Differences of alternative methods of measuring abdominal wall hernia defect size: a prospective observational study
Despite the importance of defect size, there are no standardized recommendations on how to measure ventral hernias. Our aims were to determine (1) if any significant differences existed between various methods of measuring ventral hernias and (2) the effect of these methods of measurement on selection of mesh size.
A prospective study of all patients enrolled in a randomized trial assessing laparoscopic ventral hernia repair at a single institution from 3/2015 to 7/2016 was eligible for inclusion. Abdominal wall hernia defect size was determined by multiplying defect length and width obtained separately using each of five methods: radiographic (CT), intraoperative with abdomen desufflated, intraoperative with abdomen insufflated to 15 mmHg (intra-abdominal aspect), intraoperative with abdomen insufflated to 15 mmHg (extra-abdominal aspect), and clinical. The primary outcome was intraclass correlation between the five different methods of measurement for each patient. Secondary outcome was changes in mesh selection assuming a 5 cm overlap in each direction.
Fifty patients met inclusion criteria for assessment. The five different measurement methods had an intraclass correlation for each patient of 0.533 (95% CI 0.373–0.697) (weak correlation) for length; 0.737 (95% CI 0.613–0.844) (moderate correlation) for width; and 0.684 (95% CI 0.544–0.810) (moderate correlation) for area. Different types of measurements affected mesh selection in up to 56% of cases.
Among five common methods of measuring abdominal wall hernia defect, sizes are only weakly to moderately correlated. Further studies are needed to determine which method results in optimally sized abdominal wall prostheses and superior ventral hernia repair.
KeywordsCorrelation Measurements Ventral Hernia defect Mesh
None. The first (corresponding) author is willing to make the data, analytic methods, and study materials available to other researchers. This material can be obtained by communicating with Dr. Cherla at firstname.lastname@example.org (institutional email).
This work was supported by the Center for Clinical and Translational Sciences, which is funded by National Institutes of Health Clinical and Translational Award UL1 TR000371 and KL2 TR000370 from the National Center for Advancing Translational Sciences. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Center for Research Resources or the National Institutes of Health. The funding agencies were not involved in the study design, data collection, data analysis, manuscript preparation, or publication decisions. All authors had complete access to the study data that support the publication.
Compliance with ethical standards
Drs. Cherla, Lew, Escamilla, Holihan, Gonzalez, Ko, Kao, Liang, and Mr. Cherla have no conflicts of interest or financial ties to disclose.
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