Wikipedia

Functional gastrointestinal disorder

Functional gastrointestinal disorders (FGID), also known as disorders of gut–brain interaction, include a number of separate idiopathic disorders which affect different parts of the gastrointestinal tract and involve visceral hypersensitivity and motility disturbances.[1]

Functional gastrointestinal disorder
Other namesDisorders of gut–brain interaction
SpecialtyGastroenterology

Definition

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Using the Delphi method, the Rome Foundation and its board of directors, chairs and co-chairs of the ROME IV committees developed the current definition for disorders of gut-brain interaction.[2]

A group of disorders classified by GI symptoms related to any combination of:[2]

Classification

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Terms such as functional colonic disease (or functional bowel disorder) refer in medicine to a group of bowel disorders which are characterized by chronic abdominal complaints without a structural or biochemical cause that could explain symptoms. Other functional disorders relate to other aspects of the process of digestion.[1]

The consensus review process of meetings and publications organised by the Rome Foundation, known as the Rome process, has helped to define the functional gastrointestinal disorders.[3] Successively, the Rome I, Rome II, Rome III and Rome IV proposed consensual classification system and terminology, as recommended by the Rome Coordinating Committee. These now include classifications appropriate for adults, children and neonates/toddlers.[1]

The current ROME IV classification, published in 2016, is as follows:[1]

A. Esophageal disorders

B. Gastroduodenal disorders

C. Bowel disorders

D. Centrally mediated disorders of gastrointestinal pain

E. Gallbladder and sphincter of Oddi disorders

F. Anorectal disorders

G. Childhood functional GI disorders: Neonate/Toddler

  • G1. Infant regurgitation
  • G2. Rumination syndrome
  • G3. Cyclic vomiting syndrome (CVS)
  • G4. Infant colic
  • G5. Functional diarrhea
  • G6. Infant dyschezia
  • G7. Functional constipation

H. Childhood functional GI disorders: Child/Adolescent

  • H1. Functional nausea and vomiting disorders
    • H1a. Cyclic vomiting syndrome (CVS)
    • H1b. Functional nausea and functional vomiting
      • H1b1. Functional nausea
      • H1b2. Functional vomiting
    • H1c. Rumination syndrome
    • H1d. Aerophagia
  • H2. Functional abdominal pain disorders
    • H2a. Functional dyspepsia
      • H2a1. Postprandial distress syndrome
      • H2a2. Epigastric pain syndrome
    • H2b. Irritable bowel syndrome (IBS)
    • H2c. Abdominal migraine
    • H2d. Functional abdominal pain ‒ NOS
  • H3. Functional defecation disorders
    • H3a. Functional constipation
    • H3b. Nonretentive fecal incontinence

Causes

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FGIDs share in common any of several physiological features including increased motor reactivity, enhanced visceral hypersensitivity, altered mucosal immune and inflammatory function (associated with bacterial dysbiosis), and altered central nervous system and enteric nervous system (CNS-ENS) regulation.

The pathophysiology of FGID has been best conceptualized using biopsychosocial model help to explain the relationships between an individual factors in their early life that in turn can influence their psychosocial factor and physiological functioning. This model also shows the complex interactions between these factors through the brain-gut axis.[4][5][6][7][8] These factors affect how FGID manifest in terms of symptoms but also affect the clinical outcome. These factors are interconnected and the influences on these factors are bidirectional and mutually interactive.

Early life factors

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Early life factors include genetic factors, psychophysiological and sociocultural factors, and environmental exposures.

  • Genetics – Several polymorphisms and candidate genes may predispose individuals to develop FGID. These include alpha-2 adrenergic and 5-HT receptors; serotonin and norepinephrine transporters (SERT, NET); inflammatory markers interleukin-(IL)10, tumor necrosis factor-(TNF) alpha, and TNF super family member 15 (TNF-SF15); intracellular cell signaling (G proteins); and ion channels (SCN5A).[9] However, the expression of a FGID requires the influence of additional environmental exposures such as infection, illness modeling and other factors.
  • Psychophysiological factors may affect the expression of these genes, thus leading to symptoms production associated with FGID.[10]
  • Sociocultural factors and family interactions have been shown to shape later reporting of symptoms, the development of FGIDs, and health care seeking. The expression of pain varies across cultures as well including denial of symptoms to dramatic expression.[11]
  • Environmental exposures  – Prior studies have shown the effect of environmental exposures in relation to the development of FGIDs. Environmental exposures such as childhood salmonella infection can be a risk factor for IBS in adulthood.[12]

Psychosocial factors

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There is a strong link between FGIDs and psychosocial factors. Psychosocial factors influence the functioning of the GI tract through the brain-gut axis, including the GI tract's motility, sensitivity, and barrier function. Psychosocial factors also affect experience and behavior, treatment selection, and clinical outcome.

Psychological stress or one's emotional response to stress exacerbates gastrointestinal symptoms and may contribute to FGID development and maintenance.[2][13] Specifically in children and adolescents, anxiety and depression may present as FGID-associated somatic complaints, such as nausea, vomiting, and abdominal pain.[14] Similarly, anxiety in individuals with FGIDs is linked to greater pain severity, frequency, duration, chronicity, and disabling effects.[15] This is because psychological stress can impact the gut's mucosal barrier functions, allowing bacteria and bacterial products to migrate and cause pain, diarrhea, and other GI symptoms. Conversely, since the brain-gut axis is bidirectional, GI inflammation and injury can amplify pain signals to the brain and contribute to worsened mental status, including anxiety and depression symptoms.[1]

Individuals with FGIDs may also experience poor socialization. Due to the nature of the disease, individuals with an FGID may have difficulty with regular school or work attendance and participation in extracurricular activities, leading to isolation and a lack of peer support. This lack of peer support may lead to depression and loneliness, conditions which exacerbate FGIDs symptoms.[16] In addition, children with FGIDs are more likely to experience bullying. As such, stressful situations which influence socialization (seen as either a lack thereof or negative experiences) may lead to an impaired functioning in patients with FGIDs.[17]

Family interactions may also play a role in the development of FGIDs through their effects on the physical and psychosocial functioning of an individual. Family factors which may influence the development of an FGID include child attachment style, maladaptive parenting behaviors (paternal rejection and hostility), and even the parents' health status, as children of chronically ill parents experience increased somatization, insecure attachment, and worsened biopsychosocial functioning.[18] Each of these factors leads to the accumulation of stressors, which can ultimately lead to the development of an FGID. In addition, family units which have a member with an FGIDs diagnosis are more likely to face family functioning difficulties, including challenges to familial roles, communication, affective involvement, organization, and cohesion. These challenges arise due to the nature of the disease, and ultimately worsen symptoms for the FGID patient.[18][19]

Physiology

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The physiology of FGID is characterized by abnormal motility, visceral hypersensitivity as well as dysregulation of the immune system and barrier function of the GI tract as well as inflammatory changes.

  • Abnormal motility
    Studies have shown altered muscle contractility and tone, bowel compliance, and transit may contribute to many of the gastrointestinal symptoms of FGID which may include diarrhea, constipation, and vomiting.[20]
  • Visceral hypersensitivity
    In FGID there is poor association of pain with GI motility in many functional GI disorders. These patient often have a lower pain threshold with balloon distension of the bowel (visceral hyperalgesia), or they have increased sensitivity even to normal intestinal function; Visceral hypersensitivity may be amplified in patients with FGIDs.[21][22]
  • Immune dysregulation, inflammation, and barrier dysfunction
    Studies on postinfectious IBS have shown that factors such as mucosal membrane permeability, the intestinal flora, and altered mucosal immune function. Ultimately leading to visceral hypersensitivity. Factors contributing to this occurrence include genetics, psychological stress, and altered receptor sensitivity at the gut mucosa and myenteric plexus, which are enabled by mucosal immune dysfunction.[23][24]
  • Microbiome
    There has been increased attention to the role of bacteria and the microbiome in overall health and disease. There is evidence for a group of microorganisms which play a role in the brain-gut axis.[25] Studies have revealed that the bacterial composition of the gastrointestinal tract in IBS patient differs from healthy individuals (e.g., increased Firmicutes and reduced Bacteroidetes and Bifidobacteria)[26] However, further research is needed to determine the role of the microbiome in FGIDs.
  • Food and diet
    The types of food consumed and diet consumed plays a role in the manifestation of FGID[27] and also their relationship to intestinal microbiota.[28] Studies have shown that specific changes in diet (e.g., low FODMAP—fermentable oligo-, di-, and monosaccharides and polyols, or gluten restriction in some patients) may help and reduce the symptom burden in FGID. However, no one diet has been shown to be recommended for all people.

Brain-gut axis

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The brain-gut axis is a bidirectional mechanism in which psychosocial factors influence the GI tract and vice versa. Specifically, the emotional and cognitive centers of the brain influence GI activity and immune cell function, and the microbes within the gut regulate mood, cognition, and mental health.[29] These two systems interact through several mechanisms. There are direct, physical connections between the central nervous system and nerve plexuses to the visceral muscles. In addition, neurotransmitters send signals related to thoughts, feelings, and pain regulation from the brain to the GI tract. The brain-gut axis influences the entire body through a variety of pathways; it regulates sensory, motor, endocrine, autonomic, immune, and inflammatory reactions. Within the physical and psychological interactions of FGIDs specifically, psychiatric disorders such as anxiety, depression, and even autism are well-linked to GI dysfunction. Conversely, functional GI diseases are linked to several comorbid psychiatric diseases.[29] Negative emotions such as fear, anxiety, anger, stress, and pain may delay gastric emptying, decrease intestinal and colonic transit time, and induce defecation and diarrhea.[1]

Treatments

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Psychotherapeutic treatments

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Because FGIDs are known to be multifactorial with external stressors and environmental factors playing a role in their development, current research demonstrates that psychological treatments may be effective in relieving some symptoms of the disease. Interventions such as cognitive behavioral therapy (CBT), hypnotherapy, and biofeedback-assisted relaxation training (BART) each show promise in symptom reduction.[30] Each of these therapies aims to alter an individual's thought patterns and behaviors while improving self-efficacy, which all work together to improve health outcomes.

Cognitive behavioral therapy is a treatment based on the theory that thinking affects one's feelings and behaviors. As such, alterations in one's thought process can have a positive or negative effect on actions and perceptions. Through the lens of FGIDs, a negative thought pattern may be associated with a negative physical experience of abdominal pain, discomfort, and general sickness. In theory, retraining the patient's thought patterns can alleviate these symptoms and improve quality of life. In patients with FGIDs, CBT is an effective treatment option; one study found 87.5% of participants to be completely pain-free following treatment.[16] Internet-based CBT (iCBT) is similarly effective, and may be a good treatment option for individuals who either cannot afford or otherwise lack access to traditional CBT.[31]

Hypnotherapy, another method for reducing symptoms of FGIDs, teaches users how to alter their perception of uncomfortable sensations in the body. Gut-directed hypnotherapy specifically gives greater improvements in symptoms than standard treatment of the disease.[18] Research demonstrates directed hypnotherapy to be an effective mechanism of reducing visceral hypersensitivity (a low pain threshold of the internal organs) and sympathetic activity, due to the reduced activity of the anterior cingulated cortex and state of relaxation achieved during hypnosis.[32] For patients with irritable bowel syndrome (IBS) and functional abdominal pain (FAP), hypnotherapy reduces pain intensity and frequency.[30]

BART therapies monitor the physiological changes occurring with thoughts, feelings, and emotions. These therapies aim to teach patients how to visualize the effects of the interventions they are undergoing. BART is used to improve mood and somatic responses to anxiety disorders, which may relieve some of the psychological and physiological symptoms of FGIDs.[33] The visual, real-time feedback given through BART empowers the patient to see the difference that the therapy is making, thus giving the patient control over the physiological components of the disease. This allows the patient to maximize their mind-body connection and eventually optimize symptom management and quality of life. BART allows the patient to break the positive feedback loop of anxiety and pain, thus reducing disease exacerbations.

Pharmaceutical treatments

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Antidepressants have been thoroughly studied as a potential treatment for FGIDs. Tricyclic antidepressants (TCAs), selective serotonin reuptake inhibitors (SSRIs), and selective norepinephrine reuptake inhibitors (SNRIs) show the most promise in treating some of the symptoms of FGIDs. TCAs, specifically amitriptyline, show promising results when examining common FGIDs symptoms such as pain and poor quality of life.[34] SNRIs also demonstrate pain-relieving qualities.[30] SSRIs are less effective in pain management, but may reduce symptoms of anxiety and depression, which would, in turn, reduce some FGIDs symptoms.[1]

Epidemiology

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Functional gastrointestinal disorders are very common. Globally, irritable bowel syndrome and functional dyspepsia alone may affect 16–26% of the population.[1][35]

Research

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There is considerable research into the causes, diagnosis and treatments for FGIDs. Diet, microbiome, genetics, neuromuscular function and immunological response all interact.[1] A role for mast cell activation has been proposed as one of the factors.[36][37]

See also

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References

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  1. ^ a b c d e f g h i Drossman DA (2016). "Functional Gastrointestinal Disorders: History, Pathophysiology, Clinical Features and Rome IV". Gastroenterology. 150 (6): 1262–1279. doi:10.1053/j.gastro.2016.02.032. PMID 27144617.
  2. ^ a b c Drossman, D.A.; Chang, L. (2016). Rome IV Functional Gastrointestinal Disorders: Disorders of Gut-brain Interaction. vol. 1. Rome Foundation. p. 1–32. ISBN 978-0-9907915-2-2. Retrieved 2024-04-11.
  3. ^ "Rome Foundation // Scoring Rome III Questionnaire using SAS". 29 March 2022.
  4. ^ Drossman DA. The Rome IV Committees, editor. Functional Gastrointestinal Disorders and the Rome IV process. In: Drossman DA, Chang L, Chey WD, Kellow J, Tack J, Whitehead WE, editors. Rome IV functional gastrointestinal disorders: disorders of gut-brain interaction.I. Raleigh, NC: The Rome Foundation; 2016. pp 1–32.
  5. ^ Drossman DA. Biopsychosocial issues in gastroenterology. In: Feldman M, Friedman LS, and Brandt LJ ads. Sleisenger and Fordtran's gastrointestinal and liver disease. 10th ed. Philadelphia: Saunders Elsevier, 2015:349–362.
  6. ^ Mayer, Emeran A.; Savidge, Tor; Shulman, Robert J. (2014). "Brain–Gut Microbiome Interactions and Functional Bowel Disorders". Gastroenterology. 146 (6). Elsevier BV: 1500–1512. doi:10.1053/j.gastro.2014.02.037. ISSN 0016-5085. PMC 4114504. PMID 24583088.
  7. ^ Jones, M. P.; Dilley, J. B.; Drossman, D.; Crowell, M. D. (2006-01-17). "Brain–gut connections in functional GI disorders: anatomic and physiologic relationships". Neurogastroenterology & Motility. 18 (2). Wiley: 91–103. doi:10.1111/j.1365-2982.2005.00730.x. ISSN 1350-1925.
  8. ^ Drossman, Douglas A. (1998). "Gastrointestinal Illness and the Biopsychosocial Model". Psychosomatic Medicine. 60 (3). Ovid Technologies (Wolters Kluwer Health): 258–267. doi:10.1097/00006842-199805000-00007. ISSN 0033-3174. PMID 9625212.
  9. ^ Saito, Yuri A.; Talley, Nicholas J. (2008). "Genetics of Irritable Bowel Syndrome". The American Journal of Gastroenterology. 103 (8). Ovid Technologies (Wolters Kluwer Health): 2100–2104. doi:10.1111/j.1572-0241.2008.02048.x. ISSN 0002-9270. PMC 3935287. PMID 18684190.
  10. ^ Tran, L.; Chaloner, A.; Sawalha, A.H.; Greenwood Van-Meerveld, B. (2013). "Importance of epigenetic mechanisms in visceral pain induced by chronic water avoidance stress". Psychoneuroendocrinology. 38 (6). Elsevier BV: 898–906. doi:10.1016/j.psyneuen.2012.09.016. ISSN 0306-4530. PMID 23084728.
  11. ^ Zborowski, Mark (1952). "Cultural Components in Responses to Pain 1". Journal of Social Issues. 8 (4): 16–30. doi:10.1111/j.1540-4560.1952.tb01860.x. ISSN 0022-4537.
  12. ^ Cremon, Cesare; Stanghellini, Vincenzo; Pallotti, Francesca; Fogacci, Elisa; Bellacosa, Lara; Morselli-Labate, Antonio M.; Paccapelo, Alexandro; Di Nardo, Giovanni; Cogliandro, Rosanna F.; De Giorgio, Roberto; Corinaldesi, Roberto; Barbara, Giovanni (2014). "Salmonella Gastroenteritis During Childhood Is a Risk Factor for Irritable Bowel Syndrome in Adulthood". Gastroenterology. 147 (1). Elsevier BV: 69–77. doi:10.1053/j.gastro.2014.03.013. ISSN 0016-5085. PMID 24657623.
  13. ^ Collins SM, Chang C, Mearin F. Postinfectious chronic gut dysfunction: from bench to bedside. Am J Gastroenterol Suppl 2012;1:2–8
  14. ^ Shapiro, Michael A.; Nguyen, Mathew L. (June 2010). "Psychosocial stress and abdominal pain in adolescents". Mental Health in Family Medicine. 7 (2): 65–69. ISSN 1756-8358. PMC 2939458. PMID 22477924.
  15. ^ Williams, Amy E.; Czyzewski, Danita I.; Self, Mariella M.; Shulman, Robert J. (April 2015). "Are child anxiety and somatization associated with pain in pain-related functional gastrointestinal disorders?". Journal of Health Psychology. 20 (4): 369–379. doi:10.1177/1359105313502564. ISSN 1359-1053. PMC 4418969. PMID 24155191.
  16. ^ a b Janicke, D. (1999-04-01). "Empirically supported treatments in pediatric psychology: recurrent abdominal pain". Journal of Pediatric Psychology. 24 (2): 115–127. doi:10.1093/jpepsy/24.2.115. PMID 10361390.
  17. ^ Cunningham, Natoshia R.; Lynch-Jordan, Anne; Mezoff, Adam G.; Farrell, Michael K.; Cohen, Mitchell B.; Kashikar-Zuck, Susmita (May 2013). "Importance of Addressing Anxiety in Youth With Functional Abdominal Pain: Suggested Guidelines for Physicians". Journal of Pediatric Gastroenterology & Nutrition. 56 (5): 469–474. doi:10.1097/MPG.0b013e31828b3681. ISSN 0277-2116. PMC 4476243. PMID 23412539 – via PubMed.
  18. ^ a b c Basch, Molly C.; Chow, Erika T.; Logan, Deirdre E.; Schechter, Neil L.; Simons, Laura E. (2015). "Perspectives on the clinical significance of functional pain syndromes in children". Journal of Pain Research. 8: 675–686. doi:10.2147/JPR.S55586. ISSN 1178-7090. PMC 4605245. PMID 26504406.
  19. ^ Garr, Katlyn; Odar Stough, Cathleen; Origlio, Julianne (2021-06-03). "Family Functioning in Pediatric Functional Gastrointestinal Disorders: A Systematic Review". Journal of Pediatric Psychology. 46 (5): 485–500. doi:10.1093/jpepsy/jsab007. ISSN 0146-8693. PMID 33876231.
  20. ^ Camilleri, Michael (2012-10-25). "Peripheral Mechanisms in Irritable Bowel Syndrome". New England Journal of Medicine. 367 (17): 1626–1635. doi:10.1056/NEJMra1207068. ISSN 0028-4793. PMID 23094724.
  21. ^ Delgado-Aros, Silvia; Camilleri, Michael (2005). "Visceral Hypersensitivity". Journal of Clinical Gastroenterology. 39 (5). Ovid Technologies (Wolters Kluwer Health): S194–S203. doi:10.1097/01.mcg.0000156114.22598.1b. ISSN 0192-0790. PMID 15798485.
  22. ^ Mayer, Emeran A.; Gebhart, G.F. (1994). "Basic and clinical aspects of visceral hyperalgesia". Gastroenterology. 107 (1). Elsevier BV: 271–293. doi:10.1016/0016-5085(94)90086-8. ISSN 0016-5085. PMID 8020671.
  23. ^ Zhou, QiQi; Zhang, Buyi; Verne, Nicholas G. (2009). "Intestinal membrane permeability and hypersensitivity in the irritable bowel syndrome". Pain. 146 (1). Ovid Technologies (Wolters Kluwer Health): 41–46. doi:10.1016/j.pain.2009.06.017. ISSN 0304-3959. PMC 2763174. PMID 19595511.
  24. ^ Camilleri, M.; Madsen, K.; Spiller, R.; Van Meerveld, B. G.; Verne, G. N. (2012-05-14). "Intestinal barrier function in health and gastrointestinal disease". Neurogastroenterology & Motility. 24 (6). Wiley: 503–512. doi:10.1111/j.1365-2982.2012.01921.x. ISSN 1350-1925. PMC 5595063. PMID 22583600.
  25. ^ Mayer, Emeran A.; Savidge, Tor; Shulman, Robert J. (2014). "Brain–Gut Microbiome Interactions and Functional Bowel Disorders". Gastroenterology. 146 (6). Elsevier BV: 1500–1512. doi:10.1053/j.gastro.2014.02.037. ISSN 0016-5085. PMC 4114504. PMID 24583088.
  26. ^ Simrén, Magnus; Barbara, Giovanni; Flint, Harry J; Spiegel, Brennan M R; Spiller, Robin C; Vanner, Stephen; Verdu, Elena F; Whorwell, Peter J; Zoetendal, Erwin G (2012-06-22). "Intestinal microbiota in functional bowel disorders: a Rome foundation report". Gut. 62 (1). BMJ: 159–176. doi:10.1136/gutjnl-2012-302167. hdl:2164/5900. ISSN 0017-5749. PMC 3551212. PMID 22730468.
  27. ^ Chey, William D (2013). "The Role of Food in the Functional Gastrointestinal Disorders: Introduction to a Manuscript Series". American Journal of Gastroenterology. 108 (5). Ovid Technologies (Wolters Kluwer Health): 694–697. doi:10.1038/ajg.2013.62. ISSN 0002-9270. PMID 23545712.
  28. ^ Rajilić-Stojanović, Mirjana; Jonkers, Daisy M; Salonen, Anne; Hanevik, Kurt; Raes, Jeroen; Jalanka, Jonna; de Vos, Willem M; Manichanh, Chaysavanh; Golic, Natasa; Enck, Paul; Philippou, Elena; Iraqi, Fuad A; Clarke, Gerard; Spiller, Robin C; Penders, John (2015). "Intestinal Microbiota And Diet in IBS: Causes, Consequences, or Epiphenomena?". American Journal of Gastroenterology. 110 (2). Ovid Technologies (Wolters Kluwer Health): 278–287. doi:10.1038/ajg.2014.427. hdl:1956/11842. ISSN 0002-9270. PMC 4317767. PMID 25623659.
  29. ^ a b Appleton, Jeremy (August 2018). "The Gut-Brain Axis: Influence of Microbiota on Mood and Mental Health". Integrative Medicine (Encinitas, Calif.). 17 (4): 28–32. ISSN 1546-993X. PMC 6469458. PMID 31043907.
  30. ^ a b c Whitfield, K. Lynette; Shulman, Robert J. (May 2009). "Treatment Options for Functional Gastrointestinal DisordersFrom Empiric to Complementary Approaches". Pediatric Annals. 38 (5): 288–294. doi:10.3928/00904481-20090501-11. ISSN 0090-4481. S2CID 42196894 – via SLACK Journals.
  31. ^ Dear, B.F.; Fogliati, V.J.; Fogliati, R.; Gandy, M.; McDonald, S.; Talley, N.; Holtmann, G.; Titov, N.; Jones, M. (May 2018). "Transdiagnostic internet-delivered cognitive-behaviour therapy (CBT) for adults with functional gastrointestinal disorders (FGID): A feasibility open trial". Journal of Psychosomatic Research. 108: 61–69. doi:10.1016/j.jpsychores.2018.02.015. PMID 29602327 – via Elsevier Science Direct.
  32. ^ Chiarioni, Giuseppe; Pesce, Marcella; Fantin, Alberto; Sarnelli, Giovanni (February 2018). "Complementary and alternative treatment in functional dyspepsia". United European Gastroenterology Journal. 6 (1): 5–12. doi:10.1177/2050640617724061. ISSN 2050-6406. PMC 5802680. PMID 29435308.
  33. ^ McKenna, Kristine; Gallagher, Katherine A.S.; Forbes, Peter W.; Ibeziako, Patricia (July 2015). "Ready, Set, Relax: Biofeedback-Assisted Relaxation Training (BART) in a Pediatric Psychiatry Consultation Service". Psychosomatics. 56 (4): 381–389. doi:10.1016/j.psym.2014.06.003. PMID 25556570 – via Elsevier Science Direct.
  34. ^ Korterink, Judith J.; Rutten, Juliette M.T.M.; Venmans, Leonie; Benninga, Marc A.; Tabbers, Merit M. (February 2015). "Pharmacologic Treatment in Pediatric Functional Abdominal Pain Disorders: A Systematic Review". The Journal of Pediatrics. 166 (2): 424–431.e6. doi:10.1016/j.jpeds.2014.09.067. PMID 25449223 – via Elsevier Science Direct.
  35. ^ Sperber AD, Drossman DA, Quigley EM (2012). "The global perspective on irritable bowel syndrome: a Rome Foundation-World Gastroenterology Organisation symposium". Am. J. Gastroenterol. 107 (11): 1602–9. doi:10.1038/ajg.2012.106. PMID 23160283. S2CID 34208367.
  36. ^ Wouters MM, Vicario M, Santos J (2015). "The role of mast cells in functional GI disorders". Gut. 65 (1): 155–168. doi:10.1136/gutjnl-2015-309151. PMID 26194403. It is well established that mast cell activation can generate epithelial and neuro-muscular dysfunction and promote visceral hypersensitivity and altered motility patterns in FGIDs, postoperative ileus, food allergy and inflammatory bowel disease.
  37. ^ Bashashati, M; Moossavi, S; Cremon, C; Barbaro, MR; Moraveji, S; Talmon, G; Rezaei, N; Hughes, PA; Bian, ZX; Choi, CH; Lee, OY; Coëffier, M; Chang, L; Ohman, L; Schmulson, MJ; McCallum, RW; Simren, M; Sharkey, KA; Barbara, G (January 2018). "Colonic immune cells in irritable bowel syndrome: A systematic review and meta-analysis". Neurogastroenterology & Motility. 30 (1): e13192. doi:10.1111/nmo.13192. PMID 28851005. S2CID 33807711. Mast cells and CD3+ T cells are increased in colonic biopsies of patients with IBS vs non-inflamed controls
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