*Report of a lecture delivered at a meeting sponsored by the Cape Town Post-Graduate Medical Association, the Cape Western Branch of the Medical Association of South Africa and the University of Cape Town on Tuesday, 15 May 1951.
It is demonstrated that the blood pressure level is not necessarily an index of adequate circulation. Adequate circulation can apparently still be present in the presence of profound hypotensive states. The clinical application of hypotensive states to reduce operative bleeding is discussed. The use of Hexathide and regional analgesia in the production of hypotension is descriptionbed and the relative merits of each for various operations discussed. The necessity for further study of this technique is emphasized.