Cardiophys Equations Flashcards

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1
Q

Mean Arterial Pressure Equations

A

MAP = (CO X SVR) + CVP

MAP = Pd + (1/3 X PP)

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2
Q

Systemic Vascular Resistance

A

SVR = (MAP - RAP)/ CO

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3
Q

Pulmonary Vascular Resistance (2 equations)

A
  1. (MPAP - LAP) / CO
  2. (MPAP - PAWP) / CO
    * PAWP = LAP
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4
Q

Oncotic Pressure

A

Po = σTRCp

σ = Reflection coefficient
Water = 0; Albumin = 1
R = Gas constant
T = Temperature
CRP = Plasma solute concentration
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5
Q

Capillary Fluid movement (Starling Forces)

A

QF = k[(Pc - Pi) - (πp - πi)]

K = Filtration Constant
P = Hydrostatic Pressure
π = Oncotic Pressure
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6
Q

Resistance relation to length and radius.

A

R = l/r^4

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7
Q

Perfusion

A

dP = Pu - Pd

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8
Q

Transmural pressure

A

DP = Pi - Po

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9
Q

Reynolds Number

A

NR = ρDv/ η

Or Density X Diameter X meanvelocity / viscosity

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10
Q

Shear Stress

A

τ = 4ηQ/πr^3

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11
Q

Velocity as it relates to flow and SA

A

v = Q/A

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12
Q

Poiseuille (Flow in a tube)

A

Q = πPr^4/8ηl
Or…
R = 8ηl/ πr^4

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13
Q

Resistance in a tube

A

R = 8ηl/ πr^4

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14
Q

Resistance in series

A

RT = RA + Ra +Rc + Rv + RV

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15
Q

Resistance in Parallel.

A

Rx = 1/ (1/R1 + 1/R2 + 1/R3)

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16
Q

Compliance

A

DV/dP

17
Q

Laplace’s Law

A

T = Pxr/2xu

18
Q

Ventricular Wall Stress

A

σ = Pxr/h

P = Ventricular pressure
R = radius
H = thickness