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Related Concept Videos

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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.
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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...
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Respiratory failure can manifest suddenly or gradually, characterized by a rapid decline in PaO2 and a rapid rise in PaCO2. This situation indicates a severe respiratory problem that may quickly become a life-threatening emergency. One of the early signs of hypoxemic Acute Respiratory Failure (ARF) is a change in mental status due to the brain's sensitivity to oxygen levels and changes in acid-base balance. Symptoms such as restlessness, confusion, and agitation suggest inadequate oxygen...
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Coronary Artery Disease III: Clinical Manifestations01:30

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Coronary Artery Disease (CAD) is a primary health risk worldwide, leading to significant morbidity and mortality. The condition arises from the buildup of atherosclerotic plaques within the coronary arteries, resulting in diminished blood supply to the heart muscle.The clinical manifestations of CAD vary widely, from asymptomatic stages to severe, life-threatening conditions. Understanding these manifestations is crucial for early diagnosis and effective management.Angina Pectoris: The Warning...
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Pulmonary embolism (PE) occurs when a thrombus, fat or air embolus, amniotic fluid, or tumor tissue blocks one or more pulmonary arteries. These blockages originate in the venous system or the right side of the heart.EtiologyPE primarily arises from deep vein thrombosis (DVT) and other hypercoagulable states, such as inherited thrombophilias. Additional etiological factors include venous stasis, commonly seen in obesity, and endothelial injury from surgery and trauma. Less common causes include...
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Related Experiment Video

Updated: Mar 2, 2026

Training Rats to Voluntarily Dive Underwater: Investigations of the Mammalian Diving Response
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Sudden Death in a Diver: A Diagnostic Conundrum.

Scott Dougherty1, Maziar Khorsandi2, Myra Adelbai1

  • 1Department of Internal Medicine, Ministry of Health, Belau National Hospital, Koror, Republic of Palau (Drs Dougherty and Adelbai).

Wilderness & Environmental Medicine
|May 15, 2017
PubMed
Summary

A scuba diver experienced an air supply failure during ascent, leading to rapid unconsciousness and death. Autopsy revealed significant air embolism and trauma, highlighting the need for prompt investigation in dive fatalities.

Keywords:
air embolismbarotraumadecompression illnessradiographic imaging

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Area of Science:

  • Diving Medicine
  • Forensic Pathology

Background:

  • Scuba diving carries inherent risks, including the potential for air supply emergencies.
  • Rapid ascent can lead to serious physiological complications.

Observation:

  • An experienced diver lost consciousness after running out of air during final ascent.
  • Postmortem examination revealed extensive subcutaneous emphysema, pneumomediastinum, and air in the central circulation.

Findings:

  • The diver presented with significant upper airway hemorrhage.
  • Postmortem CT scan identified air in the central circulation, pneumomediastinum, and subcutaneous emphysema.

Implications:

  • Understanding the pathophysiology of dive-related fatalities is crucial for prevention and safety.
  • Recommends expedited whole-body postmortem CT and autopsy for dive fatalities to ensure thorough investigation.