test 1 electric/hemo notes

Question 1

how many Hz is 60 BPM

Answer 1

1 Hz

Question 2

how many Hz is 120 BPM

Answer 2

2 Hz

Question 3

what has a lower frequency; saline or contrast

Answer 3

contrast (because it’s thicker, that’s why it causes flatline when injected)

Question 4

what decreases as harmonic increases

Answer 4

amplitude

Question 5

hemodynamic requires how much harmonics

Answer 5

10

Question 6

the equation used for finding optimally damped

Answer 6

BPM/60 secs=fundamental frequency*10th harmonic

Question 7

when is wedge pressure taken

Answer 7

end of expiratory (10-15mmhg) when balloon is inflated

Question 8

how does string gauge work in wheatstone bridge

Answer 8

diaphragm hits wires

Question 9

what causes transducer to be mistakenly high or low when placed above or below the midchest line

Answer 9

gravity

Question 10

3 things that cause greater damping

Answer 10

greater fluid viscosity (contrast rather than saline)
smaller catheter size (5F rather than 6F)
less dense fluid (injecting bubbles)

Question 11

how to fix damping caused by greater fluid viscosity

Answer 11

flush contrast

Question 12

how to fix damping caused by catheter

Answer 12

move catheter to be more coaxial

Question 13

what type of damp is also known as critically damp

Answer 13

optimal damp

Question 14

what type of damp causes greater artificial pressure

Answer 14

under damp

Question 15

what type damp is less responsive to rapid alterations in pressure

Answer 15

over damp

Question 16

which symbol holds/store charge

Answer 16

capacitor

Question 17

which symbol stores positive negative

Answer 17

battery/ DC storage device

Question 18

which symbol zero voltage and absorbs charge

Answer 18

ground

Question 19

which symbol bridge for DC

Answer 19

diode

Question 20

which symbol creates peaks and valleys

Answer 20

resistors

Question 21

which symbol boosts current

Answer 21

coil

Question 22

which symbol has sine wave

Answer 22

ac voltage source

Question 23

high resistance in wheastone gives us while low gives us

Answer 23

systole;diastole

Question 24

you don’t get anything if

Answer 24

all resistors are equal no high or low

Question 25

how to find pressure for edp, in graph etc

Answer 25

graph scale divide by 50 muiltply by amount of boxes

Question 26

carrier signal into strain gauge out into scrambled and then descrambled in output (display) is

Answer 26

modulation and demodulation

Question 27

drop in systolic pressure is characterized by

Answer 27

ventricularization