Another unacceptable model of primate septic shock

Area of Science:

• Veterinary Medicine
• Primate Research
• Infectious Disease Modeling

Background:

• Septic shock models are crucial for understanding and treating this life-threatening condition.
• Existing canine models for septic shock have shown success, but a primate model is lacking.
• Rhesus monkeys were chosen to adapt a successful canine septic shock model.

Purpose of the Study:

• To adapt a canine septic shock model to Rhesus monkeys.
• To evaluate the Rhesus monkey as a model for septic shock.
• To investigate the physiological responses of Rhesus monkeys to bacterial challenge.

Main Methods:

• Rhesus monkeys underwent gallbladder artery and duct ligation and division.
• Escherichia coli (E. coli) was injected into the gallbladder at varying doses.
• Hemodynamic parameters, blood cultures, and survival rates were monitored.
• Autopsies were performed to assess for peritonitis and abscess formation.

Main Results:

• Rhesus monkeys exhibited extreme sensitivity to E. coli, with rapid mortality.
• A hypodynamic circulatory state, not hyperdynamic, was observed.
• Bacteremia and death occurred before the development of intraabdominal abscess or peritonitis.
• Even without bacterial challenge, ligation alone led to bacteremia and death.

Conclusions:

• The Rhesus monkey is an inadequate model for septic shock due to hypersensitivity.
• The model fails to reproduce the typical hyperdynamic state of septic shock.
• The rapid onset of hypodynamic shock and mortality prevents the development of key pathological features like abscesses.