Aura: A new respiratory monitor and apnoea alarm for spontaneously breathing patients Paper entitled 'Aura: A new respiratory monitor and apnoea alarm for spontaneously breathing patients' by A.M.Cyna, M.E.Tunstall, V.Kulkarni, J.M.S.Hutchison, and J.R.Mallard, Departments of Anaesthetics, Aberdeen Royal Infirmary and Bio-Medical Physics and Bio-Engineering, University of Aberdeen. This paper was published in the British Journal of Anaesthesia 1991. Q1-882. This copy is a copy of the final draft. 1991