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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:
Physiological Control of Respiration01:23

Physiological Control of Respiration

Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Alterations in Respiration II01:30

Alterations in Respiration II

There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure01:16

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure

Oxygen therapy has emerged as a significant tool in enhancing the quality of life for patients suffering from pulmonary arterial hypertension (PAH). While this therapy has principally been studied on patients with significant hypoxemia, this therapeutic approach helps prevent potential organ damage and can be administered in the comfort of one's home.
Oxygen therapy is vital in increasing and maintaining blood oxygen levels in PAH patients. As a result, it aids in reducing fatigue, improving...
Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
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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Related Experiment Video

Updated: Jul 12, 2026

A Model to Simulate Clinically Relevant Hypoxia in Humans
09:54

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Published on: December 22, 2016

Augmented hypoxic ventilatory response in men at altitude.

M Sato1, J W Severinghaus, F L Powell

  • 1Department of Anesthesia, University of California, San Francisco 94143.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 11, 1992
PubMed
Summary
This summary is machine-generated.

The hypoxic ventilatory response (HVR) increases with altitude acclimatization, contrary to the hypothesis that it remains constant. This elevated HVR persists even after returning to sea level, indicating a lasting adaptation to reduced oxygen levels.

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Area of Science:

  • Physiology
  • Altitude Medicine
  • Respiratory Control

Background:

  • The hypoxic ventilatory response (HVR) is crucial for oxygen homeostasis.
  • It is hypothesized that HVR is a fixed individual trait, unaffected by acclimatization.

Purpose of the Study:

  • To investigate whether hypoxic ventilatory response (HVR) changes with acclimatization to high altitude.
  • To determine if HVR remains constant or is modified by sustained exposure to reduced oxygen.

Main Methods:

  • Isocapnic 5-minute step hypoxic ventilatory response (HVR) was measured in six males at sea level and during 1-5 days at 3,810m altitude.
  • Measurements were repeated for one week after returning to sea level.
  • Hyperoxic conditions were used to ensure equal medullary central ventilatory drive and isocapnia was maintained.

Main Results:

  • HVR initially remained unchanged at 30 hours of altitude exposure but significantly increased by day 2 and day 4.
  • Elevated HVR persisted for at least one week after returning to sea level.
  • Hyperoxic ventilatory CO2 response also increased at altitude and post-altitude.

Conclusions:

  • The hypoxic ventilatory response (HVR) is not constant and is significantly enhanced by acclimatization to high altitude.
  • This enhanced HVR demonstrates a plasticity in respiratory control that persists after returning to sea level.
  • Findings challenge the notion of a fixed HVR and highlight adaptive changes in respiratory regulation.