Related Experiment Video
Updated: May 21, 2026
08:58
Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence
Published on: May 4, 2011
[Brain tissue oxygen pressure, for what, for whom?].
A Tran-Dinh1, F Depret, B Vigué
1Département d'anesthésie-réanimation, CHU de Bicêtre, AP-HP, 94275 Le Kremlin-Bicêtre, France.
Annales Francaises D'Anesthesie Et De Reanimation
|June 16, 2012
Summary
Brain oxygen partial pressure (PtiO(2)) monitoring helps detect regional cerebral ischemia, which global measures miss. This technique offers valuable insights for improving neurointensive care and patient outcomes.
Area of Science:
- Neuroscience
- Critical Care Medicine
- Physiology
Context:
- Cerebral ischemia, a critical concern in neurointensive care, arises from an imbalance between oxygen/glucose supply and demand.
- Current global monitoring methods like cerebral perfusion pressure (CPP) are insufficient for detecting localized ischemia.
- Regional monitoring, exemplified by brain oxygen partial pressure (PtiO(2)), has emerged to address this limitation.
Purpose:
- To evaluate the role and significance of brain oxygen partial pressure (PtiO(2)) monitoring in neurointensive care.
- To explore PtiO(2) as an indicator of cerebral oxygen diffusion, influenced by arterial oxygen pressure (PaO(2)) and local cerebral blood flow (CBF).
- To assess the potential of PtiO(2)-guided management in optimizing cerebral tissue oxygenation and patient prognosis.
Summary:
- PtiO(2) measures oxygen levels in a small volume of brain tissue, with normal values between 25-35 mmHg and a critical ischemic threshold of 10 mmHg.
- PtiO(2) reflects oxygen diffusion dynamics and can identify regional ischemia even when intracranial pressure (ICP) is normal, such as during hypocapnia-induced vasoconstriction.
- Management guided by PtiO(2) can optimize oxygen transport, and prolonged low PtiO(2) values are associated with poor neurological outcomes, suggesting prognostic value.
Impact:
- PtiO(2) offers crucial additional information for regional cerebral ischemia monitoring, complementing global assessments.
- Increased utilization of PtiO(2) monitoring can enhance understanding of cerebral ischemia.
- PtiO(2) monitoring holds the potential to significantly improve neurointensive care management and patient outcomes.
Related Concept Videos
01:27Oxygen 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,...
01:14Increased Intracranial Pressure l: Introduction
Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component expands, CSF and venous blood...
01:29Increased Intracranial Pressure ll: Pathophysiology
Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
00:49The Blood-brain Barrier
Overview
01:23Physiological 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...
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...
01:23Hypoxia
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...
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...