1. Stabilized hypertensive haemodialysis patients, as well as those with normotension, had a greatly elevated cardiac index (CI) that was not due to hypervolemia, but was most likely secondary to their anaemic condition. The hypertension itself was not accompanied by hypervolaemia, but was associated with a relatively very high total peripheral resistance.

2. In eight patients with successfully transplanted kidneys the following results were found. (a) Five were clearly hypertensive and had supine mean arterial pressure between 117 and 143 mmHg. It is noted that they were receiving prednisone at the time of the studies. (b) CI was normal in seven. (c) Total blood volume was normal in all. (d) The presence of wide-open arterio-venous fistulae was not associated with an increase in CI.

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