Gastroenterol Rep (Oxf). 2015 Feb;3(1):12-21. doi: 10.1093/gastro/gou068. Epub 2014 Oct 21.
Dynamic carbon 13 breath tests for the study of liver function and gastric emptying.
Gastroenterology report
Leonilde Bonfrate, Ignazio Grattagliano, Giuseppe Palasciano, Piero Portincasa
Affiliations
Affiliations
- Department of Biomedical Sciences and Human Oncology, Clinica Medica 'A. Murri', University of Bari Medical School, Bari, Italy and Italian College of General Practitioners, Florence and Bari, Italy.
- Department of Biomedical Sciences and Human Oncology, Clinica Medica 'A. Murri', University of Bari Medical School, Bari, Italy and Italian College of General Practitioners, Florence and Bari, Italy [email protected].
PMID: 25339354
PMCID: PMC4324868 DOI: 10.1093/gastro/gou068
Abstract
In gastroenterological practice, breath tests (BTs) are diagnostic tools used for indirect, non-invasive assessment of several pathophysiological metabolic processes, by monitoring the appearance in breath of a metabolite of a specific substrate. Labelled substrates originally employed radioactive carbon 14 ((14)C) and, more recently, the stable carbon 13 isotope ((13)C) has been introduced to label specific substrates. The ingested (13)C-substrate is metabolized, and exhaled (13)CO2 is measured by mass spectrometry or infrared spectroscopy. Some (13)C-BTs evaluate specific (microsomal, cytosolic, and mitochondrial) hepatic metabolic pathways and can be employed in liver diseases (i.e. simple liver steatosis, non-alcoholic steato-hepatitis, liver fibrosis, cirrhosis, hepatocellular carcinoma, drug and alcohol effects). Another field of clinical application for (13)C-BTs is the assessment of gastric emptying kinetics in response to liquids ((13)C-acetate) or solids ((13)C-octanoic acid in egg yolk or in a pre-packed muffin or the (13)C-Spirulina platensis given with a meal or a biscuit). Studies have shown that (13)C-BTs, used for gastric emptying studies, yield results that are comparable to scintigraphy and can be useful in detecting either delayed- (gastroparesis) or accelerated gastric emptying or changes of gastric kinetics due to pharmacological effects. Thus, (13)C-BTs represent an indirect, cost-effective and easy method of evaluating dynamic liver function and gastric kinetics in health and disease, and several other potential applications are being studied.
© The Author(s) 2014. Published by Oxford University Press and the Digestive Science Publishing Co. Limited.
Keywords: breath tests; gastric motility; hepatic metabolism; scintigraphy; stable isotope
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