# How do you calculate oxygen extraction ratio?

## How do you calculate oxygen extraction ratio?

In order to calculate this, one requires the cardiac output (from the PA catheter) and the oxygen content of the blood….The simple O2ER equation can be expressed as follows:

1. O2ER = VO2 / DO.
2. VO2 = CO ×(CaO2 – CvO2) this is the global oxygen consumption.
3. DO2 = CO ×CaO2 this is the global oxygen delivery.

How do you calculate DO2 VO2 ratio?

DO2 is the arterial content (12.3cc/dl) x 60dl/min = 738cc/O2/min. DO2/VO2 ratio is 3.64. The O2 content of native venous blood is the same as the drainage content (9cc/dL).

What is O2 consumption?

Oxygen consumption (V˙O 2) is the amount of oxygen taken in and used by the body per minute; thus, it is the rate of oxygen use. Alternately, it can be expressed as a function of body weight, frequently as milliliters of O 2 per kilogram of body weight per minute (milliliters per kilogram per minute).

### What does pa02 stand for?

An ABG measures: Partial pressure of oxygen (PaO2). This measures the pressure of oxygen dissolved in the blood and how well oxygen is able to move from the airspace of the lungs into the blood.

What is a normal CvO2?

CaO2 – CvO2 range from 13 to 74 ml l-1. The mean within-patient sd was 6.8 ml l-1 and the overall between-patient sd was 10.9 ml l-1.

What is O2 extraction?

Oxygen extraction ratio (O2ER) is a ratio of the body’s oxygen consumption (VO2) compared to the systemic oxygen delivery (DO2, formula below). A normal O2ER is ~25%. If oxygen delivery decreases, the O2ER increases as tissues extract more of the delivered oxygen.

#### What is VO2 and DO2?

global oxygen delivery (DO2) is the total amount of oxygen delivered to the tissues per minute, irrespective of the distribution of blood flow. oxygen consumption (VO2) is the total amount of oxygen removed from the blood due to tissue oxidative metabolism per minute.

What is oxygen extraction?

Oxygen extraction is, by definition, the difference between the arterial and venous concentrations of oxygen (CaO2-CvO2). Compared to most organs of the body (see table below), the oxygen extraction of the heart is relatively high.

What is O2 deficit?

There are many ways to define “oxygen deficit.” According to Dictionary.com, oxygen deficit is “the difference between oxygen intake of the body during early stages of exercise and during a similar duration in a steady state of exercise.” It is sometimes considered as the formation of oxygen debt.

## What is PaO2 SaO2 and SpO2?

SpO2 = oxygen saturation as measured by pulse oximeter. SaO2 = oxygen saturation as measured by blood analysis (e.g. a blood gas) PaO2 = partial pressure of oxygen in the blood, as measured by blood analysis. .dyspnea.

What is PaO2 in ABG?

An arterial blood gases (ABG) test measures the acidity (pH) and the levels of oxygen and carbon dioxide in the blood from an artery. Partial pressure of oxygen (PaO2). This measures the pressure of oxygen dissolved in the blood and how well oxygen is able to move from the airspace of the lungs into the blood.

How is CvO2 calculated?

B= blood. CvO2 depends on SvO2 and hemoglobin, 1 g of hemoglobin carries 1.36 mL of O2 (1.34mL – 1.39mL). Oxygen content equals the oxygen combined (with hemoglobin), usually ~ 97% and the Oxygen dissolved (in plasma), usually ~ 3%.

### What does o2er mean in oxygen extraction ratio?

Oxygen Extraction Ratio (O2ER) is the amount of oxygen extracted by the peripheral tissues (CaO2-CvO2) divided by the amount of oxygen delivered (CaO2) to the peripheral tissues. Normal O2ER is around 0.25 or 25%. O2ER: Oxygen Extraction Ratio.

What is the formula for oxygen to air entrainment ratio?

Oxygen-to-Air Entrainment Ratio (O2:Air) O2:Air = 1 : (100 – FiO2) / (FiO2 – 2) Arterial Oxygen Saturation Estimation (SaO2) SaO2 = PaO2 + 30

What is the formula for global oxygen consumption and delivery?

VO 2 = CO × (CaO 2 – CvO 2 ) …this is the global oxygen consumption DO 2 = CO ×CaO 2 …this is the global oxygen delivery. In order to calculate this, one requires the cardiac output (from the PA catheter) and the oxygen content of the blood.

#### How do you calculate Oi and VO2?

Oxygenation Index (OI) OI = ((Paw x FiO2) / PaO2) x 100 Oxygen Consumption (VO2) VO2 = Cardiac Output x C(a-v)O2