ADP Chapter 3

Question 1

What is nitrogen tension?

Answer 1

Difference in nitrogen pressures between tissue and ambient

Question 2

What is a half time?

Answer 2

Time it takes for tissue to become 50% desaturated

Question 3

What techniques can be used for decompression stops?

Answer 3

Contact with anchor line 
Using a lifting bag 
Holding onto a wall 
Using a shot line 
Prestationed platform 
Decompression trapeze

Question 4

Why are smokers more at risk?

Answer 4

Surfactant loss
Lower tidal volume
CO binding to Hb

Question 5

What happens if you omit a decompression stop?

Answer 5

Should be monitored and put on oxygen

No diving for 24-48 hours

Question 6

What is the US Navy’s alternative to omitting deco stops?

Answer 6

If diver ascends from 6m or shallower, feels well and can return within 1 minute, descend to required stop depth and continue, adding 1 minute

If diver ascends from 6m or shallower and is not able to return within 1 minute, diver can return to stop and multiple stop time by 1.5

If a diver ascends from a stop deeper than 6m, return the diver to first stop, follow schedule for any stops 12m or greater, use 1 minute between stops, multiple 9, 6 and 3m stops by 1.5