First‑Line Management of Adult Sepsis

Antimicrobial Therapy

Administer intravenous broad‑spectrum antibiotics within the first hour of sepsis recognition; each hour of delay reduces survival by ~7 %【@1】.
Obtain at least two sets of blood cultures before antibiotics, but never postpone antimicrobial delivery beyond 45 minutes to obtain cultures【@1】.
Provide empiric coverage for gram‑positive organisms (including MRSA when risk factors are present), gram‑negative bacteria (including Pseudomonas in healthcare‑associated infections), and anaerobes for intra‑abdominal or aspiration sources【@1】.
Add empiric antifungal therapy (e.g., an echinocandin) for patients with immunosuppression, prolonged ICU stay, total parenteral nutrition, or recent broad‑spectrum antibiotic exposure【@1】.

Give a minimum of 30 mL/kg of isotonic crystalloid (normal saline or balanced solution) within the first three hours of sepsis onset【@3】.
Use isotonic crystalloids as the first‑line fluid; they are inexpensive, well‑tolerated, and have efficacy comparable to colloids【@4】.
Continue fluid administration while hemodynamic improvement is observed, guided by dynamic indices (e.g., pulse‑pressure variation, stroke‑volume variation) or static variables such as arterial pressure, heart rate, and urine output【@4】.

Aim for a mean arterial pressure (MAP) ≥ 65 mmHg in most adults; for patients with chronic hypertension, target MAP 70–85 mmHg because of a right‑shifted autoregulatory curve【@5】.
Maintain urine output ≥ 0.5 mL/kg/h as a bedside marker of adequate renal perfusion【@3】.
Target central venous pressure (CVP) 8–12 mmHg (or 12–15 mmHg if mechanically ventilated) to assess fluid responsiveness【@3】.
Achieve central venous oxygen saturation (ScvO₂) ≥ 70 % (or mixed venous O₂ saturation ≥ 65 %) to confirm sufficient tissue oxygen delivery【@3】.
Monitor additional perfusion markers: capillary refill < 2 seconds, warm extremities, normal mental status, and palpable peripheral pulses【@4】.

Initiate norepinephrine as the first‑line vasopressor at 0.05–0.1 µg/kg/min when MAP remains < 65 mmHg after the initial 30 mL/kg fluid bolus【@5】.
Add vasopressin 0.03 U/min to norepinephrine when further MAP support is required or to reduce norepinephrine dose; vasopressin should not be used as the sole initial vasopressor【@3】.
Introduce epinephrine as a third‑line agent if MAP targets are still unmet despite norepinephrine plus vasopressin【@3】.
Use dobutamine 2.5–5 µg/kg/min when myocardial dysfunction or persistent tissue hypoperfusion (“cold shock”) is evident despite adequate MAP and volume status【@3】.

Obtain a baseline serum lactate measurement at the time of sepsis recognition【@1】.
If the initial lactate is ≥ 2 mmol/L, repeat the measurement within six hours and use lactate normalization as a resuscitation endpoint【@1】.

Identify or exclude a specific anatomic infection source requiring emergent intervention within 12 hours of sepsis onset (e.g., abscess, infected device, bowel perforation)【@5】.
Perform definitive source‑control procedures (drainage, debridement, removal of infected devices) as soon as feasible; inadequate source control is independently associated with increased mortality【@5】.
Whenever possible, obtain fluid or tissue samples from the suspected infection site for Gram stain, culture, and susceptibility testing【@4】.

Provide supplemental oxygen to achieve SpO₂ ≥ 90 %; if pulse‑oximetry is unavailable, administer oxygen empirically【@4】.
Position patients semi‑recumbently with the head of bed elevated 30–45° to reduce aspiration risk and ventilator‑associated pneumonia【@4】.
Consider non‑invasive ventilation for patients with dyspnea or persistent hypoxemia when staff are adequately trained【@4】.
If invasive mechanical ventilation is required, use a tidal volume of 6 mL/kg predicted body weight and keep plateau pressures ≤ 30 cm H₂O to minimize ventilator‑induced lung injury【@3】.

Reassess antimicrobial therapy daily once pathogen identification and susceptibility results are available, typically within 48–72 hours【@5】.
De‑escalate to the most appropriate single agent within 3–5 days based on culture data and clinical improvement; de‑escalation is a protective factor for mortality【@5】.
Plan a total antibiotic course of 7–10 days for most serious infections associated with sepsis【@1】.

Do not use routine intravenous hydrocortisone in septic shock patients who achieve hemodynamic stability with fluids and vasopressors【@3】.
Consider hydrocortisone 200 mg/day (e.g., 50 mg IV every 6 hours) only if hemodynamic stability cannot be attained despite adequate fluid resuscitation and vasopressor therapy【@4】.
Taper hydrocortisone when vasopressors are no longer required【@3】.

Target hemoglobin 7–9 g/dL unless there is tissue hypoperfusion, ischemic coronary disease, or acute hemorrhage【@3】.
Transfuse red blood cells only when hemoglobin falls below 7 g/dL【@3】.

Provide pharmacologic deep‑vein thrombosis prophylaxis unless contraindicated【@1】.
Use stress‑ulcer prophylaxis (H₂‑blocker or proton‑pump inhibitor) in patients with bleeding risk factors【@1】.

Delaying antimicrobial administration beyond 1 hour directly increases mortality【@1】.
Providing less than the recommended 30 mL/kg initial fluid bolus is inadequate; many patients require additional fluids【@1】.
Failing to initiate vasopressors when MAP remains < 65 mmHg after adequate fluid resuscitation prolongs tissue hypoperfusion and worsens outcomes【@1】.
Relying solely on MAP without monitoring lactate, urine output, mental status, and skin perfusion can miss ongoing hypoperfusion【@1】.
Using dopamine as a first‑line vasopressor is associated with more arrhythmias and worse outcomes compared with norepinephrine【@5】.
Excessive fluid administration when vasopressor support is already required increases the risk of fluid overload, especially in patients with abdominal pathology or ARDS【@1】.
Attempting extubation while the patient remains on vasopressors is an absolute contraindication【@6】.