CICM equations
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1
Pulse pressure
Pp = SV/C
2
Venous return
VR = (MSFP - RAP) / VR = HR × SV
3
Mean Arterial Pressure (MAP)
MAP = (SBP + 2 × DBP) / 3
Reflects average pressure driving organ perfusion.
Reflects average pressure driving organ perfusion.
4
Coronary Perfusion Pressure (CPP)
CPP = DBP − LVEDP
Coronary flow occurs mainly in diastole
Coronary flow occurs mainly in diastole
5
Ejection Fraction
EF = (SV / EDV) × 100%.
6
What is the law of Laplace for LV wall tension?
Laplace Law (wall stress)
Wall stress = (Pressure × Radius) / (2 × Wall thickness)
Wall stress = (Pressure × Radius) / (2 × Wall thickness)
7
What does the Windkessel model describe?
Elastic recoil of large arteries → dampens pulsatile output & maintains diastolic flow
8
Factors which affect peripheral vascular resistance
$$R = \frac{8l\eta}{\pi r^4}$$
9
Definition of shear stress
$$Shear stress = Flow × Viscosity / Radius³$$
10
Vascular compliance equation
Compliance = ΔVolume / ΔPressure
11
Fick equation for VO₂
VO₂ = CO × (CaO₂ − CvO₂)
12
CvO₂ formula
CvO₂ = (1.34 × Hb × SvO₂) + (0.003 × PvO₂)
13
Determinants of vascular resistance (Poiseuille)
Resistance ∝ (Viscosity × Length) / Radius⁴