Hemodialysis (HD) is one of the most often used modalities of blood epuration in ends-stage
renal diseases (ESRD) and requires the creation of a patent vascular access such as an
arteriovenous fistula (AVF). Native AVF is associated with lower morbidity and mortality
compared to hemocatheters.
AVF need a maturation process before its use. This process usually requires less than 6 weeks
and consists in a complex vascular remodeling process. Maturation can be considered as the
process leading to a newly created AVF being usable for hemodialysis; it encompasses
enlargement and thickening of the draining fistula vein, increasing the blood flow in the
absence of thrombosis and bleeding. According to the Kidney Disease Outcomes Quality
Initiative (KDOQI) guidelines, AVF is considered matured (and therefore usable for HD) if 6
weeks after AVF creation surgery: (a) its diameter is at least 6mm, (b) its depth less than
6mm, (c) flow rate is at least 600ml/min and (d) its length is at least 6cm in order to allow
a two needles cannulation. Delayed AVF maturation is a major complication that affects more
than half of the AVF. It can be defined as the delay or absence of maturation according to
KDOQI guidelines. The pathophysiology of delay or absence of AVF maturation is complex and
multifactorial. It mainly involves thrombosis, stenosis, endothelial dysfunction, and
hypercoagulability states.
In order to promote AVF maturation, the 2019 ERA-EDTA Clinical practice guidelines on peri-
and postoperative care of native AVF and grafts for HD in adults, propose some medical
treatments.
Antiphospholipid syndrome (APS) is an autoimmune disease, characterized by a prothrombotic
state affecting both arterial and venous vasculature. Classification criteria have been
proposed in 2006. In HD patient, up to 37% of patients have persistent aPL positivity. aPL
positivity has been associated with vascular access thrombosis in retrospective studies.
The investigators performed a retrospective analysis of 113 patients in the HD department of
the Brugmann Hospital between 01/01/2019 and 01/08/2019. Unpublished data that are currently
under evaluation for publication, showed that the prevalence of APS and antiphospholipid
antibody positivity (aPL) without APS, was 18.5% and the prevalence of APS was 10.7%.
Antiphospholipid antibody positivity was identified as a risk factor for delayed AVF
maturation. In multivariate analysis, antiphospholipid antibody positivity and stenosis were
both independent risk factors for delayed maturation. There is a statistically significant
association between delayed native AVF maturation and antiphospholipid antibody positivity.
This association was independent of arteriovenous stenosis. This data suggest a potential
non-stenotic and/or non-thrombotic mechanism of aPL related delayed maturation of the AVF in
HD patients. More interestingly, a significant association between aPL positivity (with or
without antiphospholipid syndrome) and delayed AVF maturation was found. This association was
independent of stenosis.
Considering this association between aPL and failure of native AVF maturation, the aim of the
present study is to further evaluate this association in a prospective cohort and to further
identify a potential treatment option in order to reduce the prevalence of this very common
complication '(i.e. AVF delay or absence of maturation).
