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45 Cards in this Set

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Explain In-water decompression on air and


oxygen.

- 30 - 20 fsw stops on O2


- air breaks every :30


- if the final O2 period is 35 minuets or less,


a final air break at the 30 minute mark is not


required.

Explain Surface Decompression on Oxygen


(SurDO2).

- Surface after 40 fsw stop @ 40 fpm.


- :05 surface interval from 40 fsw to 50' feet in the chamber

Explain Surface Decompression from 30 and 20 fsw.

- Diving supervisor can initiate surface decompression at any point during in-water decompression at 30 or 20 fsw.


- Before shift to 02, use O2 periods as perscribed


- After shift, calculate new O2 periods required


- Remaining O2 time X 1.1 round minutes up to next half period

Explain if SurD is elected while decompressing on air at 30 fsw.

-@ 30 fsw


- Compute Air/O2 Trading Ratio


(Air time @ 30 fsw divided by O2 time at 30 fsw)


- Divide remaining time by ratio


- Add to 20 fsw O2 stop time-


- X 1.1 round minutes up to the next half period



Explain if Sur D was elected while


decompressing at 20 fsw.

-Compute Air/O2 Trading Ratio


- Air time @ 20fsw divided by O2 time @ 20 fsw


- Divide remaining time by ratio


- X 1.1 round minutes up to the next half period

Delays in arriving at the first decompression stop deeper than 50 fsw.

- Round up delay to next whole minute


- Recompute Table and schedule


- Perform and deeper stops missed at current depth.

Delays in arriving at the first decompression stop shallower than 50fsw.

- Round up delay to next whole minute


- Add to 1st decompression stop

Delays in leaving a stop or between decompression stops deeper than 50fsw.

-Round up delay to the next whole minute


-Recompute table and schedule


-Pick up new schedule at current depth

Delays in leaving a stop or between decompression stops shallower than 50 fsw.

Disregard.

Delay leaving or between 30, 20 fsw stop.

-Delay counts towards next decompression stop.


- Shift divers to air at :30 min O2 time


- Resume decompression at the end of delay.

Delay leaving 20fsw to the surface.

-Shift divers to air at :30 min O2 time


- Resume Decompression at the end of delay


- Disregard delay time.

Loss of O2 in water before the shift

-Continue breathing air; consider any time spent on air as dead time


-If the problem can be corrected , vent both divers and resume decompression.


- If the problem can't be corrected , initiate surface decompression.


- If there is no chamber, continue decompression in the water.

Loss of O2 in the water after the shift @ 30fsw

-Shift the diver back to air.


-If the problem can be corrected, ventilate divers and resume decompression.


-If the problem can't be corrected initiate surface decompression.


-Multiply the remaining O2 time by 1.1, round up to the next 1/2 period.


-If the there is no chamber, multiply remaining 30 fsw stop time by the air/O2 ratio.


- Take the full 20fsw air stop as prescribed in the air decompression table.

Loss of O2 in the water after the shift @ 20fsw

- Shift the diver back to air.


- If the problem can be corrected, ventilate divers and resume decompression.


- If the problem can't be corrected, initiate surface decompression.


-Multiply the remaining O2 time by 1.1 and round up to next 1/2 period.


-If there is no chamber, multiply the remaining 20fsw stop time by the air/O2 ratio.

In the chamber you have a temporary loss of O2

-Continue breathing air; consider and time spent on air as dead time.

In the chamber you have a permanent loss of O2 but 50/50 is available.

-Multiply remaining O2 time by 2


-Air breaks are not required


-Consider any time spent on air as dead time


-Allocate: 10% @ 40', 20% @ 30', 70% @ 20'

In the chamber you have a permanent loss of O2 you only have air available at 50fsw

-Multiply remaining O2 time by Air/O2 ratio @ 30 and 20fsw stop


-Allocate 10% @ 40', 20% @ 30',70% @ 20'

In the chamber you have a permanent loss of O2 you only have air available at 30fsw

-Multiply remaining O2 time by Air/O2 ratio @ 30 and 20 stop.


- Allocate: 30% @ 30', 70% @ 20'



CNS O2 toxicity in the water non-convulsive.

-Initiate surface decompression.


-Shift the console to air during travel to the surface.


-Multiply remaning O2 time by 1.1, round up to next 1/2 period.

CNS O2 toxicity in the water at 30fsw non-convulsive and no chamber available

- Up 10fsw, Shift the console to air during travel to 20fsw.


- Ventilate divers; affected diver first.


-multiply remaining 30fsw stop time by Air/O2 ratio, add to 20 fsw stop time.

CNS O2 toxicity in the water at 20fsw non-convulsive and no chamber available.

-Shift console to air.


-Ventilate divers, affected diver first.


-Multiply remaining 20fsw stop time by Air/O2 ratio, perform on air.

CNS O2 toxicity in the water convulsive and chamber is available

-Shift both divers to air.


-Ventilate unaffected diver and ventilate then stricken diver.


-Hold the divers at depth until the tonic-clonic phase of the convulsion has subsided


- Surface decompress maintaining airway


- Multiply remaining O2 time by 1.1, round up to next 1/2 period.

CNS O2 toxicity in the water convulsive at 30 fsw and no chamber is available.

-Shift both divers to air.


-Ventilate unaffected diver and then ventilate the stricken diver.


-Hold the divers at depth until the tonic-clonic phase of the convulsion has subsided.


- Continue decompression in the water


- Multiply the remaining 30fsw stop time by Air/O2 ratio.


-Take the full 20fsw air stop as prescribed in the air decompression table.

CNS O2 toxicity in the water convulsive at 20fsw and no chamber is available.

-Shift both diver to air.


-Ventilate unaffected diver and then ventilate the stricken diver.


-Hold the divers at depth until the tonic-clonic phase of the convulsion has subsided.


-Continue decompression on air in the water


-Multiply remaining 20 fsw stop time by Air/O2 ratio.

CNS O2 toxicity in the water convulsive and cannot ascertain breathing.

-Shift both divers to air.


-Ventilated unaffected diver and then ventilate the stricken diver.


-Hold the divers at depth until the tonic-clonic phase of the convulsion has subsided.


-Surface the affected diver w/ standby diver maintaining an open airway.


- On the surface, the affected diver should


receive any necessary airway support and be immediately recompressed and treated for arterial gas embolism.

CNS O2 toxicity in the chamber non-convulsive

-Off O2


-:15 after symptoms subside, resume @ point of interruption

CNS O2 Toxicity in the chamber convulsive or second symptom

-Off O2


-After symptoms subside, up 10' @ 1fpm


-Resume @ point of interruption

CNS O2 toxicity in the chamber second symptom after convulsion or 3rd symptom at 40fsw

-Off O2


-Multiply remaining O2 time by air/O2 ratio @ 30 and 20 fsw stop


-Allocate 10% @ 40', 20% @ 30', 70% @ 20'





CNS O2 toxcity in the chamber second symptom after convulsion or 3rd symptom at 30fsw

-Off O2


-Multiply remaining O2 time by air/O2 ratio @ 30 and 20 fsw stop


-Allocate 30% @ 30', 70% @ 20'

Surface interval from :5 to :7 min

Add 1/2 O2 period (:15) at 50' in the chamber

Surface interval greater than :7 min

2 or fewer O2 periods required


-compress to 60 fsw


-TT5




2 or more O2 periods required


-Compress to 60 fsw


-TT6

Cannot clear in the chamber to reach 50 fsw, 20 fsw is the deepest in water stop.

-Begin O2 breathing @ deepest depth attainable


-Compress to 20fsw


-Double schedule O2 periods


-:60 on O2 :15 air break



Cannot clear in the chamber to reach 50 fsw, 30 fsw is the deepest in water stop.

-Begin O2 breathing @ deepest depth attainable


-Compress to 30 fsw


-Double scheduled O2 periods


-:60 on O2 :15 air break

Type I Decompression sickness during surface interval during SurD symptoms resolved during :15 at 50' chamber stop or surface interval less than :05

-Add :15 to 50' O2 time

Type I DCS during surface interval during a surface interval. Symptoms unresolved during :15 at 50' chamber stop or surface interval greater than :5

2 or fewer O2 periods required


-Compress to 60 fsw


-TT5 (minimum)




2 or more O2 periods required


-Compress to 60 fsw


-TT6 (minimum)

Type II DCS during surface interval during a surD

-Compress to 60 fsw


-TT6 (minimum)

DCS in the water and diver remains in the water you only have air available.

-Launch standby


-Descend 10 fsw, if no significant relief, descend 10 more feet.


-Remain at treatment depth for at least 30min


-Decompress 1.5 times all subsequent stops


-If no stops scheduled, 1.5 times first stop time @ 10' intervals.


-Residual symptoms: TT6 (minimum)


-No Residual symptoms: TT5

DCS in the water and diver remains in the water. You have O2 available.

-Launch standby


-Descend 10fsw, if no significant relief, descend 10 more feet.


-Remain at treatment depth for at least 30 min.


-Decompress 1.5 times all subsequent stops


-If no stops scheduled, 1.5 times first stop time @ 10' intervals


-Begin O2 breathing @ 40 few


-Continue on O2 for 1.5 times the stop time @ 40', 30', 20' to the surface.


-Residual symptoms: TT6 (minimum)


-No Residual symptoms: TT5

Type I DCS in the water , diver leaving the water.

-Surface and recompress IMMEDIATELY!


-Treat as Type II

Type II DCS in the water, diver leaving the water.

-Surface and recompress IMMEDIATLY!


-Treat as appropriately.

Asymptomatic omitted decompression, no stops missed.

-Observe on surface 1 hour


-Conduct Neuro exams throughout and at the end of hour.

Asymptomatic omitted decompression, missed 20 or 30 fsw stop. Surface interval less than 1 min.

-Return to stop, add 1 min to stop time.

Asymptomatic omitted decompression, missed 20 or 30 fsw stop. Surface interval between :1-:7 min.

Chamber available


-Sur D


-If greater than :5 but no more than :7 , add :15 to 50' O2 time.




No Chamber


-Return to depth of stop


-1.5 times 30' and 20' stop times

Asymptomatic omitted decompression, missed 20 or 30 few stop. Surface interval greater than :7 min

Chamber available


2 or fewer O2 periods


-Compress to 60' start TT5


2 or more O2 periods required


-Compress to 60' start TT6




No Chamber


-Return to depth of stop


-1.5 times 30' and 20' O2 stop times.

Asymptomatic omitted decompression, missed stop deeper than 30.



Chamber available


-TT6


-TT6A greater than 50fsw omitted




No chamber


-Return to depth of stop


-Follow regular schedule to 30', shift to O2 if


possible


-1.5 times 30' and 20' few stop times