Irritable
Bowel Syndrome (IBS) is a disorder of the gastro-intestinal tract. It is
thought to affect between 10-20% of people. It can be a long-term and chronic
condition affecting either the small or large intestine. Symptoms can include
abdominal pain and discomfort, constipation and/or diarrhea.
Many
patients will visit their doctor when they suffer gastro-intestinal complaints.
Doctors will consider the symptoms and testimony from the patient in order to
reach a diagnosis that may be positive or negative for IBS.
The
basis of IBS diagnosis is a full physical examination and review of the patient’s
medical history. Doctors have to consider the possibility of more serious
medical conditions such as inflammatory bowel disease or colonic cancer.
Therefore laboratory tests of blood and stool and endoscopic procedures may be
used to rule out these conditions.
The
correct treatment of IBS starts with the correct diagnosis, and the key
diagnostic tool for doctors is an accurate description of the symptoms the
patient is experiencing. In 1978 a researcher called Adrian Manning and
colleagues developed criteria for IBS symptoms. Using the “Manning Criteria”,
doctors were able to positively identify IBS cases, enabling them to start
appropriate IBS treatment.
In
1988 in Rome an international forum of gastro-enterologists further specified
the IBS criteria, and in 1999 the Manning Criteria were revised into what is
now called the Rome II criteria. This set of symptoms is still used to inform
the standard diagnosis of IBS.
In
the Rome II criteria the symptoms that would cumulatively support a diagnosis
of IBS are:
1.
Stool
frequency is abnormal – either constipation or diarrhea.
2.
The
stool is abnormal – perhaps lumpy or watery (a diagnostic aid called the
Bristol Stool Form scale is used to categorize the stool into one of seven
groups).
3.
Bowel
movements are uncomfortable – perhaps straining, urgency or a feeling that the
evacuation is incomplete.
4.
Mucus
may be discharged from the anus.
5.
A
feeling of bloating or abdominal distension.
Not all of these
symptoms are necessarily present in every case.
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