247. CHARACTERISTICS, OUTCOMES AND PROGNOSTIC FACTORS OF PATIENTS WITH ACUTE MANIFESTATION OF SMALL VESSEL VASCULITIS ADMITTED TO INTENSIVE CARE: AN 18-YEAR SINGLE-CENTRE EXPERIENCE. (29th March 2019) - Xu, Yiwang; Gopaluni, Seerapani; Varley, James; Willcocks, Lisa; Jayne, David; Jones, Rachel