Clinical Trial Details
— Status: Terminated
Administrative data
| NCT number |
NCT02347280 |
| Other study ID # |
McGill-A08-M59-14B |
| Secondary ID |
|
| Status |
Terminated |
| Phase |
N/A
|
| First received |
|
| Last updated |
|
| Start date |
January 2015 |
| Est. completion date |
November 30, 2019 |
Study information
| Verified date |
December 2019 |
| Source |
Jewish General Hospital |
| Contact |
n/a |
| Is FDA regulated |
No |
| Health authority |
|
| Study type |
Interventional
|
Clinical Trial Summary
LAY SUMMARY
Clostridium Difficile (C.difficile) is a bacterial infection that can cause an inflammation
of the colon, (C.difficile colitis). This sometimes progresses to a sudden and severe
illness. The present treatment for fulminant colitis is a total abdominal colectomy with end
ileostomy. This means, a surgery is performed which removes the entire diseased colon. The
end of the small intestine is then brought out to the front of the abdomen as a stoma, and
the patient wears a bag. Despite this invasive treatment, there remains a significant rate of
death (38-50%). In addition, patients have a long recovery after this long operation and many
(67%) will not be fit for a second big operation to remove the stoma (that is to reconnect
the intestine).
The purpose of our study is to determine if a loop ileostomy with colonic lavage will result
in better outcomes. A loop ileostomy is when a loop of small intestine is brought out to the
abdomen and the colon remains in the abdomen. The diseased colon, which is preserved, is
washed with a warm solution (like the solution used in a colonoscopy preparation) and then
treated with an antibiotic via this ileostomy. So far, one study has been done using a loop
ileostomy with colonic lavage. 42 patients who underwent this treatment were compared to 42
patients that underwent the standard of care (complete removal of the colon with end
ileostomy). The 42 patients who underwent a loop ileostomy showed a significant decrease in
rate of death compared to the standard of care. Also, in the study, patients who underwent a
loop ileostomy had a much higher rate of reconnection of the intestine (closing the stoma).
The purpose of this study is to see if a loop ileostomy with colonic lavage can treat
patients with fulminant colitis with less risk of death than the standard of care.
Once the patient is diagnosed with fulminant colitis and meets the eligibility criteria,
he/she will be asked by the surgeon on-call if they would like to participate in this
research study. If they agree to be in this study, they must first sign a consent form. They
may be asked by the surgeon to enroll in either the investigational arm (loop ileostomy) or
the standard of care arm. After surgery, all patients will receive the same standard routine
care. During the hospital stay, information will be taken from their chart for purposes of
the study. Routine follow up visits with their surgeon will be at 2, 3, 6, and 12 months
after surgery. If the patient decides to be in the study, the patient will be expected to
complete all the follow up study visits. The patient will not be required to do anything
extra or have any extra tests if they decide to be in the study at any of these visits.
Description:
PROTOCOL
1. Study purpose and rationale
i. Specific Aim and Hypothesis: The objective of this study is to determine if loop
ileostomy and colonic irrigation reduces 30 day all-cause mortality compared to the
current standard of care for fulminant Clostridium difficile colitis (FCDC), total
abdominal colectomy with end ileostomy. We hypothesize that loop ileostomy and colonic
irrigation (ileostomy) will significantly reduce 30 day all-cause mortality compared to
total abdominal colectomy with end ileostomy (TAC). Furthermore, we hypothesize that
this intervention will reduce 30-day morbidity, 90 day all-cause mortality and improve
gastrointestinal restoration rates compared to TAC.
ii. Significance: With the emergence of a hypervirulent toxin-producing NAP1/027 strain
of C. difficile in 2003, C.difficile colitis has become an increasingly common problem
(1). Up to 10% of patients with C.difficile infection progress to FCDC with a mortality
of 36-80% (1-3). The standard of care for FCDC is a timely TAC; however despite this
intervention mortality rates remain high (38-55%) (2,3). The standard of care for FCDC
is a TAC. This includes end ileostomy, which becomes permanent in over 65% of patients
as reversal necessitates an extensive operation (5). Neal et al. proposed a new surgical
approach for FCDC which includes creation of a loop ileostomy, intraoperative colonic
lavage with warmed polyethylene glycol via the ileostomy and postoperative antegrade
instillation of vancomycin flushes into the diseased colon via the ileostomy. In a
single-institution series, this alternative approach for 42 patients was compared to 42
historical controls that underwent TAC (4). While demographics and severity of illness
in the control and intervention groups were comparable, the 30 day mortality was
significantly decreased in ileostomy compared to TAC groups (19% vs. 50%). To date, this
is the only report of this new alternative procedure for FCDC. Neal et al.'s work is a
single center, single surgeon series of loop ileostomy cases compared to a historical
series of patients treated with TAC. To further investigate their promising results and
innovative treatment, we propose a multi-center national (Canadian) prospective cohort
study for the evaluation of this intervention compared to controls.
2. Description of study population
i. Basic study design: This is a national, multi-center prospective cohort study to
evaluate loop ileostomy and colonic lavage to the standard of care, total abdominal
colectomy with end ileostomy. This study will consist of a prospective registry (from
2014 to 2017) with 2 prospective arms: the loop ileostomy group and the control (TAC)
group. In addition, we will concurrently perform a retrospective chart review at all
participating sites from (from 2010 to 2014) to serve as a third group of historical
controls.
Study population and assembly of patients: Subjects will be drawn from 20 participating
adult, tertiary Canadian hospitals. All patients with Clostridium difficile infection
who are being evaluated for surgery are eligible for this study. Subject identification
will be carried out by the attending surgeon on call, eligibility will be evaluated, and
patients will be approached for study participation. Consent for the study will be
obtained from the subject or a legally authorized representative (the legal
representative must be a court-appointment mandatory, curator or tutor). Vulnerable
patients with pre-existing incapacity to consent and who do not have a legally
authorized representative will be excluded. In contrast, some subjects may have a late
presentation of FCDC and therefore may lack the physical and mental capacity to provide
an independent informed consent. At this time, the consent for the study will be
obtained by the next of kin (next of kin will be defined as in Civil Code of Québec).
When and if the subject recovers, consent will be obtained by him/her at that time.
Enrolment into the trial will be in accordance with the Civil Code of Québec (articles
15, 20, 21) (6) QC notation.
As this disease process and surgery only occur on an emergency basis, the surgeon
on-call (pre-determined by each hospital's call schedule) will assess the patient and
he/she will invite the patient to enrol in the study. The decision to undergo loop
ileostomy or TAC will be left up to the discretion of the surgeon and the patient. In
either case, the patient will be will be given the option to enrol in the study either
in the investigational arm (loop ileostomy) or the control arm (TAC). We will
concurrently perform a retrospective chart review at all participating sites from
01/2010 to 01/2014 to serve as a historical comparative control group (180 patients
estimated). These patients will be identified from hospital databases by discharge and
procedure codes. Chart review will be conducted using the same inclusion and exclusion
criterias used for the prospective patients. The stable nature and incidence of
C.difficile infection in Canada since 2009 and the well-established standard surgical
approach (TAC) for FCDC (6) justify the comparison to a historical control.
3. Sample size and how it was determined
We estimate that 60 colectomies for FCDC will be performed per year (at 20 institutions)
(5). Neal et al. report an absolute risk reduction of 31% in 30 day mortality. However,
given that this was a single surgeon experience and that our current 30-day mortality is
38% (5) (in contrast to 50% for TAC in Neal et al.'s series), we anticipate an absolute
risk reduction of 22%. For this reduction, with a type I error rate of 0.05, a power of
80%, a 1:1 control to intervention ratio, 63 patients are required in each arm, and are
estimated to be accrued over 2 years. We will also cluster by surgeon and institution,
however as each surgeon and institution are only expected to contribute very few
(approximately 1-3) cases, we are estimating a small intraclass correlation coefficient
and design effect close to 1.
4. Design and description of methodology
i. Exposures and their measurement: The exposure is the treatment strategy. The
intervention being evaluated is loop ileostomy with intra-operative colonic lavage.
Ileostomy and colonic lavage is not considered standard of care at our institutions.
Patients managed with ileostomy and colonic lavage who do not respond as expected may be
converted to TAC, intra- or post-operatively, at the discretion of the surgeon. These
patients will be analyzed in the ileostomy group (similar to an intention to treat
analysis) since this was the original treatment strategy assigned. A subgroup analysis
of these patients who had to be converted to TAC, and their impact on the overall
results, will also be examined.
ii. Confounders and their measurement: Fortunately, FCDC is managed on an emergency
basis only; thus the surgeon on-call (based on the on-call schedule) is the one who will
care for the patient and the patient does not choose their surgeon, nor is the surgeon
choosing their patient. This eliminates any referral bias, that is, surgeon assignment
can be considered random and there is no bias for different surgeons to be treating
different types of patients. All general and colorectal surgeons are equally qualified
to make the clinical decision to operate for FCDC (inclusion criteria for the study) and
to perform the both proposed operations, TAC and loop ileostomy. However, individual
surgeon bias may exist towards one procedure. This will be examined by a short
qualitative questionnaire requesting the rationale for the choice of operation. Due to
the infrequency of the operation for FCDC and the need to recruit multiple participating
surgeons, each surgeon may only contribute 1-3 patients. Variability in individual and
institution clinical practice will be accounted for by clustering by surgeon and
institution in the analysis. Institution and surgeon variability may introduce may
reflect differences in technical skill, hospital infrastructure, degree of adoption of
early surgical consultation for FCDC, and operating room availability. Due to the
severity of FCDC requiring surgery and the critically ill nature that patients reach
prior to surgical consultation, the patient population entered into the trial will be
relatively homogenous. This remarkable homogeneity within the patient population
presenting for surgical management of FCDC was observed in our hospitals (2,5) and in
Neal et al.'s study (4). Nonetheless, we will anticipate and account for confounding
patient factors in the analysis including older age, immunosuppression, elevated pre-op
white blood cell count, lactate, intubation and vasopressors (2,3,5). Earlier time to
surgery is associated with improved survival and may also be a confounder as surgeons
may be more inclined to offer loop ileostomy and lavage earlier than they would offer
TAC given its minimally invasive nature. Similarly due to the new intervention's less
invasive nature, older patients with co-morbidities may be more inclined to consent to
surgery than they would be if offered TAC; introducing confounding by indication.
5. Definition of end-points
The primary outcome is 30 day all-cause mortality. This binary outcome is the most
suitable and reported outcome for FCDC. The secondary outcomes are: 1) 30 day morbidity,
a composite binary outcome to include all Clavien-Dindo grade 2-5 (serious)
complications (6) which also includes death (Clavien grade 5); 2) 90 day all-cause
mortality (binary) in order to capture those who survive the first month but have a long
and complicated hospitalization with poor outcome; 3) restoration of gastrointestinal
continuity by ileostomy closure (binary) which serves as a surrogate for excellent
recovery; 4) length of hospital stay, a censored outcome, using time to discharge as the
outcome censoring by death (patients who die during hospitalization will contribute
towards length of stay for the days that they survived).
6. Measurements and study instruments (including questionnaires, data collection forms,
etc)
Prospective data collection will be performed during the hospitalization daily for 30
days, and then patients will be followed at 3, 6 and 12 months post-operatively with a
phone follow-up . If these time points coincide with a visit to the surgeon's office,
the data can be collected at that time. The patient will not be required to do any extra
tests or hospital visits if they participate in the study
7. Data analysis plan
The distribution of each measured variable will be assessed graphically and with
diagnostics. Descriptive variables and confounders will be compared between ileostomy
and TAC groups using two sample t-tests, Wilcoxon rank sum, and fisher exact tests for
normal, right-skewed and categorical variables, respectively. A logistic regression
model predicting exposure (TAC vs. ileostomy) will be created with potential confounders
outlined above (surgeon and patient factors) and a propensity score will be created for
each individual. A logistic regression model will then be fit for the main outcome, with
the main predictor being intervention, and the propensity score included as a second
co-variate to control for confounding. Alternatively, we may choose to match on the
propensity score. The impact of ileostomy on mortality will be expressed as an odds
ratio (95% CI). Secondary analyses (considered exploratory) will compare 30 day
morbidity, 90 day all-cause mortality, length of hospital stay and rate of GI
restoration for ileostomy and TAC. A subgroup analysis will be performed for ileostomy
patients who were converted to TAC. The historical control arm will be analyzed
separately and should they be similar to both groups will be compared to them.
8. Recruitment procedures including copies of advertisements;
Subject identification will be carried out by the attending surgeon on call, eligibility will
be evaluated, and patients will be approached for study participation. A consent for the
study will be obtained from the subject or a legally authorized representative. As this
disease process and surgery only occur on an emergency basis, the surgeon on-call
(pre-determined by each hospital's call schedule) will assess the patient and he/she will
invite the patient to enrol in the study. The decision to undergo loop ileostomy or TAC will
be left up to the discretion of the surgeon and the patient. In either case, the patient will
be will be given the option to enrol in the study either in the investigational arm (loop
ileostomy) or the control arm (TAC). The patient will be given a consent form as soon as they
are identified as a potential candidate by the surgeon-on-call. Once the patient and/or the
legal representative have signed the consent form, the patient will be considered accrued to
the study.
Details on confidentiality
Patient data will be linked to a hospital ID number and a study ID number. Once the patient
has completed the follow-up period, their hospital ID number will be removed such that they
are de-identified.
The data will be maintained in a secure web-based registry (Redcap). This will be used only
by the research team and will always be accessed from a password protected hospital computer.
The data will be kept in a de-identified manner for 5 years following study completion.
The study will be conducted according to ethical principles stated in the Declaration of
Helsinki (2013), ethics approval will be obtained before initiating study. Also, consent
forms will take into consideration the well-being, free-will and respect of the participants,
including respect of privacy.
