48 patients were given IVMP: 44 had IVMP as 2nd-line therapy, and four were non-responders to additional intravenous immunoglobulin who were given IVMP as 3rd-line therapy. Hypertension, ⩾130 mm Hg systolic blood pressure; hypothermia, ⩽35°C; sinus bradycardia, (<60/min). No adverse effect requiring treatment was noted.

*Causal association with IVMP uncertain.