Create a management protocol for sepsis in the ICU

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ICU Sepsis Management Protocol

Based on the 2021 Surviving Sepsis Campaign (SSC) Guidelines, Sepsis-3 definitions, and current ICU evidence. Sources: Harrison's Principles of Internal Medicine 22E (2025), Goldman-Cecil Medicine, Barash's Clinical Anesthesia 9E, Fischer's Mastery of Surgery 8E.

1. Definitions (Sepsis-3)

Term	Definition
Sepsis	Life-threatening organ dysfunction caused by a dysregulated host response to infection. SOFA score increase ≥2 from baseline in a patient with suspected/confirmed infection.
Septic Shock	Sepsis + persistent hypotension requiring vasopressors to maintain MAP ≥65 mmHg AND serum lactate >2 mmol/L despite adequate fluid resuscitation.
qSOFA (screening)	≥2 of: RR ≥22/min, GCS <15, SBP ≤100 mmHg. Positive score warrants further SOFA evaluation.

2. Recognition and Initial Screening

Apply qSOFA at triage; confirm with full SOFA score in suspected cases
Obtain serum lactate immediately - lactate >2 mmol/L is a high-risk marker; lactate >4 mmol/L indicates cryptic shock even without hypotension
Other early warning scores (NEWS, MEWS) are acceptable screening tools; none is exclusively preferred by SSC guidelines
Target ICU admission within 6 hours of diagnosis for critically ill or shocked patients

3. The 1-Hour Bundle (SSC 2018 Update)

All five elements should be initiated within 1 hour of sepsis recognition (time zero):

Step	Action
1. Measure lactate	Obtain baseline lactate. Recheck in 2-4 hours if initial level >2 mmol/L.
2. Blood cultures	Obtain ≥2 sets (aerobic + anaerobic) BEFORE antibiotics.
3. Broad-spectrum antibiotics	Administer within 1 hour of septic shock recognition; within 3 hours if sepsis without shock.
4. IV fluids	30 mL/kg IV crystalloid if hypotensive or lactate ≥4 mmol/L, given over the first 3 hours.
5. Vasopressors	Start if MAP <65 mmHg despite fluid resuscitation (may initiate concurrently with fluids).

4. Fluid Resuscitation

Initial resuscitation:

30 mL/kg IV crystalloid in the first 3 hours
Preferred fluid: balanced crystalloids (e.g., lactated Ringer's) - associated with lower rates of AKI, less need for renal replacement therapy, and fewer deaths vs. normal saline in most data
After initial bolus, further fluid challenges should be guided by dynamic assessment of fluid responsiveness (pulse pressure variation, stroke volume variation, passive leg raise test)

Ongoing monitoring targets:

MAP ≥65 mmHg (target 65-70 mmHg is equivalent to 80-85 mmHg in most patients)
Urine output >0.5 mL/kg/hour
Lactate clearance ≥10% OR central venous O₂ saturation >70%
CVP 8-12 mmHg in mechanically ventilated patients requiring vasopressors

Avoid:

Hetastarch (hydroxyethyl starch) - contraindicated in septic shock
Excessive fluid resuscitation - prolonged positive fluid balance is independently associated with increased mortality
Albumin: no clear superiority over crystalloid; may be considered when large volumes of crystalloid are required (weak recommendation)

5. Antimicrobial Therapy

Timing:

Septic shock: empiric antibiotics within 1 hour - every 1-hour delay in appropriate antibiotic administration is associated with ~7-8% increase in mortality
Sepsis without shock: if an alternative diagnosis cannot be excluded, administer empiric antibiotics within 3 hours

Selection principles:

Consider: site of infection, community vs. healthcare exposure, prior infections and antibiotic use, local resistance profiles, immune status, comorbidities, illness severity

Empiric antibiotic framework:

Scenario	Recommended Agents
Undifferentiated sepsis, no Pseudomonas risk	Ceftriaxone or cefotaxime (gram-negative coverage) + consider vancomycin if MRSA risk
Undifferentiated sepsis, Pseudomonas risk	Cefepime, piperacillin-tazobactam, or meropenem/imipenem
High resistance risk (prior MDR colonization)	Two empiric gram-negative antibiotics
Community-acquired pneumonia	Beta-lactam + macrolide or respiratory fluoroquinolone
Intra-abdominal source	Piperacillin-tazobactam or carbapenem (anaerobic coverage required)
Urinary source	Ceftriaxone (adjust based on local susceptibilities)
MRSA suspected	Add vancomycin or linezolid
Fungal sepsis risk	Add echinocandin (anidulafungin, caspofungin, or micafungin)

De-escalation (antibiotic stewardship):

Reassess antibiotic appropriateness daily once microbiologic data are available
Narrow spectrum when organism and sensitivities are known
Procalcitonin: do not use to decide when to start antibiotics; may be used to guide discontinuation of therapy
Aim for shorter rather than longer courses; most uncomplicated bacteremic sepsis does not require >7 days

6. Source Control

All patients with sepsis require a thorough search for the infectious source
Perform source control procedure (drainage, debridement, removal of infected device) as soon as feasible - without source control, antibiotic therapy is substantially less effective
Obtain imaging studies promptly (CT, ultrasound) to identify drainable collections or anatomic source
Remove intravascular catheters if they are the suspected source; place new access at a different site

7. Vasopressor Therapy

Goal: Maintain MAP ≥65 mmHg

Vasopressor ladder:

Priority	Agent	Dose	Notes
1st line	Norepinephrine	1-50 μg/min (or 0.01-0.5 μg/kg/min)	Preferred for all distributive/septic shock; lower arrhythmia risk vs. dopamine
2nd line	Vasopressin	Up to 0.03-0.04 U/min (fixed dose)	Add when norepinephrine dose reaches 0.25-0.5 μg/kg/min OR as adjunct to reduce norepinephrine dose; do NOT use as sole agent
3rd line	Epinephrine	1-30 μg/min	Add when hypotension persists despite norepinephrine + vasopressin
Low cardiac output	Dobutamine	2-20 μg/kg/min	Add to norepinephrine (or switch to epinephrine alone) in low CO state despite adequate resuscitation

Avoid:

Dopamine as first-line (higher arrhythmia risk; no proven renal protection)
Levosimendan and terlipressin (not recommended by SSC)
Targeting supranormal oxygen delivery values

Monitoring:

Insert arterial line for continuous BP monitoring in patients on vasopressors
Central venous catheter for vasopressor infusion and CVP monitoring
Echocardiography to assess myocardial function and guide fluid/vasopressor strategy
PAC (pulmonary artery catheter): not routinely recommended for ALI/ARDS; consider in mixed septic-cardiogenic shock

8. Corticosteroids

Indication: Refractory septic shock (ongoing vasopressor requirement despite adequate fluid resuscitation)

Dose: Hydrocortisone 200 mg/day IV (continuous infusion preferred, or 50 mg q6h)

Rationale: Relative adrenal insufficiency and vasopressin receptor downregulation are common in septic shock; low-dose hydrocortisone is not indicated if hemodynamic stability can be restored with fluids and vasopressors alone

Duration: Continue until vasopressors are no longer required, then taper

Notes:

Do NOT use ACTH stimulation test to guide corticosteroid use in septic shock
Patients on chronic steroids should receive stress-dose coverage regardless of hemodynamic status

9. Respiratory Support and Mechanical Ventilation

Non-intubated patients:

Supplemental O₂ to maintain SpO₂ 90-96%
High-flow nasal cannula (HFNC) preferred over standard O₂ in patients with adequate neurologic status and early respiratory failure
Do not trial non-invasive ventilation (NIV/BiPAP) in patients in shock - it does not provide airway protection and is less effective than invasive MV at reducing work of breathing

Intubation indications: Significant respiratory distress, severe hypotension, severe acidosis, depressed consciousness, inability to protect airway

Lung-protective ventilation strategy (if mechanically ventilated):

Parameter	Target
Tidal volume	6 mL/kg ideal body weight (IBW)
Plateau pressure	≤30 cmH₂O
Driving pressure	Minimize (<15 cmH₂O preferred)
PEEP	Apply adequate PEEP (titrate to FiO₂/PEEP tables); avoid derecruitment
SpO₂ target	90-96%
Head of bed	30-45° elevation (semi-recumbent) - reduces VAP risk

Sepsis-induced ARDS:

Moderate-to-severe ARDS (PaO₂/FiO₂ <150): prone positioning for ≥12 hours/day
Neuromuscular blockade: use to facilitate prone positioning; intermittent bolus dosing preferred over continuous infusion
Severe ARDS refractory to MV: consider VV-ECMO if experienced center and resources available
Avoid pulmonary artery catheter routinely in ALI

Weaning:

Use protocol-driven ventilator weaning with spontaneous breathing trials
Daily sedation interruption if continuous infusion sedation is used
Target lightest effective sedation (RASS 0 to -2)

10. Organ-Specific Management

Renal

Maintain renal perfusion (MAP ≥65 mmHg, adequate CO)
Avoid nephrotoxic agents (NSAIDs, contrast, aminoglycosides) where possible
Renal replacement therapy (CRRT or IHD): indicated for refractory hyperkalemia, severe acidosis (pH <7.2 in AKI setting), fluid overload refractory to diuretics, uremia
Bicarbonate therapy: consider to correct arterial pH <7.2 in the setting of AKI

Hematologic

Transfusion threshold: Hemoglobin 7-9 g/dL in the absence of tissue hypoperfusion, active coronary artery disease, or acute hemorrhage
FFP: not indicated for correction of coagulopathy unless active bleeding or planned invasive procedure
Platelet transfusion threshold: <10,000/μL (prophylactic); <20,000/μL if significant bleeding risk; <50,000/μL for active bleeding or procedures

Glycemic Control

Target blood glucose 140-180 mg/dL (7.7-10 mmol/L)
Avoid tight glycemic control (target <110 mg/dL) - associated with hypoglycemia and increased mortality in the NICE-SUGAR trial
Use insulin infusion protocols with frequent glucose monitoring (every 1-2 hours during titration)

Nutrition

Initiate early enteral nutrition within 24-48 hours of ICU admission if hemodynamically stable and gut is accessible
Avoid parenteral nutrition in the first 7 days unless enteral route is truly unavailable
Avoid caloric overfeeding; target 20-25 kcal/kg/day in the acute phase

Neurologic

Sepsis-associated encephalopathy occurs in >50% of septic patients - recognize early
Limit unnecessary sedatives and neurotoxic agents
Correct metabolic and electrolyte abnormalities
EEG for suspected seizures; brain imaging (CT/MRI) for focal deficits or stroke; LP for suspected meningoencephalitis

11. Sedation and Analgesia (PADIS Bundle)

Consistent with the 2025 updated PADIS guidelines:

Domain	Recommendation
Pain	Assess regularly with NRS or CPOT; treat pain before sedation
Sedation	Prefer light sedation (RASS 0 to -2); propofol or dexmedetomidine preferred over benzodiazepines in most mechanically ventilated patients
Delirium	Assess with CAM-ICU or ICDSC daily; minimize risk factors (immobility, sleep deprivation, anticholinergics); antipsychotics not routinely recommended for prevention
Immobility	Early progressive mobilization as soon as hemodynamically feasible
Sleep	Minimize nocturnal interruptions; non-pharmacologic sleep hygiene

12. DVT and Stress Ulcer Prophylaxis

DVT prophylaxis: Low-molecular-weight heparin (preferred) or unfractionated heparin SC; mechanical compression if anticoagulation contraindicated
Stress ulcer prophylaxis: PPIs or H2 blockers in patients with high-risk factors (MV >48h, coagulopathy, prior GI ulcer/bleeding, NSAID use, high-dose steroids, shock)

13. Monitoring and Reassessment

Parameter	Target / Frequency
Arterial BP	Continuous via arterial line if on vasopressors
Lactate	Every 2-4 hours until normalized; clearance ≥10% indicates adequate resuscitation
Urine output	Hourly; target >0.5 mL/kg/hr
Blood glucose	Every 1-2 hours during insulin infusion
Blood cultures	At least 2 sets before antibiotics; repeat if fever persists
Procalcitonin	Serial to guide antibiotic discontinuation
SOFA score	Daily to track organ dysfunction trajectory
Echocardiogram	At admission to assess EF, volume status, RV function

14. Goals of Care

Discuss prognosis and goals of care with the patient (when capable) and family early and repeatedly
Integrate palliative care principles alongside active ICU management
Document code status and advance directives

Quick Reference Summary

HOUR 1 BUNDLE:
 Lactate → Cultures → Broad-spectrum Abx → 30 mL/kg IVF → Vasopressor if MAP <65

VASOPRESSORS: Norepinephrine → + Vasopressin → + Epinephrine
              Add Dobutamine for low CO

FLUID: Balanced crystalloid; NO hetastarch; reassess fluid responsiveness after bolus

ANTIBIOTICS: Broad-spectrum → de-escalate when cultures return → procalcitonin to stop

STEROIDS: Hydrocortisone 200 mg/day ONLY if refractory shock on vasopressors

MV: 6 mL/kg TVol, Pplat ≤30, PEEP titrated, HOB 30-45°, prone if P/F <150

GLYCEMIA: 140-180 mg/dL (NOT tight control)

TRANSFUSION: Hgb 7-9 g/dL threshold

ICU ADMIT: Within 6 hours of diagnosis

Key References

Harrison's Principles of Internal Medicine, 22E (2025), Chapter 315 - Sepsis
Goldman-Cecil Medicine, Chapter 92 - Circulatory Therapy
Barash's Clinical Anesthesia, 9E, Table 57-4 - Management of Sepsis and Septic Shock
Fischer's Mastery of Surgery, 8E - Management of Sepsis
Surviving Sepsis Campaign 2021 International Guidelines (Evans et al., Intensive Care Med 2021)
S3 Guideline on Sepsis Prevention, Diagnosis, Therapy and Follow-up - Update 2025 [PMID: 40824313]
ESICM Guidelines on Circulatory Shock and Hemodynamic Monitoring 2025 [PMID: 41236566]
2025 PADIS Guidelines Update - Sedation/Analgesia/Delirium/Immobility/Sleep [PMID: 39982143]

Disclaimer: This protocol is for educational reference. Clinical decisions must be individualized to each patient's context, local microbiology, institutional resources, and most current guidelines. Always consult institutional protocols and current guideline updates.

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