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Equation Review
Topic vs. Equation
Topic | Equation |
---|---|
Sensitivity | Sensitivity= TP/(TP +FN) |
Specificity | Specificity= TN/(TN + FP) |
Positive predictive valve | PPV= TP/(TP + FP) |
Negative predictive valve | NPV= TN(TN + FN) |
Relative risk | R= [a/(a+b)] {c/(c+d)] |
Attributable risk | AR= [a/(a+b)] - [c/(c+d)] |
Number needed to treat | I/absolute risk reduction |
Number needed to harm | I/attributable risk |
Hardy-Weinberg equilibrium | p^2+2pq+q^2=1 p+q=1 |
Henderson-Hasselbalch equation | pH=pKa+log (HCO3-)/0.03 PCO2) |
Volume of distribution | Vd=amount of drug in the body/plasma drug concentration |
Clearance | CL=rate of elimination of drug/plasma drug concentration |
Half-life | t(1/2)=0.7xVd/CL |
Loading dose | LD=Cp x (Vd/F) |
Maintenance dose | MD=Cp x (CL/F) |
Cardiac output | CO=rate of O2 consumption/arterial O2 content - venous O2 content |
Cardiac output | CO=stroke volume x heart rate |
Mean arterial pressure | MAP=cardiac output x total peripheral resistance MAP= 1/3 systolic + 2/3 diastolic |
Stoke volume | SV=end diastolic volume - end systolic volume |
Ejection fraction | EF= (stoke volume/end diastolic volume) x100 |
Resistance | R=(driving pressure/flow) = [8n (viscosity) x length/πr^4] |
Net filtration pressure | Pnet= [(Pc-Pi)-(πc-πi)] |
Glomerular filtration rate | GFR= Uinulin x (V/Pinulin) = Cinulin |
Glomerular filtration rate | GFR=Kf [(PGC-PBS) - (πGC-πBS)] |
Effective renal plasma flow | ERPF=UPAH x (V/PPAH) = CPAH |
Renal blood flow | RBF=[RBF/(1-Hct)] |
Filtration fraction | FF=(GFR/RPF) |
Physiologic dead space | VD=VT x [(PaCO2-PeCO2)/PaCO2] |