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Related Concept Videos

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...
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:
Respiratory Assessment: Purpose and Indications01:19

Respiratory Assessment: Purpose and Indications

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...
Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
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,...

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Related Experiment Video

Updated: Jun 1, 2026

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

["On and off" hypoxaemia].

E Magois1, P Aubry, C Andrejak

  • 1Unité de Réanimation Respiratoire, Service de Pneumologie, CHU Sud, Avenue René-Laennec, 80054 Amiens cedex 1, France. Magois.Eline@chu-amiens.fr

Revue Des Maladies Respiratoires
|June 8, 2011
PubMed
Summary
This summary is machine-generated.

Diagnosing a patent foramen ovale (PFO) can be challenging. Repeating saline contrast echocardiography in an upright position is crucial for detecting right-to-left shunts, especially when supine tests are normal.

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Area of Science:

  • Cardiology
  • Diagnostic Imaging

Background:

  • Platypnoea-orthodeoxia syndrome necessitates consideration of right-to-left shunts, often attributed to patent foramen ovale (PFO).
  • Saline contrast transthoracic or transoesophageal echocardiography is the primary diagnostic tool for PFO.

Observation:

  • An eighty-year-old woman presented with platypnoea-orthodeoxia syndrome but initially showed no signs of a right-to-left shunt via PFO.
  • Standard supine lung scintigraphy and echocardiography were normal, despite strong clinical suspicion of PFO.

Findings:

  • Repeating imaging in the upright position revealed a right-to-left shunt.
  • This shunt was caused by an aneurysm of the ascending aorta displacing the interatrial septum, allowing blood flow from the inferior vena cava through a PFO into the left atrium.

Implications:

  • Diagnosis of PFO can be difficult, underscoring the importance of repeat saline contrast echocardiography in the upright position if supine tests are negative.
  • Contrast infusion via femoral veins can confirm PFO diagnosis when standard methods are inconclusive.