Intestinal Wall Remodeling (Infliximab Therapy) in Crohn's Disease Patients Undergoing Serial Computed Tomography (CT) Enterography

Study Overview
=================
Brief Summary
-----------------
Anti-TNF therapy induces intestinal wall remodeling that correlates with clinical response and can be detected in patients undergoing serial computed tomography enterography (CTE).

Detailed Description
-----------------
We will retrospectively identify Crohn's disease patients who underwent serial CTE imaging between 2004 and 2008. Approximately 4500 CTEs were performed over this period. We estimate a sample size of 50 Crohn's disease patients who have had CTE performed before and after infliximab therapy was initiated. We will analyze each CTE for the presence of penetrating disease, number of inflammatory lesion, length of each lesion, and severity of each lesion (degree of enhancement, wall thickness, stratification, vascular engorgement, fatty proliferation, and symmetry). Degree of enhancement and thickness will be graded on a 5-point scale. Stratification, vascular engorgement, fatty proliferation, and symmetry will be treated as dichotomous variables (yes/no). Only small bowel lesions will be described. A GI radiologist (JGF), blinded to the clinical information and previous imaging results, will provide the readings. Comparisons between CTEs will be performed to determine responders (all lesions improved), mixed responders (not all lesions improved), and refractory (no lesion improved). A descriptive pattern of healing will also be recorded for each lesion. Clinical data to be recorded include indication for CTE, time between CTE, dates of each CTE, date on first infliximab infusion, dose of infliximab, interval between infusions, history of penetrating disease, history of surgery, clinical status at imaging (remission, flare, or uncertain), medication usage, age, and disease duration. Clinical status at time of imaging will be based on the ordering clinician's global assessment at the time of repeat CTE. This will be determined by a review of the medical record by a gastroenterologist (DHB).

Official Title
-----------------
Intestinal Wall Remodeling After Initiation of Infliximab Therapy in Crohn's Disease Patients Undergoing Serial CT Enterography

Conditions
-----------------
Crohn's Disease

Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion criteria Established Crohn's disease CTE before and after initiating infliximab Underwent at least 2 CTEs between 1/1/2004 and 12/31/2007 At least 6 months between CTEs *off-label use of infliximab by either increased dose or shortened interval will be included in the study Exclusion criteria Small bowel surgery occurring before repeat CTE imaging Episodic infliximab therapy (intervals greater than every 8 weeks)

Ages Eligible for Study
-----------------
Minimum Age: 18 Years
Maximum Age: 80 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Crohns patients<br>Established Crohn's disease patients who underwent CTE imaging before and after initiating infliximab therapy | |

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Anti-TNF therapy induces intestinal wall remodeling that correlates with clinical response and can be detected in patients undergoing serial computed tomography enterography (CTE). |  | 2004-2008 |