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35 Cards in this Set

  • Front
  • Back
What is optimal damping coefficient?
.6-.7
If frequency response is too low, system will be ______damped, _______estimating systolic
system will be overdamped, underestimating systolic
Underdamping leads to ______shoot and falsely ____SBP
overshoot; high
what does small amounts of dampening do to arterial wave form
overshoot, ringing, systolic falsely high
wha does large amount dampening do to arterial waveform?
compresses it, systolic falsely high, mean the same
what can cause dampin?
air, longer line, misaligned stopcock
As you move away from the aorta, the wave form systolic___ more than diastolic ______
systolic increases more than diastlic decreases
As you move further down the peripheral tree, what happens to the diacrotic notch?
shifts to the right
diacratic notch represents
closing of the aortic semilunar valve
too small of BP cuff causes falsely
high reading
when using ultrasonic dopplar system, probe is placed on the
radial artery
doppler system senses
red blood cell flow as cuff gets below systolic pressure
Doppler is used for____ and ____
return to flow and to find systolic
which parameters monior both the pt and anesthesia delivery sys?
Paw,Qaw, Vt, Resp Gas analysis,
Definition of precision
degree of consistency between repeated measurements of the same quantity
precision=
(measured-mean)/mean
Left ventricle is profused mostly during
diastole
right ventricle is profused mostly during
systole
Phases of the korotkoff sounds
1: snapping 2:murmurs 3:thumping 4:muffling 5:silence
If bp at heart is 115 mmHg, what is it 20 cm above heart?
20cm (.76mmHg/cmH20)=14.7; 115-15=100mmhg
If you increase the diameter of tubing, what happens to resonance/frequency
increase of resonance/frequency
resonance is
the tendency of a system to oscillate at maximum amplitude at certain frequencies
suggested rate for deflating a BP cuff
3mmHg per heart rate
What are the most sensitive leads for the detection of ventricular ischemia?
V4, V5
In NIBP MAP is measured by
maximum amplitude
how are systoic and diastolic measred in NIBP?
calculated from MAP
characteristics of an overdamped arterial BP system
squished, rounded, not sharp; looks like sine wave; will look like damped one
which pressure do we look for to indicate tissue perfusion?
MAP
A MAP of ______is necessary for cerebral perfusion and ___ for kidney
60; 70
vascular wall tension is represented by
systolic
which is the reference lead?
right leg
the reference lead (right leg) picks up____Hz which is the
60 hz (common mode rejection and feeds back from pt into cables, cancels out interference
Pressure inside cuff oscillates with ____
Heart rate
Physiological variations that cause errors in NIBP readings
Shock, large variations in pressure,(step or cyclic); atrial fib.
describe types of pressure changes required for errors in NIBP errors
10-15mmHg in 4-15sec; beat to beat variation 10-50mmHg in several beats; variation in pulse rate; >15% beat to beat