... Bizzy Blue Hole 2009
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A bad habit is spreading among divebuddies and safetydivers - they go for a rescuebreath (blowing into the mouth) within seconds.
It is my belief that this is less effective and even contra productive.
1) When a freediver blackout under water the laryngospasm kicks in (the epiglottis seals the throat).
2) This muscle is very strong. VERY strong.
3) No air pressure (a blow) can open it.
4) It will open when oxygen supply for this muscle has run out, or...
5) When the subconscious of the victim decides to open it.
6) It will open when the victim feels safe and know there is air on the outside.
7) The victim becomes aware of this (even subconsciously) when they feel air BLOWN into the face, when they feel they are being touched, when they hear they are being talked to, when they feel safe.
8) Blowing into the mouth might cause small amounts of air drip down the throat and cause the epiglottis to seal even more ... delaying a revival.
9) IF a rescue breath did open a laryngospasm it would be enough with one ... in some cases it has to be done many times (why does it not work the first time?) ... in these cases it is my belief that it is not the blow that eventually revives the victim, but the actual touching.
The frustration over an unconscious dive buddy that stays in black out makes the safetydiver wanting to do MORE ... a rescuebreath FEELS like a professional thing to do, something very decisive ... it is not.
The correct action is MORE blowing onto face, More touching/tapping of face.
This conclusion I have come to after talking to anaesthesia doctors, emt- personel and scientists.
2007-11-01 17:41:27 |
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