test 1 electric/hemo notes Flashcards

electronics and interventional

1
Q

how many Hz is 60 BPM

A

1 Hz

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2
Q

how many Hz is 120 BPM

A

2 Hz

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3
Q

what has a lower frequency; saline or contrast

A

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

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4
Q

what decreases as harmonic increases

A

amplitude

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5
Q

hemodynamic requires how much harmonics

A

10

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6
Q

the equation used for finding optimally damped

A

BPM/60 secs=fundamental frequency*10th harmonic

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7
Q

when is wedge pressure taken

A

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

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8
Q

how does string gauge work in wheatstone bridge

A

diaphragm hits wires

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9
Q

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

A

gravity

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10
Q

3 things that cause greater damping

A

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

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11
Q

how to fix damping caused by greater fluid viscosity

A

flush contrast

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12
Q

how to fix damping caused by catheter

A

move catheter to be more coaxial

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13
Q

what type of damp is also known as critically damp

A

optimal damp

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14
Q

what type of damp causes greater artificial pressure

A

under damp

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15
Q

what type damp is less responsive to rapid alterations in pressure

A

over damp

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16
Q

which symbol holds/store charge

17
Q

which symbol stores positive negative

A

battery/ DC storage device

18
Q

which symbol zero voltage and absorbs charge

19
Q

which symbol bridge for DC

20
Q

which symbol creates peaks and valleys

21
Q

which symbol boosts current

22
Q

which symbol has sine wave

A

ac voltage source

23
Q

high resistance in wheastone gives us while low gives us

A

systole;diastole

24
Q

you don’t get anything if

A

all resistors are equal no high or low

25
how to find pressure for edp, in graph etc
graph scale divide by 50 muiltply by amount of boxes
26
carrier signal into strain gauge out into scrambled and then descrambled in output (display) is
modulation and demodulation
27
drop in systolic pressure is characterized by
ventricularization
28