5. Terminologies Term Definition Infection Identifiable source of microbial insult SIRS Two or more following criteria: - Temp >/= 38C or </= 36C - Heart rate >/= 90 beats/min - Respiratory rate >/= 20 breaths/min or PaCO2 </= 32mmHg or mechanical ventilation - WBC >/= 12,000/ul or </= 4000/ul or >/= 10% band forms Sepsis Identifiable source of infection + SIRS Severe sepsis Sepsis + organ dysfunction Septic shock Sepsis + cardiovascular collapse (requiring vasopressor support)