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[Sodium efflux through lymphocytic cell membranes in patients with acute myocardial infarction]
Insights
Lower sodium-potassium pump activity in acute myocardial infarction (AMI) patients may contribute to arrhythmias. Successful reperfusion therapy normalized sodium efflux, but not in non-reperfusion cases.
Area of Science:
- Cardiology
- Biochemistry
- Cellular Physiology
Background:
- Reduced Na(+)-K(+)-ATPase activity in acute myocardial infarction (AMI) is linked to altered intracellular ion concentrations, potentially causing ventricular arrhythmias and coronary spasms.
- The Na(+)-K(+)-ATPase is crucial for maintaining cell membrane potential and ion gradients.
Purpose of the Study:
- To investigate sodium efflux rates through the lymphocytic cell membrane in AMI patients following thrombolytic therapy.
- To assess the impact of reperfusion on sodium efflux dynamics post-thrombolysis.
Main Methods:
- Measured total, ouabain-sensitive, and furosemide-sensitive sodium efflux in lymphocytes from 50 AMI patients and 31 healthy controls.
- Evaluated efflux rates before, and 3 and 5 days after thrombolytic therapy (alteplase), differentiating between reperfusion and non-reperfusion groups.
- Utilized the Haegerty et al. method for sodium efflux measurement.
Main Results:
- Patients with AMI exhibited decreased total and ouabain-sensitive sodium efflux, with normal furosemide-sensitive efflux.
- In AMI patients who underwent successful reperfusion, sodium efflux rates normalized within 3-5 days post-thrombolysis.
- Patients without reperfusion showed persistent decreases in sodium efflux rates.
Conclusions:
- Decreased sodium efflux is a characteristic of AMI, potentially related to Na(+)-K(+)-ATPase dysfunction.
- Successful thrombolytic therapy and reperfusion restore normal sodium efflux in AMI patients.
- Lymphocytic sodium efflux serves as a potential indicator of reperfusion success in acute myocardial infarction.
Abstract:
One of the reasons of ventricular arrhythmias and coronary artery spasms in patients with acute myocardial infarction (AMI) may be the lower Na(+)-K(+)-ATPase activity, which causes decrease of potassium intracellular concentration and increase of calcium intracellular concentration. The aim of the study was the examination of the rate of sodium efflux through the lymphocytic cell membrane in patients with AMI after thrombolytic therapy. The survey was made in 50 patients with AMI after thrombolytic therapy: 30 of them with reperfusion (group I) and 20 without reperfusion (group II). The control group consisted of 31 healthy persons. Rates of total, ouabain-sensitive and furosemide-sensitive sodium efflux through the lymphocytic cell membrane were measured before thrombolysis, then 3 and 5 days after, using the method elaborated by Haegerty et al. All patients were treated with aspirin, glyceryl trinitrate and thrombolysis therapy with alteplase (r-TPA). In all patients with AMI rates of total and ouabaine-sensitive sodium efflux through the lymphocytic cell membrane were decreased, but rates of furosemide-sensitive sodium efflux were normal. In patients after thrombolytic therapy with reperfusion, 3 and 5 days after thrombolysis the decreased rates were normal, but they were still decreased in patients without reperfusion.