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Related Concept Videos

Oxygen Requirements and Growth Patterns01:29

Oxygen Requirements and Growth Patterns

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Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
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Oxygen Transport in the Blood01:27

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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure01:16

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure

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Oxygen therapy has emerged as a significant tool in enhancing the quality of life for patients suffering from pulmonary arterial hypertension (PAH). While this therapy has principally been studied on patients with significant hypoxemia, this therapeutic approach helps prevent potential organ damage and can be administered in the comfort of one's home.
Oxygen therapy is vital in increasing and maintaining blood oxygen levels in PAH patients. As a result, it aids in reducing fatigue,...
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Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
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Respiratory Assessment: Purpose and Indications01:19

Respiratory Assessment: Purpose and Indications

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Respiratory assessment is a cornerstone of nursing assessments, crucial for the early detection of patient deterioration. This evaluation transcends routine procedures, representing a critical skill nurses must master to ensure optimal patient care.
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...
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Hypoxia01:23

Hypoxia

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Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
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Related Experiment Video

Updated: Nov 3, 2025

How to Administer Near-Infrared Spectroscopy in Critically ill Neonates, Infants, and Children
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Oxygen Toxicity in Critically Ill Adults.

Chad H Hochberg1, Matthew W Semler2, Roy G Brower1

  • 1Department of Pulmonary and Critical Care Medicine, School of Medicine, Johns Hopkins University, Baltimore, Maryland; and.

American Journal of Respiratory and Critical Care Medicine
|June 4, 2021
PubMed
Summary

Optimal oxygen levels for critically ill adults remain uncertain. Recent large trials suggest conservative or liberal oxygen targets yield similar outcomes, though research continues for specific patient groups.

Keywords:
ICUshyperoxiaoxygen inhalational therapy

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Area of Science:

  • Critical Care Medicine
  • Pulmonary Medicine
  • Clinical Research

Background:

  • Supplemental oxygen is a common intervention in critical care.
  • Optimal oxygenation targets in critically ill adults are not well-defined.
  • Historical data suggests potential harm from high oxygen concentrations.

Purpose of the Study:

  • To review the evidence on optimal arterial oxygenation targets in critically ill adult patients.
  • To evaluate the impact of different oxygenation strategies on patient outcomes.
  • To identify areas for future research in oxygen therapy.

Main Methods:

  • Review of laboratory animal studies, human autopsy data, and observational studies.
  • Analysis of recent randomized clinical trials comparing conservative versus liberal oxygen targets.
  • Examination of outcomes in specific patient subpopulations.

Main Results:

  • Animal studies show harm from high oxygen; human autopsy findings are confounded.
  • Observational studies on mortality association with high oxygen are inconsistent.
  • Largest RCTs found no difference in outcomes between conservative and liberal oxygen targets.

Conclusions:

  • Current evidence suggests both conservative and liberal oxygen targeting strategies may be reasonable for critically ill adults.
  • Further research is needed to determine optimal oxygen strategies for specific patient subpopulations.
  • Given the widespread use of oxygen, even small effects could have significant global impact.