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Irritable Bowel Syndrome: HELP
Articles by Susan Pritchard
Based on 6 articles published since 2010
(Why 6 articles?)
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Between 2010 and 2020, S. Pritchard wrote the following 6 articles about Irritable Bowel Syndrome.
 
+ Citations + Abstracts
1 Clinical Trial Colonic response to laxative ingestion as assessed by MRI differs in constipated irritable bowel syndrome compared to functional constipation. 2016

Lam, C / Chaddock, G / Marciani, L / Costigan, C / Paul, J / Cox, E / Hoad, C / Menys, A / Pritchard, S / Garsed, K / Taylor, S / Atkinson, D / Gowland, P / Spiller, R. ·NIHR Nottingham Digestive Diseases Biomedical Research Unit and Nottingham Digestive Diseases Centre, School of Medicine, University of Nottingham, Nottingham, UK. · Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, UK. · Centre for Medical Imaging, Division of Medicine, University College London, London, UK. · Royal Derby Hospitals Foundation Trust, Derby, UK. ·Neurogastroenterol Motil · Pubmed #26871949.

ABSTRACT: BACKGROUND: Functional constipation (FC) and irritable bowel syndrome with constipation (IBS-C) share many symptoms but underlying mechanisms may be different. We have developed a magnetic resonance imaging (MRI) technique to measure intestinal volumes, transit, and motility in response to a laxative, Moviprep(®) . We aim to use these biomarkers to study the pathophysiology in IBS-C and FC. METHODS: Twenty-four FC and 24 IBS-C were studied. Transit was assessed using the weighted average position score (WAPS) of five MRI marker pills, taken 24 h before MRI scanning. Following baseline scan, participants ingested 1 L of Moviprep(®) followed by hourly scans. Magnetic resonance imaging parameters and bowel symptoms were scored from 0 to 4 h. KEY RESULTS: Weighted average position score for FC was 3.6 (2.5-4.2), significantly greater than IBS-C at 2.0 (1.5-3.2), p = 0.01, indicating slower transit for FC. Functional constipation showed greater fasting small bowel water content, 83 (63-142) mL vs 39 (15-70) mL in IBS-C, p < 0.01 and greater ascending colon volume (AC), 314 (101) mL vs 226 (71) mL in IBS-C, p < 0.01. FC motility index was lower at 0.055 (0.044) compared to IBS-C, 0.107 (0.070), p < 0.01. Time to first bowel movement following ingestion of Moviprep(®) was greater for FC, being 295 (116-526) min, compared to IBS-C at 84 (49-111) min, p < 0.01, and correlated with AC volume 2 h after Moviprep(®) , r = 0.44, p < 0.01. Using a cut-off >230 min distinguishes FC from IBS-C with low sensitivity of 55% but high specificity of 95%. CONCLUSION & INFERENCES: Our objective MRI biomarkers allow a distinction between FC and IBS-C.

2 Article Increased fasting small-bowel water content in untreated coeliac disease and scleroderma as assessed by magnetic resonance imaging. 2019

Lam, Ching / Sanders, David S / Lanyon, Peter / Garsed, Klara / Foley, Stephen / Pritchard, Susan / Marciani, Luca / Hoad, Caroline L / Costigan, Carolyn / Gowland, Penny / Spiller, Robin. ·Nottingham Digestive Diseases Centre, University of Nottingham and National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and University of Nottingham, Nottingham, UK. · Sheffield Teaching Hospitals NHS Foundation Trust and University of Sheffield, Sheffield, UK. · Nottingham University Hospitals Trust, Nottingham, UK. · Derby Teaching Hospitals NHS Foundation Trust, Derby, UK. · Sherwood Forest Hospitals NHS Foundation Trust, Mansfield, UK. · Sir Peter Mansfield Magnetic Resonance Centre, University of Nottingham, UK. ·United European Gastroenterol J · Pubmed #31839961.

ABSTRACT: Background and aims: The regular overnight migrating motor complex (MMC) ensures that the normal fasting small-bowel water content (SBWC) is minimised. We have applied our recently validated non-invasive magnetic resonance technique to assess SBWC in newly diagnosed coeliac disease (CD), scleroderma (SCD) and irritable bowel syndrome (IBS), conditions possibly associated with small intestinal bacterial overgrowth (SIBO). Methods: A total of 20 CD and 15 SCD patients with gastrointestinal symptoms were compared to 20 healthy volunteers (HV) and 26 IBS with diarrhoea (IBS-D) patients, as previously reported. All underwent a fasting magnetic resonance imaging (MRI) scan on a 1.5 T Philips Achieva MRI scanner to assess fasting SBWC and colonic volumes. Stool and symptom diaries were completed for one week. Results: Compared to HV, all patients had significantly increased stool frequency and Bristol stool form score. SBWC was significantly increased in CD (median 109 mL; interquartile range (IQR) 53-224 mL) compared to HV (median 53 mL; IQR 31-98 mL; Conclusion: Fasting SBWC as assessed by MRI is significantly increased in newly diagnosed CD and SCD but decreased in IBS-D. Future studies should test whether increased resting fluid predisposes to SIBO.

3 Article Response to Uno. 2017

Lam, Ching / Chaddock, Gemma / Laurea, Luca Marciani / Costigan, Carolyn / Cox, Eleanor / Hoad, Caroline / Pritchard, Susan / Gowland, Penny / Spiller, Robin. ·NIHR Biomedical Research Unit in Gastrointestinal and Liver Diseases, Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK. · Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, UK. ·Am J Gastroenterol · Pubmed #28725068.

ABSTRACT: -- No abstract --

4 Article Distinct Abnormalities of Small Bowel and Regional Colonic Volumes in Subtypes of Irritable Bowel Syndrome Revealed by MRI. 2017

Lam, Ching / Chaddock, Gemma / Marciani Laurea, Luca / Costigan, Carolyn / Cox, Eleanor / Hoad, Caroline / Pritchard, Susan / Gowland, Penny / Spiller, Robin. ·NIHR Biomedical Research Unit in Gastrointestinal and Liver Diseases, Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK. · Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, UK. ·Am J Gastroenterol · Pubmed #27958282.

ABSTRACT: OBJECTIVES: Non-invasive biomarkers which identify different mechanisms of disease in subgroups of irritable bowel syndrome (IBS) could be valuable. Our aim was to seek useful magnetic resonance imaging (MRI) parameters that could distinguish each IBS subtypes. METHODS: 34 healthy volunteers (HV), 30 IBS with diarrhea (IBS-D), 16 IBS with constipation (IBS-C), and 11 IBS with mixed bowel habit (IBS-M) underwent whole-gut transit and small and large bowel volumes assessment with MRI scans from t=0 to t=360 min. Since the bowel frequency for IBS-M were similar to IBS-D, IBS-M and IBS-D were grouped together and labeled as IBS non-constipation group (IBS-nonC). RESULTS: Median (interquartile range): fasting small bowel water content in IBS-nonC was 21 (10-42), significantly less than HV at 44 ml (15-70), P<0.01 as was the postprandial area under the curve (AUC) P<0.01. The fasting transverse colon volumes in IBS-C were significantly larger at 253 (200-329) compared with HV, IBS-nonC whose values were 165 (117-255) and 198 (106-270) ml, respectively, P=0.02. Whole-gut transit time for IBS-C was prolonged at 69 (51-111), compared with HV at 34 (4-63) and IBS-D at 34 (17-78) h, P=0.03. Bloating score (VAS 0-10 cm) correlated with transverse colon volume at t=405 min, Spearman r=0.21, P=0.04. CONCLUSIONS: The constricted small bowel in IBS-nonC and the dilated transverse colon in IBS-C point to significant differences in underlying mechanisms of disease.

5 Article Colon Hypersensitivity to Distension, Rather Than Excessive Gas Production, Produces Carbohydrate-Related Symptoms in Individuals With Irritable Bowel Syndrome. 2017

Major, Giles / Pritchard, Sue / Murray, Kathryn / Alappadan, Jan Paul / Hoad, Caroline L / Marciani, Luca / Gowland, Penny / Spiller, Robin. ·Nottingham Digestive Diseases Centre, University of Nottingham, Nottingham, United Kingdom. · Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, United Kingdom. · Nottingham Digestive Diseases Centre, University of Nottingham, Nottingham, United Kingdom. Electronic address: robin.spiller@nottingham.ac.uk. ·Gastroenterology · Pubmed #27746233.

ABSTRACT: BACKGROUND & AIMS: Poorly digested, fermentable carbohydrates may induce symptoms of irritable bowel syndrome (IBS) via unclear mechanisms. We performed a randomized trial with magnetic resonance imaging (MRI) analysis to investigate correlations between symptoms and changes in small- and large-bowel contents after oral challenge. METHODS: We performed a 3-period, cross-over study of 29 adult patients with IBS (based on Rome III criteria, with symptoms of abdominal pain or discomfort for at least 2 days/wk) and reported bloating. In parallel, we performed the same study of 29 healthy individuals (controls). Studies were performed in the United Kingdom from January 2013 through February 2015. On 3 separate occasions (at least 7 days apart), subjects were given a 500-mL drink containing 40 g of carbohydrate (glucose in the first period, fructose in the second, and inulin in the third, in a random order). Levels of breath hydrogen were measured and intestinal content was assessed by MRI before and at various time points after consumption of each drink. Symptoms were determined based on subjects' responses to the Hospital Anxiety and Depression Scale questionnaire and the Patient Health Questionnaire-15. The primary end point was whether participants had a clinically important symptom response during the 300 minutes after consumption of the drink. RESULTS: More patients with IBS reached the predefined symptom threshold after intake of inulin (13 of 29) or fructose (11 of 29) than glucose (6 of 29). Symptoms peaked sooner after intake of fructose than inulin. Fructose increased small-bowel water content in both patients and controls whereas inulin increased colonic volume and gas in both. Fructose and inulin increased breath hydrogen levels in both groups, compared with glucose; fructose produced an earlier increase than inulin. Controls had lower symptom scores during the period after drink consumption than patients with IBS, despite similar MRI parameters and breath hydrogen responses. In patients who reached the symptom threshold after inulin intake, peak symptom intensity correlated with peak colonic gas (r = 0.57; P < .05). Changes in MRI features and peak breath hydrogen levels were similar in patients who did and did not reach the symptom threshold. CONCLUSIONS: Patients with IBS and healthy individuals without IBS (controls) have similar physiological responses after intake of fructose or inulin; patients reported symptoms more frequently after inulin than controls. In patients with a response to inulin, symptoms related to levels of intraluminal gas, but peak gas levels did not differ significantly between responders, nonresponders, or controls. This indicates that colonic hypersensitivity to distension, rather than excessive gas production, produces carbohydrate-related symptoms in patients with IBS. Clinicaltrials.gov no: NCT01776853.

6 Article Fasting and postprandial volumes of the undisturbed colon: normal values and changes in diarrhea-predominant irritable bowel syndrome measured using serial MRI. 2014

Pritchard, S E / Marciani, L / Garsed, K C / Hoad, C L / Thongborisute, W / Roberts, E / Gowland, P A / Spiller, R C. ·Sir Peter Mansfield Magnetic Resonance Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK. ·Neurogastroenterol Motil · Pubmed #24131490.

ABSTRACT: BACKGROUND: Previous assessments of colon morphology have relied on tests which were either invasive or used ionizing radiation. We aimed to measure regional volumes of the undisturbed colon in healthy volunteers (HV) and patients with diarrhea-predominant irritable bowel syndrome (IBS-D). METHODS: 3D regional (ascending, transverse, and descending) colon volumes were measured in fasting abdominal magnetic resonance (MR) images of 75 HVs and 25 IBS-D patients. Thirty-five of the HV and all 25 IBS-D subjects were fed a standard meal and postprandial MRI data obtained over 225 min. KEY RESULTS: Colonic regions were identified and 3D maps from cecum to sigmoid flexure were defined. Fasted regional volumes showed wide variation in both HVs being (mean ± SD) ascending colon (AC) 203 ± 75 mL, transverse (TC) 198 ± 79 mL, and descending (DC) 160 ± 86 mL with no difference from IBS-D subjects (AC 205 ± 69 mL, TC 232 ± 100 mL, and DC 151 ± 71 mL, respectively). The AC volume expanded by 10% after feeding (p = 0.007) in the 35 HV possibly due to increased ileo-colonic inflow. A later rise in AC volume occurred from t = 90 to t = 240 min as the meal residue entered the cecum. In contrast, IBS-D subjects showed a much reduced postprandial response of the AC (p < 0.0001) and a greater increase in TC volume after 90 min (p = 0.0244) compared to HV. CONCLUSIONS & INFERENCES: We have defined a normal range of the regional volumes of the undisturbed colon in fasted and fed states. The AC in IBS-D appeared less able to accommodate postprandial inflow which may account for faster colonic transit.