Procedural Sedation in the ICU — Capnography, Agents & the Safety Bundle

Also known as Procedural sedation · Conscious sedation · Moderate sedation · Deep sedation · Capnography · End-tidal CO2 · Propofol · Ketamine · Midazolam · Fentanyl · Etomidate · Dexmedetomidine · Naloxone · Flumazenil · Sedation continuum

The procedural sedation is a drug-induced depression of the consciousness for a painful or an unpleasant procedure, maintaining the spontaneous ventilation and the airway reflexes (distinct from the general anaesthesia, where the airway is unprotected and the ventilation supported). The continuum runs from the minimal to the moderate, the deep, and the general anaesthesia — as the depth increases, the airway, the reflexes, the respiration, and the cardiovascular function are progressively compromised. The goal is the analgesia plus the anxiolysis plus the amnesia plus the immobility, with the cardiorespiratory stability and the rapid recovery. The safety bundle: the pre-procedure assessment (the fasting, the airway, the ASA status), the monitor…

high22 referencesUpdated 26 July 202620 min readVerification in progress

Practise this topic

8 MCQs

The one-line answer

Procedural sedation is a drug-induced depression of consciousness for a painful or unpleasant procedure that keeps the patient breathing on their own with their airway reflexes intact — the line that separates it from general anaesthesia. The goal is four things at once — analgesia, anxiolysis, amnesia, immobility — with cardiorespiratory stability and rapid recovery. The safety bundle is non-negotiable: a pre-procedure airway and ASA assessment, continuous capnography (the standard of care, not optional), a dedicated observer who is not the operator, rescue equipment at the bedside, and reversal agents drawn up. The agents are chosen to the patient and the depth — propofol for rapid deep sedation, ketamine for the shocked or asthmatic, dexmedetomidine for cooperative sedation, and midazolam-fentanyl as the forgiving combination.^[1]

Meet the patient

A 62-year-old with septic shock needs a central line. He is ASA III, on noradrenaline, not fasted, with a beard and a receding chin. The registrar wants to push propofol and get on with it. The capnography is still in the drawer.^[1]

This is the patient procedural sedation is designed for — and the patient it kills when the bundle is skipped. Three things will decide whether he leaves the procedure safely: is his airway assessable, who is watching him breathe, and is the waveform on the screen. Hold those three and the rest of this page slots into place.^[1]^[2]

References22Show

[1]Godwin SA, Burton JH, Gerardo CJ, et al. Clinical policy: procedural sedation and analgesia in the emergency department Ann Emerg Med, 2014.PMID 24438649
[2]American Society of Anesthesiologists Task Force on Moderate Procedural Sedation and Analgesia. Practice Guidelines for Moderate Procedural Sedation and Analgesia 2018: A Report by the American Society of Anesthesiologists Task Force on Moderate Procedural Sedation and Analgesia, the American Association of Oral and Maxillofacial Surgeons, American College of Radiology, American Dental Association, American Society of Dentist Anesthesiologists, and Society of Interventional Radiology Anesthesiology, 2018.PMID 29334501
[3]Deitch K, Chudnofsky CR, Dominici P The utility of supplemental oxygen during emergency department procedural sedation with propofol: a randomized, controlled trial Ann Emerg Med, 2008.PMID 18294729
[4]Deitch K, Miner J, Chudnofsky CR, Dominici P, Latta B. Does end tidal CO2 monitoring during emergency department procedural sedation and analgesia with propofol decrease the incidence of hypoxic events? A randomized, controlled trial Ann Emerg Med, 2010.PMID 19783324
[5]Burton JH, Harrah JD, Germann CA, Dillon DC. Does end-tidal carbon dioxide monitoring detect respiratory events prior to current sedation monitoring practices? Acad Emerg Med, 2006.PMID 16569750
[6]Green SM, Roback MG, Krauss B, et al. Predictors of airway and respiratory adverse events with ketamine sedation in the emergency department: an individual-patient data meta-analysis of 8,282 children Ann Emerg Med, 2009.PMID 19201064
[7]Green SM, Roback MG, Krauss B, et al. Predictors of emesis and recovery agitation with emergency department ketamine sedation: an individual-patient data meta-analysis of 8,282 children Ann Emerg Med, 2009.PMID 19501426
[8]Vargo JJ. Safety in numbers: the case for endoscopist-directed propofol sedation Endosc Int Open, 2015.PMID 26528491
[9]Miner JR, Gray R, Delavari P, et al. Alfentanil for procedural sedation in the emergency department Ann Emerg Med, 2011.PMID 20947206
[10]Aldrete JA. A postanesthetic recovery score Anesth Analg, 1970.PMID 5534693
[11]Jabre P, et al. Etomidate versus ketamine for rapid sequence intubation in acutely ill patients: a multicentre randomised controlled trial Lancet, 2009.PMID 19573904
[12]Kam PC, Cardone D Propofol infusion syndrome Anaesthesia, 2007.PMID 17567345
[13]Mirrakhimov AE, et al. Propofol infusion syndrome in adults: a clinical update Crit Care Res Pract, 2015.PMID 25954513
[14]Rahman NH, et al. The use of propofol for procedural sedation and analgesia in the emergency department: a comparison with midazolam Emerg Med J, 2011.PMID 21098799
[15]Soysal S, et al. Comparison of meperidine plus midazolam and fentanyl plus midazolam in procedural sedation: a double-blind, randomized controlled trial Adv Ther, 2004.PMID 15727400
[16]Masoumi K, et al. Dexmedetomidine versus Midazolam-Fentanyl in Procedural Analgesia Sedation for Reduction of Anterior Shoulder Dislocation: A Randomized Clinical Trial Rev Recent Clin Trials, 2019.PMID 31400271
[17]Riker RR, et al. Dexmedetomidine vs midazolam for sedation of critically ill patients: a randomized trial JAMA, 2009.PMID 19188334
[18]Pandharipande PP, et al. Effect of sedation with dexmedetomidine vs lorazepam on acute brain dysfunction in mechanically ventilated patients: the MENDS randomized controlled trial JAMA, 2007.PMID 18073360
[19]Devlin JW, et al. Clinical Practice Guidelines for the Prevention and Management of Pain, Agitation/Sedation, Delirium, Immobility, and Sleep Disruption in Adult Patients in the ICU Crit Care Med, 2018.PMID 30113379
[20]Girard TD, et al. Efficacy and safety of a paired sedation and ventilator weaning protocol for mechanically ventilated patients in intensive care (Awakening and Breathing Controlled trial): a randomised controlled trial Lancet, 2008.PMID 18191684
[21]Krauss BS, et al. Characteristics of and Predictors for Apnea and Clinical Interventions During Procedural Sedation Ann Emerg Med, 2016.PMID 27553482
[22]Zhou Y, et al. Flumazenil reversal of remimazolam-induced sedation: a narrative review of safety, pharmacokinetics, and clinical considerations Front Med, 2026.PMID 42089078

Procedural Sedation in the ICU — Capnography, Agents & the Safety Bundle

high22 referencesUpdated 26 July 202620 min readVerification in progress

Practise this topic

8 MCQs

Meet the patient

References22Show

[1]Godwin SA, Burton JH, Gerardo CJ, et al. Clinical policy: procedural sedation and analgesia in the emergency department Ann Emerg Med, 2014.PMID 24438649
[2]American Society of Anesthesiologists Task Force on Moderate Procedural Sedation and Analgesia. Practice Guidelines for Moderate Procedural Sedation and Analgesia 2018: A Report by the American Society of Anesthesiologists Task Force on Moderate Procedural Sedation and Analgesia, the American Association of Oral and Maxillofacial Surgeons, American College of Radiology, American Dental Association, American Society of Dentist Anesthesiologists, and Society of Interventional Radiology Anesthesiology, 2018.PMID 29334501
[3]Deitch K, Chudnofsky CR, Dominici P The utility of supplemental oxygen during emergency department procedural sedation with propofol: a randomized, controlled trial Ann Emerg Med, 2008.PMID 18294729
[4]Deitch K, Miner J, Chudnofsky CR, Dominici P, Latta B. Does end tidal CO2 monitoring during emergency department procedural sedation and analgesia with propofol decrease the incidence of hypoxic events? A randomized, controlled trial Ann Emerg Med, 2010.PMID 19783324
[5]Burton JH, Harrah JD, Germann CA, Dillon DC. Does end-tidal carbon dioxide monitoring detect respiratory events prior to current sedation monitoring practices? Acad Emerg Med, 2006.PMID 16569750
[6]Green SM, Roback MG, Krauss B, et al. Predictors of airway and respiratory adverse events with ketamine sedation in the emergency department: an individual-patient data meta-analysis of 8,282 children Ann Emerg Med, 2009.PMID 19201064
[7]Green SM, Roback MG, Krauss B, et al. Predictors of emesis and recovery agitation with emergency department ketamine sedation: an individual-patient data meta-analysis of 8,282 children Ann Emerg Med, 2009.PMID 19501426
[8]Vargo JJ. Safety in numbers: the case for endoscopist-directed propofol sedation Endosc Int Open, 2015.PMID 26528491
[9]Miner JR, Gray R, Delavari P, et al. Alfentanil for procedural sedation in the emergency department Ann Emerg Med, 2011.PMID 20947206
[10]Aldrete JA. A postanesthetic recovery score Anesth Analg, 1970.PMID 5534693
[11]Jabre P, et al. Etomidate versus ketamine for rapid sequence intubation in acutely ill patients: a multicentre randomised controlled trial Lancet, 2009.PMID 19573904
[12]Kam PC, Cardone D Propofol infusion syndrome Anaesthesia, 2007.PMID 17567345
[13]Mirrakhimov AE, et al. Propofol infusion syndrome in adults: a clinical update Crit Care Res Pract, 2015.PMID 25954513
[14]Rahman NH, et al. The use of propofol for procedural sedation and analgesia in the emergency department: a comparison with midazolam Emerg Med J, 2011.PMID 21098799
[15]Soysal S, et al. Comparison of meperidine plus midazolam and fentanyl plus midazolam in procedural sedation: a double-blind, randomized controlled trial Adv Ther, 2004.PMID 15727400
[16]Masoumi K, et al. Dexmedetomidine versus Midazolam-Fentanyl in Procedural Analgesia Sedation for Reduction of Anterior Shoulder Dislocation: A Randomized Clinical Trial Rev Recent Clin Trials, 2019.PMID 31400271
[17]Riker RR, et al. Dexmedetomidine vs midazolam for sedation of critically ill patients: a randomized trial JAMA, 2009.PMID 19188334
[18]Pandharipande PP, et al. Effect of sedation with dexmedetomidine vs lorazepam on acute brain dysfunction in mechanically ventilated patients: the MENDS randomized controlled trial JAMA, 2007.PMID 18073360
[19]Devlin JW, et al. Clinical Practice Guidelines for the Prevention and Management of Pain, Agitation/Sedation, Delirium, Immobility, and Sleep Disruption in Adult Patients in the ICU Crit Care Med, 2018.PMID 30113379
[20]Girard TD, et al. Efficacy and safety of a paired sedation and ventilator weaning protocol for mechanically ventilated patients in intensive care (Awakening and Breathing Controlled trial): a randomised controlled trial Lancet, 2008.PMID 18191684
[21]Krauss BS, et al. Characteristics of and Predictors for Apnea and Clinical Interventions During Procedural Sedation Ann Emerg Med, 2016.PMID 27553482
[22]Zhou Y, et al. Flumazenil reversal of remimazolam-induced sedation: a narrative review of safety, pharmacokinetics, and clinical considerations Front Med, 2026.PMID 42089078