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Mechanisms underlying the laxative effect of lactulose: A randomized placebo‐controlled trial showing increased small bowel water and motility unaltered by the 5‐HT3 receptor antagonist, ondansetron (2024)
Journal Article
Gunn, D., Yeldho, C., Hoad, C., Menys, A., Gowland, P., Marciani, L., & Spiller, R. (in press). Mechanisms underlying the laxative effect of lactulose: A randomized placebo‐controlled trial showing increased small bowel water and motility unaltered by the 5‐HT3 receptor antagonist, ondansetron. Neurogastroenterology and Motility, https://doi.org/10.1111/nmo.14754

Background: Lactulose is a laxative which accelerates transit and softens stool. Our aim was to investigate its mechanism of action and use this model of diarrhea to investigate the anti-diarrheal actions of ondansetron. Methods: A double-blind, ra... Read More about Mechanisms underlying the laxative effect of lactulose: A randomized placebo‐controlled trial showing increased small bowel water and motility unaltered by the 5‐HT3 receptor antagonist, ondansetron.

Randomised, placebo-controlled trial and meta-analysis show benefit of ondansetron for irritable bowel syndrome with diarrhoea: The TRITON trial (2023)
Journal Article
Gunn, D., Topan, R., Barnard, L., Fried, R., Holloway, I., Brindle, R., …Spiller, R. (2023). Randomised, placebo-controlled trial and meta-analysis show benefit of ondansetron for irritable bowel syndrome with diarrhoea: The TRITON trial. Alimentary Pharmacology and Therapeutics, 57(11), 1258-1271. https://doi.org/10.1111/apt.17426

Summary: Background: Ondansetron may be beneficial in irritable bowel syndrome with diarrhoea (IBS‐D). Aim: To conduct a 12‐week parallel group, randomised, double‐blind, placebo‐controlled trial of ondansetron 4 mg o.d. (titrated up to 8 mg t.d.s.)... Read More about Randomised, placebo-controlled trial and meta-analysis show benefit of ondansetron for irritable bowel syndrome with diarrhoea: The TRITON trial.

Psyllium reduces insulin-induced colonic gas production in irritable bowel syndrome: MRI and in vitro fermentation studies (2021)
Journal Article
Gunn, D., Abbas, Z., Harris, H., Major, G., Hoad, C., Gowland, P., …Spiller, R. (2022). Psyllium reduces insulin-induced colonic gas production in irritable bowel syndrome: MRI and in vitro fermentation studies. Gut, 71(5), 919-927. https://doi.org/10.1136/gutjnl-2021-324784

Objective: Health promoting dietary fibre including inulin often triggers gastrointestinal symptoms in patients with irritable bowel syndrome (IBS), limiting their intake. Our aim was to test if co-administering psyllium with inulin would reduce gas... Read More about Psyllium reduces insulin-induced colonic gas production in irritable bowel syndrome: MRI and in vitro fermentation studies.

Contrasting effects of viscous and particulate fibers on colonic fermentation in vitro and in vivo, and their impact on intestinal water studied by MRI in a randomized trial (2020)
Journal Article
Gunn, D., Murthy, R., Major, G., Wilkinson-Smith, V., Hoad, C., Marciani, L., …Spiller, R. (2020). Contrasting effects of viscous and particulate fibers on colonic fermentation in vitro and in vivo, and their impact on intestinal water studied by MRI in a randomized trial. American Journal of Clinical Nutrition, 112(3), 595–602. https://doi.org/10.1093/ajcn/nqaa173

Background Wheat bran, nopal, and psyllium are examples of particulate, viscous and particulate, and viscous fibers, respectively, with laxative properties yet contrasting fermentability. Objectives We assessed the fermentability of these fi... Read More about Contrasting effects of viscous and particulate fibers on colonic fermentation in vitro and in vivo, and their impact on intestinal water studied by MRI in a randomized trial.

Investigation of colonic motility (2019)
Book Chapter
CORSETTI, M., & GUNN, D. (2019). Investigation of colonic motility. In S. Rao, Y. Lee, & U. Ghosal (Eds.), Clinical and Basic Neurogastroenterology and Motility. Elsevier

Colonic Motility (2019)
Book Chapter
Gunn, D., & Corsetti, M. (2019). Colonic Motility. In E. Kuipers (Ed.), Encyclopedia of Gastroenterology(2nd). Elsevier

Editorial: understanding differences in patient response to ondansetron in irritable bowel syndrome with diarrhoea-are we any closer? Authors' reply (2019)
Journal Article
Gunn, D., Garsed, K., Lam, C., Singh, G., Lingaya, M., Wahl, V., …Spiller, R. (2019). Editorial: understanding differences in patient response to ondansetron in irritable bowel syndrome with diarrhoea-are we any closer? Authors' reply. Alimentary Pharmacology and Therapeutics, 50(7), 826-827. https://doi.org/10.1111/apt.15465

Treatment of Irritable Bowel Syndrome with diarrhoea using Titrated Ondansetron (TRITON): study protocol for a randomised control trial (2019)
Journal Article
Gunn, D., Fried, R., Lalani, R., Farrin, A., Holloway, I., Morris, T., …Spiller, R. (2019). Treatment of Irritable Bowel Syndrome with diarrhoea using Titrated Ondansetron (TRITON): study protocol for a randomised control trial. Trials, 20, Article 517. https://doi.org/10.1186/s13063-019-3562-6

Background – Irritable bowel syndrome with diarrhoea (IBS-D) affects up to 4% of the general population. Symptoms include frequent, loose, or watery stools with associated urgency, resulting in marked reduction of quality of life and loss of work pro... Read More about Treatment of Irritable Bowel Syndrome with diarrhoea using Titrated Ondansetron (TRITON): study protocol for a randomised control trial.

Abnormalities of mucosal serotonin metabolism and 5-HT3 receptor subunit 3C polymorphism in irritable bowel syndrome with diarrhoea predict responsiveness to ondansetron (2019)
Journal Article
Gunn, D., Garsed, K., Lam, C., Singh, G., Lingaya, M., Wahl, V., …Spiller, R. (2019). Abnormalities of mucosal serotonin metabolism and 5-HT3 receptor subunit 3C polymorphism in irritable bowel syndrome with diarrhoea predict responsiveness to ondansetron. Alimentary Pharmacology and Therapeutics, 50(5), 538-546. https://doi.org/10.1111/apt.15420

Background Irritable bowel syndrome with diarrhoea (IBS‐D) is a common condition, greatly reducing the quality of life with few effective treatment options available. Aims To report the beneficial response shown in our trial with the 5‐hydroyxtr... Read More about Abnormalities of mucosal serotonin metabolism and 5-HT3 receptor subunit 3C polymorphism in irritable bowel syndrome with diarrhoea predict responsiveness to ondansetron.

The mineralogy and fabric of 'Brickearths' in Kent, UK and their relationship to engineering behaviour (2015)
Journal Article
Milodowski, A. E., Northmore, K. J., Kemp, S. J., Entwisle, D. C., Gunn, D. A., Jackson, P. D., …Clarke, M. L. (2015). The mineralogy and fabric of 'Brickearths' in Kent, UK and their relationship to engineering behaviour. Bulletin of Engineering Geology and the Environment, 74(4), https://doi.org/10.1007/s10064-014-0694-5

Mineralogical and petrographical investigation of two loessic brickearth profiles from Ospringe and Pegwell Bay in north Kent, UK have differentiated two types of brickearth fabric that can be correlated with different engineering behaviour. Both seq... Read More about The mineralogy and fabric of 'Brickearths' in Kent, UK and their relationship to engineering behaviour.

Spatial monitoring of groundwater drawdown and rebound associated with quarry dewatering using automated time-lapse electrical resistivity tomography and distribution guided clustering (2015)
Journal Article
Chambers, J. E., Meldrum, P. I., Wilkinson, P. B., Ward, W. O., Jackson, C. R., Matthew, B., …Gunn, D. (2015). Spatial monitoring of groundwater drawdown and rebound associated with quarry dewatering using automated time-lapse electrical resistivity tomography and distribution guided clustering. Engineering Geology, 193, https://doi.org/10.1016/j.enggeo.2015.05.015

Dewatering systems used for mining and quarrying operations often result in highly artificial and complex groundwater conditions, which can be difficult to characterise and monitor using borehole point sampling approaches. Here automated time-lapse e... Read More about Spatial monitoring of groundwater drawdown and rebound associated with quarry dewatering using automated time-lapse electrical resistivity tomography and distribution guided clustering.