The fistulas themselves are fairly complicated, because there are several types that are installed for different reasons. A fistula is defined as a surgical passage that connects two “hollow” organs. There are three main types of fistulas that may be used for dialysis: Arteriovenous fistulas, arteriovenous grafts, or venous catheters. In the case of a dialysis fistula (as shown on the left), an artery is attached to the vein in the arm, and maturation of the fistula is necessary. It takes around three- six months for this fistula to mature, so if the patient is becoming close to dialysis, it is important for them to get this surgery. This is the most preferred way to get a fistula, as it has the lowest infection rate. However if the patient has small veins, they must consider other options. Grafts are normally placed if fistulas cannot be created. Instead of the artery being attached to the vein by surgery, an artificial tube made from fabric is added. The tube is put underneath the skin, and when it is time for dialysis, it will be attached to the machine. Arteriovenous grafts tend to last two to three years due to persistent clotting. Many patients I saw at the dialysis center had venous catheters, which are inserted in a large vein in the neck. A large portion of the catheter remains outside the body so it can be easily attachable to a dialysis machine, and as a result it may become easily infected. Sources: "Dialysis." Dialysis. N.p., n.d. Web. 21 Mar. 2017. <http://vascularim.com/dialysis.php>. "Vascular Access, Arteriovenous Fistula, Arteriovenous Graft, Venous Catheter." Department of Surgery. N.p., n.d. Web. 21 Mar. 2017. <http://www.surgery.usc.edu/vascular/vascularaccess.html>.
1 Comment
Raylene
3/23/2017 08:27:56 am
I feel for the patients who have to go through this process. Thank you for bringing awareness to nephrology and the illnesses associated with it.
Reply
Leave a Reply. |
AuthorMuhammad Ali Archives
May 2017
Categories |