A lack of oxygen in blood is called?

AIIMS BBSR SNO - 2019

Medical Surgical Nursing

Easy

Appeared in: AIIMS BBSR SNO - 2019

Explanation

Hypoxaemia is the medical term for a condition characterized by an abnormally low level of oxygen in the arterial blood.
It is specifically a measure of the partial pressure of oxygen (PaO₂) in the blood, which can lead to tissue hypoxia (inadequate oxygen at the tissue level) if not corrected.
The term is derived from Greek roots: 'hypo-' (low), 'ox-' (oxygen), and '-aemia' (in the blood), literally meaning low oxygen in the blood.

Option A: Stridor is an audible, high-pitched breath sound resulting from turbulent airflow in a narrowed upper airway. It is a clinical sign of obstruction, not a condition related to blood gas levels.
Option C: Hypercapnia refers to an abnormally high level of carbon dioxide (CO₂) in the blood. It is the opposite of what the question asks, as it deals with excess CO₂ rather than a lack of oxygen.
Option D: Orthopnoea is a clinical symptom, not a physiological measurement of blood gases. It describes shortness of breath that occurs when a person is lying flat, forcing them to sit or stand up to breathe more easily.

Clinical Relevance

Nursing practice connection: Knowing Definition of Hypoxaemia and related respiratory terms helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must rapidly identify signs of hypoxaemia (e.g., cyanosis, confusion, tachycardia) and monitor oxygen saturation (SpO₂) using a pulse oximeter, as it can indicate serious respiratory or cardiovascular compromise.
A normal SpO₂ is 95-100%. A value below 90% is a clinical emergency requiring immediate intervention, such as administering supplemental oxygen and notifying the provider.
What if? If a patient has an SpO₂ of 92% and is already on 2L of oxygen via nasal cannula, the nurse's first action would be to assess the patient's overall respiratory status (rate, effort, lung sounds), ensure the equipment is functioning correctly, and reposition the patient (e.g., sitting upright) before considering an increase in oxygen flow as per protocol.

How to Approach the Question

First, identify the key phrases in the question: 'lack of oxygen' and 'in blood'. This points to a specific physiological state.
Next, analyze the medical terminology of each option by breaking it down into its root components. For example, 'hypo-' means low, 'hyper-' means high, '-ox-' refers to oxygen, '-capn-' refers to carbon dioxide, and '-aemia' means 'in the blood'.
Apply this breakdown: 'Hypoxaemia' directly translates to 'low oxygen in the blood', matching the question perfectly.
Evaluate the other options to confirm they are incorrect. Stridor is a sound, Hypercapnia is about high CO₂, and Orthopnoea is a positional breathing symptom. This process of elimination confirms the correct choice.

Concept Tested & Keywords

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