Lack of oxygen in tissues is called as:

IGNOU PB Bsc Entrance-2022

Applied Physiology

Easy

Appeared in: IGNOU PB Bsc Entrance-2022

Explanation

Anoxia is the most precise medical term for the complete or near-complete absence of oxygen supply at the tissue level.
It is the most severe form of hypoxia, which is broadly defined as inadequate tissue oxygenation.
The question specifically asks about the condition in the 'tissues', making Anoxia a more accurate choice than terms referring to blood (Anoxaemia) or the entire body's gas exchange (Asphyxia).

Option A: Asphyxia is a condition of impaired breathing that leads to both a lack of oxygen (hypoxemia) and an excess of carbon dioxide (hypercapnia). It describes the cause of oxygen deprivation rather than the state of the tissues themselves.
Option B: Cyanosis is not the condition itself but a clinical sign. It is the bluish discoloration of the skin and mucous membranes that results from an increased amount of deoxygenated hemoglobin in the blood.
Option D: Anoxaemia, more commonly known as hypoxemia, refers to a deficiency of oxygen in the arterial blood. The question specifically asks about the condition in the tissues, not the blood.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Differentiation of medical terms related to oxygen deprivation as background academic context rather than a clinical decision trigger.
Accurate terminology is crucial for precise documentation and communication. Confusing hypoxemia (in blood) with hypoxia/anoxia (in tissues) can lead to misinterpretation of a patient's status and delayed intervention.
Nurses must monitor for early signs of hypoxia, such as restlessness, anxiety, and confusion, because cyanosis is an unreliable and late sign of oxygen deprivation.
What if? If a patient has carbon monoxide poisoning, their pulse oximeter reading (SpO2) might be falsely normal, but they can have severe tissue anoxia. This is because CO binds to hemoglobin more strongly than oxygen, but the oximeter cannot differentiate between oxyhemoglobin and carboxyhemoglobin. This requires immediate high-flow oxygen and different diagnostic tests like a CO-oximeter.

How to Approach the Question

First, identify the key terms in the question stem: 'Lack of oxygen' and 'in tissues'.
Next, analyze the options by breaking down the medical prefixes and suffixes. 'An-' means without, '-oxia' refers to oxygen, and '-emia' refers to blood.
Evaluate each option against the keywords. 'Anoxia' directly translates to 'without oxygen'.
Differentiate based on the location specified. 'Anoxaemia' refers to the blood, while the question specifies 'tissues'.
Distinguish between a physiological state (Anoxia), a causative condition (Asphyxia), and a clinical sign (Cyanosis) to select the most precise answer.

Concept Tested & Keywords

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