Hemodynamics Flashcards

1
Q

effect of PPV on afterload?

A

decreases LVTM thereby decreasing afterload

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2
Q

how does fluid lead to increased contractility?

A

increase preload leads to increased calcium affinity thereby increasing contractility

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3
Q

threshold of PPV to predict volume responsiveness?

A

> 13%

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4
Q

limitations of PPV for volume responsiveness?

A

sinus rythym, no spont ventilation, no dyssynchrony, TV 8-10cc/kr

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5
Q

things that can cause and overdamped a line?

A

obstruction of tip or hypovolema

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6
Q

things that can cause a underdamped a line?

A

vasocontriction, excessive tube length

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7
Q

CVP prominent a wave?

A

PHTN, tricuspid stenosis

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8
Q

CVP prominent v wave?

A

TR

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9
Q

CVP prominent A/V wave?

A

tamponade, pericarditis

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10
Q

CO equation?

A

MAP-CVP/SVR

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11
Q

thermodilution calculation of CO?

A

AUC using temperature

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12
Q

Fick versus thermodiluation of the CO measurement?

A

Fick more accurate but you need a Vo2 measurement

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13
Q

CVP with an IVC <1.5cm?

A

0-5

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14
Q

CVP with an IVC <1.5-2.5 cm with >50% variation?

A

5-10

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15
Q

CVP with an IVC 1.502.5 cm with <50% variation

A

10-15

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16
Q

CVP with IVC >2.5?

A

15-20

17
Q

why would ET CO2 rise in PLR?

A

transiently raises venous return thereby increasing Co2 return

18
Q

threshold for ETCO2 rise with PLR?

A

> 5% inc in ETCO2 predicts increase in CO by 15%

19
Q

when is goal timing for PAOP measurement?

A

end of exhalation and end of diastole whihc is C wave on waveform and also end of QRS

20
Q

difference of ScVO2 and true mixed venous O2?

A

ScVO2 is likely higher than true values in shock state

21
Q

why is PLR best test for fluid responsiveness?

A

can use in any patient

22
Q

positive PLR?

A

670-90 seconds legs up is equivalent to 150-300 cc bolus

> 10% PP

23
Q

dominant X descent with blunted y descent on CVP?

A

tamponade

24
Q

steep x and y descent?

A

pericardial constriction

25
Q

normal RV pressure?

A

23/8

26
Q

normal PA pressure?

A

23/6

27
Q

normal PCWP?

A

6-12