I have a feeling that our main problem is:
1) Tracheasqueeze and that the bloodspecks mainly comes from the throat and bloodvessel inbetween (?) the cartilage. The throat I believe goes deeper down into the lungs than we generally percieve as "the throat".
I do not believe that the small increase of pressure from let say 60-70 causes bloodvessels to break in the alveolis.
I also believe that a significant factor for producing squeeze symptoms are strong contractions at depth. But I also believe that high CO2 is very beneficial for extreeme dives.
This is just a theory on what happens in most cases of blood spitting.
2) It might just be that the PACKING is the main culprit, actually inhibiting bloodshift and therefore the blood comes from the lung as FERNET implies.
Quote:
|
Originally Posted by fpernett
After a full pack you are over your TPC and the resistance of the vessels is higher than normal, and the flow is minimal. When the dive start lung volume decrease rapidly and resistance goes down, with increasing flow that can produce shear stress on endothelial cells.
|
But packing is what takes me from 60-70 meters.
3) Or can ALL symptoms of squeeze (during a dive with packing) be avoid if you descent slow from 0-15. The question is how slow would this be? 2 m/s ?
Quote:
|
Originally Posted by fpernett
...due to the pulmonary hypoxic vasoconstriction the resistance is very high, and with higher flow than usual make the apneist prone to the pulmonary edema.
|
But the chest area is not exposed to vasoconstriction, is it?
And yes - we must not forget that the blood in some cases can come from the SINUS area. Maybe caused by ruptured bloodvessels due to blockage and overpressure.
Sebastian
