B-22 | Impact of Chronic Kidney Disease Among Adults With Hypertrophic Cardiomyopathy Undergoing Septal Myectomy

values derived by thermodilution and Fick methods were compared using Bland-Altman plots.Linear regression identified predictors of PVRi discrepancies.Results: Thermodilution-derived PVRi values were, on average, 2.0 Wood unitsm 2 lower than those calculated using the Fick method.Significant predictors of PVRi differences included elevated mean PVRi (OR 0.37, p < 0.001), height (OR -0.04, p 0.02), and body surface area (OR 2.91, p 0.01).VO 2 estimation methods contributed minimally to variability in PVRi compared to differences in Qp determination.Inconsistent use of thermodilution methods within the same patient cohort was observed.Conclusions: Standardizing PVRi calculation methods is crucial to improving the reliability of serial evaluations and interpreting therapeutic responses, given the observed discrepancies between two methods in pediatric patients with PAH.