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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

If a patient normally has a 12 g/dLHb, cyanosis will likely appear when

A. 10 g/dLHb is saturated with oxygen

B. 9 g/dLHb is saturated with oxygen

C. 8 g/dLHb is saturated with oxygen

D. 7 g/dLHb is saturated with oxygen

Summary Introduction

Introduction:

Cyanosis is described as a purple discoloration of the skin, the mucous membrane, and the nails. These are the signs of cyanosis that occur during severe hypoxemia. Cold temperature can lead to the narrowing of blood vessels, which results in bluish skin. Warming and massaging can result in normal blood flow and bring color back to the skin.

Explanation

Explanation for the correct answer:

Option (D) is correct because cyanosis may appear when blood contains at least 5g/dL of reduced hemoglobin. As the patient has 12g/dL Hb, 7g/dL will most likely cause cyanosis. Hence, option (D) is correct.

Explanation for the incorrect answer:

Option (A) states that if the patient has 12 g/dL Hb, cyanosis can be seen when 10 g/dL Hb is saturated with oxygen. For cyanosis to appear, 5g/dL of reduced hemoglobin must be present. So, it is an incorrect option...

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