How long do you wait for response to corticosteroids and conventional synthetic DMARDs before considering IVIG in patients with HMGCR antibody positive IMNM?

Although it is possible to use IVIG monotherapy as initial treatment of anti-HMGCR myositis (without the use of steroids), it is not always possible depending on the medical insurance or patient preference. So, in case of steroids/steroid-sparing agents, I would monitor for improvement of symptoms 2...