Key result
UniLine 26 mm bioprostheses maintain stable hemodynamics with low gradients across varying pressure loads in vitro.
Why the study?
The hydrodynamic performance of the domestic atrioventricular bioprosthesis UniLine (size 26 mm) across multiple standardized pressure loading modes had not been previously assessed.
Answers are grounded in this paper and cite their sources.
UniLine 26 mm atrioventricular bioprostheses demonstrate stable in vitro hydrodynamic performance across a wide spectrum of simulated blood pressure conditions, meeting GOST and ISO standards.
Highlights The study provides the first extended in vitro assessment of UniLine bioprostheses across six standardized pressure modes: from hypotension to very severe hypertension, establishing reference hydrodynamic values for domestic heart valve technologies. The bioprostheses demonstrated high stability of essential performance metrics (effective orifice area 1.45–1.53 cm²; mean gradient 4.23–4.38 mmHg) under increasing hemodynamic loads, confirming the adequacy of their structural design and reliability across a broad spectrum of simulated clinical conditions. Regurgitation values under extreme loading revealed intrinsic variability of biological tissues, highlighting the need to account for biomechanical heterogeneity in future engineering optimization and comparative evaluation of domestic bioprosthetic Aim. To evaluate the hydrodynamic performance of the domestic atrioventricular bioprosthesis UniLine (size 26 mm) under multiple loading modes defined by GOST 31618.1-2012. Methods. Twelve prostheses were tested in vitro using the Pulse Duplicator II across six pressure modes: from hypotensive (60/40 mmHg) to very severe hypertension (210/120 mmHg). Heart rate was set at 70 bpm with 35% systolic duration. Three metrics were assessed: mean transvalvular gradient, effective orifice area, and regurgitant volume. Data are presented as median [25 th ; 75 th percentile]. Results . Effective orifice area remained stable across modes (1.45–1.53 cm²; range 1.39–1.81 cm²). Mean gradient remained low, from 4.23 mmHg in hypotension to 4.32–4.38 mmHg in severe/very severe hypertension (overall range 1.55–6.03 mmHg). Regurgitant volume increased with pressure load, from 2.66 to 4.09 mL/cycle (maximum 8.04 mL/cycle in individual tests). All parameters met GOST and ISO requirements. Conclusion . UniLine bioprostheses demonstrate stable hydrodynamic behavior across a broad range of loading conditions, characterized by low gradients, consistent effective orifice area, and acceptable regurgitation. These results provide reference values supporting further optimization and extended preclinical evaluation.
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Ovcharenko et al. (2026) studied In vitro hydrodynamic testing of atrioventricular bioprostheses (n=12). UniLine atrioventricular bioprosthesis (26 mm) vs. Six standardized pressure modes (hypotensive 60/40 mmHg to very severe hypertension 210/120 mmHg) was evaluated on Mean transvalvular gradient, effective orifice area, and regurgitant volume. UniLine 26 mm bioprostheses showed stable in vitro effective orifice area, low mean gradients, and regurgitant volume of 2.66-4.09 mL/cycle across pressure modes.
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