cardiac physo review

Question 1

fick principle

Answer 1

CO= rate of O2 consumption/ ((O2 pulm vein) - (O2 pulm artery)) i.e. arteriovenous O2 difference

Question 2

MAP =

Answer 2

diastolic pressure x (1/3 pulse pressure) when HR is between 60 and 90 bpm

Mean arterial pressure = diastolic pressure + 1/3 pulse pressure = diastolic pressure + 1/3 (systolic pressure – diastolic pressure)

Question 3

compliance =

Answer 3

delta volume/ delta pressure

Question 4

Ohm’s law and its equivalencies

Answer 4

MAP = diastolic pressure x 1/3 pulse pressure = Q = P/V = CO = HR x SV = (mean arterial pressure - mean Right atrial pressure)/ TPR

Question 5

flow (eq 1) =

flow (eq 2)

Answer 5

change in volume / change in time

driving pressure x r^4/(8 viscosity x length))

Question 6

driving pressure =

Answer 6

flow x resistance (Ohm’s law)

Question 7

Reynold’s #

Answer 7

2rvp/viscosity

Question 8

Laplace’s law for thin walled tube

Answer 8

P = T/ r

Question 9

benoulli’s principle in words

Answer 9

where the fluid velocity is high, the pressure is low; where the fluid velocity is low, the pressure is high

as cross sectional area decreases, velocity increases, but pressure decreases

as the speed of a moving fluid (liquid or gas) increases, the pressure within the fluid decreases. … Since the speed is greater in the narrower pipe, the kinetic energy of that volume is greater.

Question 10

Ohm’s law, volumetric flow rate, and bernoulli’s law

Answer 10

Ohms: R = delat P/Q (flow)

volumetric flow rate = flow velocity x cross sectional area

bernoulli: resistance = (8ln)/((r^4)(pi)) ((i.e. velocity of a fluid is indirectly proportional to pressure)
summary:

delat P = Q x R= ((flow velocity x cross sectional area)) x bernoulli’s ((8nl/r^4 x pi))

Question 11

O2 content =

Answer 11

(O2 binding capacity x % O2 saturation) + dissolved O2 content