Diagnosis of Deep Vein Thrombosis (DVT) Modalities

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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?

Pulmonary embolism Signup and view all the answers

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

CT scan venography Signup and view all the answers

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

High cost Signup and view all the answers

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

3.4% Signup and view all the answers

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

2-6 points Signup and view all the answers

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

Only in patients with low probability 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?

Order a CT Pulmonary Angiogram Signup and view all the answers

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

VQ scan with or without a doppler of the lower extremities Signup and view all the answers

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

CT Pulmonary Angiogram 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?

Entire leg swelling 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?

53% Signup and view all the answers

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

Venography Signup and view all the answers

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

Low sensitivity Signup and view all the answers

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

To prevent the formation of new blood clots Signup and view all the answers