1. NHS IMPROVEMENTS Improvement Patient Safety Residual anaesthetic drugs in cannulae and intravenous lines 2014 https://improvement.nhs.uk/documents/961/psa-residual-anaesthetic-drugs.pdf
2. NHS Improvement Patient Safety Alert Confirming removal or flushing of lines and cannulae after procedures 2017 https://improvement.nhs.uk/documents/1922/Patient_Safety_Alert_-_Confirming_removal_or_flushing_of_lines_and_cannulae_af_EVC1Yb2.pdf