low temperatures), bradycardia, hypotension, hypoventilation, altered mental status progressing to coma, and generalized edema with a characteristic puffy face. Mortality rates exceed 50% even with treatment. Prehospital management includes gentle rewarming (aggressive rewarming can trigger cardiac arrest), airway management, ventilatory support, and rapid transport.
Adrenal Crisis
Adrenal crisis (acute adrenal insufficiency) occurs when the adrenal glands cannot produce enough cortisol to meet the body's demands. It most commonly affects patients who take chronic corticosteroids (prednisone, hydrocortisone) and either abruptly stop their medication or experience a physiological stress (illness, injury, surgery) that exceeds their adrenal capacity. Patients present with profound hypotension refractory to fluid resuscitation, weakness, abdominal pain, nausea, vomiting, and altered mental status. Hypoglycemia and hyperkalemia may also be present.
Prehospital Recognition and Management
The key to recognizing these endocrine emergencies in the field is asking about endocrine conditions and medications. Patients who take thyroid medications, corticosteroids, or have a history of thyroid disease, Addison's disease, or pituitary disorders are at risk. When you encounter a patient with cardiovascular instability and altered mental status that does not fit a common pattern, consider endocrine causes. Management in the field is primarily supportive: airway management, hemodynamic support with fluids, temperature management, and rapid transport with a detailed report to the receiving facility that includes the patient's endocrine history and medications.