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Ventilatory Modes

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...

Assessment of Ventilation II: Respiratory Depth and Rhythm

Assessment 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:

Mechanical Ventilation II: Invasive Ventilation

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...

Assessment of Ventilation I: Respiratory Rate

Assessment 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:

Factors Affecting Pulmonary Ventilation

Factors Affecting Pulmonary Ventilation

Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...

Mechanical Ventilation III: Noninvasive Ventilation

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)

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Related Experiment Video

Updated: Jul 3, 2026

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics

Published on: April 19, 2024

Flow Asynchronies During Pressure Support Ventilation in Children: A Bench Model Study.

Meryl Vedrenne-Cloquet^1,2, Yukie Ito³, Daniel Chang³

¹Dr. Vedrenne-Cloquet is affiliated with Unité de VNI et Sommeil de l'enfant, AP-HP, Hôpital Necker-Enfants malades, Paris, France.

Respiratory Care

|July 1, 2026

Summary

This summary is machine-generated.

Flow asynchrony is common in pediatric mechanical ventilation and varies by ventilator type. Adjusting support can reduce it but may cause other issues, highlighting the need for ventilator-specific management.

Keywords:

mechanical ventilation patient–ventilator asynchrony pediatric critical care

Related Experiment Videos

Last Updated: Jul 3, 2026

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics

Published on: April 19, 2024

Area of Science:

Pediatric critical care medicine
Respiratory physiology
Mechanical ventilation

Background:

Flow asynchrony, a type of patient-ventilator asynchrony (PVA), is poorly understood in pediatric intensive care units (PICUs).
This PVA type is linked to inadequate ventilator support or excessive patient inspiratory effort.

Purpose of the Study:

To investigate if visual patterns of flow asynchrony differ among pediatric ICU ventilators.
To determine how support levels and patient inspiratory effort influence flow asynchrony patterns.

Main Methods:

A bench study utilized an ASL5000 test lung with models simulating pediatric restrictive and obstructive lung diseases.
Four ventilators (AVEA, NKV, C6, ServoU) were tested under pressure-support ventilation (PSV) with varying support and effort levels.
Pressure and flow waveforms were analyzed to classify breaths as synchronous, flow asynchrony, double cycling, or ineffective effort.

Main Results:

Flow asynchrony occurred in 100% of breaths across all tested ventilators at baseline settings.
Increasing support or decreasing effort reduced flow asynchrony but sometimes led to ineffective efforts.
The AVEA ventilator demonstrated the quickest reduction in flow asynchrony.

Conclusions:

Flow asynchrony is a frequent occurrence during simulated pediatric PSV and is affected by patient effort and ventilator algorithms.
Modifying ventilator support to eliminate flow asynchrony may introduce other forms of PVA.
Ventilator-specific performance characteristics are crucial for effective PVA management in pediatric patients.