Freeman D E, Donawick W J, Klein L V
Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, New Bolton Center, Kennett Square.
Vet Surg. 1994 Jul-Aug;23(4):250-6. doi: 10.1111/j.1532-950x.1994.tb00479.x.
The effect of a single ligature on back pressure in the internal carotid artery was studied in nine horses. In six anesthetized horses, one internal carotid artery was catheterized 2 cm from its origin and blood pressure was recorded continuously. Then the artery was ligated, pressure was recorded again, and the horses were euthanatized. In another three anesthetized horses, indwelling catheters were placed in both internal carotid arteries and a loose ligature was placed proximal to one catheter. After horses recovered from anesthesia, the ligature was tied and blood pressure was recorded in both arteries on that day and 3 days later, then these horses were euthanatized. The anatomy of the cerebral arteries was examined in all nine horses. Blood pressure in the internal carotid arteries did not change after ligation. Subjectively, collateral channels considered most likely to maintain blood pressure in the ligated internal carotid artery were the caudal intercarotid artery and the cerebral arterial circle. We concluded that ligation of the internal carotid artery would not prevent severe hemorrhage from the internal carotid artery in horses with guttural pouch mycosis until the ligated artery thrombosed to the level of the lesion.
对9匹马进行了研究，以观察单一结扎对颈内动脉背压的影响。在6匹麻醉的马中，将一根导管插入一侧颈内动脉距其起点2厘米处，并持续记录血压。然后结扎该动脉，再次记录血压，随后对这些马实施安乐死。在另外3匹麻醉的马中，将留置导管分别置于双侧颈内动脉，并在一根导管近端放置一个宽松的结扎线。马从麻醉中恢复后，系紧结扎线，并在当天和3天后记录双侧动脉的血压，随后对这些马实施安乐死。对所有9匹马的脑动脉解剖结构进行了检查。结扎后颈内动脉血压未发生变化。主观上，最有可能在结扎的颈内动脉中维持血压的侧支通道是颈内后动脉和脑动脉环。我们得出结论，在患有咽鼓管囊霉菌病的马中，在结扎的动脉血栓形成至病变水平之前，颈内动脉结扎并不能防止颈内动脉严重出血。
