Hemodynamics Flashcards
effect of PPV on afterload?
decreases LVTM thereby decreasing afterload
how does fluid lead to increased contractility?
increase preload leads to increased calcium affinity thereby increasing contractility
threshold of PPV to predict volume responsiveness?
> 13%
limitations of PPV for volume responsiveness?
sinus rythym, no spont ventilation, no dyssynchrony, TV 8-10cc/kr
things that can cause and overdamped a line?
obstruction of tip or hypovolema
things that can cause a underdamped a line?
vasocontriction, excessive tube length
CVP prominent a wave?
PHTN, tricuspid stenosis
CVP prominent v wave?
TR
CVP prominent A/V wave?
tamponade, pericarditis
CO equation?
MAP-CVP/SVR
thermodilution calculation of CO?
AUC using temperature
Fick versus thermodiluation of the CO measurement?
Fick more accurate but you need a Vo2 measurement
CVP with an IVC <1.5cm?
0-5
CVP with an IVC <1.5-2.5 cm with >50% variation?
5-10
CVP with an IVC 1.502.5 cm with <50% variation
10-15
CVP with IVC >2.5?
15-20
why would ET CO2 rise in PLR?
transiently raises venous return thereby increasing Co2 return
threshold for ETCO2 rise with PLR?
> 5% inc in ETCO2 predicts increase in CO by 15%
when is goal timing for PAOP measurement?
end of exhalation and end of diastole whihc is C wave on waveform and also end of QRS
difference of ScVO2 and true mixed venous O2?
ScVO2 is likely higher than true values in shock state
why is PLR best test for fluid responsiveness?
can use in any patient
positive PLR?
670-90 seconds legs up is equivalent to 150-300 cc bolus
> 10% PP
dominant X descent with blunted y descent on CVP?
tamponade
steep x and y descent?
pericardial constriction
normal RV pressure?
23/8
normal PA pressure?
23/6
normal PCWP?
6-12
