Diagnosis of Deep Vein Thrombosis (DVT) Modalities
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Questions and Answers

What is the main limitation of a CT scan venography for diagnosing DVT?

  • Poor availability
  • Low specificity
  • High radiation exposure (correct)
  • Low sensitivity

Which diagnostic test is contraindicated in patients with a glomerular filtration rate (GFR) less than 30?

  • Magnetic Resonance Venography (correct)
  • Compression Venous Ultrasound
  • Pulmonary angiogram
  • CT scan venography

In which scenario should the diagnosis of upper extremity DVT begin with an ultrasound?

  • If there are symptoms of PE
  • If the patient has a history of VTE
  • If the patient has elevated D-dimer levels (correct)
  • If the patient is over 65 years old

What is the most common cause of sudden cardiac arrest or circulatory collapse in patients younger than 65?

<p>Pulmonary embolism (B)</p> Signup and view all the answers

Which test has sensitivity ranging from 89% to 100% and specificity between 94% to 100% for diagnosing DVT?

<p>CT scan venography (B)</p> Signup and view all the answers

What is the primary reason Magnetic Resonance Venography is not widely used?

<p>High cost (B)</p> Signup and view all the answers

What is the percentage of patients with a low probability of PE based on the Wells criteria?

<p>3.4% (B)</p> Signup and view all the answers

In Wells Criteria for PE, what score range indicates a moderate probability of PE?

<p>2-6 points (B)</p> Signup and view all the answers

When should a D-dimer test be used according to the Wells Criteria?

<p>Only in patients with low probability (B)</p> Signup and view all the answers

What is the next step if a D-dimer test is positive in a patient with intermediate probability according to the Wells Criteria?

<p>Order a CT Pulmonary Angiogram (D)</p> Signup and view all the answers

What alternative diagnostic test can be considered if a CT Pulmonary Angiogram is contraindicated?

<p>VQ scan with or without a doppler of the lower extremities (D)</p> Signup and view all the answers

In patients with high probability of PE according to the Wells Criteria, what diagnostic test is recommended?

<p>CT Pulmonary Angiogram (B)</p> Signup and view all the answers

Which risk factor contributes the most to a high probability of DVT according to the Wells Clinical Prediction Rule?

<p>Entire leg swelling (C)</p> Signup and view all the answers

What is the prevalence of DVT for individuals with a score of 2 according to the Wells Clinical Prediction Rule?

<p>53% (B)</p> Signup and view all the answers

Which diagnostic test is considered the gold standard for diagnosing DVT?

<p>Venography (A)</p> Signup and view all the answers

What is a major drawback of using venography as a diagnostic test for DVT?

<p>Low sensitivity (C)</p> Signup and view all the answers

In the context of DVT management, what is the purpose of anticoagulation therapy?

<p>To prevent the formation of new blood clots (C)</p> Signup and view all the answers

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