Physiology Cardio Equations

P (pressure) =

Q (blood flow) x R (resistance)

What is Q (Flow) equivalent to / the same as?

CO (cardiac output)

Q (blood flow) = (P and R)

P (pressure) / R (resistance)

Q (blood flow) = (HR and SV)

HR (heart rate) x SV (stroke volume)

C (compliance) = (V and P)

∆V (change in volume) / ∆P (change in pressure)

C (compliance) = E

1/E (elasticity)

V (velocity) =

Q (flow) / A (area)

Re (reynolds number - the point turbulence occurs)

𝜌 (density) x d (diameter) x V (velocity) / 𝜂 (blood viscosity)

PP (pulse pressure) =

SAP (systolic arterial pressure) - DAP (diastolic arterial pressure)

MAP (mean arterial pressure) =

1/3PP (pulse pressure) + DAP (diastolic arterial pressure)

SV (stroke volume) =

EDV (end diastolic volume) - ESV (end systolic volume)

EF (ejection fraction) =

SV (stroke volume) / EDV (end diastolic volume)

P =

4 x V²

G (conductance)

1/R (resistance)

P (Pressure) = (Compliance, conductance)

[Q (flow) / G (conductance] + [Vs (stressed volume) / Cd (compliance)]

T (wall Tension) =

[P (pressure) x r (radius)] / 2H (wall tHickness)