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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

Case 1

As a result of the excessive blood loss, the patient's Pa o 2 of 503 mm Hg and Sa o 2 of 98 percent were very misleading. Which oxygen transport studies verified this fact?

Summary Introduction

To review:

The oxygen transport studies that verified the patient’s PaO2 and SaO2 values were misleading in the given case.

Introduction:

SaO2 is defined as the amount of haemoglobin that is saturated with oxygen and PaO2 is defined as the pressure of oxygen in the arterial blood. The oxygen transport study gives us information about the total oxygen delivery (Do2), oxygen consumption (Vo2) and oxygen extraction ratio (O2ER).

Please refer to Clinical Application Case-1 for further information.

Explanation

Total oxygen delivery is known as the amount of oxygen that can be transported to the peripheral tissues. Oxygen consumption is defined as the amount of oxygen extracted from the peripheral tissues. The ratio of both of them is the oxygen extraction ratio. In this case, her Do2 was only 316 mL (millilitres), and Vo2 was 214 mL/min. It means that the patient was consuming 214 mL of oxygen out of 316 mL, that is, 68% (percent) consumption and the reserve oxygen was only 30%, which could be life threatening

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