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Thermomechanical behavior of human carotid arteries in the passive state

¹Departamento de Ciencia de Materiales, E. T. S. de Ingenieros de Caminos, Universidad Politécnica de Madrid, and ²Departamento de Patología Cardiaca, Hospital Clínico Universitario San Carlos, Madrid, Spain; and ³Department of Mechanical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan

Submitted 28 October 2004 ; accepted in final form 28 January 2005

Localized heating or cooling is expanding the clinical procedures used to treat cardiovascular diseases. Advantageous implementation and development of these methods are linked indissolubly to a deeper understanding of the arterial response to combined mechanical and thermal loads. Despite this, the basic thermomechanical behavior of human blood vessels still remains largely unknown, primarily due to the lack of appropriate experimental data. In this work, the influence of temperature on the passive behavior of human carotid arteries was studied in vitro by means of inflation tests. Eleven carotid segments were tested in the range 0–200 mmHg at four different temperatures of 17, 27, 37, and 42°C. The results show that the combined change of temperature and stress has a dramatic effect on the dilatation coefficient of the arterial wall, which is shifted from negative to positive depending on the stress state, whereas the structural stiffness of the arterial wall does not change appreciably in the range of temperatures tested.

blood vessels; inflation tests; thermal dilatation coefficient; mechanical properties; structural stiffness

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