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Zorluk: ZorDiagnostic Workup and Test Sequencing

Match each clinical presentation with the most appropriate next diagnostic test.

  • 28-year-old woman at 14 weeks gestation with acute dyspnea; leg ultrasound is negative for deep vein thrombosis and chest radiograph is unremarkable.Ventilation-perfusion (V/Q) scan
  • 62-year-old man with tearing back pain and asymmetric radial pulses; serum creatinine is 3.1 mg/dL and he is hemodynamically stable.Transesophageal echocardiography (TEE)
  • 65-year-old woman with exertional chest pain requiring risk stratification; baseline ECG shows a left bundle branch block and severe osteoarthritis precludes exercise.Pharmacologic vasodilator myocardial perfusion imaging
  • 35-year-old man with fleeting chest pain; vital signs are normal, no hemoptysis is present, and his Wells score is 1.High-sensitivity D-dimer assay
  • 72-year-old man with a pulsatile abdominal mass noted on routine physical examination; he is completely asymptomatic and hemodynamically stable.Abdominal duplex ultrasonography

Cevap

The correct matches align each specific clinical scenario with its guideline-directed diagnostic modality: the pregnant patient with a normal chest X-ray requires a V/Q scan, the patient with suspected aortic dissection and renal failure requires a TEE, the patient with LBBB requires vasodilator myocardial perfusion imaging, the low-probability PE patient requires a D-dimer assay, and the asymptomatic patient with a pulsatile abdominal mass requires abdominal duplex ultrasonography.
Each diagnostic test is specifically indicated to circumvent contraindications or optimize predictive value: V/Q limits breast radiation in pregnancy, TEE avoids nephrotoxic contrast in renal failure, vasodilators prevent LBBB-induced septal artifacts, D-dimer prevents over-testing in low-risk patients, and ultrasound provides safe screening for asymptomatic abdominal masses.

Adım Adım Çözüm

1
Evaluate the clinical presentation of the 28-year-old pregnant patient.
Suspected pulmonary embolism with negative lower extremity ultrasound and normal chest X-ray.
Determines the next safest imaging modality; V/Q scan is indicated as it reduces maternal breast radiation compared to CTPA, and D-dimer is physiologically elevated in pregnancy.
2
Assess the 62-year-old man with tearing back pain.
Suspected aortic dissection in the setting of severe acute or chronic kidney injury.
To avoid contrast-induced nephropathy, TEE is chosen over CTA for rapid, accurate diagnosis of a dissection.
3
Analyze the 65-year-old woman with exertional chest pain.
Needs risk stratification but has a left bundle branch block and cannot exercise.
LBBB precludes exercise or dobutamine stress echocardiography due to septal motion artifact, requiring a vasodilator myocardial perfusion scan.
4
Review the 35-year-old man with fleeting chest pain.
Low pre-test probability for pulmonary embolism.
According to guidelines, a D-dimer test is the most appropriate initial step to rule out PE and avoid unnecessary imaging radiation.
5
Evaluate the 72-year-old man with a pulsatile abdominal mass.
Suspected abdominal aortic aneurysm in a stable, asymptomatic patient.
Abdominal duplex ultrasound is the most cost-effective and non-invasive initial test to establish the diagnosis and quantify aneurysm diameter.

Anahtar Kavram

Guideline-directed sequencing of diagnostic tests based on patient-specific contraindications, such as pregnancy, renal failure, and baseline electrocardiographic abnormalities.
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Diagnostic Workup and Test Sequencing

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