Difference between revisions of "Arteriovenous Fistula"

From WikiVet English
Jump to navigation Jump to search
Line 63: Line 63:
[[Category:Cardiovascular Pathology - Dog]][[Category:Arterial_Pathology]][[Category:To_Do_-_Cardiovascular]]
[[Category:Cardiovascular Diseases - Dog]][[Category:Arterial_Pathology]][[Category:To_Do_-_Cardiovascular]]

Revision as of 15:37, 16 December 2010


  • As the name implies, an arteriovenous fistula is an abnormal direct connection between an artery and a vein. This connection causes the capillary circulation to be completely ignored. We will concentrate on peripheral fistulas here.

The consequences of an arteriovenous fistula are the following:

1. Increased blood return to the right heart raises cardiac output

2. Decreased blood perfusion at the affected site

3. Venous hypertension

  • Predisposing causes of arteriovenous fistula formations are: trauma, surgery, neoplasia, etc.


History & Clinical Signs

  • Signs depend on where the AV fistula has formed.

-Subcutaneous edema

-Warm Swelling


-Pain +/-

-Palpable vibration (thrill) over fistula

-Increased pulse & heart rate

-Audible continuous murmur over the fistula site

-Branham sign (decreased heart rate with surgical occlusion of blood flow to fistula)


-Abnormal direct connection between an artery and a vein


-Abnormal flow visualized


-Surgical ligation of abnormal vessels to and from the fistula area

-(+/-) Amputation


-Good with complete ligation and cessation of blood flow through the fistula

-Poor if surgical ligation is unsuccessful at stopping blood flow through the fistula