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Difficulty: MediumGeneral Internal Medicine

A medical resident is evaluating four different patients admitted to the general internal medicine service. Match each patient's clinical presentation with the most appropriate immediate diagnostic or therapeutic step based on current clinical guidelines.

  • A 72-year-old man with severe COPD presents with increased dyspnea, increased sputum volume, and purulence. His arterial blood gas reveals a pH of 7.26 and a PaCO2 of 68 mmHg.Initiate non-invasive positive pressure ventilation (NIPPV) alongside standard medical therapy.
  • A 24-year-old woman with type 1 diabetes presents with severe nausea, abdominal pain, a blood glucose of 480 mg/dL, and an anion-gap metabolic acidosis.Administer rapid intravenous isotonic fluid resuscitation followed by a continuous regular insulin infusion.
  • A 65-year-old woman presents with fever, productive cough, and a new lobar infiltrate. She is hemodynamically stable, has no recent hospitalizations, and lacks risk factors for MRSA or Pseudomonas.Initiate targeted therapy with a beta-lactam plus a macrolide, avoiding unnecessary broad-spectrum coverage.
  • A 45-year-old man presents with profound fatigue, orthostatic hypotension, hyponatremia, and hyperkalemia. Confirmatory endocrine laboratory testing is drawn and pending.Administer immediate intravenous hydrocortisone without waiting for confirmatory test results.

Answer

The correct matches align each specific clinical syndrome with its most critical guideline-indicated management step: the COPD exacerbation with respiratory acidosis requires NIPPV; the DKA patient requires isotonic fluids and continuous insulin; the uncomplicated CAP patient requires targeted narrow-spectrum antibiotics; and the patient in suspected adrenal crisis requires immediate empiric hydrocortisone.
Each correct pair links a classic internal medicine presentation to its most critical, evidence-based intervention. The COPD patient meets strict criteria for NIPPV due to acute respiratory acidosis. The DKA patient strictly requires fluids and continuous insulin to correct the life-threatening metabolic acidosis. The CAP patient should receive standard empiric therapy based on modern antibiotic stewardship principles. The patient with suspected adrenal crisis requires immediate, empiric hydrocortisone administration.

Step-by-Step Solution

1
Evaluate the patient with COPD and severe hypercapnia.
Identified acute respiratory acidosis (pH 7.26) indicating failure of compensatory mechanisms.
Recognizing respiratory failure confirms the indication for NIPPV, which is proven to reduce mortality.
2
Evaluate the patient with type 1 diabetes and abdominal pain.
Identified diabetic ketoacidosis (DKA) with an anion-gap metabolic acidosis.
Recognizing DKA mandates immediate intravascular volume expansion and suppression of lipolysis/ketogenesis via continuous insulin.
3
Evaluate the patient with stable community-acquired pneumonia.
Identified a lack of specific risk factors for multidrug-resistant organisms.
Adhering to antibiotic stewardship principles prevents the inappropriate use of excessively broad-spectrum antibiotics (e.g., vancomycin/cefepime).
4
Evaluate the hypotensive patient with electrolyte derangements.
Identified the classic triad of hyponatremia, hyperkalemia, and hypotension highly suspicious for an adrenal crisis.
Delaying treatment for confirmatory labs in adrenal crisis significantly increases mortality; therefore, empiric corticosteroids are required immediately.

Key Concept

Acute guideline-based management of internal medicine emergencies, prioritizing stabilization and antibiotic stewardship.
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Topics

General Internal Medicine

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