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Related Concept Videos

Respiratory Volumes01:15

Respiratory Volumes

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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...
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Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

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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.
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Respiratory Volumes and Capacities01:22

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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...
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Inhaled Medications01:23

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Inhaled medications are crucial for managing chronic obstructive pulmonary disease (COPD) and asthma. They are essential for effective treatment and control, ensuring optimal respiratory health and well-being. Inhaled medication delivers drugs directly to the lungs, providing a rapid onset of action and reducing systemic side effects compared to oral or injectable medications. Three primary types of inhalation devices are used to administer these medications: nebulizers, metered-dose inhalers...
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Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

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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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Respiratory Capacities01:24

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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.
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Related Experiment Video

Updated: Sep 8, 2025

Assessment of Respiratory Function in Conscious Mice by Double-chamber Plethysmography
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Inhaled Volume as a Digital Biomarker Predicting Outcomes in Chronic Respiratory Disease.

Henry Chrystyn1, Mark Milton-Edwards2

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|July 2, 2025
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Summary

Digital inhalers track inhaled volume (InhV), a key digital biomarker for chronic respiratory disease. Lower InhV predicts exacerbations and indicates uncontrolled asthma, aiding patient management.

Keywords:
digital biomarkerdigital inhalerinhalation parametersinhaled volumepredictive biomarker

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Area of Science:

  • Digital health technologies
  • Respiratory medicine
  • Biomarker discovery

Background:

  • Digital biomarkers offer objective evaluation of therapeutic responses in chronic respiratory disease (CRD).
  • Exhaled airflow is crucial in CRD management, but inhaled parameters are less understood.
  • Digital inhalers passively collect inspiratory data like inhaled volume (InhV) and peak inspiratory flow (PIF).

Purpose of the Study:

  • To investigate the role and utility of inhaled volume (InhV) as a digital biomarker in CRD.
  • To assess the correlation between InhV and disease status, exacerbations, and inhalation technique.

Main Methods:

  • Utilized digital inhalers to passively collect inspiratory parameters (InhV, PIF) during real-world patient use.
  • Analyzed trends in InhV in relation to asthma/COPD exacerbations and disease control.
  • Correlated InhV with forced expiratory volume in one second (FEV1) and assessed measurement accuracy and variability.

Main Results:

  • InhV decreases before CRD exacerbations and increases post-exacerbation; it is lower in uncontrolled asthma.
  • A strong correlation was observed between InhV and FEV1, supporting its pathophysiological relevance.
  • InhV demonstrated accuracy and low variability, with technique decay impacting InhV more than PIF over time.

Conclusions:

  • InhV, measured by digital inhalers, is a valuable digital biomarker for CRD management.
  • InhV shows significant utility in predicting acute exacerbations and monitoring disease control.
  • Individualized InhV trends provide a valid basis for interpreting patient status over time.