# Ravulizumab stabilizes life-threating intravascular hemolysis following delayed hemolytic transfusion reaction due to alloantibodies anti-e and anti-Jka: the first successful administration

## TL;DR

A new treatment using ravulizumab successfully stabilized a patient with severe blood cell destruction caused by a transfusion reaction.

## Contribution

The first successful use of ravulizumab to treat intravascular hemolysis due to delayed hemolytic transfusion reaction.

## Key findings

- Ravulizumab rapidly improved a patient's condition with life-threatening hemolysis after a blood transfusion.
- The patient achieved full hematologic and biochemical recovery within three weeks of treatment.
- The case suggests complement inhibitors like ravulizumab may be effective in severe complement-mediated hemolysis.

## Abstract

This report describes the first successful administration of ravulizumab, a C5 complement inhibitor, in the treatment of life-threatening intravascular hemolysis (IVH) caused by delayed hemolytic transfusion reaction (DHTR) in a 22-year-old woman. The patient developed acute IVH with severe anemia and hemodynamic instability seven days after receiving a blood transfusion for posthemorrhagic anemia following a missed abortion. Laboratory investigations revealed anti-e and anti-Jka alloantibodies consistent with DHTR. Despite treatment, her hemoglobin level declined further, raising concerns for hyperhemolytic syndrome. After the administration of ravulizumab, her condition improved rapidly, and she was discharged with stable hemoglobin levels. Within three weeks there was full hematologic and biochemical recovery. This case demonstrates the therapeutic potential of ravulizumab in the management of severe complement-mediated hemolysis due to DHTR, and highlights the need for further research on complement inhibitors in similar conditions.