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[Effect of myocardial ischemia on adenine nucleotide metabolism]
Insights
Inosine and hypoxanthine levels correlate with heart conditions. Myocardial extraction of inosine differs between coronary heart disease and neurocirculatory dystonia, offering insights into infarction severity and prognosis.
Area of Science:
- Cardiology
- Biochemistry
Background:
- Coronary heart disease (CHD) and acute myocardial infarction (AMI) are significant cardiovascular conditions.
- Understanding metabolic markers in these conditions is crucial for diagnosis and prognosis.
Purpose of the Study:
- To investigate the correlation between inosine and hypoxanthine levels and cardiovascular diseases.
- To assess myocardial inosine extraction in patients with CHD, neurocirculatory dystonia, and AMI.
Main Methods:
- Correlation analysis of inosine and hypoxanthine concentrations in arterial and coronary sinus blood.
- Evaluation of myocardial inosine extraction under basal and ischemic conditions.
- Comparison of metabolic markers across patient groups.
Main Results:
- Significant positive linear correlations found between inosine/hypoxanthine levels and arterial/coronary sinus blood concentrations.
- Myocardial inosine extraction was higher in CHD patients initially, reduced during electrically stimulated ischemia.
- Electrostimulation did not affect inosine extraction in neurocirculatory dystonia patients.
- AMI showed increased inosine extraction and production due to adenyl nucleotide degradation.
Conclusions:
- Inosine and hypoxanthine levels in arterial blood may indicate AMI severity.
- Temporal variations in these metabolites could hold prognostic value for acute myocardial infarction.
Abstract:
Patients with coronary heart disease (CHD), neurocirculatory dystonia and acute myocardial infarction showed statistically significant, positive linear correlations between the levels of inosine and hypoxanthine as well as the total concentration in the arterial blood and the blood from the coronary sinus. The correlation analysis ascertained that CHD patients in the initial state exhibited a considerable extraction of inosine by the myocardium as compared to patients with neurocirculatory dystonia and that in electrically stimulated ischemia it was sharply reduced. Electrostimulation in the group of patients with neurocirculatory dystonia had no effect on the rate of inosine extraction. Acute myocardial infarction was related to a higher rate of inosine extraction and to inosine production in the myocardium, the latter being explained by the degradation of adenyl nucleotides in conditions of acute ischemia. It is outlined that the total level of inosine and hypoxanthine in the arterial blood of patients with acute myocardial infarction may indicate the severity of infarction while its variations over time may be prognostically valuable.