Background
There is controversy over the balance of benefit to harm of intravenous (IV) unfractionated heparin (UFH) in the creation of autogenous fistulas. This review aimed to assess the efficacy and safety of intraoperative administration of an IV UFH bolus during creation of autogenous venous access in kidney failure.
Methods
MEDLINE, Embase, and CENTRAL were systematically searched for randomized controlled trials (RCTs) recruiting adults with kidney failure undergoing arteriovenous dialysis access surgery (PROSPERO CRD42022319502). Quality was assessed using the Cochrane Risk of Bias Assessment Tool. Outcomes were fistula patency, bleeding complications, fistula thrombosis, and reintervention rates. Relative and absolute effects were synthesized using a random-effects model as risk ratio (RR) with 95% confidence intervals (CI). Certainty of evidence was assessed using the GRADE approach.
Results
Seven RCTs (701 participants) were identified. Risk of bias was low or unclear in most domains. Using IV UFH compared with no heparin may decrease the risk of loss of fistula patency (6 studies, 548 participants; RR, 0.49; I2, 0%; low certainty evidence). The greatest benefit was for autogenous radiocephalic fistula compared with other autogenous fistula formation (4 studies, 302 participants; RR, 0.45; I2, 0%; low certainty evidence). The risk of bleeding complications may be higher with IV UFH (7 studies, 698 participants; RR, 2.71; I2, 5%; low certainty evidence). The most common bleeding complications were hematoma formation (57%). Based on very low-certainty evidence, use of IV UFH may also associated with a reduced risk of acute fistula thrombosis (7 studies, 698 participants; RR, 0.49; I2, 54%).
Conclusions
Using an IV UFH bolus (compared with no heparin) during arteriovenous fistula creation, may improve early clinical patency and reduced thrombosis, but may result in more bleeding complications. Owing to the low certainty of evidence, a contemporary multicenter RCT is needed to further assess the validity of this conclusion. This study should provide an update on the existing guideline in the literature.
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