biostudies-literatureMendiola EANHLBI NIH HHSNIGMS NIH HHSCSRD VAe009768https://www.ebi.ac.uk/biostudies/studies/S-EPMC9974595biostudies-literatureUnknown16(2)<h4>Background</h4>Global indices of right ventricle (RV) function provide limited insights into mechanisms underlying RV remodeling in pulmonary hypertension (PH). While RV myocardial architectural remodeling has been observed in PH, its effect on RV adaptation is poorly understood.<h4>Methods</h4>Hemodynamic assessments were performed in 2 rodent models of PH. RV free wall myoarchitecture was quantified using generalized Q-space imaging and tractography analyses. Computational models were developed to predict RV wall strains. Data from animal studies were analyzed to determine the correlations between hemodynamic measurements, RV strains, and structural measures.<h4>Results</h4>In contrast to the PH rats with severe RV maladaptation, PH rats with mild RV maladaptation showed a decrease in helical range of fiber orientation in the RV free wall (139º versus 97º; <i>P</i>=0.029), preserved global circumferential strain, and exhibited less reduction in right ventricular-pulmonary arterial coupling (0.029 versus 0.017 mm/mm Hg; <i>P</i>=0.037). Helical range correlated positively with coupling (<i>P</i>=0.036) and stroke volume index (<i>P</i><0.01). Coupling correlated with global circumferential strain (<i>P</i><0.01) and global radial strain (<i>P</i><0.01) but not global longitudinal strain.<h4>Conclusions</h4>Data analysis suggests that adaptive RV architectural remodeling could improve RV function in PH. Our findings suggest the need to assess RV architecture within routine screenings of PH patients to improve our understanding of its prognostic and therapeutic significance in PH.Circulation. Heart failureRight Ventricular Architectural Remodeling and Functional Adaptation in Pulmonary Hypertension.PMC9974595R01 HL128661I01 CX001892P20 GM103652U54 GM115677R00 HL138288R01 HL148727Leary OPda Silva Goncalves Bos DMendiola EAChoudhary GAvazmohammadi RVang ALeichter DMZhang PGilbert RJfalseRight Ventricular Architectural Remodeling and Functional Adaptation in Pulmonary Hypertension.<h4>Background</h4>Global indices of right ventricle (RV) function provide limited insights into mechanisms underlying RV remodeling in pulmonary hypertension (PH). While RV myocardial architectural remodeling has been observed in PH, its effect on RV adaptation is poorly understood.<h4>Methods</h4>Hemodynamic assessments were performed in 2 rodent models of PH. RV free wall myoarchitecture was quantified using generalized Q-space imaging and tractography analyses. Computational models were developed to predict RV wall strains. Data from animal studies were analyzed to determine the correlations between hemodynamic measurements, RV strains, and structural measures.<h4>Results</h4>In contrast to the PH rats with severe RV maladaptation, PH rats with mild RV maladaptation showed a decrease in helical range of fiber orientation in the RV free wall (139º versus 97º; <i>P</i>=0.029), preserved global circumferential strain, and exhibited less reduction in right ventricular-pulmonary arterial coupling (0.029 versus 0.017 mm/mm Hg; <i>P</i>=0.037). Helical range correlated positively with coupling (<i>P</i>=0.036) and stroke volume index (<i>P</i><0.01). Coupling correlated with global circumferential strain (<i>P</i><0.01) and global radial strain (<i>P</i><0.01) but not global longitudinal strain.<h4>Conclusions</h4>Data analysis suggests that adaptive RV architectural remodeling could improve RV function in PH. Our findings suggest the need to assess RV architecture within routine screenings of PH patients to improve our understanding of its prognostic and therapeutic significance in PH.2023-01-01T00:00:00Z2023 Feb2025-04-03T23:51:06.391Z2025-04-03T23:51:06.391ZS-EPMC99745953674847610.1161/CIRCHEARTFAILURE.122.00976810.1161/circheartfailure.122.009768