Post-transplant haemoglobin levels and host kidney status

Area of Science:

• Nephrology
• Transplantation Immunology
• Hematology

Background:

• Erythrocytosis, or elevated red blood cell count, post-renal transplantation is often attributed to excessive erythropoietin production by the patient's native kidneys.
• Understanding the role of native kidneys in post-transplant erythrocytosis is crucial for managing patient outcomes.

Purpose of the Study:

• To investigate the impact of pre-transplant bilateral nephrectomy on post-transplant hemoglobin (Hb) and hematocrit (Ht) levels.
• To determine if the presence of host kidneys in situ influences the incidence of high Hb and Ht after renal transplantation.

Main Methods:

• Retrospective analysis of 370 renal transplant patients.
• Comparison of post-transplant Hb and Ht levels between patients with and without pre-transplant bilateral nephrectomy.
• Statistical analysis to assess the significance of differences in Hb, Ht, and the frequency of high values.

Main Results:

• Patients with host kidneys in situ had significantly higher post-transplant Hb (8.5 +/- 1.2 mmol/l vs 7.8 +/- 1.3 mmol/l, P = 0.005) and Ht (41 +/- 6% vs 38 +/- 7%, P = 0.02) compared to those who underwent bilateral nephrectomy.
• The occurrence of very high Hb and/or Ht (above the 80th percentile) was significantly more frequent in patients with host kidneys in situ (20.5% vs 3.5%, P = 0.02).

Conclusions:

• Host kidneys significantly contribute to the elevated hemoglobin and hematocrit levels observed after renal transplantation.
• Pre-transplant bilateral nephrectomy may help mitigate post-transplant erythrocytosis.