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HY Equations

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ekadar's version from 2016-05-12 16:32

Section 1

Question Answer
SensitivityTP/(TP + FN)
SpecificityTN/ (TN + FP)
Positive Predictive Value TP/ (TP + FP)
Negative Predicative ValueTN/ (FN + TN)
Odds ratio(a/c)/(b/d)
relative riska/(a+b) / c/(c+d)
attributable risk a/(a+b)-c/(c+d)
attributable risk reduction c/(c+d)-a/(a+b)
relative risk reduction 1-RR
Number needed to treat 1/ARR
Number needed to harm 1/AR
memorize

Section 2

Question Answer
Half LIfe(.693 x Vd)/CL
Volume of distribution amount of drug in the body/plasma drug concentration
loading doseplasma concentration x volume of distribution
maintenance doseplasma concentration x clearance
memorize

Section 3

Question Answer
COSV X HR
COrate of O2 consumption/ (arterial O2 content - venous O2 content)
Stroke volumeSV=EDV-ESV
MAPcardiac output x TPR
SVEDV-ESV
EFSV/EDV
memorize
for graphs look at TPR first

Section 4

Question Answer
capillary fluid excahngeKf[(Pc-Pi)-(ONCOTICc-ONCOTICi)
Renal clearanceUxV/P
for renal clearance if Cnet reabsorption of substance
for renal clearance if C>GFRnet secretion of substance
GFRUinuliin x V/P inulin
GFRkf(Pgc-Pbs-Oncoticgc)
FFGFR/RBF
WINTERS1.5 (HCO3) plus 8 plus or minus 2
memorize

pulmonary

Question Answer
alveolar gas equationPIo2 - Paco2/R
minute ventilationtidal volume times breaths/min
alveolar ventilation(tidal volume-dead space volume) times breaths/min
memorize

RENAL FORMULAS

Question Answer
renal clearance formulaCx = UxV/Px
what is used as a proxy for GFR?creatinine clearance(inulin is most perfect tho)
what is used as a proxy for RPF?PAH clearance
general GFR formulaKf[(Pgc - Pbs) - (πgc - πbs) --> remember that πbs is normally 0 bc no protein in filtrate
normal GFR?about 100 mL/min
normal FF?about 20%
RBF formulaRPF/(1 - Hct)
eRPF formulaeRPF = Upah x V/Ppah = Cpah
FFGFR/RPF
what is number 1 indicator of diabetic nephropathy?albuminuria
normal clearance variations in pregnancy?glucosuria and aminoaciduria bc decreased ability of PCT to reabsorb these
AA constrictiondecreased GFR, decreased RPF, no change FF
EA constrictionincreased GFR, decreased RPF, increased FF
increased plasma protein concentrationdecreased GFR, no change RPF, decreased FF
decreased plasma protein concentrationincreased GFR, no change RPF, increased FF
ureter constrictiondecreased GFR, no change RPF, decreased FF
anion gap formulaNa - (Cl + HCO3)
winters formulafor metabolic acidosis compensation --> PCO2 = 1.5 (HCO3-) + 8 +/- 2
memorize

 

Question Answer
pressure in RA0/8
pressure in RV4/25
pressure in pulmonary artery9/25
pressure in left atrium2/12
pressure in left ventricle9/130
pressure in aorta70/130
edema in heart faillureincreased capillary hydrostatic pressure
edema in nephrotic syndromelose protein. oncotic pressure in capillary is too low!
edema in post renal obstructionincreases bowman's space hydrostatic
memorize