Vascular 2 Ch 34 - Multiple Choice

Sensitivity measures the:

a. Inability to find negative disease

b. Ability to measure the proportion of actual negative studies

c. Ability to find disease when disease is present

d. Ability to measure the proportion of actual positive and negative studies

c. Ability to find disease when disease is present

Reability is:

a. The accuracy of an ultrasound measurement

b. The consistency of the sonographer

c. The consistency of obtaining similar results under similar circumstances

d. The consistency of the interpreting physician

c. The consistency of obtaining similar results under similar circumstances

Positive predictive value (PPV) is calculated by:

a. True positives divided by false positives

b. True positives divided by the sum of true positives plus false positives

c. True positives by false negatives

d. True negatives by true positives

b. True positives divided by the sum of true positives plus false positives

Why is am angiogram considered to be a "gold standard"?

a. It has a long history of accuracy

b. It has a long history of being sensitive to finding disease

c. It can image virtually all arteries of a leg or arm

d. It can image calcific arteries

a. It has a long history of accuracy

A true positive finding is:

a. If an ultrasound show a patent common femora; vein and a venogram demonstrates a common femoral vein thrombosis

b. If an ultrasound shows a deep vein thrombosis (DVT) at the CFV and a venogram demonstrates a popliteal vein thrombosis

c. If an ultrasound shows a DVT at the common femoral vein and a venogram demonstrates a popliteal vein thrombosis

d. If an ultrasound shows a patent common femoral vein and a venogram demonstrates a common femoral vein.

b. If an ultrasound shows a DVT at the CFV and a venogram demonstrates a CFV thrombosis.

A true negative finding is:

a. If an ultrasound shows a less than 50% stenosis in the internal carotid artery and an angiogram demonstrates no disease present within the internal carotid artery

b. If an ultrasound shows a normal internal carotid and an angiogram demonstrates no disease within the internal carotid

c. If an ultrasound shows a normal internal carotid artery and an angiogram demonstrates a significant stenosis present in the internal carotid artery

d. If an ultrasound shows a < 50% stenosis in the internal carotid and an angiogram demonstrated a less than 50% stenosis in the internal carotid artery

b. If an ultrasound shows a normal internal carotid artery and an angiogram demonstrates no disease present within the internal carotid

If an ultrasound demonstrates elevated velocities in a renal artery, which is interpreted as a stenosis but angiography shows no disease present, the ultrasound finding would be called a:

a. False negative

b. True negative

c. False Positive

d. True positive

c False positive

If a venous ultrasound fails to show a thrombosis and is read as normal but a venogram indicates a popliteal DVT, this ultrasound would be an example of a:

a. True negative

b. True positive

c. False positive

d. False negative

d. False negative

The Chi square compares:

a. The number of times you can find disease by the total amount of disease present

b. The difference between what you expect and what you actually observe

c. The ability to find disease present as compared to a gold standard

d. The ability to say something is normal as compare to a standard test

b. The difference between what you expect and what you actually observe.

The ability a test to say something is normal is a measure of:

a. Sensitivity

b. Accuracy

c. Reliability

d. Specificity

d. Specificity

This is a measure of how "close" something is to the actual value and is calculated as a percentage of correct results.

a. Reliability

b. True positives

c. Accuracy

d. True predictive value

c. Accuracy