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Related Concept Videos

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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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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Physiological Control of Respiration01:23

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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
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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%.
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Pulmonary Hypertension: Classification and Pathogenesis01:30

Pulmonary Hypertension: Classification and Pathogenesis

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Pulmonary hypertension (PH) is a severe health condition in which the mean pulmonary arterial pressure increases to 25 mmHg or more, even when the body is at rest. This high pressure in the blood vessels that transport blood from the heart to the lungs can cause various symptoms, including shortness of breath, can lead to right heart failure, and significantly affect the overall quality of life.
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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...
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Related Experiment Video

Updated: Mar 7, 2026

Videomorphometric Analysis of Hypoxic Pulmonary Vasoconstriction of Intra-pulmonary Arteries Using Murine Precision Cut Lung Slices
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Videomorphometric Analysis of Hypoxic Pulmonary Vasoconstriction of Intra-pulmonary Arteries Using Murine Precision Cut Lung Slices

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Hypoxic Pulmonary Vasoconstriction in Humans: Tale or Myth.

A Hussain1, M S Suleiman2, S J George2

  • 1Department of Cardiothoracic Surgery, Castle Hill Hospital, Castle Road, Cottingham, HU16 5JQ, UK.

The Open Cardiovascular Medicine Journal
|February 21, 2017
PubMed
Summary
This summary is machine-generated.

Hypoxic pulmonary vasoconstriction (HPV) is a lung adaptation preserving oxygen. This review explores acute and chronic HPV mechanisms, crucial for understanding pulmonary hypertension and improving cardiothoracic surgery outcomes.

Keywords:
Acute hypoxiaChronic hypoxiaHumanHypoxic Pulmonary VasoconstrictionPulmonary hypertension

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Area of Science:

  • Physiology
  • Pulmonary Medicine
  • Cardiothoracic Surgery

Background:

  • Hypoxic pulmonary vasoconstriction (HPV) is a vital lung function for maintaining systemic oxygenation.
  • Dysregulation of HPV is implicated in pulmonary hypertension, affecting patient outcomes in cardiothoracic surgery.

Purpose of the Study:

  • To review the distinct mechanisms of acute and chronic HPV.
  • To explore the clinical implications of HPV in pulmonary hypertension and cardiothoracic surgery.
  • To identify knowledge gaps and future research directions in human HPV.

Main Methods:

  • Literature review focusing on acute and chronic HPV.
  • Analysis of the roles of calcium, mitochondria, reactive oxygen species, and Rho GTPases in HPV.
  • Examination of clinical relevance in pulmonary hypertension and cardiothoracic surgery.

Main Results:

  • Acute HPV involves calcium and mitochondria.
  • Chronic HPV is associated with reactive oxygen species and Rho GTPases.
  • Understanding these mechanisms is critical for managing pulmonary hypertension.

Conclusions:

  • Distinct molecular pathways differentiate acute and chronic HPV.
  • Further human research is needed to fully elucidate HPV mechanisms and therapeutic targets.
  • Targeting HPV pathways may improve outcomes for patients with pulmonary hypertension and undergoing cardiothoracic surgery.