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. 2020 Nov 20;14(7):1747-1751.
doi: 10.1093/ckj/sfaa189. eCollection 2021 Jul.

The arteriovenous access stage (AVAS) classification

Peter Baláž  1   2 , Jennifer Hanko  3 , Hannah Magowan  3 , Agnes Masengu  3 , Katarina Lawrie  1 , Stephen O'Neill  3
Affiliations

The arteriovenous access stage (AVAS) classification

Peter Baláž et al. Clin Kidney J. .

Abstract

Background: Key anatomical factors mean that individuals needing arteriovenous access are unique and have different possibilities for fistula creation. The aim of this article is to describe a new classification system for all patients needing haemodialysis vascular access in the upper extremity with the purpose to simplify sharing the information about suitability for surgical access creation depending on vascular anatomy.

Methods: According to the patient's vascular anatomy in right and left superior extremities, patients were separated into three arteriovenous access stages (AVAS). The AVAS was validated by three blinded observers using a sample of 70 upper limb arteriovenous maps that were performed using ultrasound on patients referred for vascular access assessment. A sample size calculation was performed and calculated that for three observers, a minimum of 67 maps were required to confirm significant agreement at a Kappa value of 0.9 (95% confidence interval 0.75-0.99).

Results: The Kappa value for inter-rater reliability using Fleiss' Kappa coefficient was 0.94 and all patients fitted into the AVAS classification system.

Conclusion: The AVAS classification system is a simplified way to share information about vascular access options based on a patient's vascular anatomy with high inter-rater reliability.

Keywords: arteriovenous fistula; arteriovenous graft; classification; haemodialysis; vascular access.

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Figures

FIGURE 1:
FIGURE 1:
AVAS 1 indicates the possibility of autogenous AVA in different parts of the upper extremity. A negative Allen’s test is demonstration of a complete palmar arch and intact collateral blood flow to the hand.
FIGURE 2:
FIGURE 2:
AVAS 2 is reserved for patients in whom conventional autogenous AVA is not possible and the only option is an arteriovenous graft. A negative Allen’s test is demonstration of a complete palmar arch and intact collateral blood flow to the hand.
FIGURE 3:
FIGURE 3:
AVAS 3 is reserved for patients without the possibility for conventionally created autogenous or prosthetic options for access creation due to insufficient venous, arterial system or its combination. A negative Allen’s test is demonstration of a complete palmar arch and intact collateral blood flow to the hand.
See this image and copyright information in PMC

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