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Shortness of breath out of proportion to effort being expended. [2] [7] Rapid, heavy or uneven breathing, or uncontrollable coughing. [10] Crackles, rattling or ‘junky’ feelings deep in the chest associated with breathing effort – usually progressively worsening with increasing shortness of breath and may be cause for a panic attack [2] [7]
Its initial symptoms of cough and difficulty breathing are similar to near-drowning, however, near-drowning does not cause viral infection-like symptoms. Furthermore, it can be difficult to distinguish the condition from an acute viral infection at first; unlike viral illnesses, salt water aspiration syndrome tends to improve within a few hours ...
This can be caused by breathing air at a pressure above normal or by breathing other gas mixtures with a high oxygen fraction, high ambient pressure or both. The body is tolerant of some deviation from normal inspired oxygen partial pressure, but a sufficiently elevated level of hyperoxia can lead to oxygen toxicity over time, with the ...
The disorders are caused by breathing gas at the high pressures encountered at the depth of the water and divers will often breathe a gas mixture different from air to mitigate these effects. Nitrox , which contains more oxygen and less nitrogen , is commonly used as a breathing gas to reduce the risk of decompression sickness at recreational ...
[35] [39] Divers breathing air at depths beyond 60 m (200 ft) face an increasing risk of an oxygen toxicity "hit" (seizure). Divers breathing a gas mixture enriched with oxygen, such as nitrox, similarly increase the risk of a seizure at shallower depths, should they descend below the maximum operating depth accepted for the mixture. [40]
Here, experts explain why your head feels heavy. Plus, learn the causes for why your head might feel heavy, treatment options, and when to see a doctor.
Divers who breathe from an underwater apparatus are supplied with breathing gas at ambient pressure, which results in their lungs containing gas at higher than atmospheric pressure. Divers breathing compressed air (such as when scuba diving ) may develop a pneumothorax as a result of barotrauma from ascending just 1 metre (3 ft) while breath ...
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