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Following the administration of recombinant human erythropoietin (rHuEPO) to 18 patients undergoing hemodialysis, the hematocrit (Ht) increased from 19.7 +/- 1.8 to 31.0 +/- 2.0%. The incidence of hypertension according to the criteria of WHO was 11.1%. The systolic blood pressure (SBP) increased significantly from 120 +/- 21 to 129 +/- 26 mmHg (p less than 0.01) and diastolic blood pressure (DBP) increased from 67 +/- 14 to 73 +/- 12 mmHg (p less than 0.05). The cardiac index (CI) decreased significantly from 4.07 +/- 1.13 to 3.56 +/- 0.88 L/min/m2 (p less than 0.05). Total peripheral resistance index (TPRI) and blood volume (BV) increased significantly from 1,725 +/- 406 to 2,170 +/- 643 dynes/sec/cm-5/m2 (p less than 0.001) and from 78.9 +/- 11.2 to 87.8 +/- 14.8 ml/kg (p less than 0.005) respectively. Pulse rate (PR) decreased significantly from 73.0 +/- 10.7 to 65.9 +/- 7.8 beats/min (p less than 0.01). Patients who developed a blood pressure (BP) elevation of 10% or more for the mean blood pressure (MBP) showed a slight and insignificant decrease in CI from 3.65 +/- 1.12 to 3.49 +/- 1.06 L/min/m2, which clearly contrasted to that in another group of patients who showed a reduced increase in MBP and a significant reduction in CI from 4.50 +/- 1.03 to 3.63 +/- 0.72 L/min/m2 (p less than 0.05). Stroke volume index (SVI) was unchanged in both groups but PR decrease significantly in the latter group. A significant increase in TPRI or BV was observed equally in both groups.(ABSTRACT TRUNCATED AT 250 WORDS)

Hemodynamic mechanism of the elevation in blood pressure following the improvement of anemia with recombinant human erythropoietin.