In up to 14% of cases of acute coronary syndrome (with either elevated or non-elevated ST), contemporary high-resolution digital angiography does not identify obstructive coronary artery disease, with visually estimated % diameter stenosis (DS) of pictured lesions of < 50%. Interestingly, a novel pathophysiological concept of acute coronary syndrome in the course of non-obstructive coronary artery disease has been introduced recently (myocardial infarction with non-obstructive coronary arteries – MINOCA). We present a 52-year-old male smoker, who was admitted after sudden cardiac arrest following ventricular fibrillation. Remarkably, the patient had a history of anterior ST elevation myocardial infarction (STEMI) 2 years earlier, with insignificant stenosis (DS of ~40%) of a proximal left anterior descending artery (LAD), and no other coronary lesions (Figure 1 A). Transthoracic echocardiography (TTE) performed at that time showed left ventricular ejection fraction (LVEF) of 35%, which increased subsequently, and the patient was discharged without pathological Q waves in his electrocardiogram (ECG). Of note, at that time the patient was unconscious, in cardiogenic shock. Intravascular therapeutic hypothermia was initiated immediately. Current ECG showed a negative T-wave in leads V1–V6, typical for left ventricular (LV) acute ischemia and also for acute pulmonary embolism (PE). Current TTE revealed global LV hypokinesia (LVEF of 40%) and normal right ventricle function with its correct contractility and normal intra-cavity pressure. Thus, emergent coronarography was performed as a first line intervention, prior to eventual pulmonary artery angio-computed tomography (CT). Surprisingly, the situation had not changed for 2 years, with current angiography revealing again non-obstructive proximal LAD stenosis with DS of ~40% (Figure 1 B). Interestingly, during early cardiac rehabilitation, typical angina symptoms occurred. Therefore, further invasive evaluation of the proximal LAD was made, with a minimal index of fractional flow reserve (FFR) measured distally of 0.77, classifying the angiographically non-obstructive lesion as physiologically significant (Figure 1, pressure waves). Consequently, two drug-eluting stents were implanted. Significant LV contractility improvement was observed and the patient’s subsequent recovery was uneventful. The presented case illustrates the clinical usefulness of FFR, extending its recognized indications to the group of...


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