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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...
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...
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,...
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...
Diagnosing Acidosis and Alkalosis01:24

Diagnosing Acidosis and Alkalosis

Diagnosing acid-base imbalances involves systematically analyzing arterial blood samples, focusing on three key measurements: pH, bicarbonate (HCO3−) concentration, and carbon dioxide partial pressure (PCO2). This analysis follows a four-step process that helps identify the imbalance's underlying cause and nature.
First, the pH level is assessed to determine whether the blood pH is normal (7.35–7.45), low (acidosis), or high (alkalosis).
Next, the PCO2  and HCO3−  values are examined to...
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: Jul 3, 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

Hypercapnia and the neonate.

Robert P Jankov1, A Keith Tanswell

  • 1Department of Paediatric, University of Toronto, Toronto, Ontario Canada. robert.jankov@sunnybrook.ca

Acta Paediatrica (Oslo, Norway : 1992)
|July 17, 2008
PubMed
Summary
This summary is machine-generated.

Permissive hypercapnia, now termed therapeutic hypercapnia, may protect neonates by improving oxygen delivery. However, optimal safe carbon dioxide levels for vulnerable infants remain undetermined.

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Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
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Evaluation of Capnography Sampling Line Compatibility and Accuracy when Used with a Portable Capnography Monitor

Published on: September 29, 2020

Area of Science:

  • Neonatal Intensive Care
  • Pediatric Respiratory Medicine
  • Critical Care Medicine

Background:

  • Permissive hypercapnia is used in neonatal intensive care with low-tidal-volume ventilation to reduce respiratory morbidity.
  • Emerging evidence suggests hypercapnic acidosis may offer protective effects for organs.
  • This has led to the concept of 'therapeutic hypercapnia', including supplemental inspired CO(2).

Purpose of the Study:

  • To explore the protective effects of hypercapnia in neonatal care.
  • To define the potential benefits and risks of therapeutic hypercapnia.

Main Methods:

  • Review of experimental evidence on hypercapnia's effects.
  • Analysis of physiological impacts on immature organs.

Main Results:

  • Mild-moderate hypercapnia may enhance tissue oxygenation and perfusion.
  • Potential amelioration of injury to the neonatal lung and brain.

Conclusions:

  • Experimental data suggest protective benefits of hypercapnia.
  • Adverse outcomes associated with hypercapnia are possible.
  • Further research is needed to determine safe and effective PaCO(2) ranges for specific neonatal populations.