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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:

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:

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Related Experiment Video

Updated: Oct 26, 2025

Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome ARDS

Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome ARDS

Published on: April 7, 2021

An adjusted and time-saving method to measure collateral ventilation with Chartis.

T David Koster¹, Karin Klooster¹, Hallie McNamara²

¹Dept of Pulmonary Diseases, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.

ERJ Open Research

|July 29, 2021

Summary

A new "volume trend for the previous 20 seconds" (VT20) threshold of ≤6 mL reliably identifies patients without collateral ventilation. This finding can significantly shorten bronchoscopic lung volume reduction procedures.

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Last Updated: Oct 26, 2025

Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome ARDS

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Published on: April 7, 2021

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Published on: January 8, 2019

Area of Science:

Pulmonology
Medical Devices
Respiratory Physiology

Background:

Bronchoscopic lung volume reduction (BLVR) using endobronchial valves is a key treatment for severe emphysema.
Assessing collateral ventilation is crucial for patient selection in BLVR.
The Chartis system is vital for evaluating collateral ventilation.

Purpose of the Study:

To assess a new feature of the Chartis system, the "volume trend for the previous 20 seconds" (VT20).
To determine if low flow during Chartis measurement predicts absence of collateral ventilation.
To evaluate if early termination of Chartis measurement based on VT20 can shorten procedure times.

Main Methods:

Retrospective analysis of 249 Chartis assessments in patients undergoing BLVR.
Calculation of VT20 for each assessment.
Comparison of VT20 thresholds between patients with (CV positive) and without (CV negative) collateral ventilation.

Main Results:

All patients without collateral ventilation (CV negative) achieved a VT20 ≤6 mL.
All patients with collateral ventilation (CV positive) had a VT20 ≥7 mL.
A median of 60 seconds was saved by terminating the assessment at VT20=6 mL.

Conclusions:

A VT20 threshold of ≤6 mL reliably excludes collateral ventilation in low airflow scenarios.
This method can reduce the duration of bronchoscopic lung volume reduction procedures.
VT20 offers a more efficient assessment of collateral ventilation.