Nitrox – Questions And Analytical Responses (A+)
Nitrox mix Correct Answer - more than 21% O2 and less than 79% N2
--this course covers 22-40% O2
O2 and N2 Correct Answer - O2 is vital in metabolism, N2 is inert, but
always absorbed during dives
Nitrox benefits Correct Answer - -extended no deco
-reduced surface intervals, more dives in a given time
-physiological advantage, when used with air tables or computer
Nitrox downsides Correct Answer - -some risks with elevated O2
exposures
-can be successfully managed with proper techniques
Nitrox history Correct Answer - -references back to 1800
-published discussion of nitrox 1943
-navy introduced in 1959
-noaa launched nitrox program in 1970
....
Nitrox various names Correct Answer - enriched air nitrox
abbreviations EAN EANx EAN32
Alternate names NOAA Nitrox I and II
denitrogenated air
oxygen enriched air
safe air
enriched air
Determining the partial pressure of a gas Correct Answer - PG= P * FG
Physiological effects of pressure Correct Answer - gas dynamics- gases
move throughout the body in response to partial pressure
Nitrogen dynamics Correct Answer - -upon descent, press increases
inside lungs, hence while they move out into tissues
, -upon ascent, pressure in tissues higher, and now the gradient is reversed,
moves back in lungs
deco sickness Correct Answer - tissues can tolerate some degree of
super saturation
--limits are exceeded, gas can come out of solution and form bubbles
contributing factors -- dehydration, cold, rapid ascent, workload
-tables and commuters help manage nitrogen exposures
nitrogen narcosis Correct Answer - -elevated partial pressure of N2 can
cause intoxicated like conditions
-not harmful, just may cause you to make bad decisions
oxygen dynamics Correct Answer - -tends to occur in a one direction
because its used in metabolism
-CO2 is is by product
**
CNS toxicity Correct Answer - -body can tolerate some over oxygenation
-elevated pp of O2 can interfere with CNS function
-convulsions may be first and only symptom
-potentially fatal due to risk of losing reg and drowning
symptoms of CNS toxicity Correct Answer - ConVENTED - convulsions
visual disturbances euphoria nausea tinnitus irritability dizziness
contributing factors to CNS Correct Answer - elevated Co2 **
how to help someone with CNS toxicity Correct Answer - "if something
seems wrong, it is wrong"
-establish physical control
-start slow ascent
-if reg is in mouth, hold it there
-if reg is out, don't put it back
-seek medical attention
pulmonary o2 toxicity Correct Answer - -dry, hacking, non productive
coup
-can effect whole body "whole body toxicity"
Nitrox mix Correct Answer - more than 21% O2 and less than 79% N2
--this course covers 22-40% O2
O2 and N2 Correct Answer - O2 is vital in metabolism, N2 is inert, but
always absorbed during dives
Nitrox benefits Correct Answer - -extended no deco
-reduced surface intervals, more dives in a given time
-physiological advantage, when used with air tables or computer
Nitrox downsides Correct Answer - -some risks with elevated O2
exposures
-can be successfully managed with proper techniques
Nitrox history Correct Answer - -references back to 1800
-published discussion of nitrox 1943
-navy introduced in 1959
-noaa launched nitrox program in 1970
....
Nitrox various names Correct Answer - enriched air nitrox
abbreviations EAN EANx EAN32
Alternate names NOAA Nitrox I and II
denitrogenated air
oxygen enriched air
safe air
enriched air
Determining the partial pressure of a gas Correct Answer - PG= P * FG
Physiological effects of pressure Correct Answer - gas dynamics- gases
move throughout the body in response to partial pressure
Nitrogen dynamics Correct Answer - -upon descent, press increases
inside lungs, hence while they move out into tissues
, -upon ascent, pressure in tissues higher, and now the gradient is reversed,
moves back in lungs
deco sickness Correct Answer - tissues can tolerate some degree of
super saturation
--limits are exceeded, gas can come out of solution and form bubbles
contributing factors -- dehydration, cold, rapid ascent, workload
-tables and commuters help manage nitrogen exposures
nitrogen narcosis Correct Answer - -elevated partial pressure of N2 can
cause intoxicated like conditions
-not harmful, just may cause you to make bad decisions
oxygen dynamics Correct Answer - -tends to occur in a one direction
because its used in metabolism
-CO2 is is by product
**
CNS toxicity Correct Answer - -body can tolerate some over oxygenation
-elevated pp of O2 can interfere with CNS function
-convulsions may be first and only symptom
-potentially fatal due to risk of losing reg and drowning
symptoms of CNS toxicity Correct Answer - ConVENTED - convulsions
visual disturbances euphoria nausea tinnitus irritability dizziness
contributing factors to CNS Correct Answer - elevated Co2 **
how to help someone with CNS toxicity Correct Answer - "if something
seems wrong, it is wrong"
-establish physical control
-start slow ascent
-if reg is in mouth, hold it there
-if reg is out, don't put it back
-seek medical attention
pulmonary o2 toxicity Correct Answer - -dry, hacking, non productive
coup
-can effect whole body "whole body toxicity"
