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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...
Atelectasis II: Pathophysiology01:10

Atelectasis II: Pathophysiology

Atelectasis develops when alveoli lose their air and collapse inward. Because lung tissue is naturally elastic, these air sacs shrink rather than remaining open. Collapsed alveoli are no longer ventilated, reducing their role in gas exchange. Blood flow may continue in these regions, creating a ventilation–perfusion mismatch. Clinical findings include decreased breath sounds, dullness to percussion, reduced chest expansion, and decreased tactile fremitus as sound transmission through collapsed...
Acute Respiratory Failure-III01:30

Acute Respiratory Failure-III

Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without causing...
Acute Respiratory Failure-I01:21

Acute Respiratory Failure-I

Acute respiratory failure is a condition characterized by the inability of the lungs to perform their primary function: gas exchange. This failure leads to insufficient oxygen levels (hypoxemia) in the blood, elevated carbon dioxide levels (hypercapnia), or both, causing critical impairment in organ function.
Definition: It is defined by specific criteria based on blood gas measurements. Hypoxemia happens when the partial pressure of oxygen (PaO2) falls below 60 mmHg. At the same time,...
Chronic Obstructive Pulmonary Disease II: Emphysema01:23

Chronic Obstructive Pulmonary Disease II: Emphysema

Emphysema, a major phenotype of chronic obstructive pulmonary disease (COPD), is characterized by irreversible destruction of alveolar walls and permanent enlargement of distal airspaces. Unlike chronic bronchitis, which primarily affects the airways, emphysema predominantly involves the lung parenchyma, where structural damage leads to airflow limitation.PathophysiologyIt most commonly results from prolonged exposure to cigarette smoke and other toxic gases, particularly cigarette smoke.

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Phenotyping Mouse Pulmonary Function In Vivo with the Lung Diffusing Capacity
07:13

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Published on: January 6, 2015

Rapid decrease in forced vital capacity in patients with idiopathic pulmonary upper lobe fibrosis.

Kentaro Watanabe1, Nobuhiko Nagata, Yasuhiko Kitasato

  • 1Department of Respiratory Medicine, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan. watanabe@fukuoka-u.ac.jp

Respiratory Investigation
|October 2, 2012
PubMed
Summary

Idiopathic pulmonary upper lobe fibrosis (IPUF) is a distinct interstitial pneumonia. This condition leads to rapid decline in lung function and has a poor prognosis.

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Area of Science:

  • Pulmonology
  • Pathology
  • Radiology

Background:

  • Idiopathic pulmonary upper lobe fibrosis (IPUF) is an unclassifiable interstitial pneumonia of unknown etiology.
  • IPUF does not fit into existing categories of idiopathic interstitial pneumonias (IIPs).

Purpose of the Study:

  • To investigate the clinical, functional, and pathological characteristics of IPUF.
  • To differentiate IPUF from other interstitial lung diseases.

Main Methods:

  • Evaluation of clinical and histological data from 9 patients with confirmed IPUF.
  • Measurement of baseline respiratory function, including forced vital capacity (FVC) monitoring over at least one year in 7 patients.

Main Results:

  • Patients were typically slender (BMI 16.0-19.8 kg/m²), with 7 reporting a history of pneumothorax.
  • Histological findings included intraalveolar collagen deposition and densely packed elastic fibers in subpleural areas.
  • A rapid, near-linear decline in FVC was observed, with a median yearly decline of -20.3%, exceeding that of other chronic fibrosing interstitial pneumonias.

Conclusions:

  • IPUF is a unique form of pulmonary fibrosis.
  • The condition is characterized by rapid deterioration of ventilatory function.
  • IPUF has a poor prognosis.