RESUMO
A number of experiments have been carried out to investigate the feasibility of using electrical impedance tomography as an alternative method for identifying gastro-oesophageal reflux. Five subjects have been studied using simultaneous EIT and intraoesophageal pH measurements. A refluxogenic meal was given during the course of the recording to induce reflux in the subjects. Results show that there is some change in conductivity in the stomach region during some of the reflux episodes, but EIT is not able to detect all of the pH changes associated with the reflux. Other large conductivity changes, relating to gastric motility can be detected at times when no reflux is occurring.
Assuntos
Impedância Elétrica , Refluxo Gastroesofágico/diagnóstico , Tomografia/métodos , Adulto , Esôfago/metabolismo , Feminino , Refluxo Gastroesofágico/metabolismo , Refluxo Gastroesofágico/fisiopatologia , Motilidade Gastrointestinal/fisiologia , Humanos , Concentração de Íons de Hidrogênio , Masculino , Sensibilidade e Especificidade , Fatores de Tempo , Tomografia/estatística & dados numéricosRESUMO
Investigations have been carried out using the Sheffield mark II real-time EIT system, to look at changes in conductivity associated with swallowing. A ring of 16 electrodes was placed around the neck of 10 subjects, who then performed swallows with four liquids of different conductivities, ranging from water (sigma = 0.03 mS cm-1) to salty soup (sigma = 35.8 mS cm-1). Results showed that the conductive and non-conductive liquids could be distinguished. Bolus transit times were calculated from region of interest curves, and the average transit time for the 10 subjects was found to be 320 +/- 100 ms.
Assuntos
Deglutição/fisiologia , Esôfago/fisiologia , Impedância Elétrica , Eletrodos , Feminino , Humanos , MasculinoRESUMO
Preliminary work has been carried out using the Sheffield mark II real time EIT system, looking for changes in conductivity which occur in the stomach and oesophagus following a swallow of a small volume of either a conducting or a non-conducting liquid. This has been done using three different configurations: a conventional transverse array placed around the thorax, a rosette array on the abdomen, and a rosette array placed on the back. Results show a significant difference between the two liquids, which can be detected equally well by the three electrode configurations.
