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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...
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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...
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Halogenated Agent Delivery in Porcine Model of Acute Respiratory Distress Syndrome via an Intensive Care Unit Type Device
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THE RAPID SHALLOW BREATHING RESULTING FROM PULMONARY CONGESTION AND EDEMA.

E D Churchill1, O Cope

  • 1Surgical Laboratories, Massachusetts General Hospital, Boston.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Experimental pulmonary congestion and edema in an isolated lung triggered vagal nerve responses, including slowed heart rate and decreased blood pressure. These findings support the nerve stimulation hypothesis for rapid shallow breathing during lung congestion.

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Last Updated: Jun 19, 2026

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09:36

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Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome (ARDS)
06:22

Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome (ARDS)

Published on: April 7, 2021

Area of Science:

  • Physiology
  • Cardiovascular System
  • Respiratory System

Background:

  • Pulmonary congestion and edema can significantly impact physiological functions.
  • Previous studies suggest a link between lung embolism and respiratory changes.

Purpose of the Study:

  • To investigate the physiological effects of experimentally induced pulmonary congestion and edema in an isolated lung with intact innervation.
  • To elucidate the role of lung nerve endings in respiratory responses to congestion.

Main Methods:

  • Induction of pulmonary congestion and edema in an isolated lung preparation.
  • Monitoring of heart rate, systemic blood pressure, and respiratory patterns.
  • Analysis of physiological changes in response to lung manipulation.

Main Results:

  • Induced pulmonary congestion and edema led to decreased heart rate and systemic blood pressure, characteristic of vagal nerve stimulation.
  • Respiration was temporarily inhibited, followed by rapid, shallow breathing.
  • Cardiovascular parameters returned to baseline spontaneously, while respiratory changes were only partially reversed.

Conclusions:

  • The observed cardiovascular changes indicate vagal nerve stimulation.
  • The respiratory alterations suggest that rapid, shallow breathing during lung congestion is mediated by the stimulation of nerve endings within the lungs.
  • These findings support the hypothesis that lung nerve stimulation plays a key role in the respiratory response to pulmonary congestion and edema.