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Ann Thorac Surg 1977;23:169-172
© 1977 The Society of Thoracic Surgeons

Articles

A Monitor for the Continuous Assessment of Left Ventricular Performance after Open-Heart Operations

A.E. Farnsworth, FRCS, T.A. Angerpointner, M.D., G.J.R. Lewis, MRACP, P.R. Bourne, MSc MIEE, B.T. Williams, FRCS*

Departments of Cardiothoracic Surgery and Medical Electronics, St Thomas' Hospital, London, England

Accepted for publication July 22, 1976.

* Address reprint requests to Mr. Williams, Department of Cardiothoracic Surgery, St Thomas' Hospital, London SE1 7EH, England.

A cardiac monitoring system has been developed that incorporates phasic aortic blood flow measurement by an extractable electromagnetic flow probe and high-fidelity arterial blood pressure recordings. Cardiac output, stroke volume, and peak aortic blood flow are measured continuously; using logarithmic amplifiers, the pressure-flow derivatives of left ventricular function, such as cardiac power and stroke work, are obtained beat by beat. This monitor is used to follow the postoperative course of patients undergoing cardiac operations and to evaluate the hemodynamic effect of therapeutic agents.






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