Fluid Resuscitation in Sepsis

Diagnostic Criteria

The Society of Critical Care Medicine recommends that sepsis-induced arterial hypotension be defined as hypotension despite adequate fluid resuscitation 1, 3
Tachycardia, defined as a heart rate ≥90 bpm, typically persists despite fluid administration, according to the Intensive Care Medicine guidelines 1, 2
Tachypnea, defined as a respiratory rate ≥20 bpm, continues as a marker of sepsis, as stated in the Intensive Care Medicine guidelines 1, 2
Temperature abnormalities, defined as ≤36°C or ≥38°C, are unaffected by fluid resuscitation, according to the Intensive Care Medicine guidelines 1, 2

The American College of Critical Care Medicine recommends at least 30 mL/kg of crystalloid within the first 3 hours for sepsis-induced hypoperfusion, with a strength of evidence rated as high 4
For a 70 kg patient, this equals approximately 2.1 liters, meaning 1.5 liters represents partial but not complete initial resuscitation, as noted in the Critical Care Medicine guidelines 5, 6
Some adult patients may require several liters during the first 24-48 hours to achieve adequate resuscitation, according to the Intensive Care Medicine guidelines 1, 2, 3

If hypotension recurs or persists despite adequate fluid resuscitation, the Society of Critical Care Medicine recommends initiating vasopressor therapy targeting mean arterial pressure ≥65 mmHg, with norepinephrine as first-choice agent, based on high-quality evidence 4, 5, 6
Fluid responsiveness should be assessed by ≥10% increase in blood pressure, ≥10% reduction in heart rate, and improvement in mental status, peripheral perfusion, and urine output, as stated in the Intensive Care Medicine guidelines 1, 2