C8&9: CHI Square & Intraoperative

Question 1

what are the 5 parameters we use to measure the confidence of a non-invasive test compared to gold standard

Answer 1

1. Sensitivity
2. Specificity
3. Positive predictive value
4. Negative predictive value
5. Accuracy

Question 2

what is sensitivity

Answer 2

ability to detect disease when present

Question 3

what is specificity

Answer 3

ability of a test to identify normal/ability to detect no disease when no disease is present

Question 4

what is PPV

Answer 4

% of non-invasive test results that accurately predict abnormality

Question 5

what is NPV

Answer 5

% of test results that accurately predict normality

Question 6

what is accuracy

Answer 6

% of correct non-invasive diagnoses

Question 7

what is prevalence

Answer 7

of all cases in a population at one point in time

Question 8

what is standard deviation

Answer 8

looks at the spread of data around any mean or average value

Question 9

what is incidnce

Answer 9

rate of occurrence of new cases in a population in a specific period

Question 10

which vessel would you monitor during an invasive procedure?

what is considered an adequate velocity of blood flow for this vessel?

Answer 10

• monitor the velocity of the Middle Cerebral Artery during the prodecure…
• > /= 10 cm/sec is adequate