by decreasing the ascent rate from 1 minute between stops to 1 fsw per minute since the original was published in 1958. use: treatment of pain only decompression sickness when oxygen cannot be used. pain is relieved at a depth greater than 66 fsw (20 msw). oxygen not available maximum pressure 165 fsw (50 msw) run time 13 hours 33 minutes us navy air treatment table 3 table 3 is included in the us navy diving manual revision 6 and is authorized for use as a last resort when oxygen is not available. this table has been revised by decreasing the ascent rate from 1 minute between stops to 1 fsw per minute since the original was published in 1958. use: treatment of serious symptoms when oxygen cannot be used and symptoms are relieved within 30 minutes at 165 feet. oxygen not available maximum pressure 165 fsw (50 msw) run time 21 hours 33 minutes us navy recompression treatment table 4 this table is in the us navy diving manual revision 6 and is currently authorized for use. use: treatment of serious symptoms when oxygen can be used and symptoms are not relieved within 30 minutes at 165 fsw (50 msw). oxygen enriched treatment gases and oxygen may be used. air may be used if nothing better is available. if oxygen breathing is interrupted no compensation to the times is required. oxygen partial pressure may not exceed 3 ata (3 bar). maximum depth 165 fsw (50 msw) time at 165 fsw optional from 30 minutes to 2 hours including compression total run time 39 hours 6 minutes to 40 hours 36 minutes us navy recompression treatment table 5 use: treatment of pain-only decompression sickness when oxygen can be used and symptoms are relieved within 10 minutes at 60 ft. treatment table 5 is currently included in the us navy diving manual and is approved for use. oxygen treatment maximum pressure 60 fsw (18 msw) standard run time 2 hours 16 minutes the table may be extended by two oxygen-breathing periods at the 30 fsw (9 msw) stop us navy recompression treatment table 5a us navy table 5a use: treatment of gas embolism when oxygen can be used and symptoms are relieved within 15 minutes at 165 fsw (50 msw). treatment table 5a is not currently included in the us navy diving manual (revision 6). oxygen treatment maximum pressure 165 fsw (50 msw) run time 2 hours 34 minutes us navy recompression treatment table 6 use: treatment of pain-only decompression sickness when oxygen can be used and symptoms are not relieved within 10 minutes at 60 fsw (18 msw). oxygen treatment maximum pressure 60 fsw (18 msw) run time 4 hours 45 minutes catalina modification the catalina treatment table is a modification of treatment table 6. oxygen cycles are 20 minutes, and air breaks 5 minutes. the full catalina table allows for up to 5 extensions at 60 fsw. shorter versions include: 3 oxygen cycles at 60 fsw followed by a minimum of 6 oxygen cycles at 30 fsw. (equivalent to usn table 6) 4 oxygen cycles at 60 fsw followed by a minimum of 9 oxygen cycles at 30 fsw. 5 to 8 oxygen cycles at 60 fsw followed by a minimum of 12 oxygen cycles at 30 fsw. tenders breathe oxygen for 60 minutes at 30 fsw. further treatments may follow after at least 12 hours on air at the surface. us navy recompression treatment table 6a use: treatment of gas embolism when oxygen can be used and symptoms moderate to a major extent within 30 minutes at 165 ft. this treatment table is included in the us navy diving manual revision 6 and is currently authorized for use. it has been updated since original publication. oxygen treatment optional treatment with oxygen enriched gases (heliox or nitrox) not exceeding 3.0 ata (3 bar) partial pressure of oxygen if available maximum pressure 165 fsw (50 msw) nominal run time 5 hours 50 minutes from reaching full pressure at 50msw (absolute pressure 6 bar) an oxygen fraction of 50% will produce a partial pressure of 3 bar, this could be a nitrox, heliox or trimix blend with 50% oxygen. us navy treatment table 7 use: treatment of non-responding severe gas embolism or life-threatening decompression sickness. it is used when loss of life may result from decompression from 60 fsw. it is not used to treat residual symptoms that do not improve at 60 fsw, or to treat residual pain. treatment table 7 is included in the us navy diving manual revision 6 and is currently authorized for use. oxygen is used if practicable maximum pressure 60 fsw (18 msw) minimum time at 60 fsw is 12 hours. decompression following this length of exposure is generally considered decompression from saturation, so the decompression profile is not affected by longer exposure at 60 fsw. use of this table may be preceded by initial treatment on table 6, 6a or 4. table 7 treatment begins on arrival at 60 fsw. duration of decompression is 36 hours decompression comprises an approximated continuous ascent with stops every 2 fsw as shown in the graphic profile, with a stop at 4 fsw for 4 hours to avoid inadvertent loss of pressure due to seal failure at low pressure differences. us navy treatment table 8 us navy recompression treatment table 8 for 225 fsw use: mainly for treating deep uncontrolled ascents when more than 60 minutes of decompression have been omitted. treatment table 8 is included in the us navy diving manual revision 6 and is currently authorized for use. adapted from royal navy treatment table 65. patient is recompressed to pressure of symptomatic relief but not to exceed 225 fsw and treatment initiated once begun, decompression is continuous, but may be interrupted at 60 fsw or shallower. heliox mixtures may be used at pressures exceeding 165 fsw to reduce nitrogen narcosis. heliox 64/36 is the preferred treatment gas. heliox or nitrox with partial pressure not exceeding 3 ata may be used as treatment gas at pressures less than 165 fsw 100% oxygen may be used as treatment gas at pressures less than 60 fsw decompression is done by 2 fsw pressure decrements unless the start depth is an odd number, in which case the first stop is at a 3 fsw reduction in pressure. stop times vary according to the depth range of the stop. shorter stops are done at greater pressures, and the stop time increases as the stops get shallower. nominal total ascent time from 225 fsw is 56 hours 29 minutes. us navy treatment table 9 use: hyperbaric oxygen treatment as prescribed by diving medical officer for: residual symptoms after treatment for age/dcs cases of carbon monoxide or cyanide poisoning smoke inhalation initial treatment of patients urgently needing definitive medical care for severe injuries. maximum pressure 45 fsw (13.5 msw) nominal elapsed time excluding pressurization 102 minutes treatment depth may be reduced to 30 fsw (9 msw) if patient cannot tolerate oxygen at 45 fsw (13.5 msw). table may be extended to a maximum of 4 hours oxygen breathing time. us navy treatment table for decompression sickness occurring on saturation dives use: for treatment of decompression sickness manifested as musculoskeletal pains only, during decompression from saturation. maximum pressure specified is 1600 fsw recompression in increments of 10 fsw at 5 fsw per minute until diver reports improvement. it is not usually necessary or desirable to recompress by more than 30 fsw. treatment gas with oxygen partial pressure of up to 2.5 atm may be administered by bibs mask for periods of 20 minutes, with breaks of 5 minutes on chamber gas during recompression and holding periods. pure oxygen may be used at pressures less than 60 fsw. use: for treatment of serious decompression sickness resulting from upward excursion. recompression immediately at 30 fsw per minute to at least the depth from which the excursion started. if this does not provide complete relief compression should continue until relief is reported. hold at relief depth for at least 2 hours for pain only symptoms and at least 12 hours for serious symptoms. decompress after treatment according to normal saturation decompression schedule from the treatment depth. tektite i and ii treatment and emergency decompression schedule for a 42 to 50-foot saturation dive treatment of tektite aquanauts after emergency surfacing. saturation gas mixture nitrox 9% oxygen available maximum pressure 60 fsw (18 msw) run time 14 hours 40 minutes tektite ii treatment and emergency decompression schedule for the 100-foot saturation dive treatment of tektite aquanauts after emergency surfacing. oxygen available maximum pressure up to 200 fsw run time variable depending on circumstances royal navy 1943 recompression treatment procedure treatment of any decompression sickness symptoms. oxygen not used maximum pressure variable up to 225 fsw (68 msw) run time 4 hours 57 minutes to 5 hours 57 minutes royal navy table 51 - air recompression therapy use: treatment of pain-only decompression sickness when oxygen is not available and pain is relieved within 10 minutes at or less than 20 msw (667 fsw) oxygen not used maximum pressure 30 msw (98 fsw) run time 7 hours 5 minutes royal navy table 52 - air recompression therapy use: treatment of pain-only decompression sickness when oxygen is not available and pain is not relieved within 10 minutes at or less than 20 msw (66 fsw) but does have relief within 10 minutes at 50 msw (165 fsw). oxygen not used maximum pressure 50 msw (164 fsw) run time 9 hours 58 minutes royal navy table 53 - air recompression therapy use: treatment of joint pain plus a more serious symptom of decompression sickness when oxygen is not available and symptoms are relieved within 30 minutes at or less than 50 msw (164 fsw) oxygen not used maximum pressure 50msw (164 fsw) run time 19 hours 48 minutes royal navy table 54 - air recompression therapy use: treatment of joint pain plus a more serious symptom of decompression sickness when oxygen is available and symptoms are not relieved within 30 minutes at or less than 50 metres (164 ft) oxygen available maximum pressure 50 msw (164 fsw) run time 39 hours 0 minutes royal navy table 55 - air recompression therapy use: treatment of joint pain plus a more serious symptom of decompression sickness when oxygen is not available and symptoms are not relieved within 30 minutes at or less than 50msw (164 fsw) oxygen not available maximum pressure 50 msw (164 fsw) run time 43 hours 0 minutes royal navy table 61 - oxygen recompression therapy use: treatment of pain only decompression sickness when oxygen is available and pain is relieved within 10 minutes or at less than 18 msw (59 fsw), or for serious symptoms where a specialist medical officer is present. oxygen treatment maximum pressure 18 msw (59 fsw) run time 2 hours 17 minutes royal navy table 62 - oxygen recompression therapy use: treatment of pain only decompression sickness when oxygen is available and pain is not relieved within 10 minutes at 18 msw (59 fsw), or for serious symptoms where a specialist medical officer is present. oxygen treatment maximum pressure 18 msw (59 fsw) run time 4 hours 47 minutes royal navy table 71 - modified air recompression table use: treatment of any decompression symptom if a specialist medical officer is present. oxygen not available maximum pressure 70msw (230 fsw) run time 47 hours 44 minutes royal navy table 72 - modified air recompression therapy use: treatment of any decompression symptom if a specialist medical officer is present. applicable for multiple recompression of submarine survivors. oxygen not available maximum pressure 50 msw (164 fsw) run time 46 hours 45 minutes rnpl therapeutic decompression from a helium-oxygen recompression use: treatment of decompression sickness occurring during decompression from a heliox dive. oxygen not used maximum pressure variable. may be greater than 137 msw (450 fsw) run time depends on treatment depth french navy recompression treatment table 1 (gers 1962) use: treatment of mild decompression sickness. oxygen is available maximum pressure 30 msw (98 fsw) run time 4 hours 12 minutes french navy recompression treatment table 2 (gers 1962) use: treatment of mild to moderate decompression sickness. oxygen is available maximum pressure 50 msw (164 fsw) run time 6