ITE CA2 Formulas normal editor

Question 1

Wall tension and associated law

Answer 1

The law of LaPlace describes the various factors affecting the wall tension:

Wall tension (T) = (P * r) / (2 h)
Where P is the pressure within the ventricle, r is the radius of the ventricle, and h is the thickness of the ventricular wall

Question 2

Reynold’s equation

Answer 2

Re = ρUL/u

Where ρ is density, U is equal to fluid velocity, L is the length of the tubing, and u is the viscosity of the fluid. Note that the modified Bernoulli Equation applies to laminar flow (ReD < 2300, parabolic flow profile), but not to turbulent flow (ReD > 4000, blunted flow profile)

Question 3

CPP

Answer 3

CPP=DBP - LVEDP

Question 4

Modified Fick equation

Answer 4

VO2 = CO * (CaO2 - CvO2)
Where VO2 is oxygen consumption (mL/min), CO is cardiac output (L/min), CaO2 is arterial oxygen content (mL/L), and CvO2 is mixed venous oxygen content (mL/L).