Cardiac contractility during hemofiltration in an awake model of hyperdynamic endotoxemia

Area of Science:

• Critical Care Medicine
• Cardiovascular Physiology
• Renal Replacement Therapy

Background:

• Hyperdynamic endotoxemia in swine models human sepsis.
• Endotoxemia causes hemodynamic instability and left ventricular (LV) dysfunction.
• Circulating plasma mediators contribute to sepsis-induced myocardial depression.

Purpose of the Study:

• To investigate if continuous veno-venous hemofiltration (CVVH) can mitigate hemodynamic instability and LV dysfunction.
• To assess the effect of CVVH on circulating plasma mediators in endotoxemia.
• To evaluate LV contractility using LV end-systolic elastance (Ees) as an index.

Main Methods:

• Nineteen swine were randomly assigned to control (CTRL), hemofiltration (HF), or extracorporeal circuit (ECC) groups.
• All animals received intravenous E. coli endotoxin and resuscitation for 24 hours.
• CVVH was initiated 30 minutes after endotoxin infusion.

Main Results:

• LV end-systolic elastance (Ees), an index of contractility, was preserved in the HF group but decreased in CTRL and ECC groups.
• Cardiac output was significantly higher in the HF group compared to the CTRL group.
• Plasma catecholamine levels did not differ significantly between groups.

Conclusions:

• Continuous veno-venous hemofiltration effectively prevented left ventricular (LV) impairment during experimental endotoxemia.
• CVVH may be a beneficial intervention for managing sepsis-induced cardiac dysfunction.
• Reducing circulating mediators via hemofiltration may preserve myocardial function.