Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

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

The half-life of carboxyhemoglobin (COHb) when a victim is breathing room air at 1 atm is approximately

A. 2 hours

B. 3 hours

C. 4 hours

D. 5 hours

Summary Introduction


The pathological conditions that are related to a low level of oxygen are treated with the administration of 100% oxygen at an increased pressure. This kind of therapeutic treatment is known as hyperbaric medicine. The patients are subjected to a hyperbaric chamber, which helps in increasing the level of oxygen in the body tissues.


Explanation for the correct answer:

Option (d) is given as 5 hours. The half-life of carboxyhemoglobin, when administered to the victim at 1 atm, is approximately 5 hours. Hyperbaric oxygen, when administered at first, increases the dissolved O2 in the arterial blood. It also helps in increasing the pressure gradient into ischemic tissues and finally, the half-life of carboxyhemoglobin is reduced. Hence, option (d) is the correct answer.

Explanation for the incorrect answer:

Option (a) is given as 2 hours

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