Cardiophys Equations Flashcards
1
Q
Mean Arterial Pressure Equations
A
MAP = (CO X SVR) + CVP
MAP = Pd + (1/3 X PP)
2
Q
Systemic Vascular Resistance
A
SVR = (MAP - RAP)/ CO
3
Q
Pulmonary Vascular Resistance (2 equations)
A
- (MPAP - LAP) / CO
- (MPAP - PAWP) / CO
* PAWP = LAP
4
Q
Oncotic Pressure
A
Po = σTRCp
σ = Reflection coefficient Water = 0; Albumin = 1
R = Gas constant T = Temperature CRP = Plasma solute concentration
5
Q
Capillary Fluid movement (Starling Forces)
A
QF = k[(Pc - Pi) - (πp - πi)]
K = Filtration Constant P = Hydrostatic Pressure π = Oncotic Pressure
6
Q
Resistance relation to length and radius.
A
R = l/r^4
7
Q
Perfusion
A
dP = Pu - Pd
8
Q
Transmural pressure
A
DP = Pi - Po
9
Q
Reynolds Number
A
NR = ρDv/ η
Or Density X Diameter X meanvelocity / viscosity
10
Q
Shear Stress
A
τ = 4ηQ/πr^3
11
Q
Velocity as it relates to flow and SA
A
v = Q/A
12
Q
Poiseuille (Flow in a tube)
A
Q = πPr^4/8ηl
Or…
R = 8ηl/ πr^4
13
Q
Resistance in a tube
A
R = 8ηl/ πr^4
14
Q
Resistance in series
A
RT = RA + Ra +Rc + Rv + RV
15
Q
Resistance in Parallel.
A
Rx = 1/ (1/R1 + 1/R2 + 1/R3)
