Starting eculizumab as rescue therapy in refractory myasthenic crisis.

INTRODUCTION: Myasthenia gravis is a long-lasting autoimmune neuromuscular disease caused by antibodies attacking the neuromuscular junction, which can result in muscle weakness, fatigue, and respiratory failure in severe cases. Myasthenic crisis is a life-threatening event that requires hospitalization and treatments with intravenous immunoglobulin or plasma exchange. We reported the case of an AChR-Ab-positive myasthenia gravis patient with refractory myasthenic crisis, in which starting eculizumab as rescue therapy led to a complete resolution of the acute neuromuscular condition. CASE PRESENTATION: A 74-year-old man diagnosed with myasthenia gravis. ACh-receptor antibodies positivity comes to our observation for a recrudescence of symptoms, unresponsive to conventional rescue therapies. Due to the clinical worsening over the following weeks, the patient was admitted to intensive care unit, where he underwent therapy with eculizumab. About 5 days after the treatment, there was a significant and complete recovery of clinical condition with weaning-off from invasive ventilation and discharge to outpatient regimen, with reduction of steroid intake and biweekly maintenance with eculizumab. DISCUSSION: Eculizumab, a humanized monoclonal antibody that inhibits complement activation, is now approved as treatment for refractory generalized myasthenia gravis with anti-AChR antibodies. The use of eculizumab in myasthenic crisis is still investigational, but this case report suggests that it may be a promising treatment option for patients with severe clinical condition. Ongoing clinical trials will be needed to further evaluate the safety and efficacy of eculizumab in myasthenic crisis.