Bo Yu1, De-Jun Xu1, Huan Sun1, Kun Yang2, Min Luo1. 1. Department of Cardiology, China-Japan Union Hospital, Jilin University; 2. Department of Basic Foundation, Aviation University of Air Force, Changchun 130022, China.
Abstract
BACKGROUND: The aim of this study was to compare and analyze the tensile mechanical properties of the ascending aorta (AA) in Wistar Kyoto (WKY) rats and spontaneously hypertensive rats (SHRs), for the purpose of providing a biomechanical basis for hypertension prevention. METHODS: Pulse wave velocities (PWV) and serum nitric oxide (NO) concentrations were determined in 6-month-old WKY rats and SHRs (n = 21, n = 21, respectively). Then, 20 AAs from each group were obtained for longitudinal tensile testing. RESULTS: The maximum stress, maximum strain, and strain at a tensile stress of 16 Kpa were greater in WKY rats than in SHRs (p < 0.05). The aortic elastic modulus and PWV value were greater in SHRs than in WKY rats (p < 0.05 for both), while NO concentrations were lower in the SHR group than in the WKY group (p < 0.05). CONCLUSIONS: The AA tensile mechanical properties differed between the WKY rats and SHRs, and the tensile mechanical properties of the SHR model had changed. KEY WORDS: Ascending aorta; Hypertension; Mechanical properties; Pulse wave velocity; SHR rats; WKY rats.
BACKGROUND: The aim of this study was to compare and analyze the tensile mechanical properties of the ascending aorta (AA) in Wistar Kyoto (WKY) rats and spontaneously hypertensiverats (SHRs), for the purpose of providing a biomechanical basis for hypertension prevention. METHODS: Pulse wave velocities (PWV) and serum nitric oxide (NO) concentrations were determined in 6-month-old WKY rats and SHRs (n = 21, n = 21, respectively). Then, 20 AAs from each group were obtained for longitudinal tensile testing. RESULTS: The maximum stress, maximum strain, and strain at a tensile stress of 16 Kpa were greater in WKY rats than in SHRs (p < 0.05). The aortic elastic modulus and PWV value were greater in SHRs than in WKY rats (p < 0.05 for both), while NO concentrations were lower in the SHR group than in the WKY group (p < 0.05). CONCLUSIONS: The AA tensile mechanical properties differed between the WKY rats and SHRs, and the tensile mechanical properties of the SHR model had changed. KEY WORDS: Ascending aorta; Hypertension; Mechanical properties; Pulse wave velocity; SHR rats; WKY rats.
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