A 38-year-old woman is evaluated in the surgical intensive care unit on postoperative day … — USMLE Step 2 CK

A 38-year-old woman is evaluated in the surgical intensive care unit on postoperative day 1 following an elective restorative proctocolectomy with ileal pouch-anal anastomosis for medically refractory ulcerative colitis. Her past medical history is significant for severe ulcerative colitis managed with high-dose oral prednisone for the past 8 months. The prednisone was tapered and completely discontinued 2 weeks prior to surgery due to the planned curative procedure.

Current vital signs are temperature 39.2°C (102.6°F), blood pressure 74/42 mm Hg, heart rate 126/min, and respiratory rate 22/min. Physical examination reveals a lethargic, somnolent patient. The abdomen is diffusely tender to deep palpation but remains soft, with no guarding, rebound, or rigidity. The surgical incision is clean, dry, and intact.

Laboratory studies show:

Laboratory Test	Result	Reference Range
Sodium	131 mEq/L	136-145 mEq/L
Potassium	5.6 mEq/L	3.5-5.0 mEq/L
Chloride	98 mEq/L	98-106 mEq/L
Bicarbonate	20 mEq/L	22-28 mEq/L
Blood urea nitrogen	24 mg/dL	8-20 mg/dL
Creatinine	1.1 mg/dL	0.6-1.2 mg/dL
Glucose	56 mg/dL	70-110 mg/dL
Leukocytes	11,500/mm³	4,500-11,000/mm³

Which of the following is the most appropriate next step in management?

Intravenous administration of hydrocortisoneAnswer
B
Computed tomography scan of the abdomen and pelvis
C
Immediate return to the operating room
D
Initiation of broad-spectrum intravenous antibiotics
E
Intravenous administration of a continuous norepinephrine infusion

Answer

Intravenous administration of hydrocortisone

The correct answer is the intravenous administration of hydrocortisone. This patient has a history of long-term prednisone use (8 months) for ulcerative colitis, which profoundly suppresses the hypothalamic-pituitary-adrenal (HPA) axis. Although the medication was discontinued 2 weeks prior to surgery, complete HPA axis recovery can take up to 6 to 12 months. The severe physiological stress of a major operation significantly increases the body's demand for cortisol. Without adequate endogenous cortisol production or the administration of exogenous 'stress-dose' perioperative steroids, the patient rapidly develops an acute adrenal crisis. This life-threatening condition is characterized by severe distributive shock (hypotension and tachycardia that is refractory to fluids), high fever, lethargy, and a classic metabolic triad: hyponatremia, hyperkalemia, and hypoglycemia. The definitive and immediate treatment is the intravenous administration of glucocorticoids (e.g., hydrocortisone or dexamethasone) alongside vigorous intravenous fluid resuscitation.

Step-by-Step Solution

Analyze the patient's preoperative medical and medication history.

The patient used high-dose systemic corticosteroids for 8 months and discontinued them only 2 weeks prior to surgery, placing her at extremely high risk for hypothalamic-pituitary-adrenal (HPA) axis suppression.

Prolonged exogenous steroid use inhibits endogenous CRH and ACTH production. HPA axis recovery can take 6 to 12 months after cessation.

Evaluate the acute postoperative clinical presentation and laboratory findings.

The patient presents with severe distributive shock (hypotension, tachycardia), high fever, lethargy, and a metabolic triad of hyponatremia, hyperkalemia, and hypoglycemia on postoperative day 1.

The physiological stress of major surgery drastically increases the body's demand for cortisol. Without adequate endogenous production, acute adrenal crisis ensues, presenting with shock and characteristic mineralocorticoid/glucocorticoid deficiency lab patterns.

Determine the most critical, life-saving next step in management.

The immediate administration of intravenous glucocorticoids (such as hydrocortisone or dexamethasone) along with vigorous intravenous fluid resuscitation is required.

Definitive replacement of the missing cortisol rapidly reverses the shock, as vasopressors are largely ineffective in the absence of permissive glucocorticoid effects.

Key Concept

Patients with prolonged exposure to systemic corticosteroids are at high risk for secondary adrenal insufficiency and can develop a life-threatening acute adrenal crisis during the physiological stress of surgery if stress-dose steroids are not administered.

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