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Carnegie > test 1 electric/hemo hw > Flashcards

test 1 electric/hemo hw Flashcards

electronics and interventional

1
Q

when catheter is too deep seated and receives backward pressure from the myocardium

A

ventricularization of the coronary artery

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2
Q

20 mmhg cardiac pressure recording too low. where was the transducer zeroed?

A

10 in above pt mid chest. (+2mmHg for every inch above level)

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3
Q

the usual sweep speed for displaying pressure recordings is

A

10 sec

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4
Q

another name for string gauge is

A

wheatstone bridge

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5
Q

adding extra lengths of tubing will cause

A

drop in pressure

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6
Q

balancing is also known as

A

zero

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7
Q

AO-RV-PA is this pullback or insertion?

A

insertion

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8
Q

PA-RV-AO is this pullback or insertion

A

pullback

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9
Q

high frequency filter can cause damping

A

false

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10
Q

arterial have triangular which have sine waves

A

none

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11
Q

time shifting the pcw waveform is useful to ensure accuracy when measuring

A

mitral valve gradient

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12
Q

a. No overshoot
b. No over damping
c. Good signal to noise ratio
d. Appropriate filtering
these are known as

A

optimal frequency response

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13
Q

a. Inappropriate frequency response caused by damping coefficient
b. Tangled cables, loose connections
c. Fluid leaks
d. Electromagnetic interference
these are considered

A

electronic artifacts

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14
Q

Pressure applied to a liquid at any point is transmitted equally in all
directions is known as

A

pascals law

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15
Q

pascals and mmhg are units of

A

pressure

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16
Q

the filters used in hemodynamic monitoring is ______ band pass filter

A

low

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17
Q

which waveform would be the most likely for respiration excursion

A

PCW

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18
Q

proper filtering gets rid of respiratory variation

A

false

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19
Q

a _____hz filter gets rid of ac power interference

A

60

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20
Q

strain gauge converts fluid pressure to an electrical signal using

A

variable resistors

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21
Q

two pressure channels are required to record

A

simultaneous pressures

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22
Q

what assures proper baseline and top of scale channels

A

calibration

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23
Q

changing the ____adjusts band pass filter to reduce noise

A

HZ

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24
Q

40 mm scale is for

A

Right heart pressures

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25
Q

wheatstone bridge is located

A

transducer

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26
Q

electrucak signal is converted into a waveform by process called

A

modulation-demodulation

27
Q

transducer that is zeroed while lying below level of pt mid chest will result in

A

mistakenly high pressures

28
Q

mid axillary is also mid chest is also

A

phlebostatic axis

29
Q

for radial arterial line on sitting up pt, where should zero port be positioned

A

at level of radial artery catheter

30
Q

temp drift of a pressure transducer should be corrected periodically by

A

opening to air and pressing zero button

31
Q

hr 60-100 what should frequency be

A

14 hz

32
Q

what is used for testing optimal damping

A

square wave test

33
Q

Ao pressure in hypotensive pt or pa pressure in pt with pulmonary htn what scale would you use

A

100mmHG

34
Q

tracing is wonky too much going on what to use for improve pressure waveform

A

apply band pass filter to eliminate high frequencies

35
Q

wheatstone bridge is a

A

direct current bridge

36
Q

range of wheatstone bridge in ohms

A

1ohm to several Mohms

37
Q

wheatstone bridge is used to calculate

A

mmhg pressure

38
Q

wheatstone bridge displays

A

waveforms

39
Q

wheatstone bridge is used for the measurement of physical parameters

A

as a strain gauge

40
Q

by using variations on a wheatstone bridge we can measure

A

resistance and impedance

41
Q

simplest applications of wheatstone bridge is

A

transducer

42
Q

thermal compensation can be provided in a wheatstone bridge

A

re-zeroing to atmosphere periodically

43
Q

pressure transducers come precalibrated at 0mmhg

A

false

44
Q

pressure transducers sensitivity come precalibrated from the factory at 100 mmhg

A

true

45
Q

radial artery systolic pressure is usually higher than Ao systolic pressure

A

true

46
Q

the square wave flush test evaluates the fluid filled transducer system for proper damping

A

true

47
Q

on the chest the junction of the manubrium and the sternum is known as

A

angle of Louis

48
Q

squeezing inverted IV pressure bag because

A

eject air

49
Q

when zeroing pressure transducer the air zero stopcock should be adjusted to the phlebostatic axis which is considered to be

A

Ra

50
Q

when pt left arm is raised the zero level

A

should remain at Chets level

51
Q

when pulling tail is squeezing the white continous flow device it

A

flushes the transducer

52
Q

arterial line pressure should be inflated to

A

300 mmhg

53
Q

what level the pressure transducer to the pt mid axillary line

A

bubble float level

54
Q

frequency is measured in

A

hz

55
Q

current is measured in

A

amps

56
Q

resistance is measured in

A

ohms

57
Q

electronic force is measured in

A

volts

58
Q

radiation exposure is measured in

A

sieverts

59
Q

another name for pressure recording amplifier

A

carrier amplifier

60
Q

when Cath in left coronary pressure drops the catheter should be

A

pulls back

61
Q

left coronary ostia is cannulated this drop in diastolic pressure is

A

ventricularization

62
Q

elimination of vibrations at a certain frequency is accomplished thorigh the use of

A

filters

63
Q
A

Carnegie (4 decks)

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