CONGRESS ABSTRACT

Introduction
A young 17-year-old boy smoker and obese was admitted to our cardiology unit for continuous oppressive chest pain radiating to the left arm that had arisen three days earlier. In the emergency room, he had performed blood tests with evidence of an increased troponin and an electrocardiogram that showed mild ST-elevation in inferior leads with ST depression in aVL. We performed an urgent transthoracic echocardiography examination that was unremarkable
Investigation
Once diagnosed with acute ST-segment elevation myocardial infarction, the patient underwent emergency coronary angiography. Coronary angiography highlighted an intermediate stenosis of the first branch diagonal to the proximal tract and a possible occlusion of the periapical branch of the anterior descending artery. It was decided not to perform PTCA as we could not exclude a distal coronary dissection and considering the vessel was of small caliber. We decided to complete the diagnostic process by performing a cardiac MRI showing edema in the apex and distal inferior wall and transmural gadolinium enhancement at the level of the septum and inferior wall of the distal section. In the context of the damaged wall a focal area of hypointensity to be referred to the ‘no-reflow’ phenomenon
Management
The patient was treated with DAPT, low molecular weight heparin and high dose statin. A few hours after the coronary angiography the patient stopped having chest pain and remained asymptomatic for the rest of the hospital stay. We performed complete blood tests including with evidence of hyperhomocysteinemia. The lipid panel was normal. Hematological consultation recommended folate and Vitamine B12 treatment. After 12 months the patient is asymptomatic, has stopped smoking and continues to take DAPT. He repeated the echocardiogram which showed no alterations. Genetic testing was performed after hospital discharge and was positive for Methylenetetrahydrofolate reductase (MTHFR) homozygous mutation
Conclusion
Our clinical case shows a rare case of acute myocardial infarction in a very young person. Diagnosis and treatment were complicated by the extreme distality of the occlusion and the few modifiable risk factors identified (smoker, obesity and hyperhomocysteinemia). Hyperhomocysteinemia is an often underestimated cardiovascular risk factor associated with a high risk of cardiovascular events and multivessel coronary disease that should be sought in all young patients with AMI