Large-pore hemodialysis in acute endotoxin shock

Area of Science:

• Cardiovascular Physiology
• Renal Replacement Therapy
• Critical Care Medicine

Background:

• Acute endotoxin shock significantly impairs cardiac function and myocardial mechanical efficiency.
• Conventional treatments may not fully restore cardiac performance during severe sepsis.
• Exploring novel therapeutic strategies like hemodialysis is crucial for managing endotoxin-induced cardiac dysfunction.

Purpose of the Study:

• To investigate the efficacy of large-pore membrane hemodialysis in improving cardiac function during acute endotoxin shock.
• To compare the effects of hemodialysis with dopamine treatment on myocardial contractility and efficiency.

Main Methods:

• A large animal laboratory model using mongrel dogs subjected to induced endotoxin shock.
• Instrumentation to measure left ventricular elastance, cardiac output, and myocardial mechanical efficiency.
• Comparison of venovenous hemodialysis with a large-pore polysulfone filter against sham procedures and dopamine treatment.

Main Results:

• Hemodialysis significantly increased left ventricular contractility (elastance) compared to control and sham groups.
• Hemodialysis improved myocardial mechanical efficiency to 64% of basal levels, surpassing dopamine's effect (49%).
• Myocardial glucose uptake was enhanced with hemodialysis, with no significant differences in catecholamine concentrations or ventricular pressures.

Conclusions:

• Large-pore hemodialysis effectively enhances left ventricular contractility in endotoxin shock, comparable to dopamine.
• Hemodialysis offers a marginal improvement in myocardial glucose uptake and mechanical efficiency.
• This study suggests hemodialysis as a potential adjunctive therapy for managing cardiac dysfunction in endotoxin shock.