I&M - Test 1 Brainscape - Sheet1 - Sheet 1(1) Flashcards Preview

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Flashcards in I&M - Test 1 Brainscape - Sheet1 - Sheet 1(1) Deck (241)
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1

measured value =

true value + (systmatic + random error)

2

example of a systematic error

transducer lower than patient producing higher reading, predictable

3

example of random errors

multiple BP measurements in atrial fibrillation, unpredictable, average repeated reduces these

4

closeness of agreement between measured and true value

accuracy

5

the degree of consistency

precision

6

ability to maintain precision

reproducibility

7

likelihood an event will be detected

sensitivity

8

normal=no event indicated

specificity

9

accuracy formula

correct/total x 100

10

precision formula

measure-mean /mean

11

sensitivity

hits/ hits+misses

12

specificity

correct rejections / (correct rejections + false alarms)

13

characteristics of signal

each signal has inherent variability. The distinction between normal and adnormal

14

mechanics of the sensor

ability to detect the underlying state of the system

15

mechanics of the artifact rejection

ability to sense degredation in quality of signal and filter out noise

16

programming by the user

adjustable alarm limits can adjust hit to miss and false alarms and correct alarms

17

% saturation error in pulse ox

3%. Ex 97 can be 94 or 100 for adults. Neonate +/- 4%

18

% pulse rate variation

3% +/-

19

Bland-Altman plot

table for comparison of values in standard deviations from baseline

20

slow, low frequency component of a signal

drift

21

rise time

time it takes for instrument to get from 10 to 90% of complete response

22

frequency response

how well can instrument can reproduce the signal being measured

23

# of harmonic waves needed to produce a box like waveform

5 to 6

24

the greater the rate of rise or the original waveform

the greater the number of harmonics needed

25

example of combining harmonics

arterial waveform

26

Dichrotic notch - what does it mean if it's closer to the beginning of the waveform?

closer the reading is to the heart

27

transient increase in aortic pressure upon closure of aortic valve

dichrotic notch

28

What is the resulting aortic waveform?

the mean pressure

29

Symbol for freqeuncy

rounded "w"

30

Hz =

cycles per second (s^-1)