Episode 25: Sepsis Isn’t Just SIRS and Recognizing Organ Dysfunction Before It Wins
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In this episode, Dr. Lance Wheeler, DVM, DACVECC tackles the syndrome that turns a sick patient into a dying one - systemic inflammation, sepsis, and multiple organ dysfunction, where the host's own response does as much damage as the infection itself. Drawing from Chapter 7 of Small Animal Critical Care Medicine (3rd edition) by Kaitlyn Rank and Bernie Hansen, and weaving in the 2024 JVECC position statement "Defining sepsis in small animals" by Cortellini et al., Lance traces how the definitions evolved from the 1991 Sepsis-1 consensus through PIRO to Sepsis-3, and builds a practical, structured framework for recognizing these patients in real time: the original definitions of infection, bacteremia, sepsis, severe sepsis, septic shock and MODS, the human 2-of-4 SIRS criteria and their canine and feline adaptations, why cats require 3 of 4 while dogs require 2 of 4, why SIRS is sensitive but badly nonspecific, and why organ dysfunction rather than inflammation is the modern center of gravity. He then moves into the bedside half, including the perfusion exam, hunting the infectious source, when to culture and when not to wait, rational antimicrobial selection, source control, and how to use SOFA, qSOFA, and APPLE scoring without letting a number replace clinical judgment. Along the way, he integrates the veterinary evidence from Hauptman and Brady through 2020-2025 work on parvovirus as a sepsis model, SIRS criteria in the emergency department, organ dysfunction and outcome in septic peritonitis, SOFA trajectory in ICU dogs, qSOFA validation, APPLEfull and APPLEfast cutoffs, and antimicrobial timing versus source control, and closes with a high-yield rapid-fire board review covering every key number worth memorizing.
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