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Related Concept Videos

Inhalational Anesthetics: Overview01:20

Inhalational Anesthetics: Overview

Inhalation anesthetics are drugs that induce general anesthesia upon inhalation. They work by increasing the sensitivity of GABAA receptors or inhibiting NMDA receptors, leading to a decrease in central nervous system activity. The depth of anesthesia can be rapidly adjusted by changing the concentration of the inhaled gas. Some common examples of inhalational anesthetics include volatile liquids like isoflurane, desflurane, sevoflurane and gases like xenon and nitrous oxide. Isoflurane, a...
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-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:
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-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...

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Updated: Jul 16, 2026

Halogenated Agent Delivery in Porcine Model of Acute Respiratory Distress Syndrome via an Intensive Care Unit Type Device
09:36

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Published on: September 24, 2020

Hypercapnic hyperventilation shortens emergence time from isoflurane anesthesia.

Derek J Sakata1, Nishant A Gopalakrishnan, Joseph A Orr

  • 1Departmentof Anesthesiology, University of Utah, Salt Lake City, UT 84132, USA. Derek.Sakata@hsc.utah.edu

Anesthesia and Analgesia
|February 22, 2007
PubMed
Summary

Hyperventilation with CO2 rebreathing significantly shortens emergence time after isoflurane anesthesia. This method rapidly clears anesthetics while maintaining Paco2, improving patient recovery.

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Last Updated: Jul 16, 2026

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08:49

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Published on: October 16, 2013

Area of Science:

  • Anesthesiology
  • Respiratory Physiology
  • Surgical Recovery

Background:

  • Hyperventilation is used to shorten emergence time but lowers Paco2, reducing cerebral blood flow and respiratory drive.
  • Maintaining normal or increased Paco2 during hyperventilation may be achieved by adding airway deadspace.
  • Anesthetic adsorption in deadspace can prevent rebreathing of volatile agents.

Purpose of the Study:

  • To evaluate the effect of hypercapnic hyperventilation on emergence time after isoflurane anesthesia.
  • To assess the safety and efficacy of using airway deadspace to maintain Paco2 during hyperventilation.

Main Methods:

  • Twenty surgical patients receiving 1 MAC isoflurane were studied.
  • Patients experienced either mild hypocapnia (ETco2 ~28 mmHg) or mild hypercapnia (ETco2 ~55 mmHg).
  • Hypercapnia was maintained during doubled minute ventilation using airway deadspace with anesthetic adsorption and increased fresh gas flow.

Main Results:

  • Hypercapnic hyperventilation significantly shortened emergence times (P < 0.001).
  • Tracheal extubation time was reduced by an average of 59%.
  • Times for eye/mouth opening and bispectral index normalization to 0.95 were also faster.

Conclusions:

  • Hyperventilation combined with CO2 rebreathing effectively shortens emergence time after isoflurane anesthesia.
  • This technique is beneficial for rapid patient recovery, especially after prolonged or abrupt procedures.
  • Consideration of this method is recommended when rapid emergence is critical.