MAP= diastolic BP - 1/3(Syst-Diast BP) OR MAP = CO \ SVR

Equations/Lists/etc Flashcards by Kendon Kuo

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

How well did you know this?

Not at all

Perfectly

Equation for MAP

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

MAP = CO * SVR

How well did you know this?

Not at all

Perfectly

Equation for cardiac output

SV x HR

How well did you know this?

Not at all

Perfectly

Starling-Landis equation

Pg 60 silverstein/hopper

How well did you know this?

Not at all

Perfectly

Oxygen delivery equation

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

How well did you know this?

Not at all

Perfectly

Calculation for CaO2 (arterial O2 content)

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

How well did you know this?

Not at all

Perfectly

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

PAO2=150-PaCO2

How well did you know this?

Not at all

Perfectly

A-a gradient (simplified)

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

How well did you know this?

Not at all

Perfectly

P/F ratio

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

How well did you know this?

Not at all

Perfectly

Strong ion difference

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

How well did you know this?

Not at all

Perfectly

Corrected Chloride

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

How well did you know this?

Not at all

Perfectly

Anion gap

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

How well did you know this?

Not at all

Perfectly

Henderson-Hasselbalch equation

pH=6.1 + log ([HCO3] ÷ [0.03 x PCO2])

How well did you know this?

Not at all

Perfectly

Equation for pH

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

How well did you know this?

Not at all

Perfectly

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

How well did you know this?

Not at all

Perfectly

Oxygen content using jugular venous blood

(1.34xhgbxSO2) + (0.003 x PO2)

How well did you know this?

Not at all

Perfectly

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

Pure transudate: TP 3, TNCC >7000

How well did you know this?

Not at all

Perfectly

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

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

How well did you know this?

Not at all

Perfectly

A-a gradient

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

How well did you know this?

Not at all

Perfectly

Calculation for PAO2

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

How well did you know this?

Not at all

Perfectly

Equation of motion

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

How well did you know this?

Not at all

Perfectly

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

How well did you know this?

Not at all

Perfectly

Free water deficit

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

How well did you know this?

Not at all

Perfectly

Bicarbonate deficit

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

How well did you know this?

Not at all

Perfectly

corrected Cl

=(Nanormal/Nameasured) x Cl measured

Equation for cardiac index?

CO/BSA BSA in m²

equation for stroke volume?

CO/HR

equation for CO?

MAP/R R=resistance

equation for stroke volume index?

SVI=SV/BSA BSA in m²

equation for systemic vascular resistance?

(MAP-RA pressure)/cardiac index

equation for pulmonary vascular resistance?

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

Fick's equation?

CO=VO2/(CaO2-CvO2) where CaO2-CvO2=arteriovenous O2 content difference

normal CVP values?

0-5 or 0-8 cm H2O

normal mean PAP?

5-12 mm Hg

Normal CO values?

Dog 125-200 ml/kg/min Cat 120 ml/kg/min

Normal SvO2 & ScvO2?

ScvO2 \>65% SvO2 \>75%

normal values for cardiac index?

3.5-5 L/min/m²

shunt fraction calculation?

Q_S/Q_T=(Cc_O2-Ca_O2)/(Cc_O2-Cv_O2) Qs=shunt flow Qt=total flow/cardiac output Cc_O2=oxygen content of capillary blood v=venous a=arterial

alveolar gas equation?

PAO2=PIO2- (PACO2/R) PIO2= FiO2 x (Patm-Ph2o) R=0.8 (resp quotient)

Starling's equation?

Diffusion capacity equation?

D_L=V_CO/PA_CO

Alveolar dead space/Bohr equation?

V_D/V_T=(P_ACO2-P_ECO2)/P_ACO2 P_ECO2=ETCO2 normal is 0.2-0.35 (or 20-35%) To get percentage, multiple x 100

what is the Haldane effect?

the deoxygenation of blood increases its ability to carry CO2

Calculation for fractional shortening?

FS=(LVIDD-LVIDS)/LVIDD

equation for Laplace's law?

pressure=(4 x surface area tension)/radius

what is the equation for compliance?

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

shunt fraction equation (for cardiac output)

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

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

Re=(2rvd)/n predicts laminar vs turbulent flow higher #--\>turbulent flow

equation for Poiseuille's law?

R=(8nL)/πr⁴

equation for oxygen delivery (DO2)?

DO2=CaO2 x CO

equation for abdominal perfusion pressure (APP)

APP=MAP-IAP

how do you convert cm H2O to mm Hg?

1 cm H20 = 0.736 mmHg 1.36 cm H2O = 1 mmHg (torr)

how do you calculate a CVP based on the waveform?

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

equation for pulse pressure variation?

Pulse pressure variation = 100 X (PPmax- PPmin)/{(PPmax+PPmin)/2}

what is the equation for oxygen extraction?

Oxygen extraction = CaO2 – CvO2

equation for O2 extraction ratio?

O2ER=[CaO2 – CvO2]/CaO2 = VO2/DO2

equation for systemic vascular resistance?

SVR=[(MAP – RA pressure)/CI]

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]

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

equation for corrected Na in relation to hyperglycemia?

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

equation for Na deficit?

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

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

Cl gap= Cl_normal-Cl_corrected value \>4à hypochloremic alkalosis value \< -4 à hyperchloremic acidosis

what is the equation for strong ion difference?

SID= HCO3 + albumin + P Or Na-Cl

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

what is the equation for cerebral perfusion pressure?