An internal medicine clinical pathways committee is updating hospital protocols for the ac… — USMLE Step 2 CK

An internal medicine clinical pathways committee is updating hospital protocols for the acute management of oncologic complications. Match each of the following patient presentations—characterized by specific clinical signs, symptoms, and targeted laboratory data—to the single most appropriate initial therapeutic intervention according to current clinical guidelines.

A 69-year-old man with metastatic prostate cancer who presents with rapidly progressive bilateral lower extremity weakness, a distinct sensory deficit below the umbilicus, and new-onset urinary retention.Immediate administration of high-dose intravenous glucocorticoids
A 41-year-old woman undergoing induction chemotherapy for acute myeloid leukemia who develops oliguria, an electrocardiogram demonstrating peaked T waves, and laboratory studies revealing severe hyperuricemia and low serum calcium.Continuous telemetry, aggressive isotonic fluid resuscitation, and administration of rasburicase
A 61-year-old woman with advanced breast cancer who presents with profound lethargy, severe constipation, an abbreviated QT interval on electrocardiography, and a serum calcium level of $14.6\text{ mg/dL}$ .Rapid volume expansion with intravenous $0.9\%$ saline and subsequent administration of zoledronic acid
A 54-year-old man receiving systemic chemotherapy who presents with a temperature of $39.4^\circ\text{C}$ ( $102.9^\circ\text{F}$ ), no focal infectious symptoms on examination, and an absolute neutrophil count of $300/\mu\text{L}$ .Immediate procurement of blood cultures followed by prompt initiation of an antipseudomonal beta-lactam

Answer

The correct matches pair each oncologic emergency with its definitive initial management: malignant spinal cord compression requires immediate glucocorticoids; tumor lysis syndrome requires fluids and rasburicase; severe hypercalcemia requires aggressive saline followed by bisphosphonates; and febrile neutropenia requires immediate empiric antipseudomonal antibiotics.

The correct matches represent the consensus guidelines for acute oncologic emergencies. Suspected malignant spinal cord compression necessitates immediate corticosteroids to mitigate permanent neurologic damage. Tumor lysis syndrome requires vigorous hydration and rasburicase to address hyperuricemia and preserve renal function. Severe hypercalcemia requires initial aggressive isotonic saline to correct profound volume depletion before bisphosphonates take effect. Febrile neutropenia demands immediate blood cultures and the empiric initiation of an antipseudomonal beta-lactam to prevent fulminant sepsis.

Step-by-Step Solution

Analyze the first clinical presentation featuring progressive lower extremity weakness, a sensory level, and urinary retention in a patient with prostate cancer.

Identify the condition as malignant spinal cord compression (MSCC).

These findings represent a neurologic emergency requiring immediate intervention to prevent irreversible paralysis.

Determine the initial pharmacological step for malignant spinal cord compression.

Match with 'Immediate administration of high-dose intravenous glucocorticoids'.

Corticosteroids rapidly decrease spinal cord edema, relieving pressure while awaiting definitive imaging (MRI) and surgical or radiotherapeutic management.

Analyze the second presentation involving oliguria, peaked T waves, hyperuricemia, and hypocalcemia following chemotherapy.

Identify the condition as tumor lysis syndrome (TLS).

Massive tumor cell death releases intracellular contents (potassium, phosphate, and nucleic acids which convert to uric acid) into the bloodstream, precipitating acute kidney injury.

Determine the appropriate management for established tumor lysis syndrome.

Match with 'Continuous telemetry, aggressive isotonic fluid resuscitation, and administration of rasburicase'.

Aggressive fluid hydration maintains urine output, telemetry monitors hyperkalemia-induced arrhythmias, and rasburicase enzymatically degrades uric acid to prevent renal tubule crystallization.

Analyze the third presentation marked by lethargy, constipation, short QT interval, and calcium > 14 mg/dL.

Identify severe hypercalcemia of malignancy.

Symptoms of severe hypercalcemia typically emerge at levels above 14 mg/dL and induce profound intravascular volume depletion via nephrogenic diabetes insipidus.

Select the initial management for severe hypercalcemia of malignancy.

Match with 'Rapid volume expansion with intravenous 0.9% saline and subsequent administration of zoledronic acid'.

Restoration of intravascular volume with normal saline is always the first step, subsequently paired with bisphosphonates to inhibit osteoclastic bone resorption.

Analyze the fourth presentation showing fever in the setting of severe chemotherapy-induced neutropenia without a focal source.

Identify febrile neutropenia.

An absolute neutrophil count < 500/μL combined with fever is a life-threatening immunologic emergency where typical signs of focal infection are often absent.

Identify the mandatory initial intervention for febrile neutropenia.

Match with 'Immediate procurement of blood cultures followed by prompt initiation of an antipseudomonal beta-lactam'.

Empiric antibiotics must be started within 60 minutes of presentation due to the high risk of rapid clinical deterioration from uncontained bacterial proliferation, particularly from Pseudomonas aeruginosa.

Key Concept

Recognition and appropriate initial pharmacological management of acute oncologic emergencies (Malignant Spinal Cord Compression, Tumor Lysis Syndrome, Severe Hypercalcemia, and Febrile Neutropenia).

Estimated Time:2m 0s

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