BRS 1 equations Flashcards
Poisuilles law
8(viscosity x length)/πr^4
relate cardiac output, total peripheral resistance/peripheral vascular resistance and MAP
MAP = Q x PVR
calculate pulse pressure from SBP and DBP
PP = SBP-DBP
calculate MAP from pulse pressure and DBP
MAP = DBP +1/3PP
calculate pH
-log10[H+]
calculate [H+]
10^-pH
darcy’s law
pressure gradient = flow rate x resistance
calculate cardiac output from MAP and TPR
Q = MAP/TPR
calculate stroke volume from EDV and ESV
SV = EDV - ESV
stroke volume units?
mL
calculate ejection fraction
SV/EDV x 100
calculate cardiac output
heart rate x stroke volume
calculate stroke work
stroke volume x pressure
law of laplace
wall tension = pressure in vessel x radius / thickness
calculate from SBP and DBP
1/3SBP + 2/3DBP
compliance
volume difference/pressure difference
calculate transmural pressure
pressure inside - pressure outside
calculate net ultrafiltration pressure
hydrostatic p in glom. - hydrostatic p in bowm. - oncotic p of glomerulus
calculate glomerular filtration rate
net ultrafiltration pressure x ultrafiltration coefficient
calculate renal clearance
conc in urine x rate of urine pro / conc in plasma
units of renal clearance
mL/min
calculate clearance ratio
conc. of substance/ conc of inulin
calculate urine flow rate
volume/ time
calculate filtration fraction
GFR/RPF
calculate minute ventilation
tidal volume (L) x breathing frequency
calculate alveolar ventilation
(tidal V - dead space) x breathing frequency
nerst equation
equilibrium potential = RT/zF ln[X2]/[X1]
goldman-hodgkin-katz equation
describes membrane potential using log concentration inside/outside and permeability to ions. multiplied by -61
