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      Bromhidrosis por trimetilaminuria. Dificultades en su diagnóstico y tratamiento Translated title: Bromhidrosis caused by trimethylaminuria. Difficulties in its diagnosis and treatment

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          Abstract

          Resumen La trimetilaminuria es una causa de bromhidrosis, que hay que tener en cuenta en niños prepúberes con un desarrollo normal. Su relación con la ingesta, sobre todo de pescado marino, nos hará sospechar su existencia, que deberemos confirmar mediante el análisis de la excreción urinaria de trimetilamina y el estudio genético. Presentamos cuatro casos de trimetilaminuria donde se analizan y discuten las fórmulas más empleadas para valorar una excreción urinaria aumentada de trimetilamina, su correlación con la gravedad del cuadro y con el rendimiento de las pruebas genéticas. Por último, se describen los tratamientos empleados y se realiza una propuesta de tratamiento, basada en las recomendaciones dietéticas y en el asesoramiento a los padres para un mejor conocimiento y manejo de la enfermedad.

          Translated abstract

          Abstract Trimethylaminuria is a cause of bromhidrosis to be considered in pre-pubertal children, with normal development. Its relation with the ingestion, especially of marine fish, will make us suspect its existence that we will have to confirm by means of the analysis of the urinary excretion of trimetilamine and the genetic study. We present four cases of trimethylaminuria where the most used formulas to assess increased urinary excretion of trimethylamine are analysed and discussed, as well as their correlation with the severity of the disease and with the performance of genetic tests. Finally, the used treatments are described, and a treatment proposal is made, based on dietary recommendations and advices to parents for a better understanding and management of the disease.

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          Trimethylaminuria: causes and diagnosis of a socially distressing condition.

          Trimethylaminuria is a disorder in which the volatile, fish-smelling compound, trimethylamine (TMA) accumulates and is excreted in the urine, but is also found in the sweat and breath of these patients. Because many patients have associated body odours or halitosis, trimethylaminuria sufferers can meet serious difficulties in a social context, leading to other problems such as isolation and depression. TMA is formed by bacteria in the mammalian gut from reduction of compounds such as trimethylamine-N-oxide (TMAO) and choline. Primary trimethylaminuria sufferers have an inherited enzyme deficiency where TMA is not efficiently converted to the non-odorous TMAO in the liver. Secondary causes of trimethylaminuria have been described, sometimes accompanied by genetic variations. Diagnosis of trimethylaminuria requires the measurement of TMA and TMAO in urine, which should be collected after a high substrate meal in milder or intermittent cases, most simply, a marine-fish meal. The symptoms of trimethylaminuria can be improved by changes in the diet to avoid precursors, in particular TMAO which is found in high concentrations in marine fish. Treatment with antibiotics to control bacteria in the gut, or activated charcoal to sequester TMA, may also be beneficial.
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            Diagnosis and management of trimethylaminuria (FMO3 deficiency) in children.

            Persistent trimethylaminuria in children is caused by autosomal recessively inherited impairment of hepatic trimethylamine (TMA) oxidation due to deficiency of flavin monooxygenase 3 (FMO3) secondary to mutations in the FMO3 gene. Trimethylaminuria or 'fish odour syndrome' is due to excessive excretion into body fluids and breath of TMA derived from the enterobacterial metabolism of dietary precursors. The disorder is present from birth but becomes apparent as foods containing high amounts of choline or of trimethylamine N-oxide (TMAO) from marine (sea or saltwater) fish are introduced into the diet. In our experience, trimethylaminuria (FMO3 deficiency) in children is rare. We have compared the dynamics and diagnostic efficacy of choline loading with marine fish meals in six children with trimethylaminuria. Loading with a marine fish meal provides a simple and acceptable method for confirmation of diagnosis of suspected trimethylaminuria in children, with the effects being cleared more quickly than with a choline load test. However, oral loading with choline bitartrate allows estimation of residual oxidative capacity in vivo and is a useful adjunct to molecular studies. Patients homozygous for the 'common' P153L mutation in the FMO3 gene showed virtual complete lack of residual TMA N-oxidative capacity, consistent with a nonfunctional or absent FMO3 enzyme, whereas a patient with the M82T mutation showed some residual oxidative capacity. A patient compound heterozygous for two novel mutations, G193E and R483T, showed considerable residual N-oxidative capacity. A further patient, heterozygous for two novel sequence variations in the FMO3 gene, consistently showed malodour and elevated urinary TMA/TMAO ratios under basal conditions but a negative response to both choline and marine fish meal loading. Comparison of the effects of administration of antibiotics (metronidazole, amoxicillin, neomycin) on gut bacterial production of trimethylamine from choline showed they all reduced TMA production to a limited extent, with neomycin being most effective. 'Best-practice' diagnostic and treatment guidelines are summarized.
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              Treatments of trimethylaminuria: where we are and where we might be heading.

              Trimethylamine (TMA) is a volatile, foul-smelling, diet-derived amine, primarily generated in the colon and metabolized in the liver to its odorless N-oxide (TMAO). In primary trimethylaminuria (TMAU), an inherited deficiency in flavin-containing monooxygenase 3 leads to elevated systemic TMA levels. The excretion of elevated amounts of TMA in sweat, breath, urine and other bodily secretions gives individuals affected by TMAU a smell resembling that of rotten fish. Although the disorder might not seem an important health problem, its social and psychological burden can be devastating. To date, no treatment modifying the disorder exists and only a few pharmacological therapies provide modest and transient benefits. This review provides an overview of investigated TMAU treatments and outlines promising new research directions.
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                Author and article information

                Journal
                pap
                Pediatría Atención Primaria
                Rev Pediatr Aten Primaria
                Asociación Española de Pediatría de Atención Primaria (Madrid, Madrid, Spain )
                1139-7632
                December 2021
                : 23
                : 92
                : e151-e155
                Affiliations
                [3] Almería orgnameÁrea de Gestión Sanitaria Norte de Almería orgdiv1Hospital La Inmaculada orgdiv2Unidad de Gestión Clínica Pediatría España
                [1] Hospitalet de Llobregat Barcelona orgnameÁrea Básica de Salud Collblanc España
                [2] Almería orgnameComplejo Hospitalario Universitario Torrecárdenas orgdiv1Unidad de Gestión Clínica Urgencias España
                Article
                S1139-76322021000400013 S1139-7632(21)02309200013
                ee3e8279-7e84-4e42-8ee3-7a51f95d9a31

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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                SciELO Spain

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                Notas Clínicas

                Children,Fishy odor,Trimethylaminuria,Niños,Bromhidrosis,Olor a pescado,Trimetilaminuria

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