radeck wrote:I'm wondering about the possibility that there may just not much blood running through these veins to begin with, and this sucks them squished like a cheap garden hose (borrowing this term from somebody else who first coined it). I'm wondering what evidence we have against this hypothesis.
Rokkit wrote:I think when Dr Dake measures the decrease in pressure gradient across the stenosis following stent placement, that's what proves there's plenty of blood wanting to go that route.
Rokkit wrote:I'm glad you got some answers. Are you doing the venography and stuff and when?
Venous pressure Pressures measured in patients and controls respectively were not significantly different (Mann–Whitney) (superior vena cava 13 (SD 4) vs 13 (4), azygous 16 (7) vs 14 (4), IJVs 14 (4) vs 12 (5)). In contrast, the pressure gradient measured in CDMS across the stenosies was significantly different. For instance, pressure in the stenotic proximal azygous vein was 3.9 cm/H2O higher as compared with the pressure measured in the adjacent superior vena cava of the same subjects (p<0.01; Mann–Whitney); equally, pressure in the stenotic IJVs was 1.8 cm/H2O higher with respect to the cava (p<0.04; Mann–Whitney
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