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OPTimizing IMaging in APpendicitis.


- candidate number6825
- NTR NumberNTR2148
- ISRCTNISRCTN wordt niet meer aangevraagd.
- Date ISRCTN created
- date ISRCTN requested
- Date Registered NTR22-dec-2009
- Secondary IDsMEC 09/266 / 171001005 METC AMC / ZonMw
- Public TitleOPTimizing IMaging in APpendicitis.
- Scientific TitleThe accuracy of Magnetic Resonance Imaging in acute appendicitis.
- ACRONYMOPTIMAP
- hypothesisIn patient with clinically suspected appendicitis, imaging is needed to substantiate the clinical diagnosis. Imaging accuracy of US and CT is suboptimal, and the associated use of ionizing radiation and iodinated contrast medium are major drawbacks.

MRI is a potential replacement. Introducing MRI may reduce the negative appendectomy rate, the number of cases of missed appendicitis and obviate radiation exposure. Accuracy of MRI seems at least comparable to CT, but MRI has only been evaluated in limited series primarily evaluating selected patients. Given the high intrinsic contrast resolution of MRI, it may be even more accurate than CT for certain alternative conditions in patients with suspected appendicitis, such as gynaecological conditions. Our study will evaluate the accuracy, reproducibility and patient acceptance of MRI as compared to US and CT.
- Healt Condition(s) or Problem(s) studiedAppendicitis, MRI
- Inclusion criteriaEligible are adult patients, 18 years or older, with clinically suspected acute appendicitis presenting at the ED. No patients should be excluded based on the clinical condition: ‘clinically obvious’ cases should also be included (restriction see exclusion criteria).
- Exclusion criteriaExcluded are patients with conditions known to be incompatible with MRI use, such as a pacemaker, known claustrophobia, and critically ill patients that need intensive vital organ function monitoring for life-support.
- mec approval receivedyes
- multicenter trialyes
- randomisedno
- groupParallel
- TypeSingle arm
- Studytypeintervention
- planned startdate 1-feb-2010
- planned closingdate1-aug-2011
- Target number of participants230
- InterventionsConsenting patients will undergo standard practice, as defined in the draft Dutch guideline on the diagnostic work-up of patients with suspected appendicitis: initial US followed by CT in case of a non diagnostic US (i.e. US not confirming the diagnosis appendicitis). Additionally, all patients undergo MRI, with the MRI reader blinded from the results of the other imaging methods. As the reference standard we will use a final diagnosis assigned based on all available data after 3 months follow-up.
- Primary outcomeDiagnostic accuracy of MRI in detecting acute appendicitis will be calculated with corresponding 95% confidence intervals, by comparing the results of MRI with the final diagnosis assigned by the expert panel. We will determine the sensitivity, specificity, predictive values, inter-observer agreement and patient acceptance of MRI in a consecutive series of patients suspected for acute appendicitis.
- Secondary outcomeIn a scenario analysis imaging strategies with sequential use of US and CT or MRI will be compared, including a strategy in which CT after a non diagnostic US (i.e. an US examination not confirming the diagnosis acute appendicitis) is replaced by MRI, and MRI in all patients.
- TimepointsAll patients will have 3-month follow up. General practice physicians will be contacted to assure patients did not have an appendectomy in another hospital, or an alternative diagnosis was assigned. An expert panel consisting of two surgeons and a radiologist, will assign a final diagnosis after a follow-up period of 3 months, based on all available information: clinical information, imaging findings (except MRI findings), surgery, pathology and follow up.
- Trial web sitewww.optimap.nl
- statusstopped: trial finished
- CONTACT FOR PUBLIC QUERIESMD, PhD M.M.N. Leeuwenburgh
- CONTACT for SCIENTIFIC QUERIESProf. dr. J. Stoker
- Sponsor/Initiator Academic Medical Center (AMC), Amsterdam
- Funding
(Source(s) of Monetary or Material Support)
ZON-MW, The Netherlands Organization for Health Research and Development
- PublicationsN/A
- Brief summaryIn the Netherlands 30,000 individuals are suspected with acute appendicitis annually. The clinical diagnosis acute appendicitis is plagued by high negative appendectomy rates (10% to 41%) and missed diagnoses (12%). Ultrasound (US) and computed tomography (CT) are widely used to substantiate the clinical diagnosis. US has considerable limitations in accuracy, as it generates too many false negative results. Although CT is more accurate, this technique is still inaccurate in 12% of patients and results in considerable ionizing radiation exposure in often young individuals.

MRI could be an alternative form of imaging. MRI (1) is more accurate than US and possibly CT, (2) uses no ionizing radiation, (3) and requires no contrast agent. So far, MRI has been studied in series limited in size, primarily including selected (pregnant) patients with substantial differences in prevalence (10% versus the usual 60%) and with a spectrum of disease substantially different from general clinical practice. These results do not justify introducing MRI as first line imaging technique.

We propose to assess the sensitivity, specificity, predictive values and inter-observer agreement of MRI in a multicenter diagnostic accuracy study that will include a consecutive series of patients from the general population with suspected acute appendicitis. Patient acceptance and cost-effectiveness will also be evaluated.

The study builds on the experience, collaboration, logistics and infrastructure developed for the successful OPTIMA study in patients with acute abdominal pain. Included patients undergo imaging according to the draft Dutch acute appendicitis guideline: initial US in all and subsequent CT in non diagnostic US cases (i.e. US not confirming acute appendicitis). MRI is performed in all patients, but not used for patient management. Reference standard is the final diagnosis assigned by an expert panel, based on all available information including 3-months follow-up, except MRI findings. Given the anticipated MRI sensitivity (90%) and specificity (95%) and the proportion of patients with acute appendicitis (60%), a study group of 230 patients is required for sufficient precision. Study period is two years (17 months inclusion period).
- Main changes (audit trail)
- RECORD22-dec-2009 - 29-dec-2011


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