Match each patient's clinical presentation with the most appropriate initial or definitive diagnostic imaging modality based on safety, diagnostic yield, and clinical guidelines.
- Elderly patient presenting with sudden-onset global aphasia and dense right hemiparesis that commenced exactly 90 minutes ago.Non-contrast computed tomography (CT) of the head
- Adult patient with a baseline eGFR of 18 mL/min/1.73 m² presenting with sudden pleuritic chest pain and hypoxemia two weeks after joint replacement.Ventilation-perfusion (V/Q) lung scan
- Young adult male with a six-month history of insidious-onset lower back pain that radiates to the buttocks and improves with physical activity.Plain radiography of the sacroiliac joints
- Patient with chronic diabetic neuropathy presenting with a deep plantar ulcer probing to the bone, with no periosteal reaction noted on initial X-rays.Magnetic resonance imaging (MRI) of the foot with and without intravenous contrast
Cevap
The stroke patient requires a non-contrast head CT to rule out hemorrhage; the renal failure patient with suspected pulmonary embolism requires a V/Q scan to avoid iodinated contrast; the young male with suspected ankylosing spondylitis should be initially evaluated with sacroiliac joint plain radiography; and the diabetic patient with a deep ulcer and negative X-rays requires an MRI of the foot to definitively rule out osteomyelitis.
Each correct pairing aligns with evidence-based medicine guidelines: prioritizing speed and hemorrhage detection in acute stroke (CT), avoiding nephrotoxic contrast in severe kidney disease (V/Q scan), proceeding with standard initial cost-effective imaging for sacroiliitis (X-ray), and utilizing the highest sensitivity test for complicated diabetic foot infections (MRI).
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Anahtar Kavram
The selection of diagnostic imaging must balance diagnostic accuracy, disease acuity, and patient-specific contraindications (such as renal failure precluding iodinated contrast).
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