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Updated: Aug 15, 2026
Postconditioning with Lactate-enriched Blood for Cardioprotection in ST-segment Elevation Myocardial Infarction
Published on: May 28, 2019
Hypercholesterolemia attenuates the anti-ischemic effect of preconditioning during coronary angioplasty
Imre Ungi1, Tamás Ungi, Zoltán Ruzsa
1Second Department of Internal Medicine and Cardiology Center, University of Szeged, Hungary.
Insights
Hypercholesterolemia impairs the heart's ability to protect itself from ischemia. This study shows that high cholesterol levels reduce the effectiveness of preconditioning, a protective response, in human patients undergoing coronary angioplasty.
Area of Science:
- Cardiology
- Physiology
Background:
- Preconditioning offers cardioprotection, but its efficacy is limited in hypercholesterolemia models.
- Ischemic preconditioning via coronary angioplasty was investigated in human patients.
Purpose of the Study:
- To evaluate the impact of hypercholesterolemia on ischemic preconditioning in humans.
- To compare the effects of repeated coronary occlusions in hypercholesterolemic versus normocholesterolemic patients.
Main Methods:
- Thirty coronary disease patients were divided into normocholesterolemic and hypercholesterolemic groups.
- Intracoronary electrocardiogram (ECG) was recorded during three 2-minute balloon inflations with 5-minute intervals.
Main Results:
- Normocholesterolemic patients showed significant attenuation of ST-segment elevation and faster normalization after repeated occlusions.
- Hypercholesterolemic patients exhibited prolonged ST-segment elevation and failed to show attenuation with repeated occlusions.
- Hypercholesterolemia accelerated ischemia evolution and delayed recovery during reperfusion.
Conclusions:
- Hypercholesterolemia significantly deteriorates the anti-ischemic effect of preconditioning in humans.
- The study highlights the detrimental role of hypercholesterolemia in myocardial ischemia and recovery.
- Findings suggest impaired cardioprotective mechanisms in hypercholesterolemic individuals.
Background:
Cardioprotection by preconditioning is limited in some animal models of hypercholesterolemia. We studied ischemic preconditioning induced by coronary angioplasty in hypercholesterolemic and normocholesterolemic patients by means of a beat-to-beat analysis of ST segments.
Methods:
Thirty coronary disease patients were classified into normocholesterolemic and hypercholesterolemic groups. Intracoronary ECG was recorded during three consecutive balloon inflations of 2-min duration with 5-min intervals.
Results:
In normocholesterolemic patients, the ST segment was continuously elevated during the occlusions and rapidly normalized after balloon deflations. Repeated occlusions significantly attenuated ST-segment elevation from 1.28 +/- 0.67 to 0.88 +/- 0.51 mV (p < 0.001) and decreased the time to normalization of ST segment. In hypercholesterolemic patients, the ST segment was rapidly elevated in the first 30 s of the first occlusion, and normalization of the ST segment was longer on the first reperfusion. However, in these patients, repeated occlusions abolished the initial elevation of the ST segment but did not attenuate maximal ST-segment elevation (1.24 +/- 1.11 mV vs 1.21 +/- 1.09 mV) and failed to decrease the time to normalization of the ST segment.
Conclusions:
Hypercholesterolemia accelerates the evolution of myocardial ischemia, delays recovery on reperfusion, and deteriorates the anti-ischemic effect of preconditioning in humans.
