Related Experiment Video
Updated: Jun 13, 2026
05:56
Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit
Published on: September 6, 2024
[Aventilatory mass flow during apnea : investigations on quantification]
1Zentralinstitut für Anästhesie, Klinikverbund St. Antonius und St. Josef, Wuppertal, Wuppertal, Deutschland.
Der Anaesthesist
|May 11, 2010
Summary
Aventilatory mass flow (AVMF) during apnea is non-linear, with maximum flow related to oxygen consumption. This study quantifies AVMF, providing crucial data for apneic oxygenation during anesthesia.
Area of Science:
- Anesthesiology
- Respiratory Physiology
- Medical Device Technology
Context:
- Apneic oxygenation is a clinical technique using aventilatory mass flow (AVMF) for gas delivery during apnea.
- Quantitative data on AVMF during clinical apnea are lacking.
- Understanding AVMF is crucial for optimizing respiratory support during anesthesia.
Purpose:
- To quantitatively measure aventilatory mass flow (AVMF) during apnea in patients undergoing anesthesia.
- To analyze the temporal characteristics and patterns of AVMF development.
- To correlate AVMF with physiological parameters like heart rate and respiration.
Summary:
- AVMF measurements were performed in 23 patients during a 3-minute apnea period using a thermal mass flow analyzer.
- AVMF onset averaged 17.9 seconds after apnea initiation, reaching a maximum of 135 ml/min.
- Gas flow exhibited heart rate-synchronous oscillations and slower oscillations linked to Traube-Hering-Mayer waves.
Impact:
- Provides the first quantitative description of AVMF during clinical apnea.
- Findings suggest AVMF is non-linear and influenced by cardiac activity and respiration.
- This data can inform the clinical application of apneic oxygenation and mechanical ventilation strategies.
Related Concept Videos
01:26Respiratory Volumes and Capacities I
Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
01:20Assessment of Ventilation I: Respiratory Rate
Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
01:29Assessment of Ventilation II: Respiratory Depth and Rhythm
Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
01:15Respiratory Volumes
Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
01:22Respiratory Volumes and Capacities
The respiratory system is responsible for the intake of oxygen and the expulsion of carbon dioxide from the body. Respiratory volumes describe the volume of air in the lungs at different phases of the respiratory cycle. Tidal volume is the air breathed in and out during normal, quiet breathing. Inspiratory reserve volume is the air that can be forcefully inspired beyond the tidal volume. In contrast, expiratory reserve volume refers to the air that can be expelled from the lungs after a normal...
01:14Ventilatory 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...
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...