ICU General Overview & Bundle Care Protocols

Core Framework: The ABCDEF Bundle (ICU Liberation)

A - Assess, Prevent, and Manage Pain

• Assessment tools:
  • Verbal patients: Numerical Rating Scale (NRS 0-10) - gold standard
  • Non-verbal/intubated: Behavioral Pain Scale (BPS >5 = significant pain) or Critical Care Pain Observation Tool (CPOT >3)
• Treatment:
  • Parenteral opioids are first-line for non-neuropathic pain
  • Neuropathic pain: add enteral gabapentin or carbamazepine
  • Adjuncts: acetaminophen, NSAIDs, ketamine - to reduce opioid requirements
  • "Analgesia-first" (analgosedation) approach: treat pain before adding sedatives
• Undertreated pain is a risk factor for nosocomial infections, prolonged ventilation, and delirium

B - Both SAT and SBT (Wake Up and Breathe Protocol)

• Daily interruption of sedative infusions
• Safety screen first: no active seizures, no alcohol withdrawal, no acute agitation, FiO2 < 0.70, PEEP < 10 cmH2O

• Criteria for readiness: hemodynamic stability, minimal/no vasopressors, oxygenation manageable by face mask post-extubation
• Use the Rapid Shallow Breathing Index (RSBI): respiratory rate / tidal volume (L), measured after 2 min of spontaneous breathing
  • RSBI < 105 breaths/min/L → proceed with SBT
• 60-75% of patients are successfully extubated after the first SBT
• ~15% require reintubation within 3-5 days (associated with higher mortality)
• After extubation: high-flow nasal oxygen ± NIV reduces reintubation risk, especially in obese patients
• Paired SAT + SBT improves extubation rates, reduces ICU LOS, and decreases 1-year mortality

C - Choice of Analgesia and Sedation

• Target light sedation (RASS -1 to 0) rather than deep sedation
• Deep sedation (RASS ≤ -3) is independently associated with:
  • Longer ICU and hospital stays
  • Increased delirium incidence
  • Reduced REM sleep
• Preferred sedative agents:
  • Propofol - short-acting, titratable
  • Dexmedetomidine - alpha-2 agonist, provides sedation without suppressing respiratory drive; associated with less delirium than benzodiazepines
  • Benzodiazepines (lorazepam, midazolam) - avoid as first-line; associated with more delirium and prolonged mechanical ventilation
• GABA-ergic agents (propofol, benzodiazepines) reduce REM sleep and may increase neurocognitive disorders

D - Delirium: Assess, Prevent, and Manage

• ICU delirium affects up to 80% of mechanically ventilated patients
• Assessment: Confusion Assessment Method for the ICU (CAM-ICU) or Intensive Care Delirium Screening Checklist (ICDSC) - used every shift
• Prevention (non-pharmacologic - strongly recommended):
  • Sleep hygiene protocols (minimize nocturnal interruptions, clustering of care)
  • Early and progressive mobilization
  • Reorientation, cognitive stimulation, natural light exposure
  • Minimize sedative exposure, avoid anticholinergics and benzodiazepines
• Pharmacologic treatment:
  • No drug is FDA-approved for ICU delirium prevention
  • Antipsychotics (haloperidol, quetiapine) used for symptom management but do not reduce duration
  • Melatonin: conflicting evidence; possible role in sleep-wake cycle normalization
  • Suvorexant (orexin receptor antagonist): promising for ICU insomnia; FDA-approved for primary insomnia

E - Early Mobility and Exercise

• Early progressive mobilization reduces ICU-acquired weakness (ICUAW), delirium, and ventilator days
• ICUAW diagnosis: MRC sum score < 48/60 (tests 6 bilateral muscle groups, grade 0-5 each)
• Mobilization ladder: passive range of motion → active-assisted ROM → sitting at edge of bed → standing → walking
• Contraindications screen daily: hemodynamic instability, active agitation, open wounds, high FiO2/PEEP requirements
• Even neurologically injured patients unable to follow commands should undergo daily SBT assessment
• Note: early active physiotherapy in intubated patients has not shown clear benefit; focus on mobilization as ventilation decreases

F - Family Engagement and Empowerment

• Family members serve as patient advocates and communication bridges
• Daily family updates on plan of care and goals
• ICU diaries maintained by staff/family reduce PTSD and post-ICU syndrome in survivors and families
• Shared decision-making, especially for end-of-life discussions
• Family-centered rounds: families invited to participate in bedside rounds when appropriate

Daily ICU Checklist (Standard Components)

Additional Core ICU Protocols

Ventilator-Associated Pneumonia (VAP) Bundle

• Head of bed elevation 30-45°
• Daily SAT/SBT (see B above)
• Peptic ulcer disease prophylaxis (only in high-risk patients)
• DVT prophylaxis
• Daily oral care with chlorhexidine
• Subglottic secretion drainage (in patients expected to be ventilated >48-72 hours)

CLABSI Prevention Bundle

• Full sterile barrier precautions during insertion
• Chlorhexidine skin antisepsis
• Subclavian or internal jugular site preferred (avoid femoral when possible)
• Daily assessment of continued need; remove as soon as possible
• Chlorhexidine-impregnated dressings

Glucose Control

• Target blood glucose 140-180 mg/dL in most ICU patients (NICE-SUGAR evidence)
• Tight glycemic control (80-110 mg/dL) increases hypoglycemia risk and mortality - avoid

Nutrition

• Enteral nutrition preferred over parenteral
• Start early enteral nutrition within 24-48 hours of ICU admission when hemodynamically stable
• Avoid parenteral nutrition unless enteral route is not feasible

Sepsis (Surviving Sepsis Campaign - Hour-1 Bundle)

• Measure lactate; re-measure if initial lactate >2 mmol/L
• Blood cultures before antibiotics
• Broad-spectrum antibiotics within 1 hour of recognition
• 30 mL/kg crystalloid bolus for hypotension or lactate ≥4 mmol/L
• Vasopressors (norepinephrine first-line) if fluid-refractory hypotension; target MAP ≥65 mmHg

Staffing & Quality Improvement

• High-intensity staffing (intensivist-led or co-managed models) reduces ICU LOS, ventilator days, and mortality
• Multidisciplinary rounds including pharmacist, nurses, dietician, and respiratory therapy further improve outcomes and reduce costs
• Checklists on daily rounds are a low-cost intervention independently associated with reduced mortality and ICU LOS
• Choosing Wisely principles: avoid routine daily labs/imaging without clear clinical indication; use restrictive transfusion thresholds (typically Hgb target 7-8 g/dL in stable ICU patients)

Recent Evidence (2023-2025)

• Full ABCDEF bundle compliance is associated with lower mortality, less delirium, less physical restraint use, and faster liberation from the ventilator (PMID: 38250248)
• Pediatric ICU adaptation of ABCDEF bundle is evolving, with growing evidence for personalized liberation strategies (PMID: 40172269)
• SCCM released a focused update to PADIS guidelines in 2025 - check the SCCM ICU Liberation page for the latest