Study	Reason for exclusion
Deitch 2007	Not relevant interventions: supplemental oxygen vs compressed air for midazolam and fentanyl PSA. Retrospectively analysed blinded capnography data.
Deitch 2008	Not relevant interventions: supplemental oxygen vs compressed air for propofol PSA. Retrospectively analysed blinded capnography data.
Hart 1997	Non‐relevant interventions: RCT comparing fentanyl vs fentanyl‐midazolam vs meperidine‐promethazine‐chlorpromethazine compound as sedation drugs for PSA.
Sivilotti 2010	Non‐relevant interventions: RCT comparing sedation drugs for PSA then retrospectively analysed for adverse events and utility of capnography.

PSA: procedural sedation and analgesia; RCT: randomized controlled trial.