In the replanation procedures, the vein anastomosis is important as well as arterial anastomosis. When no distal vein is available in digital replantation, another distal artery can be anastomosed to proximal vein so that this arteriovenous anastomosis provides venous outflow. But the mechanism of success in replantation with such an iatrogenic arteriovenous shunt was still unclear.
In order to prove that such an iatrogenic arteriovenous shunt can be a real substitute of vein to vein anastomosis, the authors would quantitate oxygen delivery by using blood gas analysis. The authors used rabbit ear for digital replantation model, which was replanted with arterial anastomosis and distal artery to proximal vein anastomosis. The blood, which was drained through the artery of distal portion, was studie by gas analysis. Oxygen partial pressure(PO₂) and oxugen saturation(SO₂) of this blood in experimental group were compared with those of arterial blood and venous blood in control group.
Mean oxygen partial pressure(PO₂) and oxygen saturation(SO₂) were 85.2±3.2 mmHg and 95.4±1.5 % in arterial blood, 43,4±5.1 mmHg and 72.8±7.2 % in venous blood, and 53.7±12.2 mmHg and 77.8±9.8 % in experimental group.
These finding indicate that the artery, which is anastomosed to proximal vein, cna be used as a substitute of vein.
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