Rh(D) Alloimmunization Risk After Rh(D)-Incompatible Solid Organ Transplantations in Rh(D)-Negative Recipients.

Objectives: Rh(D)-incompatible (Rh-i) solid organ transplantations are not considered for organ matching, but no consensus guidelines exist regarding the need for anti-D immunoglobulin (RhIG) prophylaxis.

Methods: We reviewed 35 Rh(D)-negative patients who had received Rh-i solid organ transplantation. We divided the patients into a RhIG-administered group and a nonadministered group. All patients also underwent an antibody screening test to assess Rh alloimmunization. Graft function was monitored with serum creatinine or bilirubin and kidney or liver biopsy whenever a rejection was suspected. Overall survival was also assessed.

Results: The median (range) age of transplant recipients was 48.5 (4-69) years, and 73.5% of patients were male. Median (range) follow-up time after transplantation was 60 (2-246) months. In the RhIG nonadministered group (n = 16), anti-D was not detected in any of the patients. More rejection episodes occurred in the RhIG-administered group among those undergoing kidney transplant (P = .0278).

Conclusions: The low rate of Rh(D) alloimmunization is associated with the immunosuppressive state of the patients. RhIG prophylaxis seems to have no clinical benefit in Rh-i solid organ transplantation.