Peer-reviewed by Dr. Sabrina Berdouk

Why Is This So Important?

• Intubation + mechanical ventilation are invasive, painful, and anxiety-provoking.
  • Untreated pain/anxiety → sympathetic surge (↑HR, ↑BP, ↑O₂ consumption, arrhythmias, worse outcomes).
  • Paralysis masks pain—paralytics (NMBAs) block movement, not sensation or consciousness.
  • Memories of pain are common among survivors; untreated pain is a major source of PTSD.
  • Over-sedation: delays extubation, ↑delirium, ↑mortality.
  • Under-sedation: ↑agitation, ↑energy use, self-extubation, ventilator dyssynchrony, PTSD.

Bottom line: Balance is everything—enough analgesia/sedation for comfort and safety, but not so much that you harm.

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Core Principles (How to Think at the Bedside)

1. Pain first, then sedation
   • Opioids (e.g., fentanyl) are mainstay for pain control; address pain before layering on sedatives.
2. Most sedatives do not relieve pain.
   • Propofol, dexmedetomidine, benzodiazepines—primarily sedatives.
   • Exceptions: Ketamine and dexmedetomidine also provide some analgesia.
3. Avoid benzos when possible.
   • ↑Delirium, ↑vent/ICU duration vs. non-benzo protocols.
   • Reserve for specific indications: status epilepticus, withdrawal, re-emergence phenomena.
4. Avoid long-acting paralytics.
   • Outlast induction agents; ↑risk for awake paralysis if sedation/analgesia is missed or underdosed.
5. Regularly reassess.
   • Use RASS for sedation; CPOT for pain (especially if non-verbal).
   • Reassess every 1–2 hours and after any change.
6. Minimize depth of sedation (when safe).
   • Lighter sedation (RASS −1 to −2) shortens vent/ICU time and reduces delirium.

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Recommended Approach (Step-by-Step)

1. Immediately after intubation

• Start with IV bolus opioid (e.g., fentanyl 0.5–1 mcg/kg or 50–100 mcg).
• Start a sedative (e.g., propofol, ketamine, or dexmedetomidine), titrate based on clinical context and goals.
• If paralyzed, ensure deep sedation—cannot use RASS for assessment while paralyzed!

2. Initiate infusions if ongoing mechanical ventilation

• Analgesia:
  • Fentanyl: 25–100 mcg/h (titrate to comfort; bolus as needed).
  • Hydromorphone: 0.5–3 mg/h (preferred in renal dysfunction).
  • Remifentanil: Short half-life, good for rapid titration/weaning.
  • Wean opioids when pain source resolves to prevent withdrawal/tolerance.
• Sedation:
  • Propofol: 10–30 mcg/kg/min (up to 50–100 short-term). Fast on/off, no analgesia. Beware hypotension/PRIS.
  • Dexmedetomidine: 0.2–1.5 mcg/kg/h. No resp depression; delays emergence, less delirium. Not for rapid deep sedation; avoid bolus.
  • Ketamine: 0.5–2 mg/kg/h. Hemodynamically stable, analgesic/sedative, increases BP/HR. Avoid in severe CAD, hypertension.
• Special situations:
  • Status epilepticus/withdrawal: Benzo + propofol or ketamine.
  • Severe asthma/COPD: Ketamine preferred (bronchodilation).
  • Alcohol withdrawal: Benzos, consider dexmedetomidine adjunct.

3. Ongoing Care

• Regularly assess:
  • RASS for sedation (goal 0 to −2 for most).
  • CPOT for pain (goal ≤2).
• Prevent complications:
  • Minimize sedative dose over time (“daily sedation vacation” if feasible).
  • Prevent/treat delirium (optimize sleep, reorient, mobilize, avoid benzos).
  • If using NMBA, monitor with nerve stimulator and ensure sedation.

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Common Pitfalls

• Neglecting analgesia—patients are often left in pain while sedatives are prioritized.
• Assuming paralyzed = comfortable—never true! Patients can be aware but unable to communicate.
• Excess sedation—delays extubation, ↑delirium, worsens outcomes.
• Overuse of benzos—linked to worse ICU outcomes.
• Long-acting NMBAs without ongoing sedo-analgesia—risk of awake paralysis.

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Medication Quick Reference

Class	Agent	Dose (Adult)	Pros	Cons	Comments
Opioid	Fentanyl	0.5–1 mcg/kg bolus; 25–100/h	Fast, short acting, hemo-stable	Tolerance, withdrawal	Preferred, titrate to comfort
Opioid	Hydromorphone	0.5–2 mg bolus; 0.5–3 mg/h	Longer-acting, renal safe	Slower onset
Opioid	Remifentanil	0.25–0.5 mcg/kg/min	Ultra-short, easily weaned	Cost	Safe in hepatic/renal failure
Sedative	Propofol	10–30 mcg/kg/min (adults)	Fast, amnestic, neuro-protective	Hypotension, PRIS	No analgesia
Sedative	Dexmedetomidine	0.2–1.5 mcg/kg/h	No resp depression, some analgesia	Bradycardia, hypotension	Good for weaning, delirium
Sedative/Analg.	Ketamine	0.5–2 mg/kg/h infusion	Analgesia + sedation, ↑BP/HR	Emergence, ↑ICP	Hemodynamically friendly
Benzo	Midazolam/Loraz.	1–2 mg IV PRN	Anti-epileptic, withdrawal	Delirium, slow off	Avoid if possible

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Practical Pearls

• Always order both analgesia and sedation for every intubated patient.
• Adjust doses q1–2 h, especially after initial period or when paralytics are running out.
• Target the lowest effective dose; avoid deep sedation unless specifically indicated.
• Prevent and treat ICU delirium (non-pharmacologic measures preferred).
• Don’t forget sleep—minimize nighttime interruptions; use melatonin or quetiapine only if absolutely necessary for severe insomnia/delirium.

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Summary Table: Sedation/Analgesia by Clinical Scenario

Clinical Need	First-Line	Why
Hemodynamic instability	Fentanyl + Ketamine	Maintains BP, less hypotension
Neuroprotection/Status Epil.	Propofol ± fentanyl	Reduces ICP, antiepileptic
Severe Asthma/COPD	Ketamine	Bronchodilation
Ventilator Weaning	Dexmedetomidine	Cooperative sedation, no resp depression
Withdrawal (EtOH/Benzo)	Benzos ± Dexmedetomidine	Treats withdrawal
Paralysis (NMB)	Deep analgesia + sedation	Prevent awareness/torture

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Take-Home Messages

• Pain first, then sedation—opioids are your foundation.
• Avoid deep sedation and benzos unless clearly needed.
• Never paralyze without deep sedation/analgesia.
• Regularly reassess pain, sedation, and ventilation synchrony.
• Personalize agent selection to physiology and clinical context.