Electronics for the everyday userElectromedical instrumentationP. Bergveld, 1980 Cambridge University Press, pp 134,£14.00£4.50 paperback), ISBN 0 521 21892 6Mechanics of the lower urinary tractUrodynamicsD. J. Griffiths, 1980 Adam Hilger, Bristol and the Hospital Physicists’Association, pp x + 139,£11.95. ISBN 0 85274 507 9Heart rate researchThe study of heart rate variabilityEdited by R. I. Kitney and O. Rompelman, 1980, Clarendon Press, Oxford, pp246,£25.00, ISBN 0 19 857 5335Length v quality of lifeLife extending technologiesEdited by T. J. Gordon, H. Gerjuoy and M. Anderson, 1980, Pergamon Press, Oxford, pp 280,£25.00, ISBN 0 08 0231322Practical ultrasound scanningManual of ultrasonographyK. J. W. Taylor, P. Jacobsen, C. A. Talmont, and R. Winters, 1980, Churchill Livingstone, Edinburgh, pp 211,£12.00, ISBN 0 445 08053 4