Central Venous Pressure and PA catheter Flashcards
Normal CVP
2-7 mmHg
the filling pressure is used as an indicator for
cardiac volume with the understanding that adequate volumes will generate optimal cardiac contractility
three waveforms for cvp and two negative slopes
a,c,v
x,y depressions
a wave represents
right atrial pressure increase during the phase of atrial contraction
c wave represents
bulging of the closed tricuspid valve into the right atrium during the beginning of ventricular systole
x descent
during ventricular systole and corresponds to atrial relaxation
v wave
filling of the atrium while the tricuspid valve is closed
y descent
tricuspid valve opens and the atrium starts to empty
CU of CVP
determine intravascular volume status
In A-fib, the a wave will vanish and be replaced with …
more distinguishable c wave
tricuspid regurgitation can be diagnosed by
noticing a more prominent C-V wave
tamponade will exhibit an elevated
CVP waveform and y descent
AV dissociation teh contraction of the atrium against a closed tricuspid valve will eleicit a
enlarged A wave called a “cannon” wave
PA catheter is how long
110 cm.
Pa catheter has a capacity of
1.5 mL
Pa catheter may be used to measure
CO, Mixed venous oxygen tneion, pulmonary arterial and right atrial pressures, and indirectly, LVEDP
Complications from PA catheters include
dysrhythmias, catheter knotting, cardiac valve injury, and pulmonary artery rupture
Measure of LVEDP, when the mitral valve is open …
the pressure b/w the left atrium and the left ventricle should equalize, allowing the tip of the catheter to register the LVEDP.
lvedp values: normal larger CO dyspnea fluid mvmt into alveoli frank pulmonary edema
normal: 8-12 mmHg LARGE CO: 14-18 mmHg Dyspnea: over 18 mmHg Fluid mvmt into alveoli: more than 20 mmHg frank pulm edema: over 30 mmHg
Mixed venous oxygen tension is a global rep of
total body oxygen supply and demand
normal PvO2 is
about 40 mmHg with a saturation of 75%
