title: Transcutaneous intraluminal impedance measurement for minimally invasive monitoring of gastric motility: validation in acute canine models.
abstract: Transcutaneous intraluminal impedance measurement (TIIM) is a new method to cutaneously measure gastric contractions by assessing the attenuation dynamics of a small oscillating voltage emitted by a battery-powered ingestible capsule retained in the stomach. In the present study, we investigated whether TIIM can reliably assess gastric motility in acute canine models. Methods. Eight mongrel dogs were randomly divided into 2 groups: half received an active TIIM pill and half received an identically sized sham capsule. After 24-hour fasting and transoral administration of the pill (active or sham), two force transducers (FT) were sutured onto the antral serosa at laparotomy. After closure, three standard cutaneous electrodes were placed on the abdomen, registering the transluminally emitted voltage. Thirty-minute baseline recordings were followed by pharmacological induction of gastric contractions using neostigmine IV and another 30-minute recording. Normalized one-minute baseline and post-neostigmine gastric motility indices (GMIs) were calculated and Pearson correlation coefficients (PCCs) between cutaneous and FT GMIs were obtained. Statistically significant GMI PCCs were seen in both baseline and post-neostigmine states. There were no significant GMI PCCs in the sham capsule test. Further chronic animal studies of this novel long-term gastric motility measurement technique are needed before testing it on humans.
authors.affiliation: Centre for Bioengineering and Research, University of Calgary, Engineering Complex, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4.
authors.forename: Michael D
authors.initials: MD
authors.lastname: Poscente
authors.affiliation: Centre for Bioengineering and Research, University of Calgary, Engineering Complex, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4.
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
authors.affiliation: Department of Electrical and Computer Engineering, University of Calgary, Engineering Complex, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4.
authors.forename: Dobromir
authors.initials: D
authors.lastname: Filip
authors.affiliation: Division of Pediatrics, Faculty of Medicine, University of Calgary, Calgary, AB, Canada T2N 1N4.
authors.forename: Polya
authors.initials: P
authors.lastname: Ninova
authors.affiliation: Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada T2N 1N4.
authors.forename: Gregory
authors.initials: G
authors.lastname: Muench
authors.affiliation: Department of Electrical and Computer Engineering, University of Calgary, Engineering Complex, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4.
authors.forename: Orly
authors.initials: O
authors.lastname: Yadid-Pecht
authors.affiliation: Centre for Bioengineering and Research, University of Calgary, Engineering Complex, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4 ; Department of Electrical and Computer Engineering, University of Calgary, Engineering Complex, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4 ; Department of Surgery, Faculty of Medicine, University of Alberta, Edmonton, AB, Canada T6G 2B7.
authors.forename: Martin P
authors.initials: MP
authors.lastname: Mintchev
authors.affiliation: Division of Gastroenterology, Faculty of Medicine, University of Calgary, Calgary, AB, Canada T2N 1N4.
authors.forename: Christopher N
authors.initials: CN
authors.lastname: Andrews