<prompt> Boy with sickle cell trait.. what mode of anaesthesia will u avoid in him??IVRA intravenous regional anesthesiaSupraclavicular brachial plexus blockBr plexus block infraclavicular approachBr plexus block axillary approach humeral approach.  <response>: Intravenous Regional Anaesthesia or Biers block absolute CI 1. Sickle cell trait 2. peripheral vascular Disease 3. Scleroderma 