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Zorluk: OrtaDiagnostic Workup and Test Sequencing

Match each patient's clinical presentation with the most appropriate next step in their diagnostic workup.

  • A 45-year-old man presents to the emergency department reporting the abrupt onset of a severe 'thunderclap' headache that began 18 hours ago. Vital signs are normal. A non-contrast head computed tomography (CT) scan shows no acute intracranial abnormalities.Lumbar puncture
  • A 68-year-old man presents with sudden, severe, tearing chest pain radiating to his back. His blood pressure is 195/105 mmHg. Laboratory results show a blood urea nitrogen of 42 mg/dL and a serum creatinine of 3.1 mg/dL (baseline 1.0 mg/dL).Transesophageal echocardiography
  • A 58-year-old woman with a history of treated breast cancer reports 2 weeks of worsening lower back pain, recent onset of urinary overflow incontinence, and bilateral lower extremity weakness.Magnetic resonance imaging of the spine
  • A 29-year-old woman, G1P0 at 10 weeks gestation, presents with acute-onset right lower quadrant abdominal pain, rebound tenderness, and a temperature of 38.2°C (100.8°F).Abdominal and pelvic ultrasound

Cevap

The correct pairings require matching the headache patient with a lumbar puncture, the aortic dissection patient with kidney injury to transesophageal echocardiography, the suspected cord compression patient to an MRI of the spine, and the pregnant patient to an abdominal and pelvic ultrasound.
Each correct pairing matches the patient's specific clinical scenario to a diagnostic test that actively avoids contraindications (e.g., bypassing radiation in pregnancy, averting contrast in acute kidney injury) and appropriately escalates the diagnostic workup when an initial screening test is insufficient (e.g., pursuing a lumbar puncture after a negative delayed head CT).

Adım Adım Çözüm

1
Evaluate the patient with a thunderclap headache and a negative head CT.
Recognize that a CT scan performed 18 hours after onset has limited sensitivity for subarachnoid hemorrhage.
Lumbar puncture is the mandatory next step to definitively rule out a subarachnoid bleed by checking for xanthochromia.
2
Evaluate the patient with tearing chest pain and elevated creatinine.
Identify acute kidney injury as a strict contraindication to the standard CT angiography used for suspected aortic dissection.
Transesophageal echocardiography provides excellent visualization of the thoracic aorta without the need for nephrotoxic contrast.
3
Evaluate the patient with a cancer history and red-flag neurological signs.
Identify high suspicion for cauda equina syndrome or epidural spinal cord compression.
MRI of the spine is the gold standard imaging modality and must be sequenced immediately to guide emergency neurosurgical or radiation interventions.
4
Evaluate the pregnant patient with an acute abdomen.
Recognize the need to avoid ionizing radiation (like CT scans) during the first trimester.
An ultrasound allows safe evaluation of the appendix and ovaries to rule out conditions like appendicitis or ovarian torsion.

Anahtar Kavram

Appropriate selection of diagnostic imaging and testing must account for the clinical time course, anatomical target, and patient-specific contraindications (e.g., pregnancy, renal failure) to avoid unnecessary harm.
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Diagnostic Workup and Test Sequencing

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