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Acute Myocardial Infarction in Rats
Published on: February 16, 2011
Prevalence of Microvascular and Endothelial Dysfunction in the Nonculprit Territory in Patients With Acute Myocardial
Felipe Díez-Delhoyo1,2, Enrique Gutiérrez-Ibañes1,2,3, Ricardo Sanz-Ruiz1
1Department of Cardiology, Instituto de Investigación Sanitaria Gregorio Marañon, Hospital General Universitario Gregorio Marañón, Madrid, Spain (F.D.-D., E.G.-I., R.S.-R., M.E.V.-A., H.G.-S., A.R.-J., F.S., M.M.-S., J.B., J.S., J.E., F.F.-A.).
Insights
Microvascular and endothelial dysfunction are common in nonculprit arteries after ST-elevation myocardial infarction (STEMI). This study found functional abnormalities in 93% of patients, indicating a need for further investigation and treatment strategies.
Area of Science:
- Cardiology
- Vascular Biology
- Interventional Cardiology
Background:
- Multivessel disease is present in about half of ST-elevation myocardial infarction (STEMI) patients.
- The physiological state of nonculprit arteries post-STEMI remains understudied.
- Understanding nonculprit artery function is crucial for comprehensive STEMI management.
Purpose of the Study:
- To characterize coronary physiology in nonculprit arteries early after STEMI.
- To determine the prevalence of microvascular and endothelial dysfunction in these arteries.
- To assess the safety of early post-STEMI coronary function testing.
Main Methods:
- Prospective observational study of 84 STEMI patients with multivessel disease.
- Assessment of epicardial endothelial function using acetylcholine.
- Quantification of epicardial stenosis (FFR) and microvascular function (CFR, IMR).
- Evaluation of endothelium-dependent microvascular function (eCFR).
Main Results:
- Macrovascular endothelial dysfunction found in 60% of patients.
- Significant stenosis (FFR ≤0.8) in 34% of nonculprit arteries.
- Microvascular dysfunction (CFR <2 or IMR >25) present in 37% and 28% of patients, respectively.
- Microvascular endothelial dysfunction (eCFR <1.5) observed in 44% of patients.
- Overall functional abnormalities detected in 93% of patients.
- Acetylcholine administration was safe with no major complications.
Conclusions:
- Microvascular and endothelial dysfunction are highly prevalent in nonculprit arteries post-STEMI.
- Early assessment of coronary physiology in these arteries reveals widespread functional abnormalities.
- Intracoronary acetylcholine testing is safe in the early phase after STEMI in multivessel disease patients.
Background:
Approximately half of the patients presenting with ST-segment-elevation myocardial infarction (STEMI) have multivessel disease. The physiology of the nonculprit artery has not been thoroughly studied to date. We sought to characterize the coronary physiology of the nonculprit artery in the early phase after STEMI and determine the real prevalence of microvascular and endothelial dysfunction.
Methods And Results:
Patients with STEMI and another coronary artery lesion in a different territory were prospectively included in an observational single-center study. The protocol took place after revascularization of the culprit artery and comprised 3 phases: first, epicardial endothelial functional assessment using intracoronary acetylcholine; second, epicardial severity quantification based on fractional flow reserve, and nonendothelial microvascular function with coronary flow reserve and the index of microvascular resistance; third, endothelium-dependent microvascular function assessment based on the endothelial coronary flow reserve. Eighty-four patients were included. Mean age was 62±10 years, and 86.9% were men. Only 6 subjects had a nonpathological study: macrovascular endothelial dysfunction was present in 60% of the patients; fractional flow reserve ≤0.8, coronary flow reserve <2, and index of microvascular resistance >25 were evident in 34%, 37%, and 28% of the subjects respectively; and microvascular endothelial dysfunction (endothelial coronary flow reserve <1.5) was observed in 44%. In hospital-mortality was 0%, and no major complications occurred. At 6-month follow-up, there were no events related to the nonculprit artery.
Conclusions:
Microvascular and endothelial dysfunction in the nonculprit artery territory in patients with STEMI are very common. In 93% of the patients, we found functional abnormalities. Acetylcholine administration in the early phase post-STEMI in patients with multivessel disease is safe.
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