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Related Concept Videos

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...
Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

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...
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,...
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
Alterations in Respiration II01:30

Alterations in Respiration II

There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
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:

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Related Experiment Video

Updated: Jun 27, 2026

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
07:52

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department

Published on: January 29, 2011

Permissive hypercapnia.

Alex Rogovik1, Ran Goldman

  • 1Pediatric Research in Emergency Therapeutics (PRETx) Program, Division of Pediatric Emergency Medicine, Ambulatory Care Building, BC Children's Hospital, 4480 Oak Street, Vancouver, BC, Canada.

Emergency Medicine Clinics of North America
|December 9, 2008
PubMed
Summary

High tidal volume ventilation can harm lungs. Permissive hypercapnia, using low volumes and pressure, is a safe protective strategy for acute respiratory failure in all patient groups.

Area of Science:

  • Critical care medicine
  • Pulmonary medicine
  • Mechanical ventilation

Background:

  • High tidal volume (VT) and transpulmonary pressure during mechanical ventilation can cause lung damage, known as ventilator-induced lung injury (VILI).
  • Protective ventilatory strategies aim to minimize VILI.

Purpose of the Study:

  • To highlight the role and acceptance of permissive hypercapnia as a key component of protective mechanical ventilation.

Main Methods:

  • This section is not detailed in the provided abstract.

Main Results:

  • Permissive hypercapnia is increasingly accepted in critical care settings.
  • It is applied across adult, pediatric, and neonatal patient populations.

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Evaluation of Capnography Sampling Line Compatibility and Accuracy when Used with a Portable Capnography Monitor

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MRI Mapping of Cerebrovascular Reactivity via Gas Inhalation Challenges
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MRI Mapping of Cerebrovascular Reactivity via Gas Inhalation Challenges

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Last Updated: Jun 27, 2026

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
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Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department

Published on: January 29, 2011

Evaluation of Capnography Sampling Line Compatibility and Accuracy when Used with a Portable Capnography Monitor
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Evaluation of Capnography Sampling Line Compatibility and Accuracy when Used with a Portable Capnography Monitor

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Conclusions:

  • Permissive hypercapnia, characterized by low inspiratory volume and pressure, is a central element of current protective ventilatory strategies.
  • Its progressive adoption underscores its value in managing acute respiratory failure while minimizing lung injury.