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Preservation of myocardial contractility in hemorrhagic shock with methylprednisolone
Insights
Methylprednisolone protects the heart during hemorrhagic shock. Intracoronary infusion significantly improved myocardial function and recovery compared to controls.
Area of Science:
- Cardiology
- Pharmacology
- Physiology
Background:
- Hemorrhagic shock can lead to significant myocardial dysfunction.
- Assessing protective agents for the heart during shock is crucial.
Purpose of the Study:
- To evaluate the cardioprotective effects of methylprednisolone in a canine model of hemorrhagic shock.
Main Methods:
- Selective intracoronary infusion of methylprednisolone (1 mg/kg) into coronary arteries of dogs.
- Induction of 90-minute hemorrhagic shock followed by retransfusion.
- Continuous monitoring of electrocardiogram, blood pressure, and myocardial contractile force.
Main Results:
- Pretreated areas showed twice the contractile force compared to control areas during shock.
- Post-transfusion, pretreated areas exceeded preshock contractile force.
- Control areas only recovered to 70% of preshock contractile force.
Conclusions:
- Intracoronary methylprednisolone provides significant myocardial protection during hemorrhagic shock.
- Methylprednisolone enhances recovery of cardiac function after shock.
Abstract:
The left anterior descending or left circumflex coronary artery was cannulated selectively in 10 dogs. Methylprednisolone, 1 mg per kilogram of body weight, was injected into the artery and the cannula was withdrawn. The animals were then subjected to hemorrhagic shock for 90 minutes. Retransfusion to prestudy blood pressure was then accomplished. The electrocardiogram, arterial blood pressure, contractile force, and first derivative of contractile force were recorded continously both from the areas that were pretreated and those that were not, the controls. Contractile force in the control area was reduced to 32 +/- 3.2% of the preshock period after 90 minutes of shock, whereas in the pretreated area it was twice as high at the same time. Ten minutes after transfusion, the contractile force of the pretreated area exceeded the preshock level, whereas the recovery of contractile force in the control area reached only 70% of the preshock level. This study shows that intracoronary infusion of methylpredisolone can afford myocardial protection in hemorrhagic shock to a significant degree.