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Related Concept Videos

Assessment of Ventilation I: Respiratory Rate01:20

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 Ventilation01:19

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...
Respiratory Volumes and Capacities01:22

Respiratory 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...
Respiratory Capacities01:24

Respiratory Capacities

Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
The Functional Residual Capacity (FRC) represents the air in the...
Respiratory Volumes01:15

Respiratory 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...
Respiratory Volumes and Capacities I01:26

Respiratory 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...

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Related Experiment Video

Updated: May 23, 2026

An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection
09:01

An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection

Published on: December 10, 2013

Quantifying crowding-ventilation effect on respiratory infections.

Wei Jia1, Pan Cheng1, Jian Hang2

  • 1Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, 999077, China.

Nature Communications
|May 21, 2026
PubMed
Summary
This summary is machine-generated.

Increasing indoor space per person, even modestly, significantly boosts clean airflow and reduces respiratory infection risk in crowded settings. This highlights the need for updated ventilation standards to enhance public health defenses.

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Absorption of Nasal and Bronchial Fluids: Precision Sampling of the Human Respiratory Mucosa and Laboratory Processing of Samples
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Absorption of Nasal and Bronchial Fluids: Precision Sampling of the Human Respiratory Mucosa and Laboratory Processing of Samples

Published on: January 21, 2018

Assessment of Respiratory Function in Conscious Mice by Double-chamber Plethysmography
08:58

Assessment of Respiratory Function in Conscious Mice by Double-chamber Plethysmography

Published on: July 10, 2018

Related Experiment Videos

Last Updated: May 23, 2026

An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection
09:01

An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection

Published on: December 10, 2013

Absorption of Nasal and Bronchial Fluids: Precision Sampling of the Human Respiratory Mucosa and Laboratory Processing of Samples
11:54

Absorption of Nasal and Bronchial Fluids: Precision Sampling of the Human Respiratory Mucosa and Laboratory Processing of Samples

Published on: January 21, 2018

Assessment of Respiratory Function in Conscious Mice by Double-chamber Plethysmography
08:58

Assessment of Respiratory Function in Conscious Mice by Double-chamber Plethysmography

Published on: July 10, 2018

Area of Science:

  • Environmental health
  • Epidemiology
  • Building science

Background:

  • Crowded, poorly ventilated indoor spaces are primary drivers of respiratory infection outbreaks like COVID-19.
  • The interplay between overcrowding, space size, and ventilation in disease transmission is not well understood.
  • Existing ventilation standards may be insufficient for high-occupancy environments.

Purpose of the Study:

  • To develop a framework for assessing infection risk in crowded indoor spaces.
  • To evaluate the impact of spaciousness and ventilation on airborne transmission.
  • To inform updated public health strategies for infectious disease control.

Main Methods:

  • Introduction of a novel framework using effective clean flow rate, combining clean airflow and volume-time air clearance (VTAC).
  • Analysis of real-world outbreak data from diverse settings (jails, shelters, dormitories).
  • Development of a model to predict infection patterns based on ventilation and spaciousness parameters.

Main Results:

  • Modest increases in spaciousness (16-32 m³/person) significantly enhance effective clean flow (8.7–17.6 L/s per person) in low-ventilation conditions.
  • Reduced aerosol exposure and infection risk were observed with increased space per person.
  • Current ventilation standards (e.g., ASHRAE 62.1-2022) may not adequately protect against infection in crowded spaces.

Conclusions:

  • Volume-time air clearance (VTAC) is a critical, underappreciated factor in mitigating long-range airborne transmission.
  • Updated ventilation and spaciousness standards are necessary to improve public health resilience against respiratory infections.
  • Integrating spaciousness into risk assessments can enhance the effectiveness of infection control measures.