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Related Concept Videos

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure01:16

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure

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, improving...
Hypoxia01:23

Hypoxia

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:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Physiological Control of Respiration01:23

Physiological Control of Respiration

Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

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,...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

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:
Factors Affecting Respiration01:24

Factors Affecting Respiration

Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:

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Related Experiment Video

Updated: Jul 14, 2026

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
08:44

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

Published on: February 2, 2024

Human cardiovascular dose-response to supplemental oxygen.

Z Bak1, F Sjöberg, A Rousseau

  • 1Department of Anesthesia and Intensive Care, and Departments of Hand and Plastic Surgery and Burn Intensive Care, University Hospital, Linköping, Sweden.

Acta Physiologica (Oxford, England)
|May 18, 2007
PubMed
Summary

Increasing supplemental oxygen linearly reduces left ventricular stroke volume and cardiac output in healthy individuals. This suggests oxygen directly affects cardiovascular function, potentially by increasing vascular resistance and pooling blood in veins.

More Related Videos

A Model to Simulate Clinically Relevant Hypoxia in Humans
09:54

A Model to Simulate Clinically Relevant Hypoxia in Humans

Published on: December 22, 2016

Related Experiment Videos

Last Updated: Jul 14, 2026

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
08:44

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

Published on: February 2, 2024

A Model to Simulate Clinically Relevant Hypoxia in Humans
09:54

A Model to Simulate Clinically Relevant Hypoxia in Humans

Published on: December 22, 2016

Area of Science:

  • Cardiovascular Physiology
  • Respiratory Physiology

Background:

  • Hyperoxemia, the condition of elevated arterial oxygen levels, can influence cardiovascular function.
  • Understanding the cardiovascular adaptations to hyperoxemia is crucial for clinical applications.

Purpose of the Study:

  • To investigate central and peripheral cardiovascular adaptations during increasing levels of hyperoxemia.
  • To determine the dose-response relationship between hyperoxemia and left ventricular performance and arterial properties.

Main Methods:

  • Non-invasive assessment using echocardiography and impedance cardiography.
  • Measurement of left ventricular volumes, aortic pressure, and flow in healthy volunteers.
  • Data collection under controlled hyperoxemic conditions (20, 40, 60 kPa oxygen tension).

Main Results:

  • Left ventricular stroke volume and end-diastolic area significantly decreased with increasing oxygen levels.
  • A linear, negative dose-response relationship was observed between arterial oxygen and stroke volume.
  • Peripheral resistance and characteristic impedance increased, while heart rate and arterial compliance remained unchanged.

Conclusions:

  • A linear relationship exists between arterial oxygen levels and cardiovascular parameters above normal physiological ranges.
  • Supplemental oxygen may have a direct vasodilatory or vasoconstrictive effect on vascular properties.
  • Hyperoxemia leads to increased proximal aortic and peripheral resistance, with decreased venous return and potential blood pooling in capacitance vessels.