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Myocardial dysfunction in endotoxin- and E. coli-induced shock: pathophysiological mechanisms.
Circulatory Shock
|January 1, 1985
Summary
Septic shock causes severe myocardial dysfunction in humans, confirmed by isolated heart studies. While not caused by myocardial depressant factor, this heart failure is treatable with digoxin or insulin.
Area of Science:
- Cardiology
- Pathophysiology
- Septic Shock Research
Background:
- Myocardial dysfunction is a known complication of endotoxin exposure and E. coli infections.
- Previous experimental studies indicated heart dysfunction occurs 3-6 hours post-endotoxin exposure.
- This study confirms myocardial dysfunction in human septic shock patients.
Purpose of the Study:
- To confirm and assess the severity of myocardial dysfunction in human septic shock.
- To investigate potential causes of myocardial dysfunction, including myocardial depressant factor (MDF).
- To explore reversibility of myocardial dysfunction and contributing factors.
Main Methods:
- Utilized a "Hinshaw-modified" isolated working left ventricle preparation.
- Assessed heart function in animals subjected to endotoxin shock and splanchnic arterial occlusion.
- Investigated the role of myocardial depressant factor (MDF) by using pancreatectomized animals.
Main Results:
- Septic shock induces severe myocardial dysfunction, partially reversible with adrenergic agents but fully reversible with digoxin or insulin.
- Evidence suggests myocardial depressant factor (MDF) is not the primary cause of failure.
- Hypotension, non-uniform myocardial perfusion, and altered cardiac responsiveness are implicated.
Conclusions:
- Myocardial dysfunction in septic shock is severe but potentially reversible with specific therapies.
- Further research into steroid/antibiotic therapy's effect on myocardial function is warranted.
- Identifying the exact cause of myocardial dysfunction is crucial for improving septic shock outcomes.