Distributive shock management (septic shock)
Septic shock should be managed with rapid antimicrobial therapy, early crystalloid resuscitation, and vasopressor therapy titrated to perfusion targets. [1] The hemodynamic management targets are an initial mean arterial pressure (MAP) of 65 mm Hg and resuscitation guided by lactate when lactate is elevated. [1]
Initial resuscitation priorities
Immediate, ongoing physiologic monitoring should be performed with frequent reassessment of hemodynamics and perfusion. [2] Immediate intravenous (IV) antimicrobials should be started as soon as possible after recognition and within 1 hour for both sepsis and septic shock. [1] Initial IV crystalloid resuscitation should begin with 30 mL/kg within the first 3 hours for patients with septic shock and sepsis-induced hypoperfusion. [1]
Medication selection algorithm
Vasopressor sequence
- Thiazide-type diuretics and other antihypertensives are not part of septic shock vasoactive selection. [1]
- Norepinephrine is recommended as the first-choice vasopressor (strong recommendation). [1]
- Vasopressin (up to 0.03 U/min) or epinephrine should be added to norepinephrine when MAP remains inadequate (both are suggested add-ons). [1]
- Dobutamine is suggested for persistent hypoperfusion despite adequate fluid loading and vasopressor therapy when cardiac dysfunction is present (suggested). [1]
Corticosteroid use
- IV hydrocortisone is suggested for septic shock patients with an ongoing vasopressor requirement (weak recommendation). [1]
Key evidence supporting this recommendation
Lactate-guided resuscitation of septic shock reduced mortality compared with resuscitation without lactate monitoring (relative risk 0.67; 95% CI 0.53–0.84). [1] Norepinephrine compared with dopamine in septic shock reduced mortality (relative risk 0.89; 95% CI 0.81–0.98) and reduced arrhythmias (relative risk 0.48; 95% CI 0.40–0.58). [1]
Monotherapy versus combination therapy
Norepinephrine monotherapy is used initially for septic shock requiring vasopressors. [1] Combination vasopressor therapy is recommended as a stepwise escalation when MAP remains inadequate despite norepinephrine. [1] In patients requiring vasopressors to maintain MAP at target, inotropes should be used in addition to vasopressors when cardiac dysfunction and persistent hypoperfusion are present. [2]
Initiation thresholds and timing
Antimicrobial timing
IV antimicrobials should be started as soon as possible after recognition and within 1 hour for both sepsis and septic shock (strong recommendation). [1]
Fluid timing
Initial IV crystalloid should be administered at 30 mL/kg within the first 3 hours (strong recommendation). [1]
Target blood pressure and perfusion endpoints
An initial MAP target of 65 mm Hg is recommended for adults with septic shock requiring vasopressors (strong recommendation). [1] Resuscitation should be guided to normalize lactate in patients with elevated lactate as a marker of tissue hypoperfusion (weak recommendation). [1]
Common pitfalls to avoid
Resuscitation protocols that used CVP and ScvO2 targets have not demonstrated mortality reduction in subsequent large multicenter RCTs. [1] Antimicrobial therapy delays should be avoided because delayed and inappropriate empiric therapy are associated with worse outcomes in septic shock and are addressed in institutional quality improvement approaches. [1]
Source control and supportive care integration
Source control should be ensured as part of ongoing management and reassessment in septic shock. [2] Arterial pressure measurement with an arterial cannula should be used when noninvasive blood pressure measurement is inaccurate or when beat-to-beat analysis is needed for titration decisions. [1] Hydrocortisone should be tapered when vasopressors are no longer needed because prolonged steroid courses increase adverse metabolic effects without demonstrated benefit when vasopressor requirement resolves. [1]