Procedural sedation

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Background

Definition

As defined by ACEP: Procedural sdeation is a technique of administering sedatives or dissociative agents with or without analgesics to induce a state that allows the patient to tolerate unpleasant procedures while maintaining cardiorespiratory function. [1]

Sedation Levels

Sedation levels

Level Definition Comments
Minimal Sedation Standard pain medications
Moderate Sedation Awake and able to respond to questions use in: LP, I+D
Dissociative Sedation Trance-like state, airway reflexes preserved
Deep Sedation React purposefully to painful stimuli use in: Reduction
General Anesthesia Unarousable, requires intubation/advanced airway

Checklist[2]

  • Consent in chart
  • PIV w/ fluids attached
  • ETCO2 and NC
  • Airway preparation
    • Suction with yankaeur attached
    • BVM attached to wall oxygen
    • Oral/nasal airway
    • Mac/miller blade
    • ETT with stylet placed and 10 cc syringe
  • Meds at bedside
    • Sedation Meds
    • Narcan 0.4 mg if opioid being used, not drawn up
    • Epinephrine, cardiac syringe (1:10,000) unopened and 10 cc NS Flush with needle
    • Glycopyrollate, 1 vial; not drawn up

Sedative agents

  • The ideal agent is short-acting with minimal respiratory or hemodynamic depression
  • Ketamine offers the greatest safety profile overall but caution in the elderly or patients with known cardiovascular disease due to sympathetic surge
  • Propofol is often used for orthopedic procedures due to muscle relaxation, but can cause respiratory depression and hypotension
  • Etomidate used less frequently than other agents; causes myoclonus that is undesirable for orthopedic reduction

Ketamine

  • Noncompetitive NMDA receptor antagonist that produced dissociative state
  • Sedation, analgesia, and amnesia
  • Safe to use in children undergoing procedural sedation and analgesia (Level A recommendation)[1]
  • Maintains upper airway tone, protective reflexes, and spontaneous breathing
  • Little evidence to advocate for prevention of emergence phenomenon, may pretreat with midazolam 0.05 mg/kg (2-4 mg for most adults)[3]
    • Versed can be used subsequently if emergence reaction occurs
  • Ketamine 1-2 mg/kg IV (duration 10-20 min) — Followed by 0.5-1 mg/kg IV PRN
  • Ketamine 4-5 mg/kg IM (duration 10-20 min) — Repeat 2-4 mg/kg IM after 10 min if unsuccessful
  • Ketamine 1.5-2 mg/kg IV — Safe for children (Level A)
  • Ketamine 4-5 mg/kg IM
  • Ketamine 3-6 mg/kg IN[4]

Propofol

  • Potentiates GABA receptors, sedative hypnotic agent without analgesic properties
  • Rapid onset <1 min, short duration <10 min, predictable dose dependent potency
  • Propofol 0.5-1 mg/kg IV over 3-5 min IV (onset <1 min, duration <10 min) — Repeat 0.5 mg/kg q3-5 min PRN
  • Can cause dose-related respiratory depression, hypotension, and decreased cardiac output, however, rarely leads to unplanned intubation, prolonged observation, or complications requiring admission [5]

Fentanyl/Midazolam

Fentanyl/Etomidate

  • Similar to fentanyl/midazolam, but better because shorter duration of action
  • An alternative to propofol for brief sedation (e.g. shoulder/hip reduction, cardioversion)
  • Can cause myoclonus[6]
  • Fentanyl 0.5-1 mcg/kg IV — Dose fentanyl first
  • Etomidate 0.15 mg/kg IV (duration 6 min) — Average 8-10 mg

Brevital (Methohexital)/Fentanyl

  • Suppresses the reticular activating center in the brainstem and cerebral cortex, thereby causing sedation
  • Sedation and amnesia, no analgesia
  • Fentanyl 0.5-1 mcg/kg IV — Dose fentanyl first
  • Brevital 0.75-1 mg/kg IV (onset immediate, duration <10 min) — Repeat 0.5 mg/kg IV q2 min PRN

Propofol/Ketamine (Ketofol)

  • 1:1 mixture of ketamine and propofol[7]
  • Safe in children and adults undergoing procedural sedation and anesthesia (Level B Recommendation)[1]
  • Theorized that side-effect profiles counter one another
    • Propofol-associated hypotension and respiratory depression can theoretically be reduced with increases in circulatory norepinephrine induced by ketamine
    • Ketamine associated nausea and emergence reactions are theoretically reduced by the antiemetic and anxiolytic properties of propofol
  • A study of pediatric patients found the total patient sedation times to be shorter (3 minutes) with the combined ketamine and propofol regimen compared with ketamine alone[8]
  • Ketofol 0.5 mg/kg propofol + 0.5 mg/kg ketamine IV — May be mixed in same syringe or given separately

Dexmedetomidine

  • Dexmedetomidine 1 mcg/kg loading then 0.2-1 mcg/kg/hr IV — Avoid in heart blocks; may supplement with midazolam 1-2 mg
  • Side effects include bradycardia and hypotension

Etomidate

  • Etomidate 0.1-0.2 mg/kg IV — One-time dosing; max 10 mg

Side Effects

  • Desaturation
    • Stimulate
      • Try pressure behind ear
    • Jaw thrust
    • Nasal airway
    • BVM (just 10 breaths/min) count to 5 between breaths
    • NIV
    • LMA
    • Intubation

See Also

References

  1. ↑ 1.0 1.1 1.2 ACEP Clinical Policy: Procedural Sedation and Analgesia in the Emergency Department full text
  2. ↑ http://emcrit.org/wp-content/uploads/Sedation_Checklist-8-1-10.pdf
  3. ↑ Sener S, Eken C, Schultz CH, Serinken M, Ozsarac M. Ketamine with and without midazolam for emergency department sedation in adults: a randomized controlled trial. Ann Emerg Med. 2011 Feb;57(2):109-114.e2
  4. ↑ Hall, D, et al. Intranasal ketamine for procedural sedation. Emerg Med J. 2014; 31:789-90.
  5. ↑ Blackburn 2000, Burnton JH, Miner JR, et al. Propofol for emergency department procedural sedation and analgesia: a tale of three centers. Acad Emerg Med. 2006;13(1):24-30
  6. ↑ Van Keulen SG, Burton JH. Myoclonus associated with etomidate for ED procedural sedation and analgesia. Am J Emerg Med. 2003;21:556-558.
  7. ↑ Andolfatto G, Abu-Laban RB, Zed PJ, et al. Ketamine-propofol combination (ketofol) versus propofol alone for emergency department procedural sedation and analgesia: a randomized double-blind trial. Ann Emerg Med. 2012; 59(6): 504-12.e1-2. PMID: 22401952
  8. ↑ Shah A, Mosdossy G, McLeod S, et al. A blinded, randomized controlled trial to evaluate ketamine/propofol versus ketamine alone for procedural sedation in children. Ann Emerg Med. 2011;57:425-433.
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