457. On call work in rheumatology with a focus on vasculitis

Background/ Objectives: Our aim was to evaluate the impact of vasculitis on a physician led on call service in rheumatology. The objectives were: to measure differences in demand to the service from patients with vasculitis or suspected vasculitis (including GCA) compared to other conditions; to assess the most common concerns requiring urgent attention; to determine changes in the volume of new urgent referrals, suspected flares or non-referral enquiries for patients with suspected or established vasculitis compared to other rheumatological conditions. Methods: We evaluated data captured by clinicians using a bespoke Microsoft Form, prospectively collected whilst on call, every time a contact was made with primary or secondary care during a 12 month period from October 2020 to October 2021. Calls could be via telephone or urgent email. We compared the on call data for patients with vasculitis with that for RA (using Chi squared testing) and other conditions. Results: We received 1929 “calls” during the one year study period (1364 telephone vs 565 emails), of whom 1552 had a provisional or actual diagnosis recorded. The two largest groups of conditions for calls were vasculitis (21.3%) and RA (18.5%). More calls were received for suspected new vasculitis than for suspected RA (213 vs 93), whilst more calls were for existing patients with RA vs vasculitis (195 vs 118) (P