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Flashcards in Q/A Deck (18):
1

Sensitivity is 90%, PPV is 97%, NPV is 92%, what is overall accuracy?

94% hint- true positives (66) plus true negatives (15) divided by total of all comparisons (90). Accuracy can't exceed all of the other parameters

2

When making the calculation for sensitivity, what is the numerator?

True positive studies, sensitivity is the # of true positives, divided by total # of positive studies by the gold standard

3

Can be used to clean transducer: n-Alkyl, cidex, diluted bleach

Cannot disinfect w/ sterile saline, not a disinfectant, sterile gel used for intra-op scanning or w/ open wounds

4

Maintains a safe environment:

Electrical checked regularly, emergency team, protocols for certain studies(treadmill), need BLS training. Not every employee respond nessecary

5

Sterile gel is only used for intra-op scanning or w/open wounds

Least likely to transmit infectious agents

6

Accuracy calculation is true positives + true negatives, divided by total of all comparisons. # can't be greater than PPV #

Tiny bit less than PPV, accuracy will fall between sensitivity & specificity as well as PPV & NPV. Accuracy = true positives plus true negatives divided by total of all comparisons

7

Which statistical parameter would you most likely give the physician in a scan that's normal?

Negitive predictive value

8

How to calculate sensitivity?

?

9

How to calculate specificity?

Specificity is the # of true negative tests divided by total # of Negitive studies by the gold standard. Ability of test to exclude disease

10

How to calculate sensitivity?

It's the ability to detect disease, calculated by dividing true positives tests all by positive diagnosis detected by the gold standard. 66 abnormal duplex scans compared to 72 angiography. 66/72. Numerator is true positives

11

Accuracy calculated by?

Determines how good a test is at identifying whether disease is present or not present

12

How is negative predictive value calculated?

Predicts how often a negative study is correct when compared to gold standard. This is calculated by dividing # of true negatives by all negative studies. Whether wrong or right

13

What method of test validation are most helpful in comparing the results of arterial duplex to arteriography?

Sensitivity & specificity

14

Electrical/electronic have safety code requirements, what can prevent any noninvasive evaluation from being done?

Electrical cord is not intact

15

How to calculate positive predictive value(PPV)?

Total # of true positives divided by total # of positive test, whether they are wrong or right

16

Emergency preparedness is part of maintaining a safe environment, what's least effective?

All personal reporting to supervisor

17

A physician is questioning preliminary findings, the PT's carotid exam excluded the presence of hemodynamically significant lesion, what parameter would you give the physician?

Negative predictive value

18

How is positive predictive value calculated?

Predicts how often a positive study is correct when compared to the gold standard & calculated by dividing # of true positives by all positive studies(whether wrong or right)