Which is false with regards to a Biers Block?

• A. If regional block lasts for 40 60 mins
• B. the minimal duration of cuff inflation is 20 mins
• C. bupivicaine can be used at a smaller dose of 1/mg/kg, but the cuff must remain up for at least 40 mins
• D. lignocaine can be used safely
• E. it is contraindicated in patients with sickle cell disease and Raynauds disease