General ICU Protocols - Comprehensive Overview

1. ABCDEF Bundle (ICU Liberation Bundle)

• Fishman's Pulmonary Diseases and Disorders, 2-Volume Set

2. Sedation & Analgesia Protocol

Sedation Targets - RASS Scale

Key Principles

• Analgesia-first: Treat pain before adding sedatives (pain is the most common cause of agitation in the ICU)
• Prefer propofol or dexmedetomidine over benzodiazepines (midazolam/lorazepam) - BZDs increase delirium risk
• Daily sedation interruption (Spontaneous Awakening Trial): turn off continuous sedatives every morning, reassess; this reduces ventilator days and ICU stay
• Dexmedetomidine reduces delirium incidence by ~44% in mechanically ventilated patients compared to standard sedation
• Fishman's Pulmonary Diseases and Disorders

3. Sepsis Bundle (Surviving Sepsis Campaign)

Hour-1 Bundle (complete within 1 hour)

1. Measure lactate (resuscitate if >2 mmol/L; if >4 mmol/L, aggressive resuscitation)
2. Obtain blood cultures before antibiotics
3. Administer broad-spectrum antibiotics
4. Start 30 mL/kg crystalloid IV for hypotension or lactate ≥4 mmol/L
5. Apply vasopressors if MAP <65 mmHg despite fluids - norepinephrine is first-line

Sepsis Six (UK Sepsis Trust - within 1 hour)

Ongoing ICU Sepsis Management

• MAP target: >65 mmHg
• Hydrocortisone 50 mg IV q6h (or 200 mg/day infusion) for vasopressor-dependent patients (refractory septic shock)
• Avoid starch solutions (HES) for resuscitation - increased mortality and AKI
• Reassess fluid status frequently; sustained positive fluid balance worsens outcomes
• Bailey and Love's Short Practice of Surgery, 28th Ed.; Goldman-Cecil Medicine

4. Mechanical Ventilation Protocol

Lung-Protective Ventilation (mandatory for ARDS; apply to all ICU patients)

Ventilator-Associated Pneumonia (VAP) Prevention Bundle

• Head of bed elevation: 30-45 degrees
• Oral hygiene with chlorhexidine 0.12% q6h
• Daily assessment for extubation readiness (SAT + SBT)
• Subglottic secretion drainage
• Avoid routine ventilator circuit changes
• Hand hygiene before all circuit contact
• Goldman-Cecil Medicine

5. Hemodynamic & Fluid Management

Fluid Resuscitation Principles

• Use balanced crystalloids (Lactated Ringer's, PlasmaLyte) - normal saline increases AKI risk
• In shock, give 30 mL/kg bolus then reassess with dynamic markers
• Stroke volume variation (SVV) ≥10% or pulse pressure variation ≥13% = preload responsive → give more fluid
• Passive leg raise test: augments preload by 250-500 mL; SV rise ≥10% confirms responsiveness
• After resuscitation phase: target zero or negative fluid balance - avoid fluid overload

Vasopressors (in order of preference)

1. Norepinephrine - first-line for septic shock and most distributive shock states
2. Vasopressin 0.03-0.04 U/min - add-on to reduce NE dose
3. Epinephrine - anaphylaxis; add-on for cardiogenic component
4. Dopamine - limited use; more arrhythmias than NE

Transfusion Threshold

• Hemoglobin <7 g/dL = transfuse 1 unit pRBC (restrictive strategy) in stable ICU patients
• Exception: active bleeding or acute coronary syndrome - transfuse if Hb <8-10 g/dL
• During acute shock resuscitation: target Hb >10 g/dL
• Schwartz's Principles of Surgery; Goldman-Cecil Medicine

6. Nutrition Protocol

• Goldman-Cecil Medicine, Table 88-1

7. Glycemic Control

• Target blood glucose: 140-180 mg/dL (7.8-10 mmol/L)
• Avoid hypoglycemia (glucose <70 mg/dL) - more dangerous than moderate hyperglycemia
• Do NOT target normoglycemia (80-110 mg/dL) - the NICE-SUGAR trial showed increased mortality
• Use insulin infusion protocol for mechanically ventilated or critically ill patients; convert to subcutaneous insulin once tolerating enteral feeds

8. DVT/VTE Prophylaxis

• Low-molecular-weight heparin (e.g., dalteparin 5000 U SQ daily) is preferred over UFH
• Start prophylaxis unless contraindicated (active bleeding, platelets <50k, recent surgery)
• Mechanical prophylaxis (sequential compression devices) if pharmacologic is contraindicated
• No routine IVC filter placement - not shown to improve outcomes

9. Stress Ulcer Prophylaxis

• Indicated for high-risk ICU patients: mechanical ventilation >48 h, coagulopathy, high-dose steroids, prior GI bleed
• Pantoprazole 40 mg IV once daily (or equivalent PPI)
• H2-blockers are an alternative but less effective in critically ill patients
• Discontinue when risk factors resolve or patient tolerates oral intake

10. Prevention of ICU-Acquired Infections

Central Line-Associated Bloodstream Infection (CLABSI) Bundle

1. Hand hygiene before any line manipulation
2. Full barrier precautions during insertion (gown, gloves, mask, large sterile drape)
3. Chlorhexidine skin preparation
4. Avoid femoral site when possible (subclavian or IJ preferred)
5. Daily review of line necessity - remove ASAP

Catheter-Associated UTI (CAUTI) Prevention

• Insert urinary catheters only when necessary
• Use aseptic technique
• Review daily and remove when no longer needed

11. ICU Admission Orders Summary (Example - Urosepsis + ARDS)

• Goldman-Cecil Medicine, Table 88-1

12. Post-ICU Considerations

• 50% of ICU survivors have new physical, cognitive, or psychological problems at 1 year - this is called Post-Intensive Care Syndrome (PICS)

• Residual muscle weakness can persist for 5+ years after discharge
• Early physiotherapy and rehabilitation in the ICU improves strength and ambulation at discharge
• Family members are at risk for anxiety and mood disorders; family counseling is part of comprehensive care
• ICU diaries and structured follow-up clinics reduce psychological sequelae

Recent Evidence (2024-2026)

• A 2025 systematic review (PMID 40423382) confirmed that paired SAT + SBT (the B in ABCDEF) improves weaning outcomes vs. standard care
• A 2026 meta-analysis (PMID 41780227) confirmed that care bundles significantly reduce VAP incidence in ICU patients
• A 2025 systematic review (PMID 40073767) identified that nurse education, checklists, and audit-feedback loops are the most effective strategies for CLABSI bundle adherence