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Plasma catecholamines in the acute phase of the response to myocardial infarction
Insights
Acute myocardial infarction (AMI) elevates plasma catecholamines (adrenaline, noradrenaline, dopamine), glucose, and cortisol. Higher noradrenaline correlates with infarct severity, while insulin decreases, indicating metabolic stress during heart attacks.
Area of Science:
- Cardiology
- Endocrinology
- Biochemistry
Background:
- Acute myocardial infarction (AMI) is a critical cardiovascular event.
- Understanding the acute hormonal and metabolic response to AMI is crucial for prognosis and management.
Purpose of the Study:
- To investigate plasma catecholamine, glucose, fatty acid, lactate, cortisol, and insulin levels in patients with AMI.
- To correlate these levels with infarct severity and clinical outcomes.
Main Methods:
- Measured plasma concentrations of catecholamines (adrenaline, noradrenaline, dopamine), glucose, free fatty acid, lactate, cortisol, and insulin in 48 AMI patients within 6 hours of symptom onset.
- Assessed infarct severity using the coronary prognostic index and serum lactate dehydrogenase (LDH) levels.
- Monitored for ventricular fibrillation and heart rate.
Main Results:
- All measured catecholamines were elevated in AMI patients.
- Positive correlations were found between plasma noradrenaline and infarct severity (coronary prognostic index, serum LDH).
- Plasma glucose, free fatty acid, lactate, and cortisol were elevated; insulin levels were reduced.
- Patients experiencing ventricular fibrillation had markedly elevated catecholamine levels.
Conclusions:
- Elevated plasma catecholamines and altered metabolic profiles are characteristic of acute myocardial infarction.
- Plasma noradrenaline levels may serve as a biomarker for infarct severity.
- These hormonal and metabolic changes reflect significant physiological stress during AMI.
Abstract:
Plasma catecholamine (adrenaline, noradrenaline and dopamine) concentrations have been measured in 48 patients within 6 hours of the onset of symptoms of an acute myocardial infarction. The concentrations of all three catecholamines were elevated, and there were positive correlations between plasma noradrenaline concentrations and the severity of infarct as assessed by the coronary prognostic index and serum LDH levels. Plasma glucose, free fatty acid, lactate and cortisol levels were elevated while insulin levels were reduced. The site of infarction did not influence the pattern of hormonal and metabolic responses although heart rate was significantly lower in the inferior than in the anterior infarct group. Seven patients went into ventricular fibrillation shortly (less than 1.8 h) after blood sampling. Plasma catecholamine concentrations were markedly elevated in these patients with levels similar to those previously reported after cardiac arrest.