Association of gut-related metabolites with outcome in acute heart failure

Jan 17, 2021American heart journal

Gut-related chemicals linked to outcomes in sudden heart failure

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Abstract

In a study of 806 plasma samples from acute heart failure patients, TMAO and carnitine-related metabolites were linked to mortality outcomes.

TMAO, trimethyllysine, L-carnitine, acetyl-L-carnitine, and γ-butyrobetaine are associated with increased risk of death and rehospitalization due to heart failure at both 30 days and 1 year.
The hazard ratios for these metabolites ranged from 1.15 to 1.49, with statistical significance (P≤ .021 to P≤ .026) when adjusted for cardiac risk factors.
L-carnitine and acetyl-L-carnitine were found to be more predictive of short-term outcomes, while TMAO was more predictive of long-term outcomes.
Acetyl-L-carnitine and L-carnitine improved risk stratification for in-hospital mortality when combined with existing clinical risk scores, with odds ratios of 1.52 or higher (P≤ .020).
Further investigation into the role of carnitine metabolites in heart failure pathogenesis is suggested.

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BACKGROUND: Trimethylamine N-oxide (TMAO), a gut-related metabolite, is associated with heart failure (HF) outcomes. However, TMAO is the final product of a complex metabolic pathway (ie, choline/carnitine) that has never been entirely investigated in HF. The present study investigates a panel of metabolites involved in the TMAO-choline/carnitine metabolic pathway for their associations with outcome in acute HF patients.

METHODS: In total, 806 plasma samples from acute HF patients were analyzed for TMAO, trimethyllysine, L-carnitine, acetyl-L-carnitine, γ-butyrobetaine, crotonobetaine, trimethylamine, betaine aldehyde, choline, and betaine using a developed liquid chromatography-tandem mass spectrometry method. Associations with outcome of all-cause mortality (death) and a composite of all-cause mortality and/or rehospitalization caused by HF (death/HF) at 30 days and 1 year were investigated.

RESULTS: TMAO, trimethyllysine, L-carnitine, acetyl-L-carnitine, and γ-butyrobetaine were associated with death and death/HF at 30 days (short term; hazard ratio 1.30-1.49, P≤ .021) and at 1 year (long term; hazard ratio 1.15-1.25, P≤ .026) when adjusted for cardiac risk factors. L-carnitine and acetyl-L-carnitine were superior for short-term outcomes whereas TMAO was the superior metabolite for association with long-term outcomes. Furthermore, acetyl-L-carnitine and L-carnitine were superior for in-hospital mortality and improved risk stratification when combined with current clinical risk scores (ie, Acute Decompensated HEart Failure National REgistry, Organized Program To Initiate Lifesaving Treatment In Hospitalized Patients With Heart Failure, and Get With The Guidelines-Heart Failure; odds ratio (OR) ≥ 1.52, P≤ .020).

CONCLUSIONS: Carnitine-related metabolites show associations with adverse outcomes in acute HF, in particular L-carnitine and acetyl-L-carnitine for short-term outcomes, and TMAO for long-term outcomes. Further studies are warranted to investigate the role and implications of carnitine metabolites including intervention in the pathogenesis of HF.

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Association of gut-related metabolites with outcome in acute heart failure

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