Coronary Microvascular Dysfunction Assessments in Myocardial Infarction With Non-Obstructive Coronary Arteries

This study examines why some people have a heart attack even though their coronary arteries are not significantly blocked — a condition called MINOCA (Myocardial Infarction with Non-Obstructive Coronary Arteries). Researchers are assessing the function of tiny blood vessels in the heart (microvascular dysfunction) to better understand the cause. You may be eligible if: - You are 19 years or older - You have had an acute heart attack (confirmed by troponin levels and symptoms) - Your coronary arteries show less than 50% blockage, or your fractional flow reserve (FFR) is above 0.80 - You have no previous history of coronary artery disease - You underwent invasive coronary angiography within 24 hours of arrival You may NOT be eligible if: - Your coronary arteries are significantly blocked - Your condition is explained by another cause (sepsis, pulmonary embolism, myocarditis, Takotsubo syndrome, spontaneous coronary dissection) - You are in cardiogenic shock or cardiac arrest - You have serious non-cardiac conditions with a life expectancy under 1 year - You are pregnant or breastfeeding - You are unable to give consent Talk to your doctor to see if this trial is right for you.