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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.
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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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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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COPD is defined as a heterogeneous lung condition marked by persistent respiratory symptoms such as dyspnea, cough, and sputum production, caused by abnormalities in the airways that cause airflow obstruction.
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Related Experiment Video

Updated: Sep 22, 2025

Oxygenation-sensitive Cardiac MRI with Vasoactive Breathing Maneuvers for the Non-invasive Assessment of Coronary Microvascular Dysfunction
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Unexplained hypoxemia in COPD with cardiac shunt.

Rino Frizzelli1, Corrado Lettieri2, Simone Caiola1

  • 1Division of Internal Medicine and Setting of Cardiopulmonary Monitoring, ASST Carlo Poma - Mantova, Italy.

Respiratory Medicine Case Reports
|May 19, 2022
PubMed
Summary

In Chronic Obstructive Pulmonary Disease (COPD), patent foramen ovale (PFO) closure can correct refractory hypoxemia. This case report highlights PFO closure as a novel therapeutic target for improving COPD patient outcomes.

Keywords:
COPDCardiac shuntHypoxemiaPFO

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Area of Science:

  • Pulmonary Medicine
  • Cardiology
  • Medical Diagnostics

Background:

  • Hypoxemia in Chronic Obstructive Pulmonary Disease (COPD) is often linked to ventilation-perfusion (V/Q) mismatch, treatable with oxygen therapy.
  • Refractory hypoxemia, even with high oxygen concentrations, may indicate cardiac defects like patent foramen ovale (PFO) with a right-to-left (R-T-L) shunt.
  • Diagnosing PFO in COPD patients requires high clinical suspicion and ruling out other causes, with platypnea-orthodeoxia and lack of hyperoxia test response increasing suspicion.

Observation:

  • Transthoracic echocardiogram and contrast transesophageal echocardiography are crucial for confirming PFO.
  • No prior data supported PFO closure effectiveness in COPD patients for symptom relief or hypoxemia correction.
  • A case of hypoxemic COPD with platypnea-orthodeoxia syndrome due to PFO was identified.

Findings:

  • Device closure of PFO, following echocardiographic assessment of right ventricular function, completely resolved refractory hypoxemia.
  • The patient experienced significant improvements in SpO2 levels and functional capacity post-PFO closure.
  • This intervention demonstrated the potential of PFO closure to address hypoxemia in selected COPD patients.

Implications:

  • PFO closure presents a novel therapeutic target for COPD patients with refractory hypoxemia.
  • Successful PFO closure can lead to improved quality of life and reduced hospitalization rates in select COPD patients.
  • Further research is warranted to establish the long-term efficacy and patient selection criteria for PFO closure in COPD management.