The harmful effects of breathing<unk>  at higher partial pressures than normal
Partial pressure of O2 at sea level = 0.21 ATM
Toxicity based on both time of exposure and partial pressure of<unk> 
Generally, FiO2 of 40% or less (0.40 ATM) can be tolerated indefinitely
Most common in hyperbaric<unk>  therapy, scuba divers and prolonged administration of normobaric supplemental<unk> 
Pulmonary toxicity occurs sooner and at lower partial pressures than CNS toxicity, however there is no predictable pattern or sequence of symptoms for CNS toxicity (initial symptom may be seizure/coma)
Partial pressure of O2 at sea level = 0.21 ATM
Generally, FiO2 of 40% or less (0.40 ATM) can be tolerated indefinitely
Most common in hyperbaric<unk>  therapy, scuba divers and prolonged administration of normobaric supplemental<unk> 
Pulmonary toxicity occurs sooner and at lower partial pressures than CNS toxicity, however there is no predictable pattern or sequence of symptoms for CNS toxicity (initial symptom may be seizure/coma)
Pascals Law applies to the diving body (without air filled areas such as lungs) states that the pressure applied to any part of the enclosed liquid will be transmitted equally in all directions through the liquid.
Boyles Law applies to the diving body's air filled areas such as lungs, sinuses, middle ear, and states that the volume and pressure of a gas at a given temperature are inversely related.
At 2 ATA (10m/33ft) a given gas would be 1/2 it's volume, at 3 ATA (20m/66ft) it would be 1/3 it's volume and so on.
At 2 ATA (10m/33ft) a given gas would be 1/2 it's volume, at 3 ATA (20m/66ft) it would be 1/3 it's volume and so on.
Oxygen toxicity
Barotrauma of descent
Chlorate toxicity
Otic barotrauma
Lewisite toxicity
Pulmonary barotrauma
Carbon monoxide toxicity
Sinus barotrauma