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Related Concept Videos

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...
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...
Pneumothorax II: Pathophysiology01:08

Pneumothorax II: Pathophysiology

Pneumothorax means the presence of air in the pleural space — the thin potential gap between the visceral and parietal pleura. This condition disrupts the normal pressure balance that keeps the lungs inflated, leading to partial or complete collapse of the affected lung.Normal physiologyUnder normal conditions, the pleural space maintains a slightly negative intrapleural pressure, which keeps the lungs expanded against the chest wall. This negative pressure creates a delicate balance between...
Atelectasis II: Pathophysiology01:10

Atelectasis II: Pathophysiology

Atelectasis develops when alveoli lose their air and collapse inward. Because lung tissue is naturally elastic, these air sacs shrink rather than remaining open. Collapsed alveoli are no longer ventilated, reducing their role in gas exchange. Blood flow may continue in these regions, creating a ventilation–perfusion mismatch. Clinical findings include decreased breath sounds, dullness to percussion, reduced chest expansion, and decreased tactile fremitus as sound transmission through collapsed...
Acute Respiratory Failure-III01:30

Acute Respiratory Failure-III

Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without causing...
Pneumothorax-I01:26

Pneumothorax-I

A pneumothorax is a condition where air builds up in the space between the lung and the chest wall, causing the lung to collapse. This condition arises when air enters the space between the parietal and visceral pleura, disrupting the negative pressure essential for lung inflation. This can lead to a partial or complete collapse of the lung.
Pneumothorax can be even further classified as spontaneous, traumatic, and tension pneumothorax.

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Related Experiment Video

Updated: Jun 26, 2026

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

A Model to Simulate Clinically Relevant Hypoxia in Humans

Published on: December 22, 2016

Decompression Sickness; Not Only in Divers: Altitude as a Risk Factor.

Oded Ben-Ari1, Daniel Gabbai2, Idan Nakdimon2

  • 1Department of Military Medicine and "Tzameret", Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel, Department of Aviation Physiology, Israeli Air Force Aeromedical Center, Ramat Gan, Israel, Adelson School of Medicine, Ariel University, Ariel, Israel.

The Israel Medical Association Journal : IMAJ
|June 25, 2026
PubMed
Summary
This summary is machine-generated.

Altitude decompression sickness (ADCS) is rare in altitude chamber training, affecting less than 1% of individuals. Musculoskeletal symptoms are most common, and hyperbaric oxygen therapy (HBOT) remains the primary treatment for this condition.

Related Experiment Videos

Last Updated: Jun 26, 2026

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

A Model to Simulate Clinically Relevant Hypoxia in Humans

Published on: December 22, 2016

Area of Science:

  • Aviation Physiology
  • Aerospace Medicine
  • Hyperbaric Medicine

Background:

  • Decompression sickness (DCS) arises from rapid pressure reduction, affecting divers and individuals in hypobaric environments like altitude chambers.
  • DCS presents as Type 1 (musculoskeletal/skin) or Type 2 (neurological/pulmonary), with potential for life-threatening outcomes requiring hyperbaric oxygen therapy (HBOT).

Purpose of the Study:

  • To assess the incidence of altitude decompression sickness (ADCS) during altitude chamber training.
  • To compare the clinical presentation and treatment of ADCS with diving-related DCS (DDCS).

Main Methods:

  • A retrospective cohort study analyzed ADCS cases within the Israeli Air Force from 2015 to 2022.
  • Data collected included demographics, training details, clinical symptoms, and treatments, with DDCS data sourced from literature reviews.

Main Results:

  • The study identified 11 cases of ADCS among 2279 participants, yielding a 0.5% risk. Four additional cases occurred post-combat flights.
  • Musculoskeletal symptoms were prevalent in both ADCS and DDCS. Shorter HBOT protocols were more frequently used for ADCS (53%) compared to DDCS (30%).

Conclusions:

  • Altitude decompression sickness is an infrequent occurrence in altitude chamber trainees, with an incidence below 1%.
  • Musculoskeletal symptoms are the most common manifestation of ADCS.
  • Hyperbaric oxygen therapy (HBOT) is the established and primary treatment for ADCS.