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Related Concept Videos

Factors Affecting Respiration01:24

Factors Affecting Respiration

Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:
Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
Pulmonary Ventilation: Inhalation01:24

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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...
Factors Affecting Pulmonary Ventilation01:19

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Alveolar Surface Tension
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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...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:

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Phenotyping Mouse Pulmonary Function In Vivo with the Lung Diffusing Capacity
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Pulmonary ventilatory function decreases in proportion to increasing altitude.

F Hashimoto1, B McWilliams, C Qualls

  • 1Department of Medicine, University of New Mexico School of Medicine, Albuquerque 87131, USA.

Wilderness & Environmental Medicine
|May 7, 2002
PubMed
Summary
This summary is machine-generated.

High-altitude trekking reduces pulmonary function, with forced vital capacity and expiratory volumes decreasing proportionally with altitude. These changes were well-tolerated and did not worsen with bronchodilator use.

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Area of Science:

  • Environmental Physiology
  • Pulmonary Medicine
  • Altitude Medicine

Background:

  • High-altitude environments pose physiological challenges.
  • Understanding pulmonary ventilatory function at altitude is crucial for trekkers and climbers.
  • Previous research has explored altitude effects on respiration, but specific responses to bronchodilation require further investigation.

Purpose of the Study:

  • To investigate the relationship between altitude and pulmonary ventilatory function during high-altitude trekking.
  • To assess the response of pulmonary function to bronchodilation at varying altitudes.
  • To determine if bronchodilator effectiveness changes with increasing altitude.

Main Methods:

  • A cohort experiment involving spirometric tests before and after bronchodilation.
  • Participants trekked in the Himalayas, with measurements taken at baseline (1624 m) and various altitudes (3404-4896 m).
  • Albuterol was administered via Rotahaler to assess bronchodilator response.

Main Results:

  • Forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1.0), and maximal midexpiratory flow rate (FEF25-75%) decreased proportionally with increasing altitude.
  • Pulmonary function returned to baseline levels upon descent.
  • A single participant experienced severe symptoms of acute mountain sickness, but their ventilatory measurements were not significantly different from the group.

Conclusions:

  • Pulmonary ventilatory function parameters (FVC, FEV1.0, FEF25-75%) decrease proportionally to altitude during high-altitude trekking.
  • These ventilatory changes are generally well-tolerated and do not appear to be linked to acute mountain sickness.
  • The bronchodilator effect of albuterol was not enhanced at higher altitudes.