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Title
Speaker
Irritable Bowel Syndrome
Update
- Whats Changed?
Speaker: Reuben Wong
Gastroenterologist
Associate Professor (Adj-NUS)
Moderator: Dr Jarrod Lee
Gastroenterologist
OUR CLINICS
 Mount Elizabeth Novena Specialist Centre
 Mount Alvernia Medical Centre D
 Gleneagles Medical Centre
 Farrer Park Medical Centre
 Parkway East Medical Centre
 Mount Elizabeth Medical Centre
OUR SERVICES
General Endoscopy
Advanced Endoscopy (EUS, ERCP,
Capsule Endoscopy, Small Bowel
Entersocopy, Complex Polyp Removal,
Dilation and Stenting)
24hr pH Monitoring and High Resolution
Manometry
Hydrogen Breath Testing
Colon Transit Studies
Fibroscan Liver Assessment
Nutrition and Dietetics
Specialized Psychological Services
Scope
1. What is IBS?
2. Why do people get IBS?
3. Is there a cure for IBS?
4. What is new.
Ibs update gp_2020
IBS
Relief w
defecation
Change in
frequency or
stool
consistency
Associated with
straining/urgency.
mucus
What is IBS  According to Rome III
10% of the time
Ibs update gp_2020
IBS Subtyping
Subtyping
 IBS-C >25% BSS 1/2 & <25% 6/7
 IBS-D >25% BSS 6/7 & <25% 遜
 IBS-M >25% BSS 1/2 & 3/4
Clinical common-sense prevails!
Emphasis is on abnormal BMs
 Reduction in number of IBS-Us
My patients symptoms have
changed!
Is it really IBS?
RK Wong et al. Inability of the Rome III criteria to distinguish FC from IBS-C. AJG 2010; 105(10); 2228-34
Is there a test for IBS?
NO there isnt a single test
Diagnosis based on:
 Patients symptoms
 Sometimes tests to exclude other
conditions:
 Endoscopy
 Scans
 Blood tests
(only in patients with alarm symptoms)
Patient asks Are you sure?
Youve got IBS lets treat you!
B Spiegel et al. Is IBS a diagnosis of exclusion: physician survey. AJG 2010; 105:848-58
No need to perform a standardized battery of tests in
patients who meet the symptom based criteria for
IBS
Utility of Diagnostic Tests in IBS
BD Cash et al. Utility of dx tests in IBS: systemic review. AJG 2002; 97: 2812-9
IBS
Symptoms
Genetics
Gut
Infections
Stress
Diet
Gut
Sensitivity
Microbe
Balance
The multiple factors that result in
IBS symptoms
IBS
Symptoms
Genetics
Gut
Infections
Stress
Diet
Gut
Sensitivity
Microbe
Balance
Elsenbruch S. Brain, Behavior & Immunity
2011;25:386-94
The Role of the Brain-Gut Axis
The Evidence for Stress in IBS
AGA Technical Review IBS. Gastroenterology 2002
IBS
Symptoms
Genetics
Gut
Infections
Stress
Diet
Gut
Sensitivity
Microbe
Balance
The Role of Gut Bugs
Ibs update gp_2020
IBS
Symptoms
Genetics
Gut
Infections
Stress
Diet
Gut
Sensitivity
Microbe
Balance
Post-Infectious IBS
Contaminated
Food
Bacteria/Virus
Travels to
Gut
Vomitting
Diarrhea
Fever
Immune System
Kills bugs
Infection
Cleared
Inflammation
Persists
Tummy Pain
Altered Bowels
Post-Infectious
IBS
Why Does this Happen?
Tornblom H et al, Scand Journ Gastroenterol 2005
IBS
Symptoms
Genetics
Gut
Infections
Stress
Diet
Gut
Sensitivity
Microbe
Balance
Dietary Intervention
Ibs update gp_2020
Foods that cause symptoms
FODMAPs
 FructansF
 OligosaccharidesO
 DisaccharidesD
 MonosaccharidesM
 AndA
 PolyolsP
Evidence for FODMAPs
EP Halmos, P Gibson et al. Gastroenterology 2014
EP Halmos, P Gibson et al. Gastroenterology 2014
SatisfactionwithStool
IBS
Symptoms
Genetics
Gut
Infections
Stress
Diet
Gut
Sensitivity
Microbe
Balance
We are Singaporeans
We love our Spices!
Chili can cause pain and symptoms
TRPV - receptors
IBS
Symptoms
Genetics
Gut
Infections
Stress
Diet
Gut
Sensitivity
Microbe
Balance
The Role of Genes
 Study of 12,700 Norwegian Twins
 Concordance:
 22.4% in IDENTICAL twins
 9.1% in UNIDENTICAL twins
 Hereditability of 48.4% in WOMEN
Other Factors  Low Birth Weight
 Various genes have been identified
Bengston MB et al, Gut 2006
IBS
Symptoms
Genetics
Gut
Infections
Stress
Diet
Gut
Sensitivity
Microbe
Balance
Multiple Factors Interacting
Is IBS really that bad?
 Impairs quality of life
 Healthcare costs, days off work
Patient
Population
N Mean (SD)1 Median
(range)1
References
Irritable Bowel
Syndrome
146 22.08
(15.39)
17 (0, 69) R Wong et el.
Clinical Gastroenterol Hepatol
2013;11:151-5
Advanced Cancer 64 18.5 (11.0) 17 (0, 60) I Higginson et al.
Health and Quality Life Outcomes
2008:6:42
Dementia 152 32.9 (17.9) 30 (1, 82) J Ankri et al. Int Jour Geriatr Psych
2005;20:254-60
1 Zarit SH, Reever KE, Bach-Peterson J. Relatives of the Impaired Elderly: Correlates of Feelings of Burden.
Gerontologist.1980;20(6):649-55
2 Reuben K Wong, DA Drossman et al. Partner Burden in IBS. Clinical Gastroenterol Hepatol 2013;11:151-5
Burden and Disease Severity
16.28
21.36
27.72
0
5
10
15
20
25
30
Mild (<36) Moderate (36-110) Severe (>110)
ZBIScores(mean)
Reuben K Wong, DA Drossman et al. Partner Burden
in IBS. Clinical Gastroenterol Hepatol 2013;11:151-5
Is IBS treatable?
Its not hopeless!
The Efficacy of Treatment
Practical Treatment Approach
Anti-
spasmodics
AC Ford. IBS Treatment Sys Review. BMJ 2008
Elsenbruch S. Brain, Behavior & Immunity
2011;25:386-94
Psychological Intervention
Psychopharmacology
New treatment options
 Is there a role for dietary manipulation?
 New pharmacology
 Bugs & IBS
Ibs update gp_2020
Breath Testing
Ibs update gp_2020
Emerging Pharmacology
New Symptom-Specific Pharmacology
Constipation Predominant
GC receptor agonists
 Linaclotide
Bile acid modulators
 A3309
Dopamine Receptor
 Itopride
Serotonin Receptor Modulators
 Accelerates colonic transit
Cisapride
Zelmac
Prucalopride
 Efficacy in chronic constipation
Mosapride
New Symptom-Specific Pharmacology
Diarrhea Predominant
Chloride Secretion Inhibitor
 Crofelemer
Atypical Benzodiazepine
 Dextofisopam
Carbon Adsorbent
 AST 120
Tryptophan Hydoxylase Inhibitor
Opioid Receptor Agonist
Eulaxadoxine
CRF Antagonist
5-HT 3 Antagonists
Alosetron
Cilansetron
Ramosetron
IBS symptoms & the Microbiota
Ibs update gp_2020
Antibiotics Rifaximin
SB Meenes, W Chey AJG 2012
Ibs update gp_2020
IBS
Symptom
Relief
Organ
Transplant
Metabonomic
Effects
FMT  the holy grail of IBS Rx?
Complementary Alternative Medicine for IBS
Hope or Hogwash?
Acupuncture
Peppermint Oil
AC Ford. IBS Treatment Sys Review. BMJ 2008
The Therapeutic Scale
Putting it all together
IBS
Correct
Diagnosis
Brain-Gut
Medication
FODMAPs
Microbiota
Tailor Rx to
the patient &
severity

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Ibs update gp_2020