Nitrogen released from tissues - “off-gassing” Tissues release nitrogen at different rates Body can tolerate a certain excess of nitrogen Nitrogen still being released when back on the surface If a diver ascends too quickly Nitrogen will be released as bubbles in the tissues or bloodstream Can cause Decompression Illness (DCI) Nitrogen release needs to be managed Nitrogen in body in equilibrium with air On a dive Increase in ambient pressure results in more nitrogen absorbed into body tissues - “on-gassing” Going deeper or longer increases body’s uptake of nitrogen Different tissues absorb nitrogen at different rates ‘Fast tissues - good blood supply ‘Slow’ tissues - poorer blood supply, fatty tissuesĥ Nitrogen Release On ascent If a diver ascends too quickly Every dive requires a plan for safety and enjoyment Two of the most important considerations Nitrogen management Ensuring sufficient breathing gas for the diveĪtmosphere 79% Nitrogen, 21% Oxygen N2 O2 Nitrox A breathing gas usually having more than 21%O2 Gases Dissolve in the blood - a liquid Oxygen utilised, carbon dioxide produced Oxygen, carbon dioxide come out of blood as gases in alveoli Diving - ambient pressure increases Higher concentration of gas delivered to diver Higher concentration of gases dissolved in the blood including nitrogenĤ Nitrogen Absorption On the surface On a dive
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