Intradialytic hypotension and vascular access thrombosis

Area of Science:

• Nephrology
• Vascular Surgery
• Clinical Epidemiology

Background:

• Vascular access thrombosis is a significant complication in hemodialysis, leading to increased morbidity and healthcare costs.
• Identifying modifiable risk factors for vascular access thrombosis is crucial for improving patient outcomes.

Purpose of the Study:

• To investigate the association between intradialytic hypotension and predialysis systolic blood pressure with vascular access thrombosis in hemodialysis patients.
• To determine if these hemodynamic factors differentially impact native arteriovenous fistulas versus prosthetic arteriovenous grafts.

Main Methods:

• Analysis of data from 1426 subjects in the HEMO study.
• Primary outcome: episodes of vascular access thrombosis within 6-month periods.
• Multivariable adjustment for covariates, including predialysis systolic blood pressure and intradialytic hypotension.

Main Results:

• A higher rate of thrombosis was observed in native arteriovenous fistulas with increased intradialytic hypotension.
• No significant association was found between intradialytic hypotension and prosthetic arteriovenous graft thrombosis.
• Higher predialysis systolic blood pressure was linked to a reduced rate of both fistula and graft thrombosis.

Conclusions:

• More frequent intradialytic hypotension and lower predialysis systolic blood pressure are associated with increased vascular access thrombosis rates.
• These findings highlight the importance of vascular access patency in blood pressure management strategies for hemodialysis.
• Optimizing blood pressure management may be key to reducing vascular access complications.