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Artwork for STAT Stitch Deep Dive Podcast Beyond The Bedside
STAT Stitch Deep Dive Podcast Beyond The Bedside · August 27 · 22 min

CC Pharm | Propofol

Clinical Action & Pharmacokinetics Mechanism: Propofol is an IV anesthetic/sedative that enhances GABAA currents by slowing deactivation and reducing receptor desensitization. It also inhibits NMDA glutamate receptors, depressing excitatory transmission, and exerts antiemetic effects by reducing serotonin in the area postrema. Pharmacokinetics: Follows a 3-compartment linear model. Onset is rapid (~40s) via quick blood-brain equilibration. Clearance is 23–50 mL/kg/min via hepatic conjugation to inactive metabolites excreted by kidneys. Distribution accounts for 50% of plasma decline. Infusions over 10 days accumulate in fat, extending terminal half-life to 1–3 days and delaying recovery. Critical Administration & Dosing Rules Safe Handling: It is a single-use product; maintain strict aseptic technique. Discard unused propofol or tubing within 12 hours of opening, or within 6 hours if mixed with lidocaine. Do not administer Fresenius Propoven via a microbiological filter. Induction Dosing (IV): Healthy Adults (18–64): 2 to 2.5 mg/kg IV titrated to response. Geriatric/Debilitated/ASA III/IV: 1 to 1.5 mg/kg IV. Pediatric (3–16): 2.5 to 3.5 mg/kg IV. Maintenance & ICU Sedation: Anesthesia Maintenance: 50 to 100 mcg/kg/min continuous IV infusion after a 150–200 mcg/kg/min loading phase. ICU Sedation (Ventilated Adults): Start at 5 mcg/kg/min; titrate by 5–10 mcg/kg/min every 5–10 minutes (usual range: 5–50 mcg/kg/min). Do not exceed 4 mg/kg/hour unless benefits outweigh risks. Discontinuation: Avoid abrupt withdrawal to prevent rapid awakening, anxiety, and ventilator resistance; maintain light sedation until 10–15 minutes before extubation. Pain Reduction: Administer via larger veins, or add IV lidocaine (up to 20 mg per 200 mg propofol) immediately before injection. Major Safety Warnings & Complications Provider Requirements: Administer only by clinicians trained in general anesthesia or critical care, with immediate access to airway, ventilation, and resuscitation equipment. Lock/manage inventory to prevent diversion. Adverse Reactions: Cardiovascular & Respiratory: Hypotension is highly common (3% to 26%). Other risks include bradycardia (1% to 3%), apnea (1% to 3%), respiratory depression, hypoxia, and pulmonary edema. PRIS: Prolonged, high-dose infusions for ICU sedation are associated with Propofol-Related Infusion Syndrome (PRIS), causing fatal metabolic derangements and organ failure. EUA Warning: Fresenius Propoven 2% is double the strength (20 mg/mL) of standard FDA-approved 1% (10 mg/mL). Exercise extreme caution with pump settings to prevent overdose.

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Clinical Action & Pharmacokinetics

  • Mechanism: Propofol is an IV anesthetic/sedative that enhances GABAA currents by slowing deactivation and reducing receptor desensitization. It also inhibits NMDA glutamate receptors, depressing excitatory transmission, and exerts antiemetic effects by reducing serotonin in the area postrema.
  • Pharmacokinetics: Follows a 3-compartment linear model. Onset is rapid (~40s) via quick blood-brain equilibration. Clearance is 23–50 mL/kg/min via hepatic conjugation to inactive metabolites excreted by kidneys. Distribution accounts for 50% of plasma decline. Infusions over 10 days accumulate in fat, extending terminal half-life to 1–3 days and delaying recovery.

Critical Administration & Dosing Rules

  • Safe Handling: It is a single-use product; maintain strict aseptic technique. Discard unused propofol or tubing within 12 hours of opening, or within 6 hours if mixed with lidocaine. Do not administer Fresenius Propoven via a microbiological filter.
  • Induction Dosing (IV):
    • Healthy Adults (18–64): 2 to 2.5 mg/kg IV titrated to response.
    • Geriatric/Debilitated/ASA III/IV: 1 to 1.5 mg/kg IV.
    • Pediatric (3–16): 2.5 to 3.5 mg/kg IV.
  • Maintenance & ICU Sedation:
    • Anesthesia Maintenance: 50 to 100 mcg/kg/min continuous IV infusion after a 150–200 mcg/kg/min loading phase.
    • ICU Sedation (Ventilated Adults): Start at 5 mcg/kg/min; titrate by 5–10 mcg/kg/min every 5–10 minutes (usual range: 5–50 mcg/kg/min). Do not exceed 4 mg/kg/hour unless benefits outweigh risks.
    • Discontinuation: Avoid abrupt withdrawal to prevent rapid awakening, anxiety, and ventilator resistance; maintain light sedation until 10–15 minutes before extubation.
  • Pain Reduction: Administer via larger veins, or add IV lidocaine (up to 20 mg per 200 mg propofol) immediately before injection.

Major Safety Warnings & Complications

  • Provider Requirements: Administer only by clinicians trained in general anesthesia or critical care, with immediate access to airway, ventilation, and resuscitation equipment. Lock/manage inventory to prevent diversion.
  • Adverse Reactions:
    • Cardiovascular & Respiratory: Hypotension is highly common (3% to 26%). Other risks include bradycardia (1% to 3%), apnea (1% to 3%), respiratory depression, hypoxia, and pulmonary edema.
    • PRIS: Prolonged, high-dose infusions for ICU sedation are associated with Propofol-Related Infusion Syndrome (PRIS), causing fatal metabolic derangements and organ failure.
    • EUA Warning: Fresenius Propoven 2% is double the strength (20 mg/mL) of standard FDA-approved 1% (10 mg/mL). Exercise extreme caution with pump settings to prevent overdose.

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