CICM equations

Question 1

Pulse pressure

Accepted Answer

Pp = SV/C

Question 2

Venous return

Accepted Answer

VR = (MSFP - RAP) / VR = HR × SV

Question 3

Mean Arterial Pressure (MAP)

Accepted Answer

MAP = (SBP + 2 × DBP) / 3 Reflects average pressure driving organ perfusion.

Question 4

Coronary Perfusion Pressure (CPP)

Accepted Answer

CPP = DBP − LVEDP Coronary flow occurs mainly in diastole

Question 5

Ejection Fraction

Accepted Answer

EF = (SV / EDV) × 100%.

Question 6

What is the law of Laplace for LV wall tension?

Accepted Answer

Laplace Law (wall stress) Wall stress = (Pressure × Radius) / (2 × Wall thickness)

Question 7

What does the Windkessel model describe?

Accepted Answer

Elastic recoil of large arteries → dampens pulsatile output & maintains diastolic flow

Question 8

Factors which affect peripheral vascular resistance

Accepted Answer

$$R = \frac{8l\eta}{\pi r^4}$$

Question 9

Definition of shear stress

Accepted Answer

$$Shear stress = Flow × Viscosity / Radius³$$

Question 10

Vascular compliance equation

Accepted Answer

Compliance = ΔVolume / ΔPressure

Question 11

Fick equation for VO₂

Accepted Answer

VO₂ = CO × (CaO₂ − CvO₂)

Question 12

CvO₂ formula

Accepted Answer

CvO₂ = (1.34 × Hb × SvO₂) + (0.003 × PvO₂)

Question 13

Determinants of vascular resistance (Poiseuille)

Accepted Answer

Resistance ∝ (Viscosity × Length) / Radius⁴

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