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Changes in myocardial energy metabolism in elective coronary angioplasty
K Peuhkurinen1, M Ikäheimo, J Airaksinen
1Department of Internal Medicine, Oulu University Central Hospital, Finland.
Insights
Coronary angioplasty is safe for myocardial energy metabolism in heart disease patients. The procedure showed transient changes in lactate but no persistent issues, indicating safety and potential substrate utilization improvements.
Area of Science:
- Cardiology
- Cardiovascular Physiology
- Interventional Cardiology
Background:
- Coronary artery disease (CAD) necessitates interventions like angioplasty.
- Understanding the impact of angioplasty on myocardial energy metabolism is crucial for patient safety.
Purpose of the Study:
- To investigate the effects of coronary angioplasty on myocardial energy metabolism.
- To assess the safety of coronary angioplasty in patients with coronary heart disease.
Main Methods:
- 14 patients with CAD underwent elective coronary angioplasty.
- Arteriovenous differences in substrates, pH, PCO2, and adenosine catabolites were measured from femoral artery and coronary sinus blood samples before, during, and after balloon inflation.
Main Results:
- During balloon inflation, lactate extraction reversed, indicating transient ischemia (p<0.02).
- pH and PCO2 differences also changed transiently (p<0.01).
- Myocardial glucose and free fatty acid utilization improved, and adenosine metabolite efflux remained negligible, suggesting preserved energy state.
Conclusions:
- Elective coronary angioplasty does not cause persistent myocardial metabolic derangements.
- Lactate is a sensitive marker for short-term ischemia during angioplasty.
- The procedure is safe and may enhance myocardial substrate utilization.
Study Objective:
The aim was to investigate the effect of coronary angioplasty on myocardial energy metabolism, and to assure the safety of the procedure in patients with coronary heart disease.
Design:
Before angioplasty a catheter was introduced into the coronary sinus. Blood samples were taken simultaneously from femoral artery and coronary sinus before balloon inflation, upon balloon deflation, and two minutes later, and arteriovenous differences in myocardial substrates, pH, PCO2, oxygen saturation, and adenosine catabolites were determined.
Patients:
14 patients with angiographically documented coronary artery disease with lesions in the left coronary artery suitable for elective coronary angioplasty were included in the study.
Results:
During balloon inflation the positive femoroarterial-coronary sinus difference of lactate turned negative, from 0.21(SEM 0.05) mM to -0.10(0.11)mM, p less than 0.02. At the same time pH and PCO2 differences increased: from 0.04(0.00) U to 0.07(0.01) U, p less than 0.01, and from -1.15(0.10) kPa to -1.41(0.10) kPa, p less than 0.01, respectively. The changes were, however, transient and the arteriovenous differences in these metabolic variables rapidly returned towards preinflation levels after balloon deflation. The femoroarterial-coronary sinus concentration differences in glucose and free fatty acids became positive in coronary angioplasty. The energy state remained good during the procedure as assessed from the negligible net efflux of adenosine and its degradation products.
Conclusions:
Elective coronary angioplasty can be performed without any persistent derangements in myocardial metabolism, and may in fact lead to improvement of utilisation of some myocardial substrates. Lactate appears to be a more sensitive indicator of short term ischaemia than adenosine degradation products.