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00:01:57 1 Decompression
00:03:43 2 Common procedures
00:03:59 2.1 Descent rate
00:04:42 2.2 Bottom time
00:05:27 2.3 Ascent rate
00:06:55 3 No decompression dives
00:07:25 3.1 Safety stop
00:08:14 3.2 No decompression limit
00:09:48 4 Continuous decompression
00:11:36 5 Staged decompression
00:12:07 5.1 Decompression stops
00:14:07 5.1.1 Deep stops
00:16:51 5.1.2 Profile determined intermediate stops
00:18:27 5.2 Decompression schedule
00:19:51 5.3 Missed stops
00:21:29 6 Accelerated decompression
00:22:50 6.1 Oxygen decompression
00:23:49 7 Repetitive dives
00:24:28 7.1 Surface interval
00:25:13 7.2 Residual nitrogen time
00:26:39 8 Diving at altitude
00:28:16 9 Flying and ascent to altitude after diving
00:28:51 10 Technical diving
00:32:40 11 Specialised decompression procedures
00:34:18 11.1 Surface decompression
00:34:29 11.2 Dry bell decompression
00:37:28 11.3 Saturation decompression
00:38:31 11.4 Therapeutic decompression
00:40:56 11.4.1 Therapeutic decompression on air
00:41:24 11.4.2 Hyperbaric oxygen therapy
00:42:05 11.4.3 In water recompression
00:42:48 12 Decompression equipment
00:45:11 12.1 Planning and monitoring decompression
00:46:17 12.2 Controlling depth and ascent rate
00:49:27 12.3 Providing gases to accelerate decompression
00:53:28 12.4 Surface decompression
00:55:57 13 Teaching of decompression practice
00:58:22 14 See also
01:00:00 15 References
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Speaking Rate: 0.8986267080238315
Voice name: en-AU-Wavenet-B
"I cannot teach anybody anything, I can only make them think."
- Socrates
SUMMARY
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The practice of decompression by divers comprises the planning and monitoring of the profile indicated by the algorithms or tables of the chosen decompression model, to allow asymptomatic and harmless release of excess inert gases dissolved in the tissues as a result of breathing at ambient pressures greater than surface atmospheric pressure, the equipment available and appropriate to the circumstances of the dive, and the procedures authorized for the equipment and profile to be used. There is a large range of options in all of these aspects.
Decompression may be continuous or staged, where the ascent is interrupted by stops at regular depth intervals, but the entire ascent is part of the decompression, and ascent rate can be critical to harmless elimination of inert gas. What is commonly known as no-decompression diving, or more accurately no-stop decompression, relies on limiting ascent rate for avoidance of excessive bubble formation. Staged decompression may include deep stops depending on the theoretical model used for calculating the ascent schedule. Omission of decompression theoretically required for a dive profile exposes the diver to significantly higher risk of symptomatic decompression sickness, and in severe cases, serious injury or death. The risk is related to the severity of exposure and the level of supersaturation of tissues in the diver. Procedures for emergency management of omitted decompression and symptomatic decompression sickness have been published. These procedures are generally effective, but vary in effectiveness from case to case.
The procedures used for decompression depend on the mode of diving, the available equipment, the site and environment, and the actual dive profile. Standardized procedures have been developed which provide an acceptable level of risk in the circumstances for which they are appropriate. Different sets of procedures are used by commercial, military, scientific and recreational divers, though there is considerable overlap where similar equipment is used, and some concepts are common to all decompression procedures.
