From the Journals
New study establishes IBD severity index
Crohn’s disease severity was based on intestinal damage, whereas ulcerative colitis disease severity was associated with symptoms and daily life...
WASHINGTON – The same Spanish research team who introduced an MRI-based formula for scoring the activity of luminal Crohn’s disease in 2011 have developed and validated a new, simplified version of their MRI score that speeds assessment.
“The simplified version of the MaRIA [Magnetic Resonance Index of Activity] score allows a faster and easier assessment of inflammation and quantification of severity in Crohn’s disease by keeping high accuracy for diagnosis and therapeutic response,” Ingrid Ordás, MD, said at the annual Digestive Disease Week®. The main advantage of the simplified MaRIA is that it is a “less time-consuming calculation that is not confounded by missing segments,” said Dr. Ordás, a gastroenterologist at the Hospital Clinic of Barcelona.
Although the data reported by Dr. Ordás included the derivation results, which used 98 patients enrolled in two separate prospective studies, and a separate prospective validation cohort of 37 patients, all these patients were evaluated by clinicians at the Hospital Clinic of Barcelona, and hence further validation with patients enrolled at other sites is now needed, Dr. Ordás said in an interview. Further accumulation of evidence for high sensitivity and specificity of Crohn’s disease assessment using the simplified MaRIA could allow it to replace endoscopy as the standard tool for assessing disease activity and severity in patients with luminal Crohn’s disease.
The derivation phase of the study identified four features that significantly correlated with disease activity and severity: bowel wall thickening to more than 3 mm, mural edema, perienteric fat stranding, and mucosal ulcerations. Limiting assessment to these four features cut in half the elements in the original MaRIA (Inflamm Bowel Dis. 2011 Aug;17[8];1759-68). Fat stranding – loss of the usual sharp interface between the wall and mesentery because of fluid – is a new parameter in the simplified MaRIA. The other three elements had been in the original index, but several other elements are now gone, including relative contrast enhancement wall signal intensity and consideration of lymph nodes.
In the validation phase, the researchers compared the MaRIA findings of the validation cohort with endoscopy findings both at baseline and then after they had received treatment. The sensitivity and specificity of the simplified MaRIA depended on the cutoff used, but as an example, a patient with a simplified MaRIA of 1 or greater as having active disease had a sensitivity of 90%, specificity of 81%, and an area under the receiver operator characteristic curve of 0.91. Using a simplified MaRIA of at least 2 as indicative of severe disease had a sensitivity of 85%, a specificity of 92%, and an AUROC of 0.94, Dr. Ordás reported.
Further assessment in patients who underwent treatment showed that reductions in the simplified MaRIA significantly correlated with treatment responses and remained essentially unchanged in patients who did not have clinical response to treatment. The analysis also showed a strong, positive correlation coefficient of 0.83 when the simplified MaRIA of an individual patient, compared with the patient’s Crohn’s disease endoscopy index of severity, and a correlation coefficient of 0.94 when a patient’s simplified MaRIA determined by one clinician, compared with the index score calculated by a second clinician.
Dr. Ordás had no disclosures to report.
SOURCE: Ordás I et al. DDW 2018, Presentation 437.
