Key result
Restrictive physiology after RVOT reconstruction protects the RV from irreversible dilation by enhancing myocardial stiffness.
Why the study?
Does right ventricular outflow tract reconstruction alter the dynamics of MMP-2, MMP-9, and PINP compared to septal defect repair in predicting postoperative remodeling?
Cohort (n=40)
Does right ventricular outflow tract reconstruction alter the dynamics of MMP-2, MMP-9, and PINP compared to septal defect repair in predicting postoperative remodeling?
Persistent elevation of MMP-2 and PINP after right ventricular outflow tract reconstruction reflects active remodeling, with restrictive physiology potentially protecting the right ventricle from irreversible dilation under chronic volume overload.
Answers are grounded in this paper and cite their sources.
May support expectant management in restrictive physiology after RVOT reconstruction; extends understanding of adaptive responses in chronic RV volume overload.
Objective: Right ventricular outflow tract reconstruction frequently leads to long-term pulmonary failure and ventricular dilation. This study aims to investigate the dynamics of matrix metalloproteinase-2, matrix metalloproteinase-9, and procollagen type-1 N -terminal propeptide in predicting postoperative remodelling and to evaluate the “protective” potential of restrictive right ventricular physiology. Methods: This prospective comparative cohort study included 20 patients undergoing right ventricular outflow tract reconstruction (Research Group) and 20 patients undergoing atrial or ventricular septal defect repair via transatrial approach (Control Group). Biomarker levels were measured using ELISA at preoperative, early postoperative (24–48 hours), and 6-month intervals. Right ventricular geometry was assessed with cross-sectional snapshots at 6 months and 10 years. Right ventricular dilation was defined as right ventricular end-diastolic volume index > 150 ml/m 2 or diameter z -score > 2, while preserved geometry was defined as right ventricular end-diastolic volume index < 100 ml/m 2 or diameter z -score < 1.5. Results: Early postoperative biomarker increases were similar ( p = 0.310) but differed significantly at 6 months. In the study group, matrix metalloproteinase-2 ( p < 0.001) and procollagen type-1 N -terminal propeptide ( p = 0.001) levels remained significantly elevated, independent of pulmonary regurgitation severity ( p > 0.05). Ten years later, restrictive physiology was observed in 10 patients (50%), representing a progression compared to the 8 patients identified at 6 months. Conclusion: Persistent elevation of matrix metalloproteinase-2 and procollagen type-1 N -terminal propeptide reflects an active “remodeling” process. Restrictive physiology is associated with the “Biological Banding” mechanism. By increasing myocardial stiffness, this adaptive process is linked to protecting the right ventricle from irreversible dilation under chronic volume overload.
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Aslan et al. (2026) conducted a cohort in Right ventricular outflow tract reconstruction (n=40). Right ventricular outflow tract reconstruction vs. Atrial or ventricular septal defect repair via transatrial approach was evaluated on Biomarker levels (matrix metalloproteinase-2, matrix metalloproteinase-9, and procollagen type-1 N-terminal propeptide) at 6 months (p=<0.001). Right ventricular outflow tract reconstruction was associated with persistently elevated matrix metalloproteinase-2 and procollagen type-1 N-terminal propeptide at 6 months.
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