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Monitoring > Monitoring glossary lectures 3-5 > Flashcards

Monitoring glossary lectures 3-5 Flashcards

1
Q

Poiseuilles’s Law

A

resitance =8xVxL/pi r^4

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2
Q

leakage current

A

current that passes from energized electrical portions of device to metal chassis and the to the earth ground natural occurrence. all electrical equipment has leakage current

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3
Q

macroshock

A

causes ventricular fibrillation high value

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4
Q

microshock

A

low value current that passes directly to heart via in dwelling needle or catheter

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5
Q

< 1ma for 1 sec

A

faint tingling

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6
Q

1-8 mA

A

maximum harmless current

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7
Q

10-20 mA

A

PAINFUL SHOCK WITH LOSS OF MUSCULAR CONTROL LET GO THRESHHOLD

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8
Q

20-50MA

A

EXTREME PAIN FAINTING CANNOT LET GO

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9
Q

100-200mA

A

VENT. FIB. WILL START BUT RESPIRATORY WILL BE OK

NERVE DAMAGE

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10
Q

200+mA

A

CARDIAC ARREST SEVER BURNS DEATH

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11
Q

standard safe microshock leakage

A

5mA OR 60 Hz

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12
Q

line isolation monitor

A

predicts next fault monitors impedance

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13
Q

biometrics

A

science that include measurment off physiological variables and parameters

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14
Q

range

A

all input levels of amplitude and frequency which device is expected to operate

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15
Q

sensitivity

A

how small a variation that can be detected. ratio of output amplitude vs input amplitude

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16
Q

linearity

A

degree that variations in the output follow variation in input 1 to 1

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17
Q

hysteresis

A

“to be behind” variable response

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18
Q

frequency response

A

variation in sensitivity over a frequency range of measurement. system should be able to respond quickly enough to reproduce all frequency components of waveform

19
Q

natural frequency

A

frequency response id dependent on this. you want high natural frequency system to obtain more accurate pressure meausurements at lower frequencies

20
Q

accuracy

A

measure of closeness to actual true value (lab pump LPM reading vs actual)

21
Q

precision

A

degree of reproducibility of a measurement (in lab can you do it again)

22
Q

types of errors

A

range tolerances,mechanical (errors in meter movement), component errors due to drift or temp. variation, poor frequency responce, improper zeroing or calibration, atmospheric pressure

23
Q

stability

A

ability of system to resume steady state following disturbance

24
Q

electrode

A

captures biopotential

25
Q

transducer

A

converts non electrical physical force (pressure,temp) to an analogous electrical signal that is in proprtion

26
Q

artifacts

A

false signals superimposed on true signal

27
Q

dynamic response

A

systems ability to measure physiological pressure changes

28
Q

fidelity

A

indication of systems capacity to produce physiological event

29
Q

natural frequency

A

what system vibrates at when stimulated by pulsatile signals

30
Q

overshoot/undershoot

A

system vibration when patient’s pressure wave contains a component frequency equal to systems natural frequency

31
Q

ringing

A

small spikes on waveform due to inadequate dynamic response characteristics

32
Q

hemodynamic pressure

A

energy in form of pressure wave imparted by blood from lv

33
Q

kinetic energy

A

associated w motion

34
Q

hydrostatic pressure

A

fluid density and gravity conttribute

35
Q

inertia

A

inabilty to move or act. long tubing will create lag time

36
Q

formula for natural frequency

A

catheter radius x sqrt (volume elasticity of tranducer membrane/catheter length x fluid density x pi)

37
Q

ideal frequency

A

40-50 hz 20 hz minimum

38
Q

underdamping causes

A

compliant pressure tubing dercrease if waveform contains harmonic equal

39
Q

overdamping cause

A

component frequency exceed frequency response of system portions of those waveforms dependent on those waveforms will be obscured

40
Q

damping formula

A

4 x viscosity of fluid/ fluid density x cathter rad. ^2

41
Q

optimal damping coefficient

A

d=.64

42
Q

nature of over damped waveform

A

underestimates sbp and dbp due to air bubble,overly compliant tubing, catheter kinks,clots,stopcocks,no fluid in flush bags low flush bag pressure

43
Q

nature of underdamped

A

overestimates sbp and dbp due to long tubing and increased vascular resistance

44
Q

resonance

A

tendency of a system to oscillate at a greater amplitude st some frequencies

Monitoring (4 decks)

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