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