Reply to: ‘Cardiac arrest and breathing, why bother?’ Because it's too late if we wait for a definitive diagnosis - Riou, Marine; Ball, Stephen; Williams, Teresa; Whiteside, A.; Cameron, P.; Fatovich, D.; Perkins, G.; Smith, K.; Bray, Janet; Inoue, Madoka; O'Halloran, Kay; Bailey, P.; et al. (Elsevier, 2018)