. Medical and surgical therapy . the two openings do notexactly correspond we have the be-ginnings of an arterio-venous haema-toma. But the extravasated bloodfinds the central end of the vein soeasy of access that it is rapidly takenup by it, and nothing remains buta slight effusion in the perivascular Fig. 12.—Diagram , ,1 showing the Sneatn. direct communi- Cicatrisation of the two wounds cation of an !• 1 J i_ 1 T 1 arterio - venous IS accomplished by an endothelial , which quickly unitesthe edges of the fistula. Between the two vessels,above and below the op
. Medical and surgical therapy . the two openings do notexactly correspond we have the be-ginnings of an arterio-venous haema-toma. But the extravasated bloodfinds the central end of the vein soeasy of access that it is rapidly takenup by it, and nothing remains buta slight effusion in the perivascular Fig. 12.—Diagram , ,1 showing the Sneatn. direct communi- Cicatrisation of the two wounds cation of an !• 1 J i_ 1 T 1 arterio - venous IS accomplished by an endothelial , which quickly unitesthe edges of the fistula. Between the two vessels,above and below the opening, the blood in the sheathtakes part in the organisation of a fibrous tissuewhich unites the arterial and venous walls for adistance of an inch or more. This adhesion of thetwo vessels is of great importance. It prevents boththe ligaturing of th( communication and the recon-stitution of the two vessels by a double invariable and immediate consequence of arterio-venous communication is dilatation of the central. 16 WOUNDS OF THE VESSELS and peripheral ends of the vein in the neighbourhoodof the,union. The violent projection ot blood towardsboth ends of the vein enormously increases the venoustension. The vein dilates and thickens, thus pre-senting the characteristic features of ancurismal varix(fig. 13). The dilation may be regular and spindleshaped, or it may become irregular and bulging in
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsurgery, bookyear1918
