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Elevated Trimethylamine-N-oxide (TMAO) Is Associated with Vascular Access Dysfunction in Maintenance Hemodialysis
Yin Zheng1, Yuan Ren1, Li You1
1Department of Nephrology, Huashan Hospital, Fudan University, Shanghai, China.
Introduction:
Elevated levels of trimethylamine-N-oxide (TMAO), a metabolite produced by gut microbiota, have been associated with cardiovascular diseases and complications in various populations. However, its role in vascular access dysfunction in hemodialysis patients remains underexplored. This study investigates the potential relationship between TMAO levels and vascular access dysfunction in maintenance hemodialysis patients.
Methods:
This study included 80 hemodialysis patients. The baseline serum TMAO levels were measured, and clinical characteristics and dialysis-related data were collected. They were followed up on vascular access dysfunction events over a period of 1 year. The association between serum TMAO levels and vascular access dysfunction events were investigated.
Findings:
In our cohort, we observed a wide distribution of serum concentrations, with a median concentration of 15.2 μmol/L and a maximum concentration of 245.3 μmol/L. Patients were stratified into a low-TMAO group and a high-TMAO group according to the median value of TMAO concentrations. Those in the high-TMAO group had a significantly higher incidence of vascular access dysfunction events (p = 0.023). TMAO was independently associated with vascular access dysfunction events after adjusting for some potential vascular access dysfunction risk factors.
Discussion:
This study suggests that elevated serum TMAO levels may serve as an independent risk factor for vascular access dysfunction in hemodialysis patients. Reducing TMAO levels may potentially decrease the incidence of vascular access dysfunction, warranting further investigation into this therapeutic approach.
Insights
Elevated trimethylamine-N-oxide (TMAO) levels are linked to increased vascular access dysfunction in hemodialysis patients. Lowering TMAO may reduce these complications, suggesting a potential therapeutic target.
Area of Science:
- Nephrology
- Cardiovascular Research
- Microbiome Research
Background:
- Trimethylamine-N-oxide (TMAO), a gut microbiota metabolite, is linked to cardiovascular diseases.
- The role of TMAO in vascular access dysfunction (VAD) among hemodialysis (HD) patients is not well understood.
Purpose of the Study:
- To investigate the association between serum TMAO levels and VAD in maintenance HD patients.
- To determine if TMAO is an independent risk factor for VAD in this population.
Main Methods:
- Serum TMAO levels were measured in 80 HD patients.
- Clinical and dialysis data were collected, and patients were followed for 1 year for VAD events.
- Statistical analyses were performed to assess the association between TMAO and VAD.
Main Results:
- Serum TMAO concentrations varied widely, with a median of 15.2 μmol/L.
- Patients with high TMAO levels exhibited a significantly higher incidence of VAD (p=0.023).
- TMAO remained independently associated with VAD after adjusting for risk factors.
Conclusions:
- Elevated serum TMAO levels may be an independent risk factor for VAD in HD patients.
- Targeting TMAO reduction could potentially lower VAD incidence.
- Further research is needed to explore TMAO-lowering therapeutic strategies.
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