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
wheatstone bridge is located
transducer
26
electrucak signal is converted into a waveform by process called
modulation-demodulation
27
transducer that is zeroed while lying below level of pt mid chest will result in
mistakenly high pressures
28
mid axillary is also mid chest is also
phlebostatic axis
29
for radial arterial line on sitting up pt, where should zero port be positioned
at level of radial artery catheter
30
temp drift of a pressure transducer should be corrected periodically by
opening to air and pressing zero button
31
hr 60-100 what should frequency be
14 hz
32
what is used for testing optimal damping
square wave test
33
Ao pressure in hypotensive pt or pa pressure in pt with pulmonary htn what scale would you use
100mmHG
34
tracing is wonky too much going on what to use for improve pressure waveform
apply band pass filter to eliminate high frequencies
35
wheatstone bridge is a
direct current bridge
36
range of wheatstone bridge in ohms
1ohm to several Mohms
37
wheatstone bridge is used to calculate
mmhg pressure
38
wheatstone bridge displays
waveforms
39
wheatstone bridge is used for the measurement of physical parameters
as a strain gauge
40
by using variations on a wheatstone bridge we can measure
resistance and impedance
41
simplest applications of wheatstone bridge is
transducer
42
thermal compensation can be provided in a wheatstone bridge
re-zeroing to atmosphere periodically
43
pressure transducers come precalibrated at 0mmhg
false
44
pressure transducers sensitivity come precalibrated from the factory at 100 mmhg
true
45
radial artery systolic pressure is usually higher than Ao systolic pressure
true
46
the square wave flush test evaluates the fluid filled transducer system for proper damping
true
47
on the chest the junction of the manubrium and the sternum is known as
angle of Louis
48
squeezing inverted IV pressure bag because
eject air
49
when zeroing pressure transducer the air zero stopcock should be adjusted to the phlebostatic axis which is considered to be
Ra
50
when pt left arm is raised the zero level
should remain at Chets level
51
when pulling tail is squeezing the white continous flow device it
flushes the transducer
52
arterial line pressure should be inflated to
300 mmhg
53
what level the pressure transducer to the pt mid axillary line
bubble float level
54
frequency is measured in
hz
55
current is measured in
amps
56
resistance is measured in
ohms
57
electronic force is measured in
volts
58
radiation exposure is measured in
sieverts
59
another name for pressure recording amplifier
carrier amplifier
60
when Cath in left coronary pressure drops the catheter should be
pulls back
61
left coronary ostia is cannulated this drop in diastolic pressure is
ventricularization
62
elimination of vibrations at a certain frequency is accomplished thorigh the use of
filters
63