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Auburn ECC > Equations/Lists/etc > Flashcards

Flashcards in Equations/Lists/etc Deck (66):
1

Kirby's rule of 20

Fluid balance, oncotic pull, glucose, electrolyte and acid-base balance, oxygenation/ventilation, mentation, perfusion/blood pressure, HR/rhythm/contractility, albumin levels, coagulation, RBC/Hgb concentrations, renal fxn, immune status/abx dose and selection/WBC count, GI motility/mucosal integrity, drug dosages/metabolism, nutrition, pain control, nursing care/mobilization, wound care/bandage change, TLC

2

Equation for MAP

MAP= diastolic BP - 1/3(Syst-Diast BP)

OR

MAP = CO * SVR

 

3

Equation for cardiac output

SV x HR

4

Starling-Landis equation

Pg 60 silverstein/hopper

5

Oxygen delivery equation

DO2=Q x CaO2 (Q=cardiac output, CaO2=arterial oxygen content)

6

Calculation for CaO2 (arterial O2 content)

[1.34 x SaO2 x Hgb] + [PaO2 x 0.003]

7

alveolar air equation, at 21% room air at sea level

PAO2=150-PaCO2

8

A-a gradient (simplified)

PAO2-PaO2 Normal is 20 means decreased oxygenating efficiency Should be performed when pt is on room air

9

P/F ratio

PaO2/FiO2 Normal is >400 mm Hg <200 consistent with ARDS

10

Strong ion difference

SID=(Na + K + Mg + Ca)-(Cl + A) A=unmeasured strong anions Must use corrected Cl

11

Corrected Chloride

Cl.corrected=Cl x (Na.normal/Na.meas)

12

Anion gap

AG= (Na + K)-(Cl + HCO3)

13

Henderson-Hasselbalch equation

pH=6.1 + log ([HCO3] ÷ [0.03 x PCO2])

14

Equation for pH

pH=pKa + log (HCO3/[PCo2 x SC]) SC=solubility coefficient of CO2 in blood=0.03

15

Venous admixture (shunt) calculation

Qs/Qt=(CcO2-CaO2)/(CcO2-CvO2) qs=shunt fraction, qt=cardiac output, cco2=oxygen content of end capilary blood CaO2=oxygen content of arterial blood CvO2=oxygen content of mixed venous blood must obtain from pulmonary artery

16

Oxygen content using jugular venous blood

(1.34xhgbxSO2) + (0.003 x PO2)

17

Fluid types/characteristics (transudate, exudate etc) for dogs

Pure transudate: TP 3, TNCC >7000

18

Fluid types/characteristics (transudate, exudate etc) for cats

Transudates: TP 3.5, TPr >0.56, TNCC >5900, LDHp >226

19

A-a gradient

[FiO2 x (Patm-Ph2o)-PaCO2/0.8)]-PaCO2

20

Calculation for PAO2

PAO2=FiO2 (760-47)- PaCO2/0.8

21

Equation of motion

muscle pressure + ventilation pressure= (tidal volume + compliance) + (resistance x flow)

22

Criteria for readiness for spontaneous breathing trial in mech ventilation

Improvement in primary disease P/F ratio >150-200 with FiO2 < 5 cm H20 adequate respiratory drive hemodynamic stability absence of major organ failure

23

Free water deficit

( [current Na/normal Na]-1) x (0.6 x BW) *body weight in kg

24

Bicarbonate deficit

BWkg x 0.3 x (24-measured HCO3)=meq HCO3 deficit

25

corrected Cl

=(Nanormal/Nameasured) x Cl measured

26

Equation for cardiac index?

CO/BSA 

BSA in m2

27

equation for stroke volume?

CO/HR

28

equation for CO?

MAP/R

R=resistance

29

equation for stroke volume index?

SVI=SV/BSA

BSA in m2

30

equation for systemic vascular resistance?

(MAP-RA pressure)/cardiac index

31

equation for pulmonary vascular resistance?

PVR=(mean PA pressure- PAOP)/cardiac index

32

Fick's equation?

CO=VO2/(CaO2-CvO2)

 

where CaO2-CvO2=arteriovenous O2 content difference

33

normal CVP values?

0-5 or 0-8 cm H2O

34

normal mean PAP?

5-12 mm Hg

35

Normal CO values?

Dog 125-200 ml/kg/min

Cat 120 ml/kg/min

36

Normal SvO2 & ScvO2?

ScvO2 >65%

SvO2 >75%

37

normal values for cardiac index?

3.5-5 L/min/m2

38

shunt fraction calculation?

QS/QT=(CcO2-CaO2)/(CcO2-CvO2)

 

Qs=shunt flow

Qt=total flow/cardiac output

CcO2=oxygen content of capillary blood

v=venous

a=arterial

39

alveolar gas equation?

PAO2=PIO2- (PACO2/R)

PIO2= FiO2 x (Patm-Ph2o)

R=0.8 (resp quotient)

40

Starling's equation?

41

Diffusion capacity equation?

DL=VCO/PACO

 

42

Alveolar dead space/Bohr equation?

VD/VT=(PACO2-PECO2)/PACO2

PECO2=ETCO2

normal is 0.2-0.35 (or 20-35%)

 To get percentage, multiple x 100

43

what is the Haldane effect?

the deoxygenation of blood increases its ability to carry CO2

44

Calculation for fractional shortening?

FS=(LVIDD-LVIDS)/LVIDD

45

equation for Laplace's law?

pressure=(4 x surface area tension)/radius

46

what is the equation for compliance?

compliance=(change in volume)/(change in pressure)

47

shunt fraction equation (for cardiac output)

Qs/Qt=(CcO2-CaO2)/(CcO2-CvO2)

48

what is the equation for Reynold's # and what does it represent?

Re=(2rvd)/n

predicts laminar vs turbulent flow

higher #-->turbulent flow

49

equation for Poiseuille's law?

R=(8nL)/πr4

50

equation for oxygen delivery (DO2)?

DO2=CaO2 x CO

51

equation for abdominal perfusion pressure (APP)

APP=MAP-IAP

52

how do you convert cm H2O to mm Hg?

1 cm H20 = 0.736 mmHg

1.36 cm H2O = 1 mmHg (torr)

53

how do you calculate a CVP based on the waveform?

Calculating CVP = (‘a’ wave peak + x descent base)/2

54

equation for pulse pressure variation?

Pulse pressure variation =

100 X (PPmax- PPmin)/{(PPmax+PPmin)/2}

55

56

what is the equation for oxygen extraction?

Oxygen extraction = CaO2 – CvO2

57

equation for O2 extraction ratio?

O2ER=[CaO2 – CvO2]/CaO2 = VO2/DO2

58

equation for systemic vascular resistance?

SVR=[(MAP – RA pressure)/CI]

59

what is the equation for osmolality? what about for effective osmolality?

  • Osmolality: 2(Na + K) + (gluc/18) + (BUN/2.8)
  • Effective osmolality: 2 (Na) + [gluc/18]

60

equation to determine amt of HCO3 to give to a patient?

mEq/L HCO3 to give=0.3 x BW x BD

BD=base deficit

BW=body weight

61

equation for corrected Na in relation to hyperglycemia?

Na(corr)=Na(meas) + 1.6([measured gluc-normal gluc]/100)

62

equation for Na deficit?

Na deficit=(target Na-patient Na) x (0.6 x BW)

63

equation for Cl gap? what does a high or low number mean?

Cl gap= Clnormal-Clcorrected

value >4à hypochloremic alkalosis

value < -4 à hyperchloremic acidosis

64

what is the equation for strong ion difference?

SID= HCO3 + albumin + P

Or

Na-Cl

65

what is the equation for albumin deficit to calculate the amt of human albumin to give to a patient?

Albumin deficit (gms)= 10 x (desired albumin-pt albumin) x weight (kg) x 0.3

66

what is the equation for cerebral perfusion pressure?

CPP=MAP-ICP