Oxygen Delivery Quiz

Questions and Answers

What's the equation for DO2?

DO2 = Cardiac Output x [(Hgb x SaO2 x 1.34) + (PaO2 x 0.003)] x 10

To understand the essence of DO2, what are the two questions we need to ask?

How much oxygen is in the blood? 2. How fast is the oxygen being delivered to the tissues?

Remember the amount of gas dissolved in a solution follows ________ law.

Henry's law

What is the normal DO2?

1000 mL/min Signup and view all the answers

What is the normal oxygen extraction?

250 mL/min Signup and view all the answers

What is the whole body O2 extraction ratio?

25% Signup and view all the answers

___________ tells us how many grams per deciliter of oxygen are contained in the blood.

CaO2 Signup and view all the answers

What is the solubility coefficient for dissolved oxygen in the blood?

0.003 Signup and view all the answers

Myocardial function is determined by what 3 things?

Preload, afterload, and contractility Signup and view all the answers

What does the Oxygen Carrying Capacity: CaO2 tell you, and what is the reference value?

It tells how much O2 is carried in the arterial blood. Reference value = 20 mL/dL Signup and view all the answers

What does Oxygen Delivery: DO2 tell you, and what is the reference value?

It tells how much O2 is carried in the blood & how fast it is being delivered to the tissues. Reference value = 1000 mL/min Signup and view all the answers

What does Oxygen Extraction Ratio: EO2 tell you, and what is the reference value?

It tells how much O2 is extracted by the tissues. Reference value for whole body = 25% Signup and view all the answers

What does Oxygen Consumption: VO2 tell you, and what is the reference value?

It tells how much oxygen is consumed by the tissues. Reference value = 250 mL/min (this value is at rest) Signup and view all the answers

What does Venous Oxygen Content: CvO2 tell you, and what is the reference value?

It tells how much O2 is carried in the venous blood. Reference value = 15 mL/dL Signup and view all the answers

Study Notes

Oxygen Delivery Overview

DO2 equation: DO2 = Cardiac Output x [(Hgb x SaO2 x 1.34) + (PaO2 x 0.003)] x 10
- Brackets signify oxygen carrying capacity (CaO2).
- The factor 10 adjusts units (Hgb in g/dL and CO in L/min).
- Example: If CO = 5 L/min and CaO2 = 20 mL/dL, then DO2 = 1,000 mL O2/min.

Key Questions About DO2

Essential questions:
- How much oxygen is in the blood?
- How fast is the oxygen being delivered to the tissues?

Gas Dissolution Law

The amount of gas dissolved in a solution follows Henry's law.

Normal Values

Normal DO2: 1,000 mL/min
Normal oxygen extraction: 250 mL/min
Whole body O2 extraction ratio: 25%.

Oxygen Carrying Capacity

CaO2 indicates grams of oxygen per deciliter in blood.
Reference value for CaO2: 20 mL/dL.

Oxygen Delivery Characteristics

DO2 measures how much O2 is carried in the blood and its delivery speed.
Reference value for DO2: 1,000 mL/min.

Oxygen Extraction and Consumption

EO2 reflects how much O2 is extracted by tissues.
Whole body reference value for EO2: 25%.
VO2 measures oxygen consumed by tissues at rest.
Reference value for VO2: 250 mL/min.

Venous Oxygen Content

CvO2 indicates O2 carried in venous blood.
Reference value for CvO2: 15 mL/dL.

Myocardial Function Determinants

Three factors influencing myocardial function:
- Preload
- Afterload
- Contractility.

Solubility of Oxygen

The solubility coefficient for dissolved oxygen in the blood is 0.003.

Description

Test your knowledge on oxygen delivery equations and concepts. This quiz covers key calculations and understanding of DO2, focusing on cardiac output and oxygen carrying capacity. Perfect for students in physiology or medicine.