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. 2015 Jul;25(4):351-6.
doi: 10.1053/j.jrn.2015.02.006. Epub 2015 Mar 19.

Associations of Trimethylamine N-Oxide With Nutritional and Inflammatory Biomarkers and Cardiovascular Outcomes in Patients New to Dialysis

George A Kaysen  1 , Kirsten L Johansen  2 , Glenn M Chertow  3 , Lorien S Dalrymple  4 , John Kornak  5 , Barbara Grimes  5 , Tjien Dwyer  4 , Alexander W Chassy  6 , Oliver Fiehn  6
Affiliations

Associations of Trimethylamine N-Oxide With Nutritional and Inflammatory Biomarkers and Cardiovascular Outcomes in Patients New to Dialysis

George A Kaysen et al. J Ren Nutr. 2015 Jul.

Abstract

Objectives: Trimethylamine N-oxide (TMAO) is a product of metabolism of phosphatidylcholine (lecithin) and carnitine by the intestinal microbiome. Elevated serum concentrations of TMAO have been linked to adverse cardiovascular outcomes in the general population. We examined correlates of serum TMAO and the relations among serum TMAO concentrations, all-cause mortality, and cardiovascular mortality and hospitalizations in a nationally derived cohort of patients new to hemodialysis (HD).

Methods: We quantified serum TMAO by liquid chromatography and online tandem mass spectrometry and assessed nutritional and cardiovascular risk factors in 235 patients receiving HD and measured TMAO in pooled serum from healthy controls. We analyzed time to death and time to cardiovascular death or hospitalization using Cox proportional hazards regression.

Results: Serum TMAO concentrations of patients undergoing HD (median, 43 μM/L; 25th-75th percentile, 28-67 μM/L) were elevated compared with those with normal or near-normal kidney function (1.41 ± 0.49 μM/L). TMAO was directly correlated with serum albumin (Spearman rank correlation, 0.24; 95% CI, 0.12-0.35; P <.001), prealbumin (Spearman rank correlation, 0.19; 95% CI, 0.07-0.31; P = .003), and creatinine (Spearman rank correlation, 0.21; 95% CI, 0.08-0.33; P = .002) and inversely correlated with log C-reactive protein (Spearman rank correlation, -0.18; 95% CI, -0.30 to -0.06; P = .005). Higher serum concentrations of TMAO were not significantly associated with time to death (Spearman rank correlation, 0.84; CI, 0.65-1.09; P = .19) or time to cardiovascular hospitalization or cardiovascular death (Spearman rank correlation, 0.88; CI, 0.57-1.35; P = .55).

Conclusions: Serum TMAO concentrations were markedly elevated and correlated directly with biochemical markers of nutritional status and inversely with markers of inflammation in patients receiving HD. There was no significant association between serum TMAO concentrations and all-cause mortality, cardiovascular death, or hospitalizations. In patients receiving dialysis-in contrast with the general population-adverse vascular effects of TMAO may be counterbalanced by associations with nutritional or inflammatory status.

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Figures

Figure 1
Figure 1. Distribution of trimethylamine N Oxide levels in hemodialysis patients
Distribution of trimethylamine N Oxide (TMAO) by decile (lower figure) mean ± 2 standard deviations (upper figure) in 235 hemodialysis patients.
See this image and copyright information in PMC

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