Formulas Part 4

Question 1

Poiseuilles Law

Answer 1

Q = 3.14 x Pr^4/8nL
Flow is directly relate to pressure
Length is directly relate to pressure
Viscosity is directly relate to pressure
Pressure is inversely proportional to the radius to the fourth power

Question 2

DO2 (Total Oxygen Delivery)

Answer 2

CO (Cardiac Output) x (CaO2 x 10)
CO= QT (Same thing)
Normal CO = 5 Lpm

Question 3

A-aO2 (Alveolar-arterial oxygen gradient)

Answer 3

PAO2 - PaO2
Normal: 5-10 mmHg
Gradient can increase with higher FiO2, ex: 100% FiO2, A-a gradient can be 100-150
Elevated A-aO2 indicates hypoxemia is due to V/Q mismatch, Shunt or impaired diffusion
Normal: Indicates the hypoxemia is due to hypoventilation (Elevated PaCO2) or low barometric pressure.

Question 4

DO2 Decrease

Answer 4

Low blood oxygenation
Low PaO2
Low SaO2
Low Hb concentration
Low Cardiac Output

Question 5

DO2 Increase

Answer 5

Increased PaO2
Increased SaO2
Increased Hb concentration
Increased Cardiac Output