Small and Large bowel disorders Flashcards
What are the 2 major IBDs
Crohns and Ulcerative Colitis
What gene is linked to the develpment of Crohn’s disease
CARD15/NOD2 gene on chromosome 16
Where is there the greatest prevalence of IBD
Developed countries where there is improved sanitation
Smoking is protective in Ulcerative Colitits. True or False
True
Smoking is protective in Crohn’s disease. True or False
False
What is the incidence of Crohns in the developed world
7 in 100,000
What is the incidence of Ulcerative colitis in the developed world
12 in 100,000
What disease is increasing in prevalence
Crohn’s disease
What is the immune response in Crohn’s disease
Th1 driven
release of TNF alpha and interferon gamma
What is the immune response in Ulcerative colitis
Th2 driven
increased release of proinflammatroy cytokines including IL-5
Give characteristic features of Crohns which are absent in Ulcerative Colitis
Skip lesions (non-continuous fashion) Ileocaecal is the most common area to be affected Full thickness inflammation deep ulcers cobblestone appearance may cause fistula and abscess
Give characteristic features of UC which are absent in Crohn’s
Involves the rectum and extends in a confluent manner to involve the sigmoid colon and rectum
Only colonic mucosa is involved
Inflammation is confined to the mucosa
higher incidence of colorectal carcinoma
What is the histological hallmark of Crohn’s disease
Giant cell granuloma
What is the histological hallmark of UC
Acute and chronic inflammatory cells and abscesses
What are the common presentations of Crohn’s disease
Abdominal pain diarrhoea Weight loss malabsorption anorexia malaise
What is the common presentations of UC
Bloody diarrhoea
tenesmus
abdominal pain
How is the severity of UC determined
By the frequency, degree of blood loss in stools, pule and temperature
What are some complications of IBD
Toxic megacolon
Perforation
Cancer