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Zorluk: ZorDiagnostic Workup and Test Sequencing

A 71-year-old male is evaluated in the hospital prior to discharge. He was admitted 3 days ago for acute decompensated heart failure presenting as sudden-onset pulmonary edema. He was successfully treated with intravenous furosemide and noninvasive positive pressure ventilation. He had a similar episode of flash pulmonary edema two months ago, despite having a normal left ventricular ejection fraction on a recent echocardiogram. Medical history includes hypertension, hyperlipidemia, and coronary artery disease. Two weeks prior to this admission, his primary care physician discontinued amlodipine and started valsartan due to poorly controlled blood pressure. Current medications include aspirin, atorvastatin, metoprolol, valsartan, and furosemide.

Vital signs today show a blood pressure of 178/96 mm Hg and a heart rate of 78/min. Physical examination reveals clear lungs bilaterally. Cardiac examination shows a regular rate and rhythm with an S4 gallop. Abdominal examination reveals a systolic-diastolic bruit heard in the periumbilical region.

Laboratory studies obtained this morning show:
Sodium: 139 mEq/L
Potassium: 4.8 mEq/L
Blood urea nitrogen: 44 mg/dL
Creatinine: 2.8 mg/dL (baseline was 1.2 mg/dL one month ago)

Which of the following is the most appropriate next step in the diagnostic workup?

  1. Renal duplex ultrasonographyCevap
  2. B
    Computed tomography angiography of the abdomen
  3. C
    Catheter-based digital subtraction angiography
  4. D
    Captopril-enhanced radionuclide renal scan
  5. E
    Plasma renin activity and serum aldosterone concentration

Cevap

Renal duplex ultrasonography is the most appropriate next step to diagnose likely renovascular hypertension while avoiding contrast nephropathy.
This patient's presentation is a classic triad for renovascular hypertension (renal artery stenosis): recurrent flash pulmonary edema, an abdominal systolic-diastolic bruit, and acute kidney injury following the initiation of an angiotensin system inhibitor (valsartan). To confirm this diagnosis, imaging of the renal arteries is required. The most appropriate initial step in a patient with a significantly elevated creatinine (2.8 mg/dL) is renal duplex ultrasonography. It is noninvasive, highly specific, and importantly, avoids the administration of nephrotoxic contrast material, making it the safest initial test for this patient.

Adım Adım Çözüm

1
Analyze the patient's clinical presentation and history.
The patient presents with recurrent flash pulmonary edema, severe hypertension, an abdominal bruit, and acute kidney injury following the initiation of an angiotensin receptor blocker (valsartan).
Identifying these key clinical clues establishes a high pre-test probability for renovascular hypertension (renal artery stenosis).
2
Determine the necessary diagnostic pathway.
Anatomic imaging of the renal arteries is required to confirm the diagnosis.
Biochemical tests cannot visualize the stenotic lesions responsible for the syndrome.
3
Evaluate patient-specific contraindications for diagnostic imaging.
The patient has a significantly elevated creatinine (2.8 mg/dL, up from 1.2 mg/dL), indicating acute kidney injury.
Imaging modalities must be selected to avoid further renal damage.
4
Select the optimal initial test.
Renal duplex ultrasonography is chosen over CT angiography or catheter angiography.
Ultrasonography provides noninvasive anatomic and hemodynamic evaluation without the use of nephrotoxic iodinated contrast or the risks associated with invasive catheterization.

Anahtar Kavram

In patients with a high clinical suspicion for renovascular hypertension complicated by acute kidney injury or severe chronic kidney disease, renal duplex ultrasonography is the preferred initial noninvasive diagnostic test to avoid contrast-induced nephropathy.
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Diagnostic Workup and Test Sequencing

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