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Research Article| Volume 76, ISSUE 4, P560-568, October 1970

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Vascular reactivity and mechanical properties of normal and cadmium-hypertensive rabbits

  • Gurdarshan S. Thind
    Correspondence
    Reprint requests: Dr. G. S. Thind, Dept. of Medicine, The Graduate Hospital of University of Pennsylvania, 19th & Lombard Sts., Philadelphia, Pa. 19146.
    Affiliations
    From the Departments of Medicine and Surgery and Bockus Research Institute of the Graduate Hospital, University of Pennsylvania School of Medicine Philadelphia, Pa., USA
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  • George Karreman
    Affiliations
    From the Departments of Medicine and Surgery and Bockus Research Institute of the Graduate Hospital, University of Pennsylvania School of Medicine Philadelphia, Pa., USA
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  • Kathryn F. Stephan
    Affiliations
    From the Departments of Medicine and Surgery and Bockus Research Institute of the Graduate Hospital, University of Pennsylvania School of Medicine Philadelphia, Pa., USA
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  • William S. Blakemore
    Affiliations
    From the Departments of Medicine and Surgery and Bockus Research Institute of the Graduate Hospital, University of Pennsylvania School of Medicine Philadelphia, Pa., USA
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      Abstract

      Persistent hypertension was produced in 100 per cent of rabbits by weekly intraperitoneal injections of 2 mg. per kilogram of cadmium acetate. Growth and development of cadmium-hypertensive rabbits did not differ in any obvious way from that of control normotensive rabbits. Aortic wall thickness was normal, and there were no gross or histopathologic changes in cadmium-treated rabbits. Cadmium-hypertensive aortic strips developed a significantly lower passive tension on stepwise increase in strain (0 to 80 per cent) applied to the strips. Vascular reactivity of aortic strips obtained from the cadmium-hypertensive rabbits revealed a significantly decreased responsiveness to angiotensin but not to norepinephrine. Incubation in external cadmium (1.0 to 100.0 μg per milliliter of CdCl2) had no differential effect on the responses of control normotensive and cadmium-hypertensive aortic strips to either angiotensin or norepinephrine. It is suggested that the altered vascular reactivity and mechanical properties may be important in the pathophysiology of cadmium hypertension.
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