A Study of Nusinersen Among Participants With Spinal Muscular Atrophy Who Received Onasemnogene Abeparvovec

The primary objective of this study is to evaluate the clinical outcomes following treatment with nusinersen in participants with spinal muscular atrophy (SMA) who previously received onasemnogene abeparvovec.

The secondary objectives of this study are to evaluate the safety and tolerability; and clinical outcomes following treatment with nusinersen in participants with SMA who previously received onasemnogene abeparvovec.