Cardiophys Equations Flashcards
Mean Arterial Pressure Equations
MAP = (CO X SVR) + CVP
MAP = Pd + (1/3 X PP)
Systemic Vascular Resistance
SVR = (MAP - RAP)/ CO
Pulmonary Vascular Resistance (2 equations)
- (MPAP - LAP) / CO
- (MPAP - PAWP) / CO
* PAWP = LAP
Oncotic Pressure
Po = σTRCp
σ = Reflection coefficient Water = 0; Albumin = 1
R = Gas constant T = Temperature CRP = Plasma solute concentration
Capillary Fluid movement (Starling Forces)
QF = k[(Pc - Pi) - (πp - πi)]
K = Filtration Constant P = Hydrostatic Pressure π = Oncotic Pressure
Resistance relation to length and radius.
R = l/r^4
Perfusion
dP = Pu - Pd
Transmural pressure
DP = Pi - Po
Reynolds Number
NR = ρDv/ η
Or Density X Diameter X meanvelocity / viscosity
Shear Stress
τ = 4ηQ/πr^3
Velocity as it relates to flow and SA
v = Q/A
Poiseuille (Flow in a tube)
Q = πPr^4/8ηl
Or…
R = 8ηl/ πr^4
Resistance in a tube
R = 8ηl/ πr^4
Resistance in series
RT = RA + Ra +Rc + Rv + RV
Resistance in Parallel.
Rx = 1/ (1/R1 + 1/R2 + 1/R3)