Abstract Background Intestinal ultrasound has revolutionised inflammatory bowel disease (IBD) care, as a quick, cost-effective, accurate and reliable tool for assessing IBD activity. Recently high-quality handheld ultrasound devices (HHUS) have emerged, representing a more accessible, cheaper alternative to expensive and cumbersome cart-based ultrasounds (CBUS), however their accuracy for IUS has not been studied. We aimed to assess the accuracy of HHUS compared to CBUS in a real-world IBD population. Methods We prospectively recruited patients attending outpatient IBD clinics in a tertiary centre from 18 July to 1 October 2024. Patients were first scanned by IUS trainees or clinicians certified by the Gastroenterological Network of Intestinal Ultrasound using 1-2 HHUS (Clarius™ L15 HD3 (CL) and/or GE™ Vscan Air CL (GE) using linear and convex probes as needed) and then CBUS. We collected baseline demographics, standard ultrasound parameters, disease activity classification, concordance with CBUS, and the predicted impact on clinical management. Qualitative statistical analyses and diagnostic accuracy calculations were performed. Results We performed IUS on 101 patients (49% ulcerative colitis, 52% Crohn’s disease, 46% male, median age 39 years, median BMI 23.4 kg/m2), using CL in 69 (total segments 260) and GE in 57 (total segments 220). The demographics and scan results are detailed in Table 1. Overall concordance for disease activity status (classified as "active" or "inactive") with CBUS was 93% for CL and 91% for GE, and 100% and 95% respectively for patients with a BMI >25 kg/m2. There were 5 discordant scans each for CL (7%) and GE (9%) mostly related to discrepancies in bowel wall thickness in either the sigmoid colon or terminal ileum (there was a discrepant Doppler result in 1 case), in which 4 cases for both GE and CL reported high clinician confidence with the results. It was anticipated that the discordant result would negatively impact management in 4 (5.8%) cases for CL and 3 (5.2%) cases for GE. Overall sensitivity and specificity were high in both CL (85% and 100%) and GE (76% and 100%) and remained reasonably high for all segments (see Figure 1). Conclusion Both CL and GE HHUS represent viable alternatives to CBUS, with high diagnostic accuracy for IUS in IBD patients with normal and high BMIs. Given significantly lower costs, use of HHUS could improve access to IUS in IBD care internationally. There is a small risk that rare discordant results could negatively impact management, however this risk could be mitigated by interpreting IUS findings in the context of other disease activity markers and considering a repeat IUS using CBUS where there is uncertainty regarding findings.
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