Letter to the Editor Methodological Considerations on the Use of Inferior Vena Cava Ultrasonography in Gastrointestinal Bleeding

Commentary on “Evaluation of Volume Status and Treatment Response with Point-of-Care Inferior Vena Cava Ultrasound in Patients with Gastrointestinal Bleeding

Abstract

We read with interest the recent study evaluating inferior vena cava (IVC) ultrasonography as a tool for assessing volume status and prognosis in patients with gastrointestinal bleeding (GIB). The integration of point-of-care ultrasound into early hemodynamic assessment represents an important and evolving area in emergency medicine. However, several methodological considerations merit further clarification. First, an apparent inconsistency between IVC diameter, collapsibility index (IVCCI), and reported outcome associations may affect interpretability. Second, although the study reports an independent association with poor outcomes, no multivariable adjustment analysis is described, limiting causal inference. Third, the incremental prognostic value of IVC measurements over validated risk scores such as the Glasgow-Blatchford Score and AIMS65 was not evaluated. Finally, operator dependency and measurement variability were not addressed. We believe that clarification of these issues and incorporation of multivariate modeling in future studies would strengthen the evidence base regarding the clinical utility of IVC-derived parameters in GIB.