Critical Care Medications Nursing Guide 2026

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ICU drips, titration protocols, sedation-analgesia-delirium management, neuromuscular blockers, insulin infusions, and the bedside knowledge every ICU nurse must have.

1. The ABCDEF Bundle (ICU Liberation)

Assess, Prevent, and Manage Pain
Both SAT (Spontaneous Awakening Trial) and SBT (Spontaneous Breathing Trial)
Choice of Analgesia and Sedation
Delirium: Assess, Prevent, and Manage
Early Mobility and Exercise
Family Engagement and Empowerment

Goal: minimize sedation depth, reduce delirium, decrease ventilator days, improve long-term outcomes.

2. Pain Assessment in the ICU

Behavioral Pain Scale (BPS) and CPOT (Critical-Care Pain Observation Tool)

CPOT Category	0 (No Pain)	1 (Moderate Pain)	2 (Severe Pain)
Facial expression	Relaxed	Tense/grimace	Grimacing/distorted
Body movements	Absence of movements/normal	Protection (slow, cautious)	Restlessness/agitation
Muscle tension (arm flex/extend)	Relaxed	Tense/rigid	Very tense/rigid
Ventilator compliance (vented)	Tolerating vent well	Coughing/alarming	Fighting ventilator
Vocalization (non-vented)	No sound	Moaning, crying	Screaming

CPOT score ≥3 = pain present → treat. Maximum score = 8. Use NRS 0–10 for patients who can self-report.

3. Analgesics

Drug	Route	Dose Range	Key Nursing Points
Fentanyl	IV infusion or bolus	Infusion: 25–200 mcg/hr; Bolus: 25–100 mcg IV q1–2h PRN	Preferred ICU opioid; less histamine release than morphine; renally safe; lipophilic — accumulates with prolonged infusion; reduce dose with liver disease
Morphine	IV bolus or infusion	2–4 mg IV q2–4h PRN or infusion	Active metabolite (morphine-6-glucuronide) accumulates in renal failure → prolonged sedation; histamine release → bronchospasm, hypotension; avoid in asthma, hemodynamically unstable
Hydromorphone (Dilaudid)	IV, PO	0.2–1 mg IV q3–4h PRN	5–10× more potent than morphine; similar to fentanyl for ICU use; renal dose adjustment needed
Ketamine	IV bolus or infusion	Analgesic dose: 0.1–0.3 mg/kg/hr infusion	Dissociative analgesic; bronchodilator (useful in asthma); maintains airway reflexes; emergence reactions (dysphoria, hallucinations) — give with low-dose benzo; INCREASES secretions (have suction ready); preserves hemodynamics
Acetaminophen	IV, PO, PR	650–1,000 mg q6h (max 4g/day; 2g/day in liver disease)	Opioid-sparing effect; non-opioid baseline analgesia; safe with renal failure

4. Sedation Agents

Richmond Agitation-Sedation Scale (RASS)

Score	Description
+4	Combative — violent, danger to staff
+3	Very agitated — pulls tubes/lines, aggressive
+2	Agitated — frequent purposeless movement, fights ventilator
+1	Restless — anxious, movements not aggressive
0	Alert and calm
-1	Drowsy — not fully alert, sustained awakening >10 sec to voice
-2	Light sedation — briefly awakens <10 sec to voice
-3	Moderate sedation — movement to voice but no eye contact
-4	Deep sedation — no response to voice, moves to physical stimulation
-5	Unarousable — no response to any stimulation

Target RASS for most ICU patients: 0 to -2 (light sedation). Deeper sedation (RASS -3 to -5) associated with worse outcomes, prolonged vent days, delirium. NMBs require RASS -4 to -5.

Sedation Drugs

Drug	Dose	Key Points
Propofol (Diprivan)	5–50 mcg/kg/min infusion	Rapid onset/offset (excellent for SATs); PROPOFOL INFUSION SYNDROME (PIS) with doses >83 mcg/kg/min >48 hr → metabolic acidosis, rhabdo, cardiac failure; monitor triglycerides (propofol in lipid emulsion = 1.1 kcal/mL); hypotension and bradycardia; do NOT use in egg/soy allergy
Midazolam (Versed)	0.02–0.1 mg/kg/hr infusion	Benzo — accumulates with prolonged infusion (active metabolite); associated with more delirium than propofol or dexmedetomidine; use short-term or for acute agitation; respiratory depression
Dexmedetomidine (Precedex)	0.2–1.5 mcg/kg/hr infusion (loading dose optional)	Alpha-2 agonist; sedation WITHOUT respiratory depression (patient breathes); arousable/cooperative (allows assessment); reduces delirium; bradycardia and hypotension; caution in patients needing deep sedation (not adequate for NMBs); rebound HTN if stopped abruptly after prolonged use
Lorazepam (Ativan)	0.01–0.1 mg/kg/hr infusion or PRN boluses	Only preferred benzo for: alcohol/benzo withdrawal; status epilepticus; use shorter durations; propylene glycol accumulation with high doses → anion gap acidosis
Ketamine	0.5–2 mg/kg/hr infusion	Anesthetic/dissociative; used for procedural sedation, refractory agitation; increases BP, HR (useful in hemodynamically unstable); increases secretions; emergence reactions

5. Neuromuscular Blocking Agents (NMBAs)

NMBAs paralyze muscles — patient is AWAKE without adequate sedation. Full sedation + analgesia REQUIRED before and during NMBAs. ALWAYS assess adequate sedation (RASS -4 to -5) before giving NMBAs. If sedation inadequate → patient is paralyzed but awake and aware = profound distress.

Drug	Type	Dose	Duration	Key Facts
Cisatracurium (Nimbex)	Non-depolarizing (Hofmann elimination)	0.1–0.2 mg/kg IV bolus; 1–3 mcg/kg/min infusion	45–75 min bolus	Preferred ICU NMBA — eliminated by plasma esterases (not organ-dependent); safe in renal/liver failure; no histamine release; use for ARDS with P/F <150
Succinylcholine (Anectine)	Depolarizing	1–1.5 mg/kg IV bolus	8–12 min	Rapid sequence intubation — fastest onset (60–90 sec); ultrashort duration; AVOID in: hyperkalemia, burns >24 hr, crush injury, spinal cord injury (massive K+ release), myopathy; phase II block if repeated doses
Rocuronium (Zemuron)	Non-depolarizing	0.6–1.2 mg/kg IV	30–60 min	RSI alternative to succinylcholine when it's contraindicated; reversed by sugammadex (Bridion) — binds and removes rocuronium; higher dose (1.2 mg/kg) → 90 sec onset (comparable to succinylcholine for RSI)
Vecuronium	Non-depolarizing	0.1 mg/kg IV; infusion 1–2 mcg/kg/min	25–40 min	Renally cleared — accumulates in renal failure; rarely used in modern ICU (cisatracurium preferred)

Train-of-Four (TOF) Monitoring

Used when NMBAs are infused continuously. Peripheral nerve stimulator delivers 4 electrical impulses to ulnar nerve; observe thumb twitches.

4/4 twitches: minimal blockade (may need more drug)
2/4 twitches: target for most uses (moderate blockade)
1/4 or 0/4: deep blockade (reduce infusion rate)
Target for ARDS protocol: 1–2 twitches (1/4–2/4)

6. Insulin Drip (ICU Glucose Management)

ICU glucose targets: 140–180 mg/dL (most guidelines); avoid <140 in critically ill (hypoglycemia → worse outcomes); intensive control targeting 80–110 mg/dL shown to increase mortality. Standard insulin infusion protocol (example):

Regular insulin 100 units in 100 mL NS = 1 unit/mL
Start at 1–2 units/hr; titrate per protocol based on hourly BG checks
Check BG q1h while on infusion; q2–4h once stable
If BG <70: hold insulin + give D50W 25 mL IV; recheck q30 min
If BG <40: give D50W 50 mL IV + hold infusion; notify provider
Transition to subcutaneous insulin when stable, tolerating enteral nutrition, and not likely to be NPO again

7. Vasopressor Nursing Safety

Vasopressor infusion safety rules:

Administer via central venous catheter (CVC) whenever possible — peripheral vasopressor extravasation causes severe tissue necrosis
If must use peripheral IV: use large vein (antecubital), monitor site q1–2h, limit to 2–4 hours maximum, dilute concentration
Extravasation of norepinephrine or phenylephrine → PHENTOLAMINE 5–10 mg in 10 mL NS injected into the area to reverse vasoconstriction
Titrate by MAP goal — never base vasopressor rate on "feel" without objective parameter
Document titration rationale in nursing notes
Wean vasopressors gradually when goal achieved — abrupt discontinuation risks profound hypotension
Confirm concentration on every shift and whenever new bag is hung

8. Spontaneous Awakening Trial (SAT) and Spontaneous Breathing Trial (SBT)

SAT-SBT paired protocol (reduces ventilator days by 3 days on average):

SAT (Spontaneous Awakening Trial):

Hold all sedation (not analgesics) every morning
Assess: patient awake, calm, following commands → pass; SBT can proceed
STOP and restart at 50% dose if: anxiety, agitation, SpO2 <88%, RR >35, HR >140 or <60, or signs of distress

SBT (Spontaneous Breathing Trial):

Prerequisite: patient passed SAT (or light sedation, RASS 0 to -2)
Method: pressure support ventilation (5–8 cm H2O PS) or T-piece for 30–120 min
Pass criteria: RR <35, SpO2 ≥88%, HR <140, MAP >60, no excessive work of breathing (accessory muscles, paradoxical breathing), patient calm
Pass SBT → consider extubation
Fail SBT → return to prior vent settings; reassess daily

NCLEX High-Yield Critical Care Medications Points

RASS target for most ICU patients: 0 to -2 (light sedation); NMBs need RASS -4 to -5
Propofol infusion syndrome: high doses (>83 mcg/kg/min) >48 hr → metabolic acidosis + rhabdomyolysis
Dexmedetomidine (Precedex): sedation without respiratory depression; patient arousable
NMBAs: always ensure adequate sedation/analgesia FIRST — paralysis without sedation = aware paralysis
Succinylcholine: avoid in hyperkalemia, burns, crush injury, SCI (causes K+ release)
NMBA reversal: sugammadex reverses rocuronium; neostigmine reverses cisatracurium/vecuronium
TOF monitoring: target 1–2/4 twitches for ARDS NMB protocol
ICU glucose target: 140–180 mg/dL (not 80–110 — intensive control increases mortality)
Vasopressor extravasation: inject phentolamine locally to reverse vasoconstriction
SAT-SBT paired protocol reduces ventilator days by approximately 3 days

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Critical Care Medications Nursing Guide 2026

1. The ABCDEF Bundle (ICU Liberation)

2. Pain Assessment in the ICU

Behavioral Pain Scale (BPS) and CPOT (Critical-Care Pain Observation Tool)

3. Analgesics

4. Sedation Agents

Richmond Agitation-Sedation Scale (RASS)

Sedation Drugs

5. Neuromuscular Blocking Agents (NMBAs)

Train-of-Four (TOF) Monitoring

6. Insulin Drip (ICU Glucose Management)

7. Vasopressor Nursing Safety

8. Spontaneous Awakening Trial (SAT) and Spontaneous Breathing Trial (SBT)

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