----- Original Message -----
From: "Helen Deborah Vecht"
> Good thinking!
> Couldn't you use an ordinary 'venous' tourniquet rather more effectively
> and comfortably for this, leaving your hands free?
> Helen D. Vecht: [log in to unmask]
It's a thought Helen, but I figure I apply quite a high pressure with my
grip! i.e. probably over systolic pressure, as any of us is capable of
obliterating arterial pulsation with our normal grip. A venous tourniquet on
the other hand only manages 50 to 60mmHg (that's the point of a venous
tourniquet, to obliterate venous flow while allowing arterial flow to
continue). During a Bier's block, the anaesthetic solution is forced in at
quite a high pressure, gradually building in pressure as the solution
collects, and I don't believe a venous tourniquet would contain it. I don't
have any scientific evidence for this however, but I'm sure somebody will
study the hydraulics some day! I suppose I could apply another Bier's cuff
distally, and I gather some people do this, but it's a fairly simple thing