Faramarz Darakhshan, Elham Vali Khojeini, Hedieh Balaii, Nosratollah
Naderi, Farzad Firouzi, Alma Farnood, Manijeh Habibi, Hamid Mohaghegh
Shalmani, Rahim Aghazadeh, Homayoun Zojaji, Nasser Ebrahimi Daryani,
Amir Houshang Mohammad Alizadeh, Mohammad Reza Zali
Department of Inflammatory Bowel Disease,
ABSTRACT
Aim: To gain
recent characteristic information about inflammatory bowel disease (IBD)
in
Background:
Inflammatory bowel disease (IBD) was believed to be infrequent in
Patients and Method: Between 1992 and 2007, a total of 803 IBD patients (671 ulcerative
colitis (UC), 109 Crohn's disease (CD) and 23 indeterminate colitis
(IC)) referred to our research centre. We evaluated the demographic
data, extraintestinal manifestations, chief complaints and extension of
disease in this group of patients.
Results: The
mean age at diagnosis was 33.01, 33.18, and 34.52 years in UC, CD, and
IC patients, respectively. The male to female ratio was 0.78 for UC
patients while it was 1.18 in CD patients. Patients with UC chiefly
presented by hematochezia (54.24%), whereas those with CD and IC
complained of abdominal pain (55.96% and 47.82%, respectively). Totally,
67.51% UC patients, 70.64% CD patients and 73.90% IC patients reported
extra intestinal manifestations. The most involved section was left
colon in UC (90.49%) and colon in CD patients (75%).
Conclusion: The
demographic and clinical picture of IBD is more or less the same as
other developing countries; however, the rarity of CD in
Keywords: Ulcerative colitis, Crohn's disease,
(Gastroenterology and Hepatology from bed to bench2008;1(1):19-24).
INTRODUCTION
The
chronic inflammatory bowel diseases (IBD) include two distinct entities,
ulcerative colitis (UC) and Crohn’s disease (CD), although there is a small
group of patients with an intermediate form. UC is an inflammatory process
confined to the colon in all instances, which presents itself clinically
with bloody diarrhea, mucus in the stools, abdominal pain, and weight loss.
CD can affect any part of the digestive tract from the mouth to the anus.
The terminal ileum is the commonest site for the disease. CD is clinically
presented with abdominal pain, diarrhea and weight loss, however, it
occasionally presents with an abdominal mass, intestinal obstruction, or
fistula (1). About 10% of the patients with colonic inflammation can not be
classified as either CD or UC. These patients are categorized as
“indeterminate colitis” (2,3).
Etiology of ulcerative colitis and Crohn’s disease are
still unknown. Knowledge of differing incidence rates of IBD in different
geographic areas or among races may provide insights into possible etiologic
factors. Similarly, temporal trends in the incidence rates in a given area
can provide valuable clues towards etiology. Epidemiological studies from
Western countries have reported that the incidence rates of IBD are higher
in the northern part of the world and among whites than in nonwhite
populations (4). The epidemiological data of the IBD prevalence in Europe
are provided by the
Unfortunately, there have been only few studies on IBD
in
We aimed to define the demographic features and
clinical characteristics in a relatively large group of patients with IBD
who had referred to our department during a 15-year period. These data may
provide insight into the possible causes of IBD and in part could explain
the differences between the IBD profile in
PATIENTS and METHODS
We used the database of Inflammatory Bowel Disease
patients in the research center for Gastroenterology and Liver Diseases of
Shahid Beheshti University of Medical Sciences,
Data were gathered during a 15-year period (1992-2007)
from the patients referring to Taleghani hospital (IBD research center) and
5 private clinics in
The patients were interviewed face to face by trained
general practitioners. Whenever patients referred back, their disease data
was updated by another interview. If the patient was illiterate and could
not give exact answers to our questions, we referred to his medical records.
Having completed the questionnaire, these data were entered to the IBD
database.
Ethical Consideration:
RESULTS
Totally, 803 patients were registered in our database,
671 UC, 109 CD and 23 IC patients. The mean age at diagnosis was 33.01 (a
range, 3-80 years) in UC, 33.18 (a range, 7-73 years) in CD, and 34.52 years
(a range, 17-70 years) in IC patients. In all IBD subgroups, most of the
patients aged 20-29 years. In figure 1 the age-specific frequency rates by
The male to female ratio in UC patients was 0.78, where
women were predominant; in contrary, male to female ratio in CD patients was
1.18. We also had one transsexual patient suffering from ulcerative colitis.
Figure 1.
Age distribution of Iranian patients with inflammatory bowel disease
Totally, 139 (20.71%) UC patients had a positive family history; of whom 91 (13.56%) were first- and 48 (7.15%) were second-degree relatives. The rate of positive family history in CD patients was almost similar to UC patients, affecting 13 (11.92%) first- and 7 (6.42%) second-degree relatives.
Table 1.
Predominant chief complaints of patients with ulcerative colitis
(UC), Crohn’s disease (CD), and indeterminate colitis (IC)
|
UC |
CD |
IC |
Diarrhea |
54.24* |
48.62 |
34.78 |
Hematochezia |
48.88 |
22.01 |
34.78 |
Bloody
Diarrhea |
45.00 |
22.93 |
30.43 |
Tenesmus |
43.07 |
41.28 |
26.08 |
Abdominal pain |
40.53 |
55.96 |
47.82 |
Weight
loss |
33.38 |
44.03 |
26.08 |
Weakness |
46.79 |
41.28 |
47.82 |
Anorexia |
24.44 |
33.94 |
30.43 |
Constipation |
17.43 |
14.67 |
30.43 |
*Given as percentages of the number of
patients in the different disease groups.
As presented in table 1, the major chief complaints of
UC patients were diarrhea (54.24%), hematochezia (48.88%), weakness
(46.79%) and bloody diarrhea
(45.00%). On the other hand, the predominant chief complaints of CD
patients were abdominal pain (55.96%), diarrhea (48.62%), weight loss
(44.03%) and weakness (41.28%). IC patients complained more commonly of
abdominal pain (47.82%), weakness (47.82%), diarrhea (34.78%),
hematochezia (34.78%), anorexia (30.43%), bloody diarrhea (30.43%) and
constipation (30.43%).
Perianal diseases were detected in 26 (23.85%) patients
with Crohn's Disease: 13 (11.92%) fistula, 12 (11%) hemorrhoid, 2
(1.83%) anal abscess, 1 (0.91%) fissure, and 1 (0.91%) anal stenosis.
Totally, 21 (3.12%) UC and 15 (13.76%) CD patients had
undergone colectomy.
Extra intestinal manifestations are shown in figure 2.
Totally, 67.51% of UC, 70.64% of CD and 73.9% of IC patients reported
extraintestinal manifestations. Muscoloskeletal manifestations were, by
far, the most common extraintestinal site of involvement. The frequency
of primary sclerosing cholangitis, pyoderma gangrenosum and erythema
nodosum in UC patients were 37 (5.51%), 11 (1.63%) and 20 (2.98%),
respectively. These
extraintestinal manifestations were also appeared in patients with
Crohn's disease: primary sclerosing cholangitis in 2 (1.83%), pyoderma
gangrenosum in 4 (3.66%) and erythema nodosum in 7 (6.42%) patients.
Primary sclerosing cholangitis and pyoderma gangrenosum did not appear
in IC patients, however, 2 (8.69%) had erythema nodosum.
Of 803 IBD patients,
the extension of disease was determined in 367 (45.07%) with total
colonoscopy and upper GI endoscopy. Of 305 UC patients, 2 (0.65%) had
sigmoiditis, 276 (90.49%) had left colon colitis, and 27 (8.85%)
presented with pancolitis. The extension of disease was determined in 48
(44.03%) CD patients: colon 36 (75%), ileum 7 (14.58%), ileum and colon
2 (4.16%) and upper GI tract 1 (2.08%). Extension of disease in 14
(60.86%) IC patients were as follow: 12 (85.71%) left colon, 1 (7.14%)
sigmoid and 1(7.14%) transverse colon.
Figure 2.
Frequency of extra-intestinal diseases in ulcerative colitis (UC),
Crohn’s disease (CD) and indeterminate colitis (IC) patients
DISCUSSION
There are a variety of reasons as to why it is
essential to pursue epidemiological studies in IBD. First, it is
important to quantify the magnitude of the problem. This helps health
planners understand the resources that are necessary to manage these
patients. Trends in the epidemiology, more importantly, can lead to
disease etiology clues.
The peak age of onset of UC and CD has varied among
different studies but appears to be broadly similar to the Western
experience. In a Japanese nationwide survey, the peak age of onset was
20–29 years for UC and 15–24 years for CD (8), whereas the median age of
diagnosis in a Korean study was 35 years (9). In the Leong et al. study
from Hong Kong and
In the Morita et al. survey in
We found a relatively high prevalence of a positive
family history of IBD, significantly more so in patients with UC than in
patients with CD (20.71% versus 18.34%).
Diarrhea was the most prevalent chief complaint of our
UC patients, a finding that is not only differed from our previous study
(13), but also disagreed Sang Hyoung Park et al. study on 304 Korean UC
patients and Russel et al. study in Netherland which explained rectal
bleeding as the most predominant chief complaint (14,15). On the other
hand, abdominal pain was the most prevalent chief complaint among CD
patients. This is in agreement with previous studies (13,15)
Results revealed that there are not significant
differences between the extent of disease in Asian and
Disease involvement in CD patients is predominantly
ileocolonic with approximately 30% of patients having colonic
involvement and 10–20% having only small intestinal involvement (17). In
our study, 75% of CD patients had colonic involvement.
Extra-intestinal manifestations have been reported in
2–34% of Asian UC patients (17). In our study, 67.51% of UC, 70.64% of
CD and 73.9% of IC patients reported extraintestinal manifestations.
This is, by far, greater than the reported 6.1% in Chinese UC patients
(18) and 6.2% in Bernstein et al. study; however, in the latter study,
those with peripheral arthritis have been deliberately excluded (19).
Our data are ,however, comparable to Indian population (34.7%), Korean
patients (24.1%), and other
Western studies (21-41%) (20-22). Early diagnosis, in addition to a
consistent therapy and regular check-ups, may lead to a significant
reduction in extra-intestinal diseases. Moreover, establishing the
associations of immunomediated diseases in extra-intestinal sites may
lead to a better understanding of the pathogenesis of IBD.
Perianal disease occurs in 2–30% of Asian patients, but
it is generally less common than Western population (17). In our study,
perianal diseases were detected in 26 (23.85%) CD patients.
REFERENCES
1.
Bing XIA,
Crusius JBA. Inflammatory bowel disease: definition, epidemiology,
etiologic aspects, and immunogenetic studies. World J Gastroenterol
1998;4(5):446-58.
2.
Price AB.
Overlap in the spectrum of non-specific inflammatory bowel disease:
‘colitis indeterminate’. J Clin Pathol 1978;31:567-77.
3.
Wells AD,
McMillan I,
4.
Whelan G.
Epidemiology of inflammatory bowel disease. Med Clin North Am
1990;74:1–12.
5.
Shivananda
S, Lennard-Jones J,
6.
Wiercinska-Drapalo A, Jaroszewicz J, Flisiak R, et al. Epidemiological
characteristics of inflammatory bowel disease in North-Eastern Poland.
World J Gastroenterol 2005;11(17):2630-33.
7.
Lennard-Jones
JE. Classification of inflammatory bowel disease. Scand J Gastroenterol
Suppl 1989;24:2–6.
8.
Morita N,
Toki S, Hirohashi T, et al. Incidence and prevalence of inflammatory
bowel disease in Japan: nationwide epidemiological survey during the
year 1991. J Gastroenterol 1995;30 (Suppl. 8):1–4.
9.
Yang SK,
Hong WS, Min YI, et al. Incidence and prevalence of ulcerative colitis
in the Songpa-Kangdong District, Seoul, Korea, 1986–1997. J
Gastroenterol Hepatol 2000;15:1037–42.
10.
Leong RW,
Lau JY, Sung JJ. The epidemiology and phenotype of Crohn’s disease in
the Chinese population. Inflamm Bowel Dis 2004;10:646–51.
11.
Jiang XL,
Cui HF. An analysis of 10218 ulcerative colitis cases in
12.
Abdul-Baki
H. Clinical epidemiology of inflammatory bowel disease in
13.
Aghazadeh
R, Zali MR, Bahari A, et al. Inflammatory bowel disease in
14.
Park SH.
Clinical features and natural history of ulcerative colitis in
15.
Russel MJ.
High incidence of inflammatory bowel disease in the
16.
Ling KL,
Ooi CJ, Luman W, et al. Clinical characteristics of ulcerative colitis
in Singapore, a multiracial city-state. J Clin Gastroenterol.
2002;35:144–8.
17.
Quyang Q.
Management consensus of inflammatory bowel disease for the Asia–Pacific
region. J Gastroenterol Hepatol 2006;21:1772–82.
18.
Bernstein
CN, Blanchard JF, Rawsthorne P, et al. The prevalence of extraintestinal
diseases in inflammatory bowel disease: A population-based study. Am J
Gastroenterol 2001;96:1116–22.
19.
Kochhar R,
20.
Park SM,
Han DS,
21.
Monsen U,
Sorstad J, Hellers G, et al. Extracolonic diagnoses in ulcerative
colitis: An epidemiological study. Am J Gastroenterol 1990;85:711–16.
22.
Olsson R,
Danielsson A, Jarnerot G, et al. Prevalence of primary sclerosing
cholangitis in patients with ulcerative colitis. Gastroenterology
1991;100: 1319–23.
23.
Gyde SN,
Prior P, Allan RN, et al. Colorectal cancer in ulcerative colitis: A
cohort study of primary referrals from three centers. Gut
1988;29:206–17.
24.
Ekbom A,
Helmick C, Zack M, et al. Ulcerative colitis and colorectal cancer. A
population-based study. N Eng J Med 1990;323:1228–33.