PURPOSE: The geometric patterns of ventricular remodeling are determined using indexed left ventricular mass (LVM), end-diastolic volume (LVEDV) and concentricity, most often measured using the mass-to-volume ratio (MVR). The aims of this study were to validate lean body mass (LBM)-based allometric coefficients for scaling and to determine an index of concentricity that is independent of both volume and LBM.METHODS: Participants from the UK Biobank who underwent both CMR and dual-energy X-ray absorptiometry (DXA) during 2014-2015 were considered (n=5064). We excluded participants aged=70years or those with cardiometabolic risk factors. We determined allometric coefficients for scaling using linear regression of the logarithmically transformed ventricular remodeling parameters. We further defined a multiplicative allometric relationship for LV concentricity (LVC) adjusting for both LVEDV and LBM.RESULTS: A total of 1638 individuals (1057 female) were included. In subjects with lower body fat percentage (<25% in males,<35% in females, n=644), the LBM allometric coefficients for scaling LVM and LVEDV were 0.85±0.06 and 0.85±0.03 respectively (R2=0.61 and 0.57, P<0.001), with no evidence of sex-allometry interaction. While the MVR was independent of LBM, it demonstrated a negative association with LVEDV in (females: r=-0.44, P<0.001; males: -0.38, P<0.001). In contrast, LVC was independent of both LVEDV and LBM [LVC=LVM/(LVEDV0.40*LBM0.50)] leading to increased overlap between LV hypertrophy and higher concentricity.CONCLUSIONS: We validated allometric coefficients for LBM-based scaling for CMR indexed parameters relevant for classifying geometric patterns of ventricular remodeling.
View details for DOI 10.1007/s00421-022-05125-9
View details for PubMedID 36617359