A 52-year-old man with a known history of severe alcohol use disorder is brought to the emergency department by emergency medical services after being found confused and wandering in a park. On examination, he is disoriented to time and place, has horizontal nystagmus, and exhibits a wide-based, unsteady gait. He appears malnourished. Arrange the following diagnostic and therapeutic steps in the most appropriate sequential order for the acute management of this patient.
- 1Perform primary assessment of airway, breathing, and circulation, and measure capillary blood glucose.
- 2Administer high-dose intravenous thiamine.
- 3Administer intravenous dextrose-containing fluids.
- 4Obtain a non-contrast computed tomography (CT) scan of the head.
Answer
The correct sequence is: 1) Primary assessment and capillary blood glucose measurement, 2) Intravenous thiamine administration, 3) Intravenous dextrose administration, 4) Non-contrast CT scan of the head.
The patient presents with confusion, ataxia, and nystagmus, which represents the classic clinical triad for Wernicke encephalopathy. The standard sequence of care for any patient with altered mental status begins with the primary assessment (ABCs) and a rapid capillary blood glucose check to rule out immediate life-threatening issues. Because this patient has a severe alcohol use disorder and physical signs of malnutrition and encephalopathy, high-dose intravenous thiamine must be administered next. Thiamine acts as an essential coenzyme in glucose metabolism. Therefore, thiamine must be given prior to intravenous dextrose; otherwise, the glucose load will consume the already depleted thiamine stores, worsening the encephalopathy. Finally, after the patient is metabolically stabilized and empiric therapies are administered, a non-contrast CT scan of the head is indicated to rule out occult traumatic intracranial hemorrhage, which is highly prevalent in patients with chronic alcohol use.
Step-by-Step Solution
Key Concept
In patients with severe alcohol use disorder and altered mental status, acute management requires initial ABC stabilization, followed strictly by intravenous thiamine administration prior to or concurrently with intravenous dextrose, to prevent the precipitation or exacerbation of Wernicke encephalopathy.