Septal Curvature as a Robust and Reproducible Marker for Basal Septal Hypertrophy: Curvature in Basal Septal Hypertrophy

Basal septal hypertrophy (BSH) is an asymmetric, localised thickening of the upper interventricular septum and constitutes a marker of an early remodelling in patients with hypertension. This morphological trait has been extensively researched due to its prevalence in hypertension, yet its clinical and prognostic value for individual subjects remains undetermined. One of the reasons is the lack of a reliable and reproducible metric to quantify the presence and the extent of BSH.
This paper proposes the use of the curvature of the left ventricular endocardium as a robust feature for BSH characterisation, and as an objective criterion to quantify current subjective ‘visual assessment’ of the presence of sigmoidal septum. The proposed marker, called average septal curvature, is defined as the inverse of the radius adjacent to each point of the endocardial contour along the basal and mid inferoseptal segments of the left ventricle.
Robustness and reproducibility were assessed on a cohort of 220 patients, including 161 hypertensive patients (32 with BSH) and 59 healthy controls. Results show that compared to the conventionally used wall thickness metrics the new marker is more reproducible (relative standard deviation of errors of 7% vs. 13%, and 8% vs 38% for intra- and inter-observer variability respectively) and better correlates to the functional parameters related to BSH, with main difference (absolute rank correlation 0.417 vs 0.341) in local deformation changes assessed by longitudinal strain.
Average septal curvature is a more precisely defined and reproducible metric than thickness ratios, it can be fully automated, and better infers the functional remodelling related to hypertension.