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Related Concept Videos

Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

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:
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 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...
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:
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...
Pulmonary Ventilation: Inhalation01:24

Pulmonary Ventilation: Inhalation

Pulmonary ventilation is a vital process that ensures the exchange of oxygen and carbon dioxide in the lungs. It refers to the movement of air into and out of the lungs, enabling the body to obtain oxygen and remove waste carbon dioxide. In this article, we will explore the intricacies of pulmonary ventilation, including its underlying principles, mechanisms, and the interplay of pressures within the respiratory system.
Boyle's law becomes particularly pertinent when examining respiratory...

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Related Experiment Video

Updated: Jul 3, 2026

Image Acquisition Method for the Sonographic Assessment of the Inferior Vena Cava
06:59

Image Acquisition Method for the Sonographic Assessment of the Inferior Vena Cava

Published on: January 13, 2023

Inferior vena cava respiratory variability changes during jet ventilation in rigid bronchoscopy: a prospective

Mingyuan Yang1,2, Yuxue Yao2, Hong Li2

  • 1Department of Anesthesiology, Beijing Tongren Hospital, Capital Medical University, Beijing, 100730, China.

BMC Anesthesiology
|July 2, 2026
PubMed
Summary

Inferior vena cava (IVC) respiratory variability significantly decreases during rigid bronchoscopy with jet ventilation. This suggests IVC indices are unreliable for assessing fluid status in this specific ventilatory setting.

Keywords:
Closed positive-pressure ventilationHemodynamicsInferior vena cavaJet ventilationRigid bronchoscopy

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Published on: January 8, 2019

Area of Science:

  • Critical Care Medicine
  • Anesthesiology
  • Cardiovascular Physiology

Background:

  • Inferior vena cava (IVC) respiratory variability is a common method for assessing fluid responsiveness.
  • Its interpretation is context-dependent, especially during specific ventilatory techniques like jet ventilation used in rigid bronchoscopy.
  • The impact of jet ventilation on IVC-derived indices is not well understood.

Purpose of the Study:

  • To investigate the changes in IVC-derived respiratory variability during rigid bronchoscopy.
  • To evaluate the effect of transitioning from mask-assisted positive-pressure ventilation to open jet ventilation on IVC parameters.
  • To determine the reliability of IVC indices for fluid status assessment in this context.

Main Methods:

  • A prospective, self-controlled observational study involving 60 adult patients undergoing rigid bronchoscopy.
  • Measurements of IVC parameters using M-mode ultrasonography were taken at three time points: baseline, mask ventilation, and jet ventilation.
  • The primary outcome was the change in IVC distensibility index (dIVC) between mask and jet ventilation phases.

Main Results:

  • The IVC distensibility index (dIVC) significantly decreased from 86.29% during mask ventilation to 22.08% during jet ventilation (P < 0.001).
  • A large effect size (Cohen's d = 1.79) was observed for the change in dIVC.
  • Changes included increased minimum IVC diameter and reduced IVC diameter variation, while heart rate and mean arterial pressure remained stable.

Conclusions:

  • Transitioning to open jet ventilation during rigid bronchoscopy causes a marked change in IVC-derived respiratory variability.
  • IVC indices are sensitive to ventilation mode and airway openness, questioning their utility for direct intravascular volume status assessment in this scenario.
  • Conventional IVC interpretation thresholds should be used cautiously during open jet ventilation due to altered physiological conditions.