Table 4.S

An example use of the FTM predicted risk categoriesa

ScoreRisk CategorybClinical Applicationc
<2.0Low risk: 25%PEd ± duplex ultrasound; create AVF
2.0 to 3.0Moderate risk: 35%PE,d duplex ultrasound ± venogram; create AVF
3.1 to 6.9High risk: 50%Arteriogram + venogram and appropriate preoperative intervention as necessary; create AVF with very close postoperative monitoring (e.g., weekly or biweekly), and anticipate the need for aggressive intervention to facilitate maturation
≥7.0Very high risk: 70%Consider another form of permanent access (e.g., graft); continue to avoid catheter use
  • a All patients with risk factors for central vein stenosis should have a venogram regardless of score. AVF, arteriovenous fistula; PE, physical examination.

  • b Because of the similarity in risks for patients who have fistula primary failure and those that fail to mature (see Figure 1), the risks have been rounded for ease of use.

  • c These are untested possible applications that will require prospective trial evaluation.

  • d Physical exam.