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Different Responses of Arterial Stiffness between the Aorta and the Iliofemoral Artery during the Administration of Phentolamine and Atenolol in Rabbits

  • Katsuda Shin-ichiro
    Department of Cellular and Integrative Physiology, Fukushima Medical University School of Medicine
  • Fujikura Yuko
    Yuri Kumiai General Hospital
  • Horikoshi Yuko
    Department of Clinical Laboratory Sciences,School of Health Sciences, Fukushima Medical University
  • Hazama Akihiro
    Department of Cellular and Integrative Physiology, Fukushima Medical University School of Medicine
  • Shimizu Tsuyoshi
    Shimizu Institute of Space Physiology, Suwa Maternity Clinic
  • Shirai Kohji
    Seijinkai Mihama Hospital

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Abstract

<p>Aim: The mechanism underlying the stiffness of the aorta and iliofemoral artery that is required to maintain blood pressure (BP) is unclear. A new stiffness index of the aorta (aBeta) and iliac-femoral arteries (ifBeta) was defined by applying the cardio-ankle vascular index (CAVI). We compared changes in stiffness of the two arteries in response to reduced BP, due to the non-selective α adrenergic blocker phentolamine and the β1 adrenergic blocker atenolol, in rabbits. </p><p>Methods: Pressure waves at the origin (oA) and distal ends of the aorta (dA) and the distal end of the left femoral artery (fA) were recorded simultaneously using three pressure sensors in 25 anesthetized rabbits. Phentolamine (50 µg/kg/min) and atenolol (10 mg/kg/min) were infused for 2 min. The pulse wave velocity (PWV) in each artery was determined; aBeta, ifBeta, and whole Beta (aifBeta) were calculated by the following formula; Beta=2ρ/PP×ln(SBP/DBP)×PWV2 (ρ: blood density; SBP, SBP, and PP: systolic, diastolic, and pulse pressures, respectively). </p><p>Results: SBP and DBP at oA, dA, and fA decreased by the administration of phentolamine and atenolol, with and without decreased total peripheral vascular resistance. After phentramine infusion, cardiac output (CO), aBeta, and aifBeta increased, while ifBeta decreased. After infusion of atenolol, CO decreased, while aBeta, ifBeta, and aifBeta remained unchanged. </p><p>Conclusion: The contradictory reactions of aBeta and ifBeta to phentolamine suggest that the stiffness of the aorta and ilio-femoral artery is regulated separately during decreased BP induced by phentolamine, but not by atenolol. </p>

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