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CVPR 322 Physiologic assesment > Ch 6 - 8 Pressure Monitoring Systems > Flashcards

Ch 6 - 8 Pressure Monitoring Systems Flashcards

(59 cards)

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1
Q

Fluid-Filled Monitoring Systems
•  Physical Principle: A change in pressure at any point in an unobstructed _____________ results in a _______________ at all other points of a system •

A

Fluid Filled System

Similar Pressure Change

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2
Q

Fluid medium is not very ____ accurate _______ of pressure

A

Compressible

Transmission

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3
Q

Guide wire > Introducer > vessel

A

> removal of introducer > Insertion of dilator/sheath > removal of dilator > Sheath advanced.

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4
Q

Fluid-filled Monitoring Components

A
  • On site Catheter
  • LOW Compliance pressure tubing.
  • Transducer
  • Amplifier / Monitor
  • Auto-flush System
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5
Q

Name the procedure whereby the pressure transducer and tip on the on site vascular catheter are on the same plane

A

 Leveling

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6
Q

Reference points for leveling ?

A

Heart Level / Tricuspid / Mid-chest

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7
Q

The effects of differences in transducer/midchest position on hemodynamic monitoring Principle: Liquid has a ___?

A

Weight

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8
Q

pressure exerted on the transducer diaphram by the weight of fluid within the monitoring tubing.

A

Hydrostatic Pressure

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9
Q

For every 1” the transducer is BELOW mid-chest level, the weight of the fluid on the transducer diaphragm will add how many mmHg?

A

2 mmHg ABOVE the true intravascular or intra-cardiac pressure.

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10
Q

For every 1” the transducer is ABOVE mid-chest level, the weight of the fluid on the transducer diaphragm will add how many mmHg?

A

2 mmHg below the true intravascular or intra-cardiac pressure.

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11
Q

Zero Referencing is Used to eliminate the effect of ?

A

Atmospheric Pressure

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12
Q

A reliable monitoring system should be as simple as possible.

Monitoring catheter bore size?
Connecting tubing ?
Tubing Connectors?
Pressure bag ?
System must be free of ?
No patient moving
A

> 18 gaugue or 7 Fr

Low Compliance

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13
Q

Overdamping waveform distortion :

A

(Exaggerated response)

Caused by tubing connections that are too compliant or too long

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14
Q

Underdamping waveform distortion :

A

(Blunted response)

Caused by air bubble in the circuit, partial obstruction of catheter or tubing that is too compliant or too long.

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15
Q

Appropriate length for tubing in fluid filled monitoring systems?

A

< 3 - 4 ft

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16
Q

Fluid-filled monitoring systems:.

4 SYSTEM related variables ?

A
  1. ) Pressure transducer + - H2O
  2. ) Air bubbles in system
  3. ) Compliance of tubing
  4. ) Catheter lumen size
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17
Q

Fluid-filled monitoring systems:

2 Patient -Related Variables ?

A

1.) hyperdynaminc due to sepsis,
AI, or stress.
2.) Tachycardia

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18
Q

loss of energy and vibrations within the monitoring system due to frictional resistance to movement of the pressure signal and absorption of the pulsatile energy.

A

Damping

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19
Q

Movement of the catheter tip in the circulation in response to pulsatile flow.

A

Catheter whip (fling)

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20
Q

The introduction of a selected pressure to the amp/ monitor of transducer to verify faithful reporduction of the pressure signal

A

Calibration

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21
Q

false signal superimposed on the true signal

A

Artifact (noise

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22
Q

The monitoring system’s ability to measure physiologic pressure changes, Dynamic response relates to the natural frequency & damping characteristics of the system.

A

Dynamic response

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23
Q

pressure produced by fluid in motion

A

Hydrodynamic pressure

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24
Q

pressure exerted by a stationary fluid column.

Study These Flashcards
A

Hydrostatic pressure

25
the frequency at which a in-situ catheter and monitoring plumbing vibrate when stimulated. Hz Tuning fork effect
Natural frequency
26
monitoring system vibration that occurs when the patient’s pressure wave contains a component frequency equal to the monitoring systems natural frequency. Upstroke & downstroke exaggerated (spiked).
Overshoot/undershoot
27
performed to eliminate effects of atmosphere and hydrostatic pressure from measured physiologic reading.
Zeroing
28
Troubleshooting a No Waveform situation?
- Power - Scale - Stopcocks
29
Troubleshooting Artifact ?
- Interference | - Movement
30
Troubleshooting Waveform Drifting ?
- Temperateure Change | - Kinked cable
31
Troubleshooting Unable to flush situation ?
-  Stopcock | - pressure bag
32
Troubleshooting High Readings?
-  Cailbration - level - flush
33
Troubleshooting Low Readings ?
 - Level | - loose connections
34
Troubleshooting Overdamped waveforms ?
-  Air bubbles - kinks - thrombus - position
35
Blood pressure is a measure of force as it is exerted on the _________ by the blood.
Arterial Walls
36
BP results from ?
The pressure generated by the beating heart and the resistance to blood flow by the arteries. 100 - 130 ------------- 60 - 90
37
Blood pressure monitoring is an essential ________________ tool.
Assessment
38
During CPB, the perfusionist constantly montiors ABP and will keep the MAP in the range of what ?
60-70 mmHg (adult)
39
Name the average driving force for movement of blood in the arterial system throughout the cardiac cycle. It is the same in all parts of the cardiovascular system when the patient is supine.
(MAP)
40
Indirect measurement of Arterial Blood Pressure ?
- Auscultation - Korotkoff sounds = stethoscope is placed over the brachial artery - Palpataion - Automatic Doppler
41
Direct measurement of Arterial Blood Pressure ?
- Occlusion techniques | - Intra-arterial line
42
Step # 1 in the Arterial trace?
Aortic Valve Opens
43
Step # 2 in the Arterial trace?
``` Pressure Increases as blood flows into the Aorta. AKA Anacrotic Rise (Inotropic Component) ```
44
Step # 3 in the Arterial trace?
Maximum Pressure (Systolic)
45
Step # 4 in the Arterial trace?
Aortic Valve closes AKA Dicrotic notch
46
Step # 5 in the Arterial trace?
Pressure Falls | as blood flows out of the Aorta
47
Step # 6 in the Arterial trace?
Minimum Pressure (Diastolic)
48
6 steps in the Arterial Trace?
``` AV opens Pressure increases Max Pressure (Systolic) AV closes Pressure falls Min Pressure (Diastolic) ```
49
Anacrotic Rise | (inotropic Component) =
Pressure Increase as blood flows into the Aorta.
50
Dicrotic notch =
AV valve closes
51
Pulse Pressure
(Systolic - Diastolic) = 40 mmHg
52
MAP equation ?
Systolic + (Diastolic x 2) ---------------------------------- 3
53
As the pressure falls, the Aortic valve closes; signaling what?
Onset of diastole
54
2 Arterial traces that show: 110/80 and 120/80. Which one indicates a pressure recorded in the Aorta ? Which indicates pressures recoded in the radial artery?
``` 110/80 = Aorta 120/80 = Radial ```
55
(* Capture)Pulse pressure increases with
- distance from the heart. | * The mean pressure does not change, therefore there is no loss of energy.*
56
What cause Pulse pressure to increases the further away from the heart?
Caused by reflected pressure waves bouncing off the walls of the aorta.
57
What are some conditions that affect Arterial Pressure Waveform Morphology ?
- Arrhythmias - Hypertension/hypotension - Aging - Post-op surgery - Hypovolemia - Vasoconstriction - Normal LV
58
Aging affects Arterial Pressure Waveform Morphology by ?
Loss of COMPLIANCE of peripheral vessels.
59
7 Hazards of indwelling arterial catheters ?
1. ) Ebololus 2. ) Thrombis 3. ) Tissue Ischemia 4. ) Infection 5. ) Hemorrhage 6. ) Accidental Drug Injection 7. ) Volume Overload

CVPR 322 Physiologic assesment (11 decks)

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