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Related Concept Videos

Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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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...
Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
Factors Affecting Pulmonary Ventilation01:19

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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.
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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:
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: May 20, 2026

Quantitative Mapping of Specific Ventilation in the Human Lung using Proton Magnetic Resonance Imaging and Oxygen as a Contrast Agent
08:26

Quantitative Mapping of Specific Ventilation in the Human Lung using Proton Magnetic Resonance Imaging and Oxygen as a Contrast Agent

Published on: June 5, 2019

Ventilation-perfusion distribution in normal subjects.

Kenneth C Beck1, Bruce D Johnson, Thomas P Olson

  • 1Department of Internal Medicine, Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 10, 2012
PubMed
Summary
This summary is machine-generated.

This study measured the distribution of ventilation and perfusion in humans for the first time. We found that perfusion distribution (σ(q)) is higher than ventilation distribution (σ(V)) across exercise levels.

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Phase-Resolved Functional Lung MRI for Pulmonary Ventilation and Perfusion (V/Q) Assessment
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Phase-Resolved Functional Lung MRI for Pulmonary Ventilation and Perfusion (V/Q) Assessment

Published on: August 9, 2024

Area of Science:

  • Pulmonary physiology
  • Respiratory medicine
  • Gas exchange dynamics

Background:

  • Previous research established functional values for ventilation distribution (σ(V)).
  • However, human values for perfusion distribution (σ(q)) and ventilation-perfusion (V/Q) correlation (ρ) remained unquantified.
  • Understanding these parameters is crucial for assessing lung function.

Purpose of the Study:

  • To quantify the functional values of LogSD of perfusion distribution (σ(q)) and the coefficient of correlation between ventilation and perfusion (ρ) in humans.
  • To characterize the bivariate log-normal distribution of ventilation and perfusion.
  • To analyze how these parameters change with rest and exercise.

Main Methods:

  • Utilized wash-in data from three gases (helium, acetylene, dimethyl ether) inspired by normal subjects.
  • Measured end-expiratory gas concentrations during the first 10 breaths at rest and during incremental exercise.
  • Evaluated bivariate log-normal distribution parameters (σ(V), σ(q), ρ) by matching calculated to measured expired gas concentrations.

Main Results:

  • At rest, perfusion distribution (σ(q)) was high (1.08 ± 0.12) and decreased with ventilation onset to 0.85 ± 0.09.
  • Perfusion distribution (σ(q)) remained higher than ventilation distribution (σ(V)) (0.43 ± 0.09) throughout exercise.
  • Correlation coefficient (ρ) increased to 0.87 ± 0.07, with LogSD of ventilation/perfusion (Va/Q) primarily driven by the σ(q)-σ(V) difference during exercise.

Conclusions:

  • This study provides the first human measurements of σ(q) and ρ.
  • The bivariate log-normal distribution effectively describes regional ventilation and perfusion.
  • Differences in σ(q) and σ(V) significantly influence Va/Q distribution during exercise.