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Related Concept Videos

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...
Bronsted-Lowry Acids and Bases02:58

Bronsted-Lowry Acids and Bases

The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...
Carbon Dioxide Transport in the Blood01:19

Carbon Dioxide Transport in the Blood

Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
Blood Studies I: ABG and VBG01:26

Blood Studies I: ABG and VBG

Blood studies are critical in the medical field, enabling healthcare professionals to assess a patient's health status accurately. This page will focus on two significant blood studies: Arterial Blood Gas (ABG) and Venous Blood Gas (VBG).
Arterial Blood Gas (ABG)
Arterial Blood Gas (ABG) studies are crucial for assessing the lungs' ability to supply oxygen and remove carbon dioxide, reflecting the patient's ventilation status. They also help understand the kidneys' capacity to reabsorb or...
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...
Respiratory Regulation of Acid-Base Balance01:18

Respiratory Regulation of Acid-Base Balance

Respiratory compensation is a vital physiological process that stabilizes blood plasma pH by regulating the partial pressure of carbon dioxide (PCO2), a key determinant of pH levels. Most carbon dioxide in the blood dissolves and converts into carbonic acid (H2CO3). It dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3⁻). There is also an inverse relationship between PCO2​​ and pH.
When carbon dioxide levels increase in the blood, more H+ and HCO3⁻ are produced, leading to a...

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Related Experiment Video

Updated: Jun 12, 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

Bench-to-bedside review: carbon dioxide.

Gerard Curley1, John G Laffey, Brian P Kavanagh

  • 1Department of Anaesthesia, Clinical Sciences Institute, National University of Ireland, Galway, Ireland.

Critical Care (London, England)
|May 26, 2010
PubMed
Summary

Both hypocapnia (low carbon dioxide) and hypercapnia (high carbon dioxide) impact critically ill patients. This review examines their roles, potential benefits, and risks in acute lung injury and critical care.

Area of Science:

  • Physiology
  • Critical Care Medicine
  • Respiratory System

Background:

  • Carbon dioxide (CO2) is a metabolic byproduct of aerobic respiration.
  • PaCO2 reflects the balance between CO2 production and elimination.
  • Hypocapnia and hypercapnia are observed in various disease states and clinical interventions.

Purpose of the Study:

  • To review the clinical status of low and high PaCO2 in critically ill patients.
  • To discuss insights from carbon dioxide studies.
  • To identify concerns and clinical implications for acute lung injury management.

Main Methods:

  • Literature review of current clinical status and research on PaCO2.
  • Discussion of pathophysiological roles of hypocapnia and hypercapnia.

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Last Updated: Jun 12, 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
07:51

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

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  • Analysis of clinical implications for critically ill patients.

    • Main Results:

    • Hypocapnia is common in conditions like asthma, pulmonary edema, and acute lung injury.
    • Hypercapnia is increasingly prevalent due to ventilation strategies, with potential roles in inflammation but risks in sepsis.
    • Both low and high PaCO2 present distinct challenges and potential benefits in critical illness.

    Conclusions:

    • Understanding the dual role of PaCO2 is crucial for managing critically ill patients.
    • Further research is needed to clarify the precise implications of hypocapnia and hypercapnia.
    • Optimizing CO2 levels may be a key therapeutic target in acute lung injury and critical care.