Successful treatment of myxedema coma using levothyroxine and liothyronine in the setting of adrenal crisis and severe cardiogenic shock in a patient with apparent primary empty sella

Abstract

Hypothyroidism is a common pathological condition of thyroid hormone deficiency that varies widely in relation to both the acuity with which the deficiency develops and the clinical manifestations of the disease. While hypothyroidism is commonly mild or even subclinical, one rare complication of hypothyroidism that can cause multiorgan dysfunction is myxedema coma. Myxedema coma is precipitated by an acute stressor such as infection, surgery, or trauma, which disrupts the otherwise compensatory mechanisms present in severe hypothyroidism. Swift diagnosis and treatment of the condition is vital to improving patient outcomes as mortality from myxedema coma ranges from 40 to 60%. The mainstay of treatment includes IV levothyroxine (LT4) with or without the use of liothyronine (LT3). Here we present a case of a patient who presented with presyncope in the setting of generalized fatigue, poor appetite, anhedonia, and slowed speech and movement. Full workup revealed hypotension, hyponatremia, hypoglycemia, respiratory acidosis, undetectable cortisol, free T4, total T4 and an inappropriately normal TSH level. A diagnosis of myxedema coma and adrenal crisis due to pituitary dysfunction was made. A combination of 300 mcg IV LT4 and 5 mcg IV LT3 every 8 hours was used with successful resolution of the patient's symptoms. The patient is currently well maintained on a combination of oral LT4 and hydrocortisone replacement with no further endocrinological complications. This case underscores the need for physicians to maintain a high index of suspicion for secondary adrenal insufficiency and central hypothyroidism in patients with compatible symptoms or risk factors. Furthermore, it also highlights the successful treatment of adrenal crisis and myxedema coma with severe cardiogenic shock with a combination of hydrocortisone, levothyroxine, and liothyronine therapy.