Early experience using a purpose-built pulse train stimulator for cardiac assistance with skeletal muscle

C. W. Pattison Departments of Cardiothomcic Surgery and, Biomedical Engineering, National Heart and Lung Institute and Brampton Hospital, London, SW3 6LY, UK

R. Logan Sinclair Departments of Cardiothomcic Surgery and, Biomedical Engineering, National Heart and Lung Institute and Brampton Hospital, London, SW3 6LY, UK

D. V. E. Cumming Departments of Cardiothomcic Surgery and, Biomedical Engineering, National Heart and Lung Institute and Brampton Hospital, London, SW3 6LY, UK

D. G. Clayton Jones Departments of Cardiothomcic Surgery and, Biomedical Engineering, National Heart and Lung Institute and Brampton Hospital, London, SW3 6LY, UK

G. Goldspink Departments of Cardiothomcic Surgery and, Biomedical Engineering, National Heart and Lung Institute and Brampton Hospital, London, SW3 6LY, UK

M. J. Dunn Departments of Cardiothomcic Surgery and, Biomedical Engineering, National Heart and Lung Institute and Brampton Hospital, London, SW3 6LY, UK

M. H. Yacoub Departments of Cardiothomcic Surgery and, Biomedical Engineering, National Heart and Lung Institute and Brampton Hospital, London, SW3 6LY, UK; Departments of Royal Veterinary College, College Street, London, NIV1 OTU, UK

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Abstract

We have developed and evaluated a prototype external pulse train stimulator for use with a new technique of circulatory assistance. This involves the use of skeletal muscle (latissimus dorsi) wrapped around the thoracic aorta as an entirely autologous extra-aortic counterpulsation system. The stimulator has been successful in initiating both muscle contraction at the desired part of the cardiac cycle (diastole) and the necessary fibre-type transformation required for long-term work (fatigue resistance). The background to the development of the stimulator and the early haemodynamic results are described in this paper. The evaluation of the prototype design and the areas for future development are discussed.

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Early experience using a purpose-built pulse train stimulator for cardiac assistance with skeletal muscle

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Early experience using a purpose-built pulse train stimulator for cardiac assistance with skeletal muscle

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