SEE Monitors Flashcards
CVP
CVP 2
What is the mechanical event of the A wave? Electrical event?
Mechanical - Right atrial contraction
Electrical - Just after the P wave, atrial depolarization
What is the mechanical event of the C wave? Electrical event?
Mechanical - RV contraction
Electrical - Just after QRS (ventricular depolarization)
What is the mechanical event of the X descent? Electrical event?
Mechanical - RA relaxation
Electrical - ST segment
What is the mechanical event of the V wave? Electrical event?
Mechanical - Passive filling
Electrical - Just after the T wave (ventricular repolarization)
What is the mechanical event of the Y descent? Electrical event?
Mechanical - RA empties through tricuspid valve
Electrical - After T wave
Order of letters on CVP?
a
c
x
v
y
Which factors decrease CVP?
Transducer above phlebostatic axis
Hypovolemia
(Everything else increases)
Measurements of CVP
What can cause a loss of the A wave on the cvp?
Afib
V pacing
What can cause a large A wave on the CVP?
Tricuspid stenosis
Diastolic dysfunction
MI
COPD
V pacing
PVCs
Junctional
What can cause a large V wave on CVP?
Tricuspid regurgitation
Acute increase in volume
RV papillary muscle ischemia
Right atrial pressure on Swan
Right ventricular pressure on Swan
How does the waveform change when the PA is in the RV?
Systolic pressure increases
Diastolic is equal to CVP
PA pressure on Swan
How does the waveform change when the Swan is in the RV?
Systolic remains the same
Diastolic rises
Dicrotic notch is when pulmonic valve closes
PAOP on swan
How does waveform change during wedge pressure?
-Same as CVP waveform just now talking about the left atrium
Where should the tip of the PA catheter be?
Zone 3
How can you tell the tip is NOT Zone 3?
PAOP>PAEDP
Nonphaseic PAOP tracing
Inability to aspirate blood
What valve disease causes PAOP to underestimate LVEDV?
Aortic regurgitation
Everything else overestimates
What is the CO when the volume is too high and the solution is too cold?
Underestimates
