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Related Concept Videos

Mechanical Ventilation II: Invasive Ventilation01:23

Mechanical Ventilation II: Invasive Ventilation

Ventilators are essential medical equipment used to aid patients with respiratory difficulties. Their primary function is to assist or replace spontaneous breathing by providing mechanical ventilation. There are two general classes of mechanical ventilators: negative-pressure and positive-pressure ventilators.
Negative-Pressure Ventilators
Negative-pressure ventilators create a vacuum around the chest or body to draw air into the lungs, simulating breathing. This method does not require an...
Mechanical Ventilation III: Noninvasive Ventilation01:23

Mechanical Ventilation III: Noninvasive Ventilation

Noninvasive positive-pressure ventilation (NIPPV), continuous positive airway pressure (CPAP), and bilevel positive airway pressure (BiPAP) are essential methods in respiratory care. These ventilation techniques offer unique benefits for patients with various respiratory conditions, providing adequate support without requiring intubation. Let's explore how each method is crucial in improving patient outcomes and enhancing respiratory therapy.
Noninvasive Positive-Pressure Ventilation (NIPPV)
Ventilatory Modes01:14

Ventilatory Modes

Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
Physiological Control of Respiration01:23

Physiological Control of Respiration

Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
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...
Mechanical Ventilation I: Indication and Settings01:29

Mechanical Ventilation I: Indication and Settings

Mechanical ventilation is a life-saving technique for managing acute respiratory failure and other respiratory complications. The process involves using a machine known as a ventilator to supply oxygen to the lungs and assist in removing carbon dioxide. It serves as a bridge to long-term mechanical ventilation or a temporary measure until ventilatory support is discontinued. The ventilator can maintain this function for a prolonged period, providing critical support for patients until they can...

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Related Experiment Video

Updated: May 16, 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

Adaptive support ventilation with and without end-tidal CO2 closed loop control versus conventional ventilation.

Demet S Sulemanji1, Andrew Marchese, Marc Wysocki

  • 1Department of Anesthesia, Critical Care and Pain Medicine, Harvard Medical School and Massachusetts General Hospital, Boston, MA, USA. dsulemanji@partners.org

Intensive Care Medicine
|November 16, 2012
PubMed
Summary

Adaptive Support Ventilation with CO2 control (ASVCO2) offers tighter carbon dioxide regulation compared to other modes. ASVCO2 demonstrated benefits in ARDS patients, preventing hypocapnia and reducing plateau pressures.

Related Experiment Videos

Last Updated: May 16, 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

Area of Science:

  • Mechanical Ventilation
  • Respiratory Physiology
  • Critical Care Medicine

Background:

  • Mechanical ventilation modes aim to optimize gas exchange.
  • Closed-loop control systems offer potential advantages in ventilation management.
  • End-tidal CO2 (etCO2) monitoring is crucial for assessing ventilation adequacy.

Purpose of the Study:

  • To compare adaptive support ventilation with end-tidal CO2 control (ASVCO2) against pressure control (PC) and volume control (VC) ventilation.
  • To evaluate these modes under simulated conditions of normal lungs, COPD, ARDS, and brain injury.
  • To assess the impact on etCO2 and plateau pressure (P Plat).

Main Methods:

  • A lung model simulated various respiratory compliances and resistances.
  • Simulated conditions included normal lungs, COPD, ARDS, and brain injury.
  • Different levels of PEEP and CO2 production were tested, with tidal volume set at 6 mL/kg for PC and VC.

Main Results:

  • ASVCO2 maintained a narrower range of etCO2 across all conditions.
  • In ARDS, ASVCO2 resulted in higher etCO2 compared to other modes.
  • ASVCO2 and ASV showed lower P Plat in ARDS and when P Plat exceeded 28 cmH2O.

Conclusions:

  • All ventilation modes performed similarly in most simulated scenarios.
  • Closed-loop modes, particularly ASVCO2, showed minor advantages.
  • ASVCO2 provided superior CO2 control, especially in ARDS, preventing hypocapnia and reducing P Plat.