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Related Concept Videos

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:
Acute Respiratory Failure-IV01:23

Acute Respiratory Failure-IV

Respiratory failure can manifest suddenly or gradually, characterized by a rapid decline in PaO2 and a rapid rise in PaCO2. This situation indicates a severe respiratory problem that may quickly become a life-threatening emergency. One of the early signs of hypoxemic Acute Respiratory Failure (ARF) is a change in mental status due to the brain's sensitivity to oxygen levels and changes in acid-base balance. Symptoms such as restlessness, confusion, and agitation suggest inadequate oxygen...
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...
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...
Cardiomyopathy VII: Pre and Post Operative Nursing Management01:28

Cardiomyopathy VII: Pre and Post Operative Nursing Management

Patients with hypertrophic cardiomyopathy (HCM) and left ventricular outflow tract (LVOT) obstruction who remain symptomatic despite optimal medical therapy may undergo a septal myectomy (Morrow procedure). This procedure involves excising a portion of the hypertrophied septum below the aortic valve using a heart-lung machine to improve blood flow through the LVOT. Effective preoperative and postoperative nursing management ensures successful patient outcomes, minimizes complications, and...
Pulse Oximetry01:24

Pulse Oximetry

Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...

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Related Experiment Video

Updated: May 8, 2026

Standardized Hemorrhagic Shock Induction Guided by Cerebral Oximetry and Extended Hemodynamic Monitoring in Pigs
07:51

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Published on: May 21, 2019

Arterial hyperoxia during cardiopulmonary bypass and postoperative cognitive dysfunction.

Monique T Fontes1, David L McDonagh1, Barbara Phillips-Bute1

  • 1Department of Anesthesiology, Duke University Medical Center, Durham, NC.

Journal of Cardiothoracic and Vascular Anesthesia
|August 27, 2013
PubMed
Summary

Arterial hyperoxia during cardiopulmonary bypass (CPB) did not significantly impact neurocognitive function six weeks after cardiac surgery. This study found no association between high blood oxygen levels during CPB and cognitive decline in patients.

Keywords:
cardiac surgerycardiopulmonary bypasshyperoxianeurocognitive

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Area of Science:

  • Cardiovascular Surgery
  • Neuroscience
  • Anesthesiology

Background:

  • Postoperative neurocognitive dysfunction is a concern after cardiac surgery.
  • The role of arterial oxygen levels during cardiopulmonary bypass (CPB) remains unclear.

Purpose of the Study:

  • To investigate the association between arterial hyperoxia during CPB and neurocognitive function at 6 weeks post-surgery.
  • To test the hypothesis that hyperoxia during CPB contributes to cognitive decline.

Main Methods:

  • Retrospective analysis of 1018 patients undergoing coronary artery bypass graft (CABG) or CABG + valve surgery with CPB.
  • Neurocognitive assessments administered at baseline and 6 weeks post-surgery.
  • Multivariate regression analysis adjusted for multiple confounding factors.

Main Results:

  • Arterial hyperoxia, assessed by various metrics including partial pressure of oxygen (PaO2) and area under the curve (AUC), was not significantly associated with neurocognitive decline.
  • No correlation was found between hyperoxia during CPB and continuous change scores or dichotomous deficit rates in cognitive function.

Conclusions:

  • Arterial hyperoxia during cardiopulmonary bypass is not linked to neurocognitive decline 6 weeks after cardiac surgery.
  • Findings suggest that managing oxygen levels during CPB may not be a primary target for preventing cognitive impairment in this patient population.