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Equation Review

Topic vs. 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]
Created by: zdevilbiss